Types of One way Slabs 1- One-way Solid Slab with beams. This type of slab is supported on beams. Depending on beam and column arrangements, this system can be designed for wide ranges of the load conditions. 2- One-way Ribbed Slab with beams. One-way Ribbed Slab with beams is used for the office buildings (low rise), parking structures, and ... Thickness of Slab – 150 mm ; One Way Slab Bar Bending Schedule Calculation. Step 1 . FIrst, find number of rods required for main reinforcement and distribution. Number of Required Bars Formula = (Length of slab / spacing) + 1. Number of Main Bars = Ly / spacing + 1 = (4000/150) + 1 = 27 nos We determined the weight of the Re-Bars for a one way slab in earlier post. Refer the post here : ONE WAY SLAB : REBARS Today , let us find out the cost of materials in totality. Please remember this is only the cost of materials. For finding out the complete cost of this item , we shall need to add many other elements. May 15, 2020 · Example: Generally all the Cantilever slabs are one Way slab. Chajjas and verandahs are a practical example of one way slab. Two Way Slab: Two way slab is a slab supported by beams on all the four sides and the loads are carried by the supports along with both directions, it is known as two way slab. In two way slab, the ratio of longer span (l) to shorter span (b) is less than 2. Example Two-way Slab (Panels) From the ACI Code limitation 44 Example Two-way Slab (Panels) Therefore, the panel thickness is The panel half width are at least L/6 in length. 45 Example Two-way Slab (Panels) Therefore, the drop down panel thickness is 10 in. and has 7 ft x 8 ft. 46 Example Two-way Slab (Panels) The load on the slab is given as CVEN4301 Solved example Analysis & design of one-way slabs The reinforced concrete slab shown in Figure-1 is supported on beams and joists. The slab is 150 mm thick, the beams are 400 mm wide and 600 mm deep and the joists are 300 mm wide and 500 mm deep. May 15, 2020 · SLAB: Slabs are constructed to provide flat surfaces, usually horizontal, in building floors, roofs, bridges, and other types of structures. The slab may be supported by walls, by reinforced concrete beams usually cast monolithically with the slab, by structural steel beams, by columns, or by the ground. Slabs are classified into two types: One Way […] If this value is ≥2 then the roof is designed as a one-way slab. B. Examples Of One Way Slab. The best examples are: Veranda; Car parking or garage; Long span hall; Now, lets get into the basics of two way slab. What Is Two Way Roofing? Similarly, if bending is considered to be occurring in both the directions then it is called 2 way slab. So How do you differentiate a one-way and two-way slab? Hey ! My name is SL KHAN and you are watching an Engineer boy. Slabs are basically two dimensional co... Oct 27, 2016 · In one way slab, the ratio of longer span (l) to shorter span (b) is equal or greater than 2, i.e Longer span (l)/Shorter span (b) ≥ 2 Verandah slab is a type of one way slab, where the slab is spanning in the shorter direction with main reinforcement and the distribution of reinforcement in the transverse direction. What Is Two Way Slab? Some of the prominent examples of the one-way slabs are the cantilever slabs, chajjas and verandahs. * Points to Remember. a. Every two edge supported slabs are always one way. b. All cantilever slabs are one way. c. Slab containing supports on less than 4 sides can be designed as the one-way slab. Reinforcement Details Of One Way Slab . Figure 1: Reinforcement Details of One Way Slab Dec 16, 2015 · When a rectangular slab is supported on all four sides, but the ratio of longer side, L, to shorter side, S, is two or more, L/S ≥ 2.0, then, the slab will act as a one-way slab, with bending primarily occurring in the short direction. Such slabs are designed as one-way slabs where the span length (L. n. May 15, 2020 · SLAB: Slabs are constructed to provide flat surfaces, usually horizontal, in building floors, roofs, bridges, and other types of structures. The slab may be supported by walls, by reinforced concrete beams usually cast monolithically with the slab, by structural steel beams, by columns, or by the ground. Slabs are classified into two types: One Way […] usually one and two-way spanning slabs • Punching shear –e.g. flat slabs and pad foundations Shear There are three approaches to designing for shear: • When shear reinforcement is notrequired e.g. usually slabs • When shear reinforcement isrequired e.g. Beams, see Lecture 3 • Punching shear requirements e.g. flat slabs Good Morning, There are lots of advantages of one way slab and two way slab. And it's depend upon the condition of the structure design and longer to shorter span. So How do you differentiate a one-way and two-way slab? Hey ! My name is SL KHAN and you are watching an Engineer boy. Slabs are basically two dimensional co... While designing one way slabs, less steel is employed hence the depth of the slab increases. While designing two way slabs, more steel is used hence the depth of the slab decreases. Examples : Examples of one way slabs are Chajja and Varandha slabs. Example of two way slabs is Slabs used in the floor construction of multi-storey buildings. The thickness of one-way slab varies between 100mm to 150mm or even more depending upon the span and based on the deflection considerations. The one-way slabs are economical up to the span