节点区外包钢管穿筋式预制装配式混凝土梁柱节点抗震性能试验研究  

Experimental study on seismic behavior of precast concrete beam-column joints with wrapped steel tube and tensile reinforcement in the joint area

作　　者：陈丽华[1,2] 冯建东 薛彦涛 梁春旺 CHEN Lihua;FENG Jiandong;XUE Yantao;LIANG Chunwang(College of Civil Engineering,Hefei University of Technology,Hefei 230009,China;Anhui Key Laboratory of Civil Engineering Structures and Materials,Hefei University of Technology,Hefei 230009,China;China Academy of Building Research,Beijing 100013,China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]合肥工业大学土木工程结构与材料安徽重点实验室,安徽合肥230009 [3]中国建筑科学研究院有限公司,北京100013

出　　处：《建筑结构学报》2024年第5期196-206,共11页Journal of Building Structures

基　　金：国家重点研发计划(2017YFC0703606)。

摘　　要：梁柱节点的连接方式是影响装配式混凝土框架结构抗震性能的关键。为实现装配式结构现场高效施工并保证其抗震性能良好,提出一种节点区设置外包钢管和对拉钢筋的装配式梁柱节点。通过改变外包钢管厚度和补强板构造方式,设计制作4个足尺中节点梁柱组合体进行低周往复加载试验,深入探讨该类型节点的滞回性能、延性、刚度退化和耗能能力等抗震性能指标。结果表明:随着外包钢管厚度增大,梁端塑性铰向远离节点核心区方向发展;梁柱组合体的破坏现象主要表现为柱边缘混凝土压碎脱落、外包钢管鼓起变形及短钢梁段翼缘屈曲变形;梁端荷载-位移滞回曲线较为饱满,在往复荷载作用下有较好的延性和耗能能力;增大外包钢管厚度能明显提高承载力和耗能能力但延性会降低,补强板的设置有益于提高延性和耗能能力但对承载力影响不大。建立了该形式节点梁端受弯承载力计算方法,计算结果与试验结果比较吻合,可为该形式节点的工程应用提供参考。The connecting method of beam-column joints is the key to affecting the seismic performance of assembled concrete frame structures.A prefabricated beam-column joint with a wrapped steel tube and tensile reinforcement in the joint area is proposed to achieve efficient construction of assembled structures and ensure good seismic.Four full-scale beam-column joints were designed and manufactured for low cyclic loading tests by changing the thickness of the wrapped steel tube and reinforcing plates.The seismic behavior indexes such as hysteretic behavior,ductility,stiffness degradation,and energy dissipation capacity of this type of joint are discussed.The results show that the plastic hinge of the beam end develops away from the joint core area with the thickness of the wrapped steel tube increasing.The failure phenomenons of the specimens mainly manifest as the crushing and falling off of the concrete,the bulging deformation of the wrapped steel tube,and the buckling deformation of the short steel beam flanges.The load-displacement hysteretic loops of the joints are relatively plump.Under the low cyclic loading test,the joints exhibit good ductility and energy dissipation capacity.Increasing the wrapped steel tube thickness can significantly improve the joint’s bearing and energy dissipation capacity,but the ductility will decrease.The reinforcing plates are beneficial to improve the ductility and energy dissipation capacity but have little effect on the bearing capacity.The calculation method of flexural bearing capacity is proposed.The calculation results agree with the experimental results,which can provide a reference for practical engineering applications of this type of joint.

关 键 词：装配式混凝土结构 梁柱节点 外包钢管 对拉钢筋 拟静力试验 抗震性能 

分 类 号：TU398[建筑科学—结构工程]