Shariful Islam

Thank you sir . here i attach a file please comment. Marma Composite Ltd.EDB

Hi I want to know the use of diaphragms in etabs. i discus many people who are use etabs but i can't get justified answer about the application of etabs. I read the Technical reference of Etabs, where they write about Diaphragms. i get two type of diaphragms (plate or shell and joint or beam). My question. 1. When do i use Shell diaphragms (if floor present ) 2.When do i use joint diaphragms ( grade beam level where no slab are provide) NB: Diaphragms use to transfer the lateral load to the resisting element ( frame such as column. beam,shear wall)

Thank you for your comment. LX, LZ and LY is the member length according to the design parameter. I have upload a dwg drawing please check it and comment on the drawing. lz.dwg

In most of the case designer use LY, LZ and LX. I want to know why and when it use. Please explane it.