| According to fundamental principle of elasto-plastic history analysis, and considering the feature of the R.C frame-braced structure, this article analyses the performance of force bearing and deformation behavior of R.C frame-braced structure under seismic responses by using structure design software PMSAP for multistoried and high-rise building & EPDA(Elastoplatic Dynamic Analysis).The article compares behaviors of R.C frame-braced structure with behaviors of normal frame structure, discusses factors that influence seismic responses performance of R.C frame-braced structure,and it researches different arrangements of braces that influence structure seismic responses performance. The results show that different arrangements of braces have a remarkable effect on the dynamic property of structure, and structures in different arrangements of braces with same number also perform differently under seismic responses. Reasonable arrangements of braces should follow the principle of'uniformity, symmetry& peripheral.The changes of types and stiffness of braces will influence the performance of force bearing and deformation behavior of different parts of the whole structure, and then influence seismic responses performance of the whole structure. By calculating and analysing different models, the article makes a conclusion that although changes of those factors may influence seismic responses performance of the whole structure, they influence far less than changes of arrangements of braces.According to 'Code for Seismic Design of Buildings', when calculates seismic responses of structure by using elastic history analysis method, more than one earthquake waves should be used in calculation to make sure that calculation results can reflect seismic responses performance of structure in the round. R.C frame-braced structure will access elastic-plastic deformation phase in higher seismic acceleration, and then structure stiffness catagenesis should be considered.R.C frame-braced structure is a ductile structure which has multi-seismic fences. When designed reasonably, it will have good seimic behaviors, and will yield damage in sequence of braces, beams, and columns. When braces yield, they consume much seimic energy and reduce earthquake damages. So in design work, to achieve reasonable damage mechanism, firstly braces should be arranged correctly, then, right choice of types and stiffness of braces. |
