摘要
为研究含有薄弱层的RC框架的抗震加固方法,采用带框钢支撑对薄弱层进行加固并进行拟静力试验研究。以某抗震承载力不足的既有3层框架结构为原型,设计和制作试验模型。采用3点混合控制加载,观察试验现象,得到楼层剪力与层间位移的滞回曲线,比较模型各层的初始刚度和刚度退化情况。研究结果表明:采用带框钢支撑对薄弱层进行加固后,薄弱层的初始刚度和承载力均有较大幅度的提高,模型各层均表现出一定的塑性变形和耗能能力。试验模型的破坏模式表明:带框钢支撑会对框架梁产生附加剪力,造成框架梁剪切破坏,在后续研究中需要注意支撑布置对结构破坏模式的影响。
In order to study the seismic strengthening method of RC frame with weak story, quasi-static test of a RC frame strengthened by steel frame braces is carried out. The test model is designed and constructed based on an existing prototype building which has poor seismic resistant capacity. Three point loading history are carried out by using hybrid control method. The test phenomenon and hysteretic curve between shear force and story drift are obtained, the model initial stiffness and stiffness deterioration of each story are compared. Analysis results indicate that the initial stiffness and bearing capacity of weak story are improved after strengthened by steel frame braces and the capability of ductility and energy dissipation of each story are also increased. The failure mode of test model shows that inductile damage occurred in RC beam is due to the additional shear force produced by steel frame braces. The relationship between braces arrangement and structural failure mode should be noticed in future study.
出处
《建筑科学》
北大核心
2014年第1期75-79,共5页
Building Science
基金
住房和城乡建设部研究开发项目(2012-k2-30)
关键词
拟静力试验
带框钢支撑加固
薄弱层
RC框架
混合控制加载
quasi-static test
strengthening using steel frame brace
weak story
RC frame
hybrid control loading