装配整体式地下车站钢管混凝土柱型钢混凝土-叠合梁节点力学性能研究
邢琼
Joint Mechanical Properties of Concretefilled Steel Tube Columns and Steelconcrete Composite Beams in Assembled Monolithic Underground Station
XING Qiong
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作者信息:中铁第四勘察设计院集团有限公司， 430063， 武汉
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Affiliation:China Railway Siyuan Survey and Design Group Co., Ltd., 430063, Wuhan, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.07.011
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中图分类号/CLCN:TU311： U231.4
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栏目/Col:研究报告
摘要:
目的：为了保障新型节点的传力有效性与车站安全性，需对城市轨道交通装配式车站的新型钢管混凝土柱型钢混凝土叠合梁节点的力学性能进行研究。方法：针对车站正常使用阶段，建立足尺模型；采用原位对拉方式加载，研究新型钢管混凝土柱型钢混凝土叠合梁节点静载作用下的力学性能；结合力学试验结果，利用ANSYS软件中的纤维单元建立数值分析模型，对影响节点受力性能的重要参数进行分析。结果及结论：节点连接区的破坏形态为靠近柱端受压区位置部分混凝土压碎剥落，梁顶的裂缝增多并发展；通过荷载位移曲线及应变分析验证了节点的破坏是经过了裂缝出现、屈服变形和塑性变形等几个阶段，力学试验表明预制混凝土、现浇混凝土和型钢的粘结良好并共同工作,节点具有良好的整体性能；通过数值模拟及其参数分析可得出，叠合梁节点的混凝土强度等级增加可使承载力提高，但延性降低，节点型钢的翼缘宽度对承载力及刚度的影响很小。
Abstracts:
Objective: To ensure that the force transmission by the new type joints is effective and the station safety is secured，the mechanical properties of new type joints of CFST (concretefilled steel tube) column and SCCB (steelconcrete composite beam) for urban rail transit assembled monolithic underground station are studied. Method: A fullscale model is built for the stationin in normal service stage; A dopting insitu tensile loading method, the mechanical properties of the CFST columnSCCB joint under static load is studied; Combined with the mechanical test results, a numerical analysis model is established using fiber units in ANSYS software, and the major parameters of joint stress performance are analyzed.Result & Conclusion: The failure mode of the joint connection area is that the concrete at the column end is crushed and peeled off due to compression, and more cracks developed and propagated at beam top; the loaddisplacement curve and strain analysis verify that the joint failure developed during stages of crack appearance, yield deformation and plastic deformation, and that the prefabricated concrete, insitu concrete and steel are well bonded, indicating good overall performance of the joint. Through numerical simulation and parameter analysis, it can be derived that the strength grade increase of concrete at composite beam joint leads to increased bearing capacity but decreased ductility, and that the flange width of the joint steel has little effect on the bearing capacity and stiffness.
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