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I have a soft copy of ETAB example step by step procedure for Indian code with seismic, wind loading. Posted: Wed 2:59 am Post subject: ETAB Step by step example with wind and seismic loading Plate thick: is used where shear is predominant. Plate thin: is used for raft foundation where bending is predominant. Membrane: used for conventional slab with beam. The definitions as applicable with etabs are as under: What ever definitions about plate, shell and membrane are mentioned in Text books do not necessarily compare with the software. For detailed reference please refer the book by Salvadori. They are thinner than plate elements and cannot carry bending. Membranes carry load by tension along the plane only. You should model slabs as shell elements. Is there anything else to be taken care for slabs or beam design ?Īnd talking about T beam action i meant stresses will be shared by slab along with beams for which we generally dont design slab if used IS 456 co-effi. or need to design as per the stress contour obtained from etabs analysis? and which stresses to be checked ? Thank you for sharing your views, as u said that concept is understood correctly by me but if we use shell as slab type can we design slab using co-efficient method given in IS 456. In frame analysis design support moment is always higher than mid point moment. I feel you can not model T beam for frame analysis with lateral load. But in frame structure with lateral load no component will work as T beam. T beam may be useful for very very simple structure viz wall, column and beams. Check with that.īy and large you appear to be correct in understanding membrane, shell and plate in etabs. If you need bending in one direction say for one way slab it is OK but usually slab is assigned as shell element even if it is exported to STAAD since there are options in Etab while exporting to other software. Generally people don’t use shell or plate and use membrane as it matches results with Staad frame analysis (without slab modeling) with which they are used to, but Etabs does have facility to analysis beam slab floor acting together (T -beam analysis - not design) then can I use that and design beams for reduced moments I get by this analysis?įor RCC shell element assignment is best since it will take care of bending in two direction which is for 2 way action and it will of advantageous in lateral analysis. The other thing is that which is ideal for modeling of RCC slab in Etabs? And what cares should be taken in design etc while assigning any particular type to slab?ģ. (Which I feel will be the actual on site condition).Ģ. So, when we assign slab type as membrane, it only transfers forces to beams supporting it and does not take part in load taking along with beams, but when we go for shell or plate they have out of plane stiffness as well, so they take part in load caring along with beams (as if T beam is put) and sagging moments in the beams get reduced significantly. Shell type slab = both in plane and out of plane stiffness Plate type slab = only out of plane stiffness and no in plane stiffness Membrane type slab = only in plane stiffness and no out of plane stiffness It has got 3 options to define slab type 1. I have a question regarding modeling of RCC slab in Etabs software. Posted: Mon 11:38 am Post subject: Slab modelling in ETABS -membrane, plate or shell ?
Slab modelling in ETABS -membrane, plate or shell ? Use online scanners here and here to upload downloaded attachment to check for safety. Warning: Make sure you scan the downloaded attachment with updated antivirus tools before opening them.