【摘要】 结合5.12汶川地震中框架结构"强梁弱柱"与"柱脚塑性铰"等实际震害特征,通过对一座典型框架不同计算模型计算结果的分析对比,对采用独立基础并设有基础拉梁的现浇钢筋混凝土框架结构的整体分析计算模型进行了讨论与参数分析,建议可仅按柱底嵌固于拉梁上表面的分析模型进行上部整体结构的计算分析与配筋,这样梁端设计弯矩略有下降而柱端设计弯矩有所增加,更易于实现强柱弱梁的抗震目标,这样的分析模型设计简便并更符合实际结构受力情况。对拉梁以及拉梁以下柱及柱基础设计配筋方法提出了建议。更多还原

【Abstract】 Based on the behavior of RC frame structures in 5·12 Wenchuan earthquake, such as strong beam and weak column,plastic hinge at column foot occurred near ground level,etc.,and comparison of predicted results of a typical RC frame structure under different analytical models,a rational analytical approach for a RC frame with separate column bases tied together by tie beams was proposed.In this approach,the bottom columns are assumed to be fixed at the top level of the tie beams rather than at the top of the column bases,and the inner forces for the upper structure members are used for their reinforcement.As a result,the design moments near beam ends will decrease and the design moments near column ends will increase.This result is more close to strong column and weak beam of national seismic design code requirement.This approach is simple and more reliable.Design methods for bottom columns,tie beams and column bases were proposed as well.更多还原