Maximum Span Of Concrete Slab

The wheel contact area on the slab is estimated at 60 sq in. Laminated timber 5. , perpendicular also to a free edge. Advantages and Disadvantages of Flat Slabs - Civil Engineering. Incremental Slab Deflection < Span/500 3. the North Carolina Building Code Council. Slabs in which the deflected surface is predominantly cylindrical is called one-way slabs spanning in the direction of curvature. Determine suitable dimensions for the effective depth and width of the beam. Checking slab deflection is included in the beam design section of BS 8110 Part 01. Assuming suitable bearings (not less than 10cm), find the span of the slab between the centers of bearings. We therefore do not recommend spans greater than the following: 150mm planks — 7. Reinforcement details of concrete beams and slabs should specify clearly about cover to reinforcement, length of reinforcement, curtailment of reinforcement, number and diameter of reinforcement to be provided. The design of long span steel and (steel-concrete) composite beams is generally carried out in accordance with BS 5950, BS EN 1993 or BS EN 1994. Prepared for the. The dimensional properties and strengthening rebar arrangements of the tested beams are summarized in Table 1 and Figure 1. Design the slab following the provisions of the ACI code. A DOUBLEspan has 3 permanent. Spanwright UK are a leading manufacturer of precast concrete solutions for UK and Irish Construction Projects. A typical 1. slab and beam dimensions and concrete cover. Cover is determined from the requirements for corrosion protection, fire protection, and wear. Tech students. , interior beam dimensions = 14 in. 1 from CRSI provides LRFD analysis of cast-in-place rein-forced concrete slab bridge designs. At the moment. 11 Strands ( soil = 125. These are investigated from practical and theoretical points of view and serious problems found. Load chara c t e r istics must obv i - ously va r y with the decking configu-rations and thickness, span re i n f o r cement, concrete stre n g t h and concrete thickness. 2L for drop panel haunches. 6 8 give recommendations and requirements. Our partner, Bradford Buildings, is also a Board Member with the NFBA. The Post-Tensioning Institute (PTI) Design Manual6 gives recommended span-to-thickness ratios for slabs and span-to-depth ratios for beams. 5m 3 (2 cu yd) of concrete from 1. span / depth ration: L/50 L/50 L/50 L/50 Pre-stressing strand type: Suggested bearings: 120mm 150mm 200mm 250mm Slab only 240 275 329 386 Slab and joint 255 292 351 411 Slab, joint and 30mm levelling screed. G et al in 2015, studied the effect of a skew angle on single-span reinforced concrete bridges and PSC. I does not need to be a icf roof. The minimum spacing is the maximum of 1 in, a bar diameter, or 1. It is backed by site-based research. LowSpan is a prestressed top slab, reinforced precast 3 sided culvert, bridge or tunnel. To save on beam disruption, PT slabs are widely used instead of regular bed and columns. 7 kPa) LL = 40 and 50 psf (1. Incremental Slab Deflection < Span/500 3. Products and services for the building industry. Box 12100, FI-00076 AALTO www. The choice of unshored systems is very common because these systems can save construction cost. 5% of each adjacent span. or even heating conduits can be previously installed in the solid slab in the precasting plant. Prestressing provides for longer span lengths and shallower rise heights creating maximum hydraulic efficiency. in the Design Guide for Long-Span Concrete Floors15. Due to problems with the data acquisition system, the strains in the SL04S were not measured. And if the lookee loo doesn't give any confidence, bring in a larger diameter drill and drill under each (planned) pressure point, and expect to excavate a few feet to install your better fill (and a thicker concrete pad). To form this type of slab requires temporary beams, columns, and plywood as floor supports for the concrete. However, recently there is a preference for large floor areas with column-free space and spans. Span Standard: Change slab and slab overhang thickness dimension to 8 ½". Spacer bars in Beams and Reinforcement in Slab Spacer bars in Beams Where there are two or more rows of bars, the bars shall be vertically in line and the minimum vertical distance between the bars shall be 15 mm, two-thirds the nominal maximum size of coarse aggregate or the maximum size of bar whichever is the greatest. Temporary Propping Decking is usually designed un-propped, however for longer or single span locations (i. and 3000 psi concrete. With this strengthening method it is possible to transfer the loads from the span of the slab directly to the column through the tendons, so that the undesirable. For precast box culverts, the design earth cover shall be reported as the elevation difference between the point of maximum fill and the top