底部加强型矩形截面钢管混凝土叠合柱抗震性能研究  

Study on seismic behavior of bottom strengthened rectangular steel tube reinforced concrete columns

作　　者：曹万林[1] 惠存[1] 董宏英[1] 许方方[1] 乔崎云[1] 

机构地区：[1]北京工业大学建筑工程学院,北京100124

出　　处：《世界地震工程》2013年第3期14-21,共8页World Earthquake Engineering

基　　金：国家自然科学基金(51178010);北京市教委科技计划重点项目(KZ200910005008)

摘　　要：提出了一种底部加强型矩形截面钢管混凝土叠合柱,采取在柱底部区域钢管周边贴焊钢板的构造措施,以提高其抗震耗能能力。进行了3个不同构造尺寸的矩形截面钢管混凝土叠合柱模型的水平低周反复荷载试验。模型的原型为北京平西府地铁超大平台结构的一种组合柱,模型按1/5缩尺。试件1为普通矩形截面钢管混凝土叠合柱试件,试件2为在试件1的底部钢管受弯应力较大的管壁外侧贴焊钢板的试件,试件3为在试件1的底部钢管四周外侧贴焊钢板的试件。分析了各试件的承载力、刚度及其退化过程、延性、滞回耗能特性和破坏特征。提出了底部加强型矩形截面钢管混凝土叠合柱正截面及斜截面承载力计算公式,计算结果与实测符合较好。研究表明:所提出的底部加强型矩形截面钢管混凝土叠合柱与普通矩形截面钢管混凝土叠合柱相比,承载力、延性和抗震耗能能力显著提高。The bottom strengthened rectangular steel tube reinforced concrete （STRC） column was put forward. The bottom area of the rectangular column was welded with steel plates to improve the seismic capacity. Three 1/5 scaled column models with different structural measures were tested under horizontal low cyclic loading. The proto- type of the model is a kind of composite column of super large platform structure in Pingxifu metro station of Bei- jing. Model 1 is a conventional rectangular STRC column;Model 2 is a rectangular STRC column welded with steel plates at the outer part of the bottom in the vertical direction to loading ; Model 3 is a rectangular STRC column wel- ded with steel plates at the outer surrounding part of the bottom. The load-bearing capacity, stiffness and its degra- dation process, ductility, hysteretie energy dissipation capacity and failure characteristics of the models were ana- lyzed. The load-bearing capacity calculation formulae for normal section and oblique section of bottom strengthened rectangular STRC column was presented, and the results obtained from the calculation are in good agreement with those from the experiments. The study shows that the load-bearing capacity, ductility and seismic energy dissipation capacity of the bottom strengthened rectangular STRC column are improved obviously compared to the conventional rectangular STRC column.

关 键 词：底部加强型 矩形截面 钢管混凝土叠合柱 抗震试验 承载力计算 

分 类 号：TU398[建筑科学—结构工程]