Study On The Optimization Design Of Underground Garage Of Multi-tower Structural Building With Enlarged Base

Residence communities with multi-tower structure and enlarged base have already became essential building facility. They take the advantage of the courtyards'underground parts to form a space, in where underground garage can be designed to solve the increasingly prominent contradiction between greening and parking. However, during the design process, because of the differences between the roof structure of garage and the thickness of covering earth, as well as the vagueness in fire load description of our design specifications, it is necessary to make an intensive of it.In this paper, considering from relevant provisions of the fire load in"Loading code for design of building structures", and the fact of the equivalent uniform live load and its most unfavorable arrangement, we can get the reasonable value of fire loading under different conditions through the way of theoretical calculations, relationship analysis of load, cross-board as well as the thickness of covering earth with the help of the FEM analysis software and the equivalent value range of one-way slab and two-way slab from a situation of small span and laminated covering earth. The results show that the present load code for the fire loads of underground garage are too general, and the value is also less than normal value on the condition of small span and laminated covering earth. If there is sufficient covering earth, the equivalent uniform live load of one and two-way slab could be collected from the load of vertical wheel, that is 10 kN /m~2.Based on the principle of the"Code for design of garage buildings"as well as other relevant provisions, it is essential to combine the Vehicle Operation Law with the contrast of common column values to achieve the purpose of optimizing column grid through theoretical calculations.Then, this paper, taking an example of certain project, makes a contrastive analysis of the economic perfor By these examples, this paper will give a brief introdction of composite slabs. mance of several garage roof structure, such as principal and subordinate-beam structure, inverted beam structure, cross beam structure, hollow slab structure and the flat slab structure.Through the study of the optimization design of underground garage, the author hope that it will give some help in selecting schemes of underground garage.