of the top slab. It is not uncommon to see a theoretical tendon path falling outside of the slab at the fold – clearly a situation to be avoided. For spans over 9 m post-tensioning should be considered. com - id: 6eedf5-MDQwM. introduction of ECC to link slab construction is proposed for its ability to control crack widths and its processing flexibility. Ignoring the effect of slab folds on tendon profile. Maximum span/depth ratios of 40 are recommended for floors. Each single slabs are referred to as panels, if the slab is continuous over supports. Concrete quality shall be F'c = 32 Mpa, maximum aggregate size 20 mm , slump 80 mm. Thickness Estimation:. (For more information on anchorage of braced walls to slab-on-grade construction, see Chapter 3 of this guide. View Composite Deck information. I'd recommend going with a thicker (5" or 6") floor slab, plus grouting and reinforcing the cells in the CMU, then tying the walls and floor together with bent rebar; this can be done by you and your friends. They are either one-way spanning systems known as ribbed slab or a two-way ribbed system known as a waffle slab. Description. 2x 1 where x = distance of load-from support closest to load I = effective span. 5mm foreconomic solutions – Efficient concrete cross section using up to 31% less concrete than other decks. Here ratio of longer span of slab to the shorter span of slab is greater than 2. Change slab top clear cover to 2 ½". Cover is determined from the requirements for corrosion protection, fire protection, and wear. Modification in Grid Slab for Utility Lens lights –to provide diffused daylight through concrete roofs. Minimum bar spacings are specified to allow proper consolidation of concrete around the reinforcement. 3 Three Span Beam Analysis 65 3. DIMITAR DIMITROV 6 lcl - Clear span leff - Effective span lnom - Span between axes of the supports lmax,cl - Maximum clear span of a slab lmin,cl - Minimum clear span of a slab 1/r - Curvature at a section s- Distance between reinforcing bars or stirrups. DIMITAR DIMITROV 6 lcl – Clear span leff – Effective span lnom – Span between axes of the supports lmax,cl – Maximum clear span of a slab lmin,cl – Minimum clear span of a slab 1/r – Curvature at a section s- Distance between reinforcing bars or stirrups. For design purposes, it is usual to take into account ap-. Tech students. substitute to steel reinforcement in concrete. Joints should be spaced about 10 feet and a maximum of 15 feet. Please Contact Us is you require specific information regarding your project. A DOUBLEspan has 3 permanent. HPD, ASD & LRFD and LS used as concrete form 80 Concrete Volumes and Slab Design Data 81 Concrete Slabs on Form Deck 82 - 83 UFS, UF1X, UFX, UF2X Maximum Span and Cantilever Tables 84 Slab and Reinforcement Data 85 Fire Resistance Ratings 86 SDI Long Form Specifications 87 - 91 Introduction 92 Diaphragm Design Example 93 Typical Fastener Layout 94. In this case the moment steel is placed in the slab bottom and extends across the entire slab length. Based on the analysis and at this specified value, a deflection of L /960 – which indicates a stiff building – will probably result in a reduction in F F no greater than about 10 percent. If the stress exceeds a certain amount then a crack will start in the bottom and the crack will travel through the slab. Span-to-depth ratio vs. STRENGTH OF CONCRETE IRC change - Add foot F dealing with garage slab applications which is a (reduction of the total air content (percent by volume of concrete) to not less than 3 percent is permitted if the compressive strength of the concrete is increased to not less than 4,000 psi. Wide slabs load span tables. (6,100 mm) 10 in. 2x 1 where x = distance of load-from support closest to load I = effective span. 10 m were researched experimentally. This should be the maximum span that the assembly will be subjected to, and it will determine the size of the assembly needed. 2 Effective span The continuous slab is designed as a series of simply- supported spans, for simplicity. For slabs over 10m, ratios should be reduced by the factor √(10/span in metres). One-way slabs:. (75 to 100 mm) Typical load DL = 67 to 78 psf (3. Along the length of the link slab, the bottom elements of link slab 2 were in tension. One can use beams of size 9″ X 12″ (225 MM x 300MM) with a slab thickness of 5″ (125 MM) cast in M20 concrete for spans up to 5m. The load capacity is a function. The diaphragm design is outside the scope of the course. The Romans used concrete extensively from 300 BC to 476 AD, a span of more than seven hundred years. 