![]() ![]() Compare the outputs and see what you get. Could still look at going a little coarser. If you've got a composite slab, then perhaps the 1' x 1' mesh size is a bit more appropriate. This is due to its high mass and relatively high stiffness. Vibration control Concrete has very good vibration characteristics for areas sensitive to vibration such as laboratory buildings and hospitals. The auto-meshing for ETABS also doesn't appear to be that intelligent, so if you've got any unusual geometry such as changes in orientation from a standard orthogonal grid system, the mesh produced by Etabs' automesh is essentially useless. Ribbed slabs increase that benefit by increasing the surface area of the soffit so that the heat can pass into the thermal mass more efficiently. Finer mesh would be appropriate near changes in plan orientation or openings. Would make sure you have your slabs meshed at supports and load points and then at intermediate areas so distance doesn't get too crazy where you don't have supports or load points(every 15-20'/4-6meter seems to be a happy median for me). environment, three medium size structures are modeled using Etabs. Ribbed slab etabs software#initial stage is done using structural software ETABS Nonlinear V.9.7.4. Ribbed slabs and waffle slabs are more prone to hidden beam inclusion due to. If you've got a thicker concrete slab, then you should be able to justify the slab as a rigid diaphragm, in which case really fine meshes don't really help that much. Precast joist is used in one way ribbed slab and premature failure should be. Check the limitation requirements explained in Section 17.8.1. 3- Determine total factored load (dead load and live load).) 4. I have stopped allowing ETABS to auto mesh my slabs in most cases. Design Two Way Solid and Ribbed Slab-Hollow Block Slab using Direct Design Method (DDM) 1- 2- (Determine slab thickness). RE: ETABS slab meshing MrHershey (Structural) 27 Aug 12 13:30 think it will take ETABS a long time just to analyze my model.Īny advice on this would be appreciated. then again the question is, if i have a high rise structure (say 40 sty) and i mesh all my slabs by say 1m x 1m. i also noticed that if i auto mesh the slabs into smaller sizes (say 1x1m), the moment & shear diagrams on the beams become much realistic, but if i use the default meshing, the resulting moment & shear is a bit far off from what i am expecting. so I am just want to know the usual rule of thumb regarding the auto-meshing of slabs.Īnother thing i usually assign the interior wall loads as a null beam with a load, the interior wall (usually light bricks) will be placed on slabs. I found out that the more i mesh the better the accuracy but i am wondering if you have a high rise structure and you mesh the slabs by 1m x 1m. Maximum spacing of shear links = 0.75d = 0.75 × 211 = 158.75 mmĪ142 BRC Mesh can be provided or H8 250mm c/cįor more information on design and consultancy to accomplish the most challenging design brief, contact the author on Thank you, and God bless you.Hi, I just want to ask what is the usual size of auto-meshing do you assign for slabs (assigned as membrane) in a framed structure (those with beams & col). ![]() ![]() But for this design, we will therefore provide minimum shear reinforcement.Ī sw / S = ρ w,min × b w × sinα (α = 90° for vertical links) Since Actual L/d (23.696) V Ed (17.25 kN), no shear reinforcement is required.Īccording to clause 6.2.1(4), minimum shear reinforcements may be omitted in ribbed slabs where transverse distribution of loads is possible. Using analytical available softwares (ETABS,SAFE,Proken, etc. Attending discussions related to project approving in DM. Designing a raft foundation taking in the temperature effect into consideration in analysis and design. Therefore limiting L/d = 1.37 × 0.8 × 66.514 = 72.899 Using two types of slabs consisting of solid slab and one-way ribbed slab. For the flat slab shown in Example 2.1, use USD to. Reinforced concrete structure has a one-piece base, ribbed elements can withstand heavy loads, which are 'working' on a bend. (ix) Briefly outline the design provisions for two types of shear reinforcement in flat slabs. instagram story viewer Ribbed floor slabs have an important feature. In those places where there are no load (or they are minimal), concrete is removed. If the load is too large, the Monolithic concrete slab reinforced by transverse ribs. Reinforced concrete structure has a one-piece base, ribbed elements can withstand heavy loads, which are 'working' on a bend. Therefore multiply basic length/effective depth ratio by 0.8 Ribbed plates are ideal elements that are able to withstand considerable weight at the same time they allow you to create a fairly large spans. Ribbed floor slabs have an important feature. ![]()
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