中文摘要：

为研究我国《预应力混凝土结构抗震设计规程》（JGJ40-2004）所规定的PC框架结构轴压比、柱端弯矩增大系数等设计参数取值的合理性,根据该规程设计了6榀轴压比与柱端弯矩增大系数取值不同、抗震等级为二级的PC框架结构,在Open Sees软件中,采用基于材料的非线性纤维梁柱单元建立其数值分析模型,考虑材料、荷载、地震动等参数的随机性,分别对其进行基于增量动力的易损性分析。研究表明：当轴压比相同时,提高柱端弯矩增大系数,或在柱端弯矩增大系数相同时,减小柱的轴压比,均能有效地改善PC框架结构的抗震性能;04规程中规定的二级PC框架结构的柱端弯矩增大系数限值偏小,规程修订时应予以增大,建议≥2.0;04规程中规定的二级PC框架结构的轴压比限值偏大,规程修订时应予以适当减小,建议〈0.7。

英文摘要：

To investigate the rationality of the engineering design parameters, that is, axial compression ratio and moment magnifying coefficients at column ends, etc., specified in the current code for seismic design of prestressed concrete structures （JGJ140-2004）, six seismic grade for secondary bonded PCF are designed with various axial compression ratios and moment magnifying coefficients at column ends according to the current code. In addition, with the consideration of randomness in material, loads and the ground motion, the corresponding models based on nonlinear fiber beam-column finite element are established in Opensees. Finally, on the basis of incremental dynamic analysis, the seismic fragility analysis is performed for each model, respectively. The results indicate that： whether increasing the moment magnifying coefficients at column ends while keeping the axial compression ratio invariant or decreasing the axial compression ratio while keeping the moment magnifying coefficients at column ends unchanged, both of which has a positive impact on the structural seismic performance. Hence, suggestions were proposed in the revision of code for aseismic design of prestressed concrete structures that the moment magnifying coefficients at column ends should be improved appropriately （greater than 2.0）, and the limitations on axial compression ratio should be stricter （less than 0.7）.