5m is commonly used) and the minimum total depth of slab is limited by 20cm. Although these may seem somewhat unexciting structures, and would also appear to be very simple to assess, short-span concrete slab bridges have in fact created significant problems in the current bridge assessment programme. Manufacturing processes may vary according to the design and purpose of the flooring required. The slab bottom (soffit) has a parabolic profile with minimum depth at mid-span and maximum depth at pier. Deflection of two way slab could be calculated by using available. The points do not necessarily coincide with the location of supports below the floor slab. LONG SPAN SLABS As a result of the apartment layout, the typical one way slab span of the structure is 20 feet. Long Span Steptreads by Stepstone, Inc, a manufacturer of Precast Concrete Steptreads, Stair Treads and Steps for National Distribution. Slabs in which the deflected surface is predominantly cylindrical is called one-way slabs spanning in the direction of curvature. The above self weights of the various slab depths are 30% lighter than an in-situ slab of a similar depth. • Integrated IFB beams with under-tied hollow sections to create a span of 12,5 m, which is 30% larger than is possible with integrated beams. (75 to 100 mm) Typical load DL = 67 to 78 psf (3. Building a 25 sq. , perpendicular also to a free edge. the design of bridge decks in Nevada. COMPOSITE BEAMS - I COMPOSITE BEAMS – I 21 1. Stronger, more efficient floor slab design creates longer spans and reduces the need for columns within the structure. Post-tensioned concrete has pre-compression loads applied to the concrete, which ensures any deflections in the slab can be eliminated by good design practices. Only the concrete slab was modeled and the reinforcing steel was ignored. 9 Thermal strain. Becker Computerized Structural Design, S. The unsupported distance of the front is approx. Below are the types of concrete slabs. ASSIGNMENT 2 Section A-Reinforced Concrete QUESTION 1 Figure Q1, shows a simply supported two-way spanning slab. Spanwright UK are a leading manufacturer of precast concrete solutions for UK and Irish Construction Projects. Based on my experience, slab thickness made of concrete varies from 100mm to 200mm thickness. The cost function represents the cost of concrete, steel reinforcement and formwork. • The slab is cast-in-place and water cured. Large maximum sizes of aggregates produce less voids than smaller sizes. DIMITAR DIMITROV 6 lcl - Clear span leff - Effective span lnom - Span between axes of the supports lmax,cl - Maximum clear span of a slab lmin,cl - Minimum clear span of a slab 1/r - Curvature at a section s- Distance between reinforcing bars or stirrups. DIVISION 03 - CONCRETE SECTION 03 41 16. Assakkaf CHAPTER 9a. Except as specifically required by this Standard, ACI 318 shall not be applicable to the. CONCRETE DECK SLAB INTRODUCTION - CHAPTER 10 PART 2 DATE: 31Oct2018 SHEET 1 of 1 FILE NO. 2x 1 where x = distance of load-from support closest to load I = effective span. Designer Notes - Composite Slabs June 2019 Material Properties 1. reinforced concrete slab on ground is limited to a maximum of 24 m in any direction. You'll find a beam span calculator towards the bottom of this page. 1R-06 follow a format similar to that of ACI 318-05. LRFD Deck Slab Design Procedure, Equations, and Outline Design Stresses f'c = 4. under same imposed loads and take a half span of the precast slabs due to the symmetric in the adjacent precast span of the slabs. When concrete reaches its maximum strain at the same time as the steel reach is yielding stress, it is called a balance condition. Get this from a library! Economics of long-span concrete slab systems for office buildings : a survey. Assuming suitable bearings (not less than 10cm), find the span of the slab between the centers of bearings. Voided slab and beam and slab bridges are used for larger, single or multi-span bridges. See page 23. Since the calculated tensile stress is less than the allowable, the design meets the code criteria. Square or round glass blocks or lenses those are cast into reinforced concrete ribs. During the Roman Empire, Roman concrete (or opus caementicium) was made from quicklime, pozzolana and an aggregate of pumice. The parameters investigated in this analytical study were the span length, slab width, and skew angle. Maximum span/depth ratios of 45 are recommended for floors. 787 inches lLoad Tables - Both the strength and deflection criteria were. Except as specifically required by this Standard, ACI 318 shall not be applicable to the. 5(b) of ACI gives the maximum permissible computed deflections. Clemson University 2. supporting slabs or beams may be designed for mid-span design moment of wl2/10 and hogging moment at the supports of the same value. All metal (e. Reinforced Concrete Design to BS8110 Structural Design 1 - Lesson 5 5 4. Principal tension stresses change direction from horizontal at the longitudinal reinforcement to 45o at the neutral axis and vertical at the location of maximum compression stress. 