【摘要】 针对空间异形柱框架具有柱横截面不规则等特点,提出适用于该结构非线性有限元分析的方法。对该框架作适当的单元划分,并用子结构法及静力凝聚法提高计算效率,得到简化计算模型。在该模型中,运用分区离散截面法及主从系统中的偏心转化法来完成对异形截面的分离与组合。将该计算模型与单向及反复推覆分析方法相结合,探讨了空间异形柱框架结构抗震性能的分析方法,并验证了其有效性。通过对不同柱肢长宽比的空间异形柱框架在不同方向水平荷载作用下的推覆分析,获得柱肢长宽比对该框架抗震性能的影响规律。更多还原

【Abstract】 Nonlinear finite element analysis for 3D-frames with special-section columns is presented considering the frame features such as irregular cross-section of the columns. The frame was divided into elements properly; substructure and static condensation were utilized to increase computational efficiency. A simplified calculation model was obtained in which zonal discrete section method and eccentricity transition matrix in master-slave systems were applied to separate and fabricate the special-section of the column. Based on the model, the method to analyze aseismic performance of the 3D-frame with special-section column was set up by PUSH-OVER method under the unilateral and reversed cyclic loadings. The proposed method was verified. The 3D-frame with various length-width ratios of column limb was analyzed by PUSH-OVER under loading in various horizontal directions. The influence of length-width ratio of column limb on aseismic performance of the 3D-frame was discovered.更多还原