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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。
In order to study the reasonableness of the design parameters of PC frame structure axial compression ratio and column end moment increasing coefficient as stipulated in the Code for Design of Seismic Design of Prestressed Concrete Structures (JGJ40-2004), 6 榀In the Open Sees software, a numerical analysis model based on material-based nonlinear fiber-reinforced beam-column elements is established, considering the different values of the axial compression ratio and the bending moment increasing coefficient of the column end, and the seismic grade of PC frame structure. Load, earthquake and other parameters of the randomness, respectively, based on incremental dynamic vulnerability analysis. The results show that when the axial compressive ratio is the same, increasing the bending moment increasing coefficient of the column end or decreasing the axial compressive ratio of the column with the same bending moment increasing can effectively improve the seismic performance of the PC frame structure ; 04 rules specified in the second-level PC frame structure of the column-side bending moment increase coefficient limit is small, the revised procedures should be increased, it is recommended ≥ 2.0; 04 provisions of the secondary PC frame structure axial pressure ratio The limit is too large, the procedure should be appropriately reduced when revised, the proposed <0.7.