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[1]屈志浩,邵旭东,邱明红,等.装配式组合梁负弯矩区阶梯型UHPC接缝抗裂性能试验研究[J].建筑科学与工程学报,2024,41(05):1-13.[doi:10.19815/j.jace.2022.08024]
　QU Zhihao,SHAO Xudong,QIU Minghong,et al.Experimental study on crack resistance of stepped UHPC joints in negative moment zone of fabricated composite beams[J].Journal of Architecture and Civil Engineering,2024,41(05):1-13.[doi:10.19815/j.jace.2022.08024]
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装配式组合梁负弯矩区阶梯型UHPC接缝抗裂性能试验研究(PDF)
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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:
41卷
期数:
2024年05期
页码:
1-13
栏目:
建筑结构
出版日期:
2024-09-20

文章信息/Info

Title:
Experimental study on crack resistance of stepped UHPC joints in negative moment zone of fabricated composite beams
文章编号:
1673-2049(2024)05-0001-13
作者:
屈志浩1,邵旭东1,邱明红1,熊 伟2,贾贤盛2
(1. 湖南大学 土木工程学院,湖南 长沙 410082; 2. 中国市政工程中南设计研究总院有限公司,湖北 武汉 430010)
Author(s):
QU Zhihao1, SHAO Xudong1, QIU Minghong1, XIONG Wei2, JIA Xiansheng2
(1. College of Civil Engineering, Hunan University, Changsha 410082, Hunan, China; 2. Central & Southern China Municipal Engineering Design and Research Institute Co., Ltd, Wuhan 430010, Hubei, China)
关键词:
桥梁工程;  超高性能混凝土接缝;  试验研究;  组合梁负弯矩区;  裂缝分析
Keywords:
bridge engineering;  ultra-high performance concrete joint;  experimental study;  negative moment zone of composite beam;  crack analysis
分类号:
TU375
DOI:
10.19815/j.jace.2022.08024
文献标志码:
A
摘要:
为提高装配式组合梁负弯矩区桥面板抗裂性能,简化施工工艺,提出了组合梁桥负弯矩区阶梯型超高性能混凝土(UHPC)湿接缝方案。以湖北某装配式组合梁桥为背景,设计制作了1根1:2缩尺模型试件进行负弯矩加载,对阶梯型UHPC接缝抗裂性能进行试验研究。利用截面非线性计算方法对接缝区域钢筋应变进行非线性分析,基于分析结果,讨论了UHPC基体裂缝宽度实测值与规范计算值之间的差异。结果表明:试件破坏模式为纯弯段内钢梁底板屈曲破坏; 负弯矩作用下,钢梁与混凝土桥面板之间的最大滑移量为0.163 mm,接缝区域截面应变分布基本满足平截面假定,接缝与预制部分共同受力良好; UHPC与普通混凝土(NC)具有不同的裂缝分布特征,UHPC裂缝分布较密,而NC裂缝分布较疏; 接缝区域内,区域Ⅱ以及接缝截面裂缝发展较快,钢-UHPC截面抗裂能力强于钢-NC-UHPC截面; 试件接缝区域桥面板顶面裂缝宽度达到0.1 mm时,接缝界面名义应力超过12.8 MPa,安全系数达到了1.69; 非线性计算方法可以有效预测钢筋应变; 接缝区域UHPC基体裂缝宽度宜采用UHPC行业标准或法国UHPC规范进行计算,计算时宜考虑混凝土的抗拉贡献; 阶梯型UHPC接缝方案具有优异的安全与耐久性能,施工方便,能够满足实际工程需求。
Abstract:
In order to improve the crack resistance of deck slab in negative moment zone of assembled composite beam and simplify construction technology, a wet joint scheme of stepped ultra high performance concrete(UHPC)in negative moment zone of assembled composite beam bridge was proposed. Based on a fabricated composite beam bridge in Hubei province, a 1:2 scaled model specimen was designed and fabricated for negative bending moment loading, and the crack resistance of stepped UHPC joints was experimentally studied. The section nonlinear calculation method was used to carry out the nonlinear analysis of the steel strain in the joint area. Based on the analysis results, the difference between the measured value of UHPC matrix crack width and the calculated value of the specification was discussed.The results show that the failure mode of the specimen is the buckling failure of the steel beam floor in the pure bending section. Under the action of negative bending moment, the maximum slip between the steel beam and the concrete bridge deck is 0.163 mm, and the strain distribution of the cross section in the joint area basically meets the plane section assumption, and the joint and the precast part have good joint force. UHPC and normal concrete(NC)have different crack distribution characteristics. The crack distribution of UHPC is dense, while the crack distribution of NC is sparse. In the joint area, the crack development of zone Ⅱ and joint section is the fastest, and the crack resistance of steel-UHPC section is stronger than that of steel-NC-UHPC section. When the crack width at the top surface of the bridge deck in the specimen joint area is 0.1 mm, the nominal stress at the joint interface exceeds 12.8 MPa, and the safety factor reaches 1.69. The nonlinear calculation method can effectively predict steel strain. The crack width of UHPC matrix in the joint area should be calculated by UHPC industry standard or French specification, and the tensile contribution of concrete should be considered in the calculation of steel strain. The stepped UHPC joint scheme has excellent safety and durability, convenient construction and meets the actual engineering requirements.

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备注/Memo

备注/Memo:
收稿日期:2023-08-11
基金项目:国家自然科学基金重点项目(52038003)
通信作者:邵旭东(1961-),男,工学博士,教授,博士生导师,E-mail:shaoxd@vip.163.com。
更新日期/Last Update: 2024-09-30