【摘要】 通过对一典型的框架结构1/8整体模型模拟地震振动台试验,测试了模型结构的动力特性、阻尼比及其在7度多遇、7度基本、7度罕遇、8度罕遇烈度地震作用下的加速度和位移反应等,研究了模型结构的破坏机理和破坏模式,运用有限元分析程序对原型结构进行了地震作用下的时程分析,并与试验数据进行了对比分析。对比结果表明,试验与理论分析结果吻合良好。研究得到:该结构体系在7度多遇烈度至设防烈度地震作用下结构自振频率基本不变,结构基本处于弹性阶段;在7度大震作用下,结构自振频率有所下降,最大层间位移角满足规范的弹塑性变形要求;在8度大震作用下,结构局部出现混凝土开裂和压碎现象,但能维持结构不倒塌的工作状态。综合研究结果表明该结构能满足小震不坏、中震可修、大震不倒的抗震设防要求。更多还原

【Abstract】 A shaking table test of a 1/8 scale model of a typical reinforced concrete frame structure is carried out.The model’s dynamic properties,damp ratio and response of acceleration and deformation on the different level earthquakes are studied.Its dynamic behavior,cracking pattern and failure mechanism are discussed as well.A 3-D finite element analysis was conducted to evaluate the structural seismic performance.The comparisons between the analytical and experimental results showed that the natural frequencies remained almost constant demonstrating an elastic behavior of the structure until basic earthquake of intensity 7.Under rare earthquake of intensity 7,natural frequencies decrease to some extent.Corresponding to rare earthquake of intensity 8,concrete crush occurs but no collapse happens to the model.The maximum inter-story drifts under different earthquake levels are smaller than the allowable limits stipulated in Chinese code.Conclusion can be drawn that the structure can meet the requirements of no damage under frequent earthquake,repairable damage under basic earthquake and no collapse under rare earthquake.更多还原