装配式地下车站CHC型钢混凝土组合接头受弯性能分析
叶亮1丁先立1项宝1赵维刚2吴居洋1欧飞奇1昝子卉1
Bending Performance of CHC Steelconcrete Combined Joint in Underground Prefabricated Metro Station
YE LiangDing XianliXiang BaoZhao WeigangWu JuyangOu FeiqiZan Zihui
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作者信息:1.广州地铁设计研究院股份有限公司， 510030, 广州;
2.石家庄铁道大学土木工程学院, 050043, 石家庄
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Affiliation:Guangzhou Metro Design & Research Institute Co., Ltd., 510030, Guangzhou, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2022.04.026
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中图分类号/CLCN:TU398+.9：U231.4
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栏目/Col:研究报告
摘要:
新型CHC(C型钢+H型钢+C型钢)型钢混凝土组合接头结合了预制混凝土预埋和型钢安装工艺。基于某装配式地下车站，对CHC型钢混凝土组合接头试验梁进行四点弯曲足尺加载试验，测量试验荷载、接头竖向位移、表面混凝土应变以及型钢后锚固钢筋的应力分布，进而研究CHC型钢混凝土组合接头的受弯性能。研究结果表明：CHC型钢混凝土组合接头的力学性能符合刚性接头特征；试验梁在极限荷载时的破坏模式符合适筋破坏形态，且破坏之前有明显的预兆；梁体截面刚度随着荷载增加而降低；组合接头的混凝土凸榫凹槽构造对受压区混凝土产生约束作用，提高了接头附近的受压混凝土高度；接头锚固钢筋间应力分布的均匀程度呈先上升后下降的趋势，并在屈服阶段再次提高；型钢混凝土组合接头总体协同性较高，呈现良好的整体力学性能。
Abstracts:
A new type of CHC steelconcrete(C steel+H steel+C steel) joint combines prefabricated concrete and steel installation process. Based on certain underground prefabricated station, fourpoint bending fullscale loading test is carried out on the test beam with CHC steelconcrete joint, measuring the test load, the vertical displacement of the joint, the surface concrete strain and the stress distribution of the anchored steel bar, and the bending performance of CHC steelconcrete joint is further studied. Research results show that the mechanical properties of the CHC steelconcrete joint conform with that of rigid joints. The damage pattern under extreme load of test beam conforms with that of reinforced beams, which is obviously indicated before it taking place. The section stiffness of test beam decreases as the load increases. Concretes in the compressive zone are constrained by the tenongroove structure of joint, therefore depth of compressive concrete zone of joint increases. The distribution evenness of the anchored steel bars stress shows trend of increasing first then decreasing, and then increasing again in the yielding phase. The general coordination of steelconcrete joint is high, demonstrating good overall mechanical performance.
引文 / Ref:
叶亮, 丁先立, 项宝, 等. 装配式地下车站CHC型钢混凝土组合接头受弯性能分析. 城市轨道交通研究, 2022, 25(4): 120.
YE Liang, Ding Xianli, Xiang Bao, et al. Bending performance of CHC steel-concrete combined joint in underground prefabricated metro station. Urban Mass Transit, 2022, 25(4): 120.
YE Liang, Ding Xianli, Xiang Bao, et al. Bending performance of CHC steel-concrete combined joint in underground prefabricated metro station. Urban Mass Transit, 2022, 25(4): 120.
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