of 3.6m. The one-way slab is a simple wide shallow rectangular beam as far as its structural analysis is concerned. Estimating Two-Way Slab Deflections Spreadsheet includes construction load effects Many studies have shown that the service behaviors of two-way slab systems are sensitive to the effects of construction loading.1 Because construction loads can approach or even exceed service level design loads, shoring and reshoring must be used Nov 27, 2012 · For example, when parallel walls connect to either side of a continuous slab, one-way action results. To enforce one-way action, assign small m11 or m22 stiffness modifiers to the slab. These modifiers, available through Assign Area > Stiffness Modifiers, should be applied relative to the local axes and the desired direction of one-way action. Depending on the arrangement of supports, a slab may be subjected to. one way bending: one-way slab two way bending: two-way slab. One way Slab: Ly/Lx≥ 2. Two way slab: Ly/Lx≤ 2 By definition Ly>Lx. 11 ##### FLOOR SYSTEM CURRENTLY USED IN PRACTICE. flat slab. flat plate. one-way slab Foster et al. (2010) two-way slab 13. waffle slab In one-way slab, the load is carried in one direction perpendicular to the supporting beam. In two-way slab, the load is carried in both directions. 6: The deflected shape of the one-way slab is cylindrical. Whereas the deflected shape of the two-way slab is a dish or saucer-like shape. 7: Chajja and Varandha are practical examples of one-way slab • Flat Slab • Haunched Slab A longitudinal slab is one of the least complex types of bridge superstructures. It is composed of a single element superstructure in comparison to the two elements of the transverse slab on girders or the three elements of a longitudinal slab on floor beams supported by girders. Oct 20, 2014 · CERM 13th ed. Example 51.1 uses a shear strength reduction factor (phi) of 0.85. Everything Ive read in the CERM and ACI 318 leads me to believe this should be 0.75. Is this a typo in the CERM or is there some special circumstance for one-way slab design that would make this 0.85? AND ONE-WAY SLABS ENCE 454 – Design of Concrete Structures Department of Civil and Environmental Engineering University of Maryland, College Park SPRING 2004 By Dr . Ibrahim. Assakkaf CHAPTER 8b. SERVICEABILITY OF BEAMS AND ONE-WAY SLABS Slide No. 1 Long-Term Deflection ENCE 454 ©Assakkaf Example 2 Calculate Ig, Igt, Mcr, Mcrt, and Icr for ... Example Load Distribution Problem 7 The floor system of a library consists of a 6-in thick rein-forced concrete slab resting on four floor steel beams, which in turn are supported by two steel girders. Cross-sectional areas of the floor beams and girders are 14.7 in2 and 52.3 in2, respectively as shown on the next page figure. Jun 11, 2016 · This is another example of an One way slab for you. You can also Refer to the previous posts for RCC slabs. RCC slab Ready ? let us start . We are referring to the slab between columns C11, C12 ,C2 & C3 : For finding out the slab dimensions , you shall have to refer to the architectural plan . This is the relevant portion : One‐way framing action Beam spans typically up to 65 ft (20 m) Slab spans typically up to 30 ft (9.1 m) Effective frame action along beam lines Clean soffit for mechanical & electrical Beams and One‐way Slabs 49 50 Slab types can be decided through side ratio calculation through BS8 110 reference such as: Ly / Lx <2.0 (two way) Ly / Lx > 2.0 (one-way) with Ly was longer side and Lx was shorter side. A slab is called one-way if the main reinforcement designs within one direction only. This situation happens if slab is supported only on two sides only. If slab were supported at all four sides, slab will become one way if long span ratio (Ly) to short span (Lx) is exceeding 2. Because of slab string one ... Good Morning, There are lots of advantages of one way slab and two way slab. And it's depend upon the condition of the structure design and longer to shorter span. Jul 26, 2014 · This entry was posted in Excel sheets and tagged Excel Sheets, one way slab design excel sheet, one way slab design spreadsheet, slab design excel sheet, spreadsheets by CIVILENGINEERSPK. Bookmark the permalink. FOREWORD The Reinforced Concrete Design Manual [SP-17(11)] is intended to provide guidance and assistance to professionals engaged in the design of cast-in-place reinforced concrete structures. Nov 27, 2012 · For example, when parallel walls connect to either side of a continuous slab, one-way action results. To enforce one-way action, assign small m11 or m22 stiffness modifiers to the slab. These modifiers, available through Assign Area > Stiffness Modifiers, should be applied relative to the local axes and the desired direction of one-way action. We determined the weight of the Re-Bars for a one way slab in earlier post. Refer the post here : ONE WAY SLAB : REBARS Today , let us find out the cost of materials in totality. Please remember this is only the cost of materials. For finding out the complete cost of this item , we shall need to add many other elements.

Two-Way Slabs 3 4. Direct Design Method "D.D.M" Before Discussion Of this Method, we have to study some concepts: 1. Limitations: 1. Three or more spans in each direction. 2. Variation in successive spans 33% ( . 3. LL 2 DL 4. Column offset 10% in each direction. 5. L/B 2. 6. For slabs on beams, for one panel. 2. Determination of Two way slab ...