RC梁-核心区钢管壁开洞组合柱节点试验

Experimental study on connections of RC beam-composite column with openings on steel tube

摘要:

为了研究核心钢管壁开洞对钢筋混凝土(RC)梁-组合柱节点区受力性能的影响,完成了4个试件的低周往复加载试验．试验结果表明:试件的力-位移滞回曲线比较饱满,弹塑性变形能力大;梁柱纵向钢筋配筋率以及柱的钢管含钢率与实际高层建筑工程基本一致的试件为梁受弯破坏,实现了强柱强核心区弱梁的抗震设计要求;洞口周围设置加劲板或加厚钢管壁能有效改善钢管壁开洞核心区的抗剪性能,提高核心区的受剪承载力．

Abstract:

In this paper, quasi-static tests on 4 connection specimens of reinforced concrete beam-composite column with openings on steel tube were introduced to study the mechanical performance of the core area. The test results showed that the force-displacement hysteretic loops of specimens were plump, and the elasto-plastic deformation capacity of specimens was large. The specimen which the longitudinal reinforcement ratio of beam and of column and the steel ratio of steel tube of column were about same as those of the actual high-rise building failed in bending of the RC beam, and the seismic design requirements of strong column, strong core and weak beam were accomplished. Strengthening the steel tube with openings by welding stiffeners around openings or by thickening the tube wall could improve the shear behavior of the core area effectively, and enhance the shear strength of the core area.