带暗梁厚板柱节点抗冲切性能试验研究  

Experimental Study on the Punching Shear Resistance Capacity of Thick Slab⁃Column Joints with Concealed Beams

作　　者：李萌 徐梁博 张婕 尚凯 赵方正 谢楠[2] LI Meng;XU Liangbo;ZHANG Jie;SHANG Kai;ZHAO Fangzheng;XIE Nan(Architectural Design Institute of China Railway Fifth Survey and Design Institute Group Co.Ltd.,Beijing 102600,China;School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]中铁第五勘察设计院集团有限公司建筑设计院,北京102600 [2]北京交通大学土木建筑工程学院,北京100044

出　　处：《铁道建筑技术》2023年第12期1-5,40,共6页Railway Construction Technology

基　　金：中铁第五勘察设计院集团有限公司科技研发计划项目(T5Y2020⁃B08)。

摘　　要：提出一种提高带暗梁厚板柱节点抗冲切性能的方法,将构造暗梁变为配筋率较高的普通暗梁,并增设3种抗冲切元件。为验证上述方法的有效性,考虑4种不同配置方案,进行5个节点抗冲切试验,分析节点破坏特征、位移延性以及钢筋和混凝土的受力特点。结果表明,与未配置暗梁的试件相比,配置暗梁可提高厚板柱节点的极限承载力,加大冲切环的周长,增加节点的延性;增设Π型栓钉或鸭筋可进一步改善节点的抗冲切性能;在暗梁内部增设型钢,可提高厚板柱节点的冲切承载力,大幅提高节点延性,但破坏时未出现明显的冲切环。最后基于试验结果,提出了带暗梁厚板柱节点的冲切承载力估算公式,为完善和修订规范提供参考。A kind of method was proposed to improve the punching shear resistance capacity of thick slab⁃column joints with the concealed beam.The tectonic concealed beam was replaced with high⁃reinforcement⁃ratio concealed beam and 3 kinds of punching shear components were added.To verify the effectiveness of the above method,5 groups of punching shear tests of joints were conducted considering 4 different configuration schemes.The failure characteristics,displacement ductility,stress characteristics of reinforcement and concrete were analyzed.The test results show that compared with specimen without the concealed beam,the configuration of the concealed beams can improve the ultimate bearing capacities of the thick slab⁃column joints,and increase the circumference of the punching ring and the ductility of the joints.AddingΠ⁃shaped studs or duck shaped bars can enhance the punching shear resistance capacities.Adding shaped steels inside the concealed beams not only can increase the punching shear bearing capacity of thick slab⁃column joints,but also significantly improve the ductility of the joints.However,the obvious punching ring did not appear.Finally,based on the experimental results,an estimation formula for the punching shear bearing capacity of thick slab⁃column joints with shallow beams was proposed in order to provide references for revising the code.

关 键 词：厚板柱节点 暗梁 抗冲切性能 试验研究 估算公式 

分 类 号：TU398.1[建筑科学—结构工程] TU317.1