装配式UHPC空心墩的内浇式组合连接压弯试验研究  

Compressive and bending test of assembled UHPC hollow pier using internal delayed casted composite connection

作　　者：袁星 周涌昊 谭舜 邓开来 金龙 周亮 YUAN Xing;ZHOU Yonghao;TAN Shun;DENG Kailai;JIN Long;ZHOU Liang(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;China 19th Metallurgical Corporation,Chengdu 610031,China;China State Construction Bridge Co.,Ltd.,Chongqing 402260,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]中国十九冶集团有限公司,四川成都610031 [3]中建桥梁有限公司,重庆402260

出　　处：《世界地震工程》2024年第4期112-120,共9页World Earthquake Engineering

基　　金：国家自然科学基金(52078436);四川省科技计划项目(2023ZDZX0010,2023YFG0064);重庆市交通科技项目(CQJT-CZKJ2024-11)。

摘　　要：为了促进超高性能混凝土(ultra-high-performance concrete,UHPC)在桥梁中的应用,提升装配式桥墩的建造效率,本文提出了针对装配式UHPC空心墩的内浇式组合连接,其主要特征在于:将预制UHPC空心墩与承台的搭接构造转移至空心墩的内部,利用墩壁作为内部后浇UHPC材料的模板,完全消除了施工现场的模板工程,后浇部分不出现在墩身表面,提升了桥墩的表观质量。为了探究该装配式UHPC空心墩的承载能力,设计并制作了3个模型试件,研究了其在压弯变形下的承载能力和损伤失效模式等。研究结果表明:该内浇式组合连接实现预制UHPC空心墩和承台的有效连接,但实现与现浇桥墩的等强构造需要精心设计剪力连接件的位置和承载力。基于试验结果,开发了装配式UHPC空心墩的数值模型,计算结果与试验较为吻合。基于数值建模方式,研究了内浇式组合连接在足尺UHPC空心墩的结构行为,并提出了能实现与现浇桥墩等强的内浇式组合连接设计方法。To promote the application of ultra-high-performance concrete(UHPC)in bridges and improve the construction efficiency of prefabricated bridge piers,this article proposes an in-cast composite connection for prefabricated UHPC hollow piers.Its main feature is to combine prefabricated UHPC hollow piers with the overlapping structure of the cap is transferred to the inside of the hollow pier,and the pier wall is used as a template for the internal post-cast UHPC material,which eliminates the formwork work at the construction site.The post-cast part does not appear on the surface of the pier body,improving the appearance of the pier.quality.To explore the load-bearing capacity of the assembled UHPC hollow pier,this article designed and produced three model specimens to study its load-bearing capacity,damage failure mode,etc.under bending deformation.Tests have shown that the cast-in composite connection can connect prefabricated UHPC hollow piers and caps effectively.However,achieving the same strength structure as the cast-in-place piers requires careful design of the location and bearing capacity of the shear connectors.Based on the test results,this paper developed a numerical model of the prefabricated UHPC hollow pier,and the calculation results are consistent with the tests.Based on numerical modeling methods,the structural behavior of cast-in-place composite connections in full-scale UHPC hollow piers was studied,and a design method for cast-in-place composite connections that could achieve the equivalent strength as cast-in-place piers was proposed.

关 键 词：装配式建造 UHPC空心墩 内浇式组合连接 滞回曲线 等强设计 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]