Seismic Performance Evalution Of Concrete Filled Steel Tube Composite Frame With Considering Reliability

Earthquake resistant design is in order that structures possess expected reliability under future earthquake. Rational earthquake resistant design method and dependable a seismic structural system may alleviate the seismic damages of structures by a long way. With the development of the social economy and the enhancement of the structural functional requirements, primary design criteria and method have many obvious deficiencies. In recent years, performance-based seismic design method has gained increasingly interest. With the deepness of cognition and research, with the increasing application of the performance-based seismic design method, its advantage will be more and more obvious. The performance evaluation of structure is also becoming increasingly important. The use of circular concrete-filled tube (CCFT) coloumns composite structures become wide because it is of superior seismic performance, which requires us to create seismic performance assessment criteria. The subject of thesis is CCFT columns and CCFT column-steel beam composite frame. In the thesis, the displacement based performance based was play on the circular steel concrete filled steel tube beam-columns. This kind of performance evaluation can be used to structures which had been built and the design of structures.There are several parts of the research work in the thesis. The first chapter introduced the former studies about the performance-based especially the displacement-based seismic design and the seismic performance of circular concrete-filled steel tubular columns, the author points out that the important of seismic evaluation of composite frame. The second chapter is about using the incremental dynamic analysis to get the capacity value. The third chapter uses the data of references to evaluate the damage state of CCFT columns and how to use the result to performance based design. The fourth chapter is using the non-linear time history analysis to get the demand value of the structures under two kinds of seismic hazards. The fifth chapter is the solution of the demand and capacity factors within the reliability, following the solution of confidence level. Finally, the author proposed a method of performance evaluation of composite structures within the reliability.