33 times the maximum aggregate size. Concrete quantities are based on headwalls without the 6" extension under the Use 4000 psi compressive strength concrete for headwalls. Design of One Way & Two Way Slabs One Way Slab: If slab span in one direction (shorter one) only for a large part of the slab when l y /l x > 2 it is termed as one way slab. The design did not lead to cracking due to moments about X-X direction. The supports do not have adequate provision to resist torsion at the comers and to prevent the corners from lifting. (ii) In case 2, where no composite action is assumed at the ultimate limit state and the slab is fully reinforced, the span to depth ratio should not exceed 30, up to a maximum span of 6m (ie using a slab depth of 200mm). Design the slab following the provisions of the ACI code. Originally the concrete slab bridge only spanned 5 to 20 feet, but by 1938, slab bridges were built to a maximum of 25 feet. 2) b) There must be three or more continuous spans in each direction; (ACI 318, Section 13. 4 for reinforcing steel, whichever is greater. under the load of wet concrete does not exceed 30 mm and a span to depth ratio of 30 for single spans and a ratio of 35 for continuous spans. If the stress exceeds a certain amount then a crack will start in the bottom and the crack will travel through the slab. I'd recommend going with a thicker (5" or 6") floor slab, plus grouting and reinforcing the cells in the CMU, then tying the walls and floor together with bent rebar; this can be done by you and your friends. The length of false-work or the maximum distance separating the straining pieces was. 5-inch slab thickness plus the thickness of the rib) are shown in Table 2. The units themselves are manufactured at a width of 1200mm and depths of 150, 200, 250, and 300mm. A reinforced concrete slab is built integrally with its supports and consists of equal span of 15 ft. The Concrete Society publication: TR58: Deflections in concrete slabs and beams, 2005, or How to design concrete structures using Eurocode 2: Deflection Calculations. 2 DEFINE STEEL REINFORCEMENT Double click Bar Mark Definitions. 5) Slab Design 103. This slab design can only work for a slab clear span of 14 feet which is only good for one car garage, 2 cars if parked behind the other, not side by side. 6m for two-way slabs and to 12. rebar, the maximum positive moment supported by the precast slab or the bearing beam was directly obtained by multiplying the maximum axis by the mechanical leverage, which practically corresponds to the height of the lattice. shore support is required at mid-span in each span. CIP 16 - Flexural Strength Concrete WHAT is Flexural Strength? Flexural strength is one measure of the tensile strength of concrete. Two Way Beam Supported Slab References: 1. 0 x 106 pounds per square inch) 257. Hollowcore Load Span Table. The maximum skew angle for decked slab beam bridges is 30°. The reduced weight also lowers material and transportation costs. LYSAGHT® BONDEK®II FORMWORK/SLAB SPAN TABLES Maximum slab spans, mm Maximum slab spans, mm NOTES: 1. Square or round glass blocks or lenses those are cast into reinforced concrete ribs. Bottom of slab elevations shown on the plans are set higher than the actual. It is a measure of an unreinforced con-crete beam or slab to resist failure in bending. Standard load capacities of Surefoot’s pile used in the Surepanel system range from 160kn to 360kn. The maximum longitudinal stresses along the length of the link slabs for the bottom elements were 0. elevation at bottom of the top slab. Note: The shear area of concrete is entered as input to some computer programs when the analysis is required to take into account the deformations due to shear. Knowing the load-bearing capacity of your concrete is essential to make sure that what you plan to have supported by the wall or slab will not be too heavy and cause it to crack and break. The load / span chart below clearly shows the maximum span for the required loading using either aerated, medium or high density infill blocks and 65mm screed. Loads used in computations are Dead Load (Weight of slab) and 2550 kg/m3 DL (Concrete & Reinforcement) 4. In one way slab, major reinforcement is along the side of smaller direction and the reinforcement along the side of longer direction is known as distribution steel. The use of Precast Concrete Hollowcore Flooring is a highly cost effective solution that fits easily into any structural system such as steel or concrete frame or indeed masonry construction. A reinforced concrete slab is built integrally with its supports and consists of equal span of 15 ft. 1 Precast Concrete Roof Slabs 2. stresses at the bottom of the slab/column joint, where there is typically little or no rebar, or it can actually lift up the slab. The minimum area of principal reinforcement is A s,min = 0. the design of bridge decks in Nevada. CON4332 REINFORCED CONCRETE DESIGN Chapter 5 3 HD in Civil Engineering (Aug 2014) Figure 5. 