钢筋混凝土框架-剪力墙模型结构的拟动力试验研究

为进一步研究框架-剪力墙结构的抗震性能,以某大型火电厂7层7跨钢筋混凝土主厂房纵向框架-剪力墙结构体系的实际工程资料为背景,取几何缩尺比1∶8将原型结构转化为模型结构,分别通过不同地震水平的拟动力试验和伪静力试验对模型结构的开裂、屈服顺序、耗能能力、刚度退化、承载力、延性及变形性能等进行研究,分析了模型结构的破坏机理、受力特点、内力分布规律、结构的薄弱部位和动力反应。试验表明,模型结构的荷载-侧移滞回曲线饱满,耗能能力较好,具有良好的抗震性能,其破坏模式是剪力墙根部先屈服、随后梁端逐次出现塑性铰、最后柱根屈服;剪力墙对结构的承载能力和变形性能有较大影响,框架-剪力墙的协同工作随结构塑性变形的发展而变化。研究结果为此类结构的抗震设计提供了基础。

Pseudo-dynamic test of a reinforced concrete frame-shear wall model structure

To further understand the seismic behavior of frame-wall structures,a pseudo-dynamic test and a pseudo-static test are carried out for a 1∶8 scale model structure under different horizontal earthquake actions,with the prototype being a seven-story and seven-bay longitudinal reinforced concrete frame-shear wall main workshop of a large thermal power plant.The cracking process,yielding sequence,energy dissipation,stiffness degradation,bearing capacity,ductility and deformation performance of the model structure are investigated,and failure mechanism,stress characteristics,internal force distribution,weak parts and dynamic response of the structure analyzed.The test results indicate that the force-displacement hysteretic curve is plumper and the model structure has higher energy dissipation capacity and better seismic performance,and the yield sequence of the structure is root of shear wall first,end of beams second,and root of columns last.The shear wall significantly influences the bearing capacity and deformation performance of the structure,and the work correlation of the frame-shear wall structure varies with the development of plastic deformation.