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Hello Everyone, I am wandering if somebody guide me through the design of lift shaft for composite Structure. By composite i mean two existing walls are RCC one will be back wall and one side wall. Other two will be steel walls and opening is in steel wall. I have asked for the structural details of the existing RCC walls to check there steel and if they are designed as shear walls or not. I have to add the steel walls to make a shaft. I want help if i have to check the steel walls what should be my approach as it is not high rise its just a two storey building and lift will be GF plus FF only. the loading i have to consider is hoist load on the top of the walls which more or less behave like point load and i have to chk this for dynamic loading for vibrations that can cause or not later about the lateral loading. I think the connections will be simple as there will be no such great moments so i assume them pin connections. Loading for the diaphragm beam should be the slab load if there any and lateral loading. Bracing for the wall for lateral load. What about connections between RCC and steel should i keep them also pin or fixed with moments because what i am thinking that if the hoist is placed on RCC and steel wall then it will create the moments at the connection. So it has to be fixed. but then in that case the RCC wall should be able to resist the loading applied at that point. Please go through these points and suggest me what should i do. And yes if some one have any kind of design data or calculation example for lift shafts that will be great help. Regards. .