5-inch slab thickness plus the thickness of the rib) are shown in Table 2. (6,100 mm) 10 in. Available in Earthly colours, Sandstone, Plum, charcoal, Grey, Exposed Aggregate Finish and Smooth Finish. design of reinforced concrete waffle slabs is sought using the simple genetic algorithm. A good compromise is 3500 to 4000psi, maximum 3 inch slump mix. Maximum span/depth ratios of 45 are recommended for floors. The use of larger joints requires approval of the D. Coupler size usually dictates location at mid-depth of concrete in slabs, this constrains them close to quarter span of slab. The 190 kips shipping weight limit corresponds to 175 foot WF83G prestressed concrete girders that have been comfortably shipped in the last few years. (75 to 100 mm) Typical load DL = 67 to 78 psf (3. Slab Reinforcement Provided by the General Contractor, the slab reinforce-ment typically consists of 6x6 welded steel wire or fiber mesh. Span and load requirements determine the member thickness and the amount of prestressing force. Hollowcore is an extruded, prestressed concrete slab with continuous voids to reduce weight and cost. In this investigation, the general FEA programme ANSYS rel. Products and services for the building industry. Span Standard: Change slab and slab overhang thickness dimension to 8 ½". Assakkaf CHAPTER 9a. SITECAST CONCRETE ONE-WAY SOLID SLAB SITECAST CONCRETE. Moment steel distribution above columns 6. Tabulated formulas that recommend minimum slab thickness based on span are found in the Concrete Design section of the Specifications. Design of composite slab, slab capacity and long term deflection calculation need to be car ried out by a qualified structural engineer. Strength of Concrete Pacific NW aggregates have consistently resulted in concrete strengths, which may. 0 kN/m2 and a characteristic dead load of 1. 19 July 2019 5. Our technical department will be able to advise you on the most economic unit for your specific condition. 4 l (test setup), the value of β a is 1/10. 5-inch slab thickness plus the thickness of the rib) are shown in Table 2. 6 8 give recommendations and requirements. 0 5SB12 30 40 18. 80 width of supporting beam b support 14 in yield strength of reinforcement f y 60,000 psi clear span L n 16. The maximum permissible time for holding tensioned strands in the bed before placing concrete is 72 hours. • Under floor services Services are easy to attach to MetFloor® 55, with the ribs presenting a dovetailed recessed groove in the concrete slab at 150mm. Steps to be followed in the design of slab. 3-1 are guidelines but are not required. One 8" vertical support dead center will leave two 36" spans. usually slabs • When shear reinforcement isrequired e. The thickness of the slab without drop panels may not be less than 5 in. After three days, the concrete will be strong enough to allow further construction on the building. and 3000 psi concrete. pended elevated flat slab 42. Deck Properties - Material Type. Based on the analysis and at this specified value, a deflection of L /960 – which indicates a stiff building – will probably result in a reduction in F F no greater than about 10 percent. stresses at the bottom of the slab/column joint, where there is typically little or no rebar, or it can actually lift up the slab. Ignoring the effect of slab folds on tendon profile. compressive strength of concrete f'c 5,000 psi span length of slab (beam spacing L 18 ft center to center coefficient for depth of stress block 1 0. For f y between the values given in the table, minimum thickness is determined by linear. For precast box culverts, the design earth cover shall be reported as the elevation difference between the point of maximum fill and the top of the top slab. rebar, the maximum positive moment supported by the precast slab or the bearing beam was directly obtained by multiplying the maximum axis by the mechanical leverage, which practically corresponds to the height of the lattice. ACI 318 CODE PROVISIONS FOR DEFLECTION CONTROL OF TWO-WAY CONCRETE SLABS. Detail 21 shows a suspended slab with no beam. And Columns are not offset by more than 10% of the span in the direction of the offset. Minimum thickness for two way slab construction designed as per methods provided by ACI 318-11 Code namely, direct design method and equivalent frame method. Cornell University,. A concrete topping is not required for the 2 hour unrestrained rating. Design the slab following the provisions of the ACI code. Slab thickness is 20cm. What is the maximum span of a concrete slab as a foundation for a deck and should it be epoxied or bolted down? You can set the joist directly into a 3 or 4 foot hole filled with concrete. The slabs possessing ratio of longer length to its smaller length (Ly/Lx) higher than 2 is known as one way slab or else as two way slab. Slabs are usually used in floor and roof