火灾后钢筋混凝土剪力墙抗震加固研究

项目名称： 火灾后钢筋混凝土剪力墙抗震加固研究

项目编号： No.51308213

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 建筑科学

项目作者： 刘桂荣

作者单位： 华北水利水电大学

项目金额： 25万元

中文摘要： 钢筋混凝土剪力墙是高层建筑结构中的主要抗侧力构件，当遭受火灾作用后，其抗震性能会明显降低，影响结构的安全使用。为了使受火后受损的剪力墙构件能够恢复正常使用，需要对其进行适当修复加固。本课题采用理论和试验相结合的手段,针对火灾后加固钢筋混凝土剪力墙的抗震性能进行研究。首先，对钢筋混凝土剪力墙进行持荷状态下的受火试验；然后对受火后的剪力墙试件进行损伤评估，对其进行加固，并对加固后的试件进行低周反复荷载试验，研究不同受火时间、轴压比等因素对加固剪力墙承载能力、刚度、变形及耗能能力的影响规律，分析加固机理和加固效果；最后，建立高温后反复荷载作用下的钢筋与混凝土粘结-滑移本构关系，并利用此本构关系建立有限元模型，对火灾后加固剪力墙构件的荷载-位移关系进行模拟，通过与试验数据的对比，验证计算模型的有效性。通过本课题的研究，期望为火灾后钢筋混凝土结构修复加固提供可靠的计算模型和试验数据。

中文关键词： 火灾后；剪力墙；加固；CFRP；BFRP

英文摘要： Reinforce concrete (RC) shear walls have been widely used to resist the lateral force mainly induced by the earthquake, especially in high-rise structures. It is noted that the seismic performance of shear walls is deteriorated by elevated temperatures, which affects the safety of the overall structure. Usually, repair of heat-damaged RC shear walls would be the only solution to regain structural capacity. In this research, both analytical and experimental methods are employed to investigate the seismic behavior of the repaired RC shear walls. Firstly, RC shear walls under an axial compressive load are exposed to fire on one side. Secondly, the residual bearing capacity of fire-damaged shear walls is evaluated, and the specified repair technique is choosed for strengthening the specimens. These RC shear walls repaired after fire are tested under the combined action of constant axial load and lateral load reversals. The effects of different factors, such as fire duration and the axial load ratio, on the performance of repaired shear-walls in terms of their stiffness, ductility, energy dissipation and the ultimate strength are studied based on the test data. And the strengthening mechanism, as well as the effect of repair technique is studied. Finally, a finite element model based on the bond-slip relationship bet

英文关键词： heat-damged；shear wall；retrofit；CFRP；BFRP