Study On Anti-seismic Behavior Of Main Machine Hall In Conventional Island Based On Pbsd

China is in a special period that both development of economy and transformation of economic structure have to be considered. A large supply of energy is needed to guarantee the development of national economy. Nuclear power is a kind of renewable energy and is becoming a more and more important development object. However, China is one of those countries that suffer from the disaster of earthquake. Therefore, a further research on the anti-seismic behavior of nuclear power station is needed.Performance-based design method of structures is considered to be an international advanced seismic design idea. The leaders in the field of earthquake engineering, such as the United States and Japan, are currently under consideration of transforming the traditional design method to the advanced method. One of the typical characters of PBSD is that the method require designers to quantify the behavior of the structure components due to multiple performance targets that adopted in design procedure. The importance of numerical simulation of structure is also emphasized. New technology and new material, as well as new structure system that haven't provided by the code can also be employed by PBSD on the base of convincing improvements.This paper presents the theory of Performance-based structure design, as well as its development history. Based on the experiences of practical engineering, the PBSD method that suitable for Chinese codes is concluded. Performance targets and deformation criteria for concrete and steel components are also concluded according to various codes home and aboard. The PBSD method that suitable for Chinese codes was employed in the anti-seismic analysis of main machine hall in conventional island of nuclear power station and the evaluation of the behavior of main machine hall is made.Due to the requirements of the machine equipments, the main machine hall is irregular in mass and stiffness. It is important to notice that the essential purpose of main machine hall is to prevent serious damage of important equipments and reduce the economy cost encountering earthquake. According to the character of the main machine hall, this paper sets different performance targets for the main machine hall components. 5 site acceleration records are adopted for the performance-based analysis of typical main machine hall. The performance analysis under frequent seismic and middle seismic is carried out in SAP2000. The nonlinear analysis of main machine hall is carried out in Perform-3D.This paper indicates that the main machine hall designed by the present design method can satisfy the performance target set in the paper, including strength capacity and deformation ability. However, the behavior of the structure under seldom earthquake is different from the prediction of the designer. The frame components near the gable wall went into nonlinear procedure while the components far from the gable wall still remain elastic, which different from the prediction of the design. This might be caused by the sway load and other uncertain equipment load considered during the structure design. The analysis procedure indicates that the performance-based design method can quantify the response of main machine hall under different level of earthquake. This will provide a clear concept of the behavior of the machine hall to the designer and it is convenient to optimize the structure. The results also show that nonlinear analysis based on fiber elements can be employed for complicated structure simulation.