construction. For a 30" depth, 2" is about the norm. Please Contact Us is you require specific information regarding your project. Span-to-depth ratio vs. (ii) In case 2, where no composite action is assumed at the ultimate limit state and the slab is fully reinforced, the span to depth ratio should not exceed 30, up to a maximum span of 6m (ie using a slab depth of 200mm). A 1-1/8" concrete topping is required for the 3 hour restrained rating. Prestressing provides for longer span lengths and shallower rise heights creating maximum hydraulic efficiency. Span-by-span. The number of construction joints in concrete structures should be minimized. inches (76. I am designing a concrete roof slab that span across 12m long and 9m width for my living area. It is a measure of the maximum stress on the tension face of an unreinforced concrete beam or slab at the point of failure in bending. 5(c) of ACI gives the minimum thickness of slabs without interior beams. We specialise in the design, manufacture, supply and installation of precast concrete flooring, concrete stairs, agricultural precast and bespoke concrete solutions. 2 SUBMITTALS PART 2 PRODUCTS 2. A flat slab may be solid slab or may have recesses formed on the soffit so that the sof fit comprises a series of ribs in two directions. Design calculation Design of one way slab Slab S1 Span of One way slab L = 2m Section provided D = 130 mm d = 105 mm Loads on slab Self weight of slab = 3. In other words, subtracting this cover dimension from the slab or beam thickness gives the effective depth. (114 mm, 152 mm et 190 mm) allow the deck to span longer distances between supports and achieve additional load capacity. concrete cover is required (see Table A-4. com - id: 6eedf5-MDQwM. 876 = Conversion constant. Minor arches are those whoe spans do not exceed 6’-0” and with maximum rise to span ratios of 0. 10 m were researched experimentally. Good Concrete Guide 5: Composite concrete slabs on steel decking) should be followed to avoid excessive deflection. I'm trying to figure if the cost of the foundation and concrete deck is a savings over building on a. Solution: The required thickness from Table 11. Since the calculated tensile stress is less than the allowable, the design meets the code criteria. A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. These 5 things are critical aspects of checking a suspended concrete slab. If construction joints are necessary to facilitate construction, it is normally aligned perpendicular to the direction of the member. Two-way slab is suitable and economical for the panel sizes up to 6m x 6m. Calculator works for rectangular beams, positive-moment and negative-moment T-beams, and 1-way slabs, as shown in the sections below:. The maximum distance between movement joints is in the order of 50 metres. Also on patio slabs run a thickened edge around perimeter for added strength. 6 m) in the parking structure, δ field, can be given by (2) For the case of a simply supported one-way slab under two equal concentrated loads applying at a shear span of 0. • Slab’s fire performance Heat transfer through the small dovetail into the slab is minimal resulting in a lesser slab depth for fire design. Concrete Slab Maximum Length Calculator. Cantilevers over 4m should be justified by calculation. under the load of wet concrete does not exceed 30 mm and a span to depth ratio of 30 for single spans and a ratio of 35 for continuous spans. Roof Deck - Maximum Spans NOTES: For more information regarding Canam steel deck, please refer to the Steel Deck or contact our experts by phone at 1-866-466-8769 or online. The maximum permissible time for holding tensioned strands in the bed before placing concrete is 72 hours. Floor Deck-Slabs. At the moment. The slab has a uniform. See the Cast-In-Place Concrete Slab Spans standard drawings for shear key details. ACI 318-08 requirements for slabs without interior beams or slabs with beams spa nning between supports on all four sides with α fm < 0. A rational and reliable expression for the maximum allowable span to depth ratio for beams, proposed recently by Rangan, is extended to the entire range of reinforced concrete flexural members including two-way, edge-supported 1 slabs; flat slabs; and flat plates. 40 mm 50 mm 60 mm 70 mm. Maximum test strengths were nearly 5 times greater than the 1983 ACI Building Code predicted strengths. Since the wall is free at the top and fixed at the base, the maximum moment is: 2 00920 12 2 = 12 psf ft in. CIP 16 - Flexural Strength Concrete WHAT is Flexural Strength? Flexural strength is one measure of the tensile strength of concrete. MAXIMUM CONSTRUCTION CLEAR SPANS (S. Our partner, Bradford Buildings, is also a Board Member with the NFBA. Experience with large scale concrete pours. I am designing a concrete roof slab that span across 12m long and 9m width for my living area. 3 MATERIALS 2.