Optimal Desigh Of Irregular L-Shaped Planer Frame Structure And Pushover Analysis

Reasonable shape and arrangement of buildings is one of most important parts in the seismic design, so the simple and symmetric structure in the plane and elevation is the most advocated。According to Code for seismic design of building (GB50011-2010) of China, construction should be designed regular in the plane, facade and vertical in accordance with seismic concept design of buildings.In the actual projects, some building have to be designed with irregular plane due to aesthetics, function or the limiting condition of the area.Now, we have not master the law of irregular structure clearly, hence, it is great meaningful to research it for the development of civil engineering。It is significant to evaluate the degree of irregularity of building, the same as taking reasonable model and guideposts of torsion calculation. Especially due to frequent earthquake in recent years, elastic-plastic deformation checking is guarantee of protecting life and property. Thus, this paper do some research on above problems combining engineering example。This paper based on a engineering example, researches the irregular-shaped planer frame structure on two aspects:one is by sizing optimization adjusting section size up to the standard of displacement, contract the change of displacement radio and period radio, then by shaping optimization changing the length of L shaped structure, and contract the displacement, displacement radio and period radio; the other is proceed pushover analysis on two schemes which are content the displacement in the former optimization, meanwhile, the paper summarizes the condition of plastic hinges, with the purpose of observing earthquake-resistant of the structure.There are conclusions following through the research of this thesis:(1) Increasing the column size in the direction which is out of displacement ratio and the height of section in outer ring of the building plays weak roles on controlling displacement of this direction;(2) Increasing the height of section in the direction which is out of displacement ratio exert a remarkable and positive effect on controlling displacement of this direction, but this process may lead "L" structure to appearing plastic hinge destroying densely around the corner;(3) Adding column at the part of low stiffness can decrease the displacement ratio effectively, and this method does not cause plastic hinge destroying; (4) With the bulge size of "L" structure increasing, the period ratio and displacement ratio get lager, on the contrary, the ratio between the maximal interlaminar displacement and the average interlaminar displacement get smaller.