无地下室框架结构整体计算模型的讨论.pdf

40 10 2010 10 * 1 2 1 1 刘庆志 , 贺小岗, 赵作周, 钱稼茹 ( 1 , 100084; 2 , 100084) [ ] 512 ! ! , , , , , , [ ] ; ; ; Discussion on rational model of RC frame structures without basement 1 2 1 1 Liu Qingzhi , He Xiaogang , Zhao Zuozhou , Qian Jiaru ( 1Key La oratory of Civil Engineering Safety and Dura ility of China Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084, China; 2 Architectural Design and Research Institute of Tsinghua University, Beijing 100084, China) Abstract: Based on the ehavior of RC frame structures in 5 12 Wenchuan earthquake, such as strong eam 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 ases tied together y tie eams was proposed. In this approach, the ottom columns are assumed to e fixed at the top level of the tie eams rather than at the top of the column ases, and the inner forces for the upper structure mem ers are used for their reinforcement. As a result, the design moments near eam ends will decrease and the design moments near column endswill increase. This result is more close to strong column and weak eam of national seismic design code requirement. This approach is simple and more relia le. Design methods for ottom columns, tie eams and column ases were proposed as well. Keywords:frame structure; analytical model; fixed level; tie eam 1