摘要
为综合解决正交异性钢桥面板疲劳开裂和桥面铺装易损两大难题,提出一种由波形顶板、超高性能混凝土(ultra-high-performance concrete,UHPC)结构层和改进螺旋线(modified clothoide,MCL)形组合销所构成的新型波形顶板-UHPC组合桥面结构。设计2类共12个足尺模型,对所提出的新型波形组合桥面板在正、负弯矩作用下的抗弯性能开展试验研究。在此基础上,基于材料本构关系和内力平衡方程,建立新型波形组合桥面板的初始开裂弯矩、名义开裂弯矩和抗弯极限承载力的理论分析方法,通过模型试验对理论分析方法的适用性进行验证。结果表明:在正、负弯矩作用下,结构的破坏形式均为弯曲破坏并表现出良好的延性特征;消除钢-UHPC界面摩擦将劣化结构在正、负弯矩作用下的抗弯性能,抗弯极限承载力降低幅值分别为4.3%和4.2%,纵向配筋率是负弯矩作用下结构抗弯性能的另一个关键影响因素,抗弯极限承载力降低幅值为7.6%;所建立的理论分析方法物理含义明确,理论分析结果与试验结果吻合较好,可为新型波形顶板-UHPC组合桥面板的结构设计和抗弯承载能力分析提供理论依据。
To comprehensively solve the two challenges of the fatigue crack of orthotropic steel decks and the vulnerability of bridge deck pavement,the innovative corrugated steel-UHPC composite bridge decks consisting of UHPC,corrugated steel deck,and MCL-shaped composite dowels were proposed.Two types of 12 full-scale models were designed and tested to investigate the flexural behaviors of the proposed innovative corrugated composite bridge decks under the actions of sagging and hogging moments,respectively.Based on the material constitutive relationship and internal force balance equation,the theoretical analysis method was established for the initial cracking moment,nominal cracking moment and ultimate bending capacity of the innovative corrugated composite bridge decks.Furthermore,the applicability of the theoretical analysis method was verified by the model test results.The results show that under the actions of sagging and hogging moments,the failure modes of all the test models appear to be the flexural failure and good ductility characteristic can be observed.Eliminating the steel-UHPC interface friction weakens the flexural behavior of the structure under the actions of sagging and hogging moments,and reduces the ultimate bending capacity by 4.3%and 4.2%,respectively.The longitudinal reinforcement ratio is another key factor affecting the flexural behavior under the action of hogging moment,and the ultimate bending capacity can be decreased by 7.6%.The theoretical analysis method has clear physical meaning and the theoretical results agree well with the test results.The research can provide the theoretical basis for the structuraldesign and analysis of bending capacity of the innovative corrugated steel-UHPC composite bridge decks.
作者
张清华
程震宇
邓鹏昊
李明哲
魏川
Zhang Qinghua;Cheng Zhenyu;Deng Penghao;Li Mingzhe;Wei Chuan(Southwest Jiaotong University,Chengdu 610031,China)
出处
《土木工程学报》
EI
CSCD
北大核心
2022年第3期47-64,共18页
China Civil Engineering Journal
基金
国家自然科学基金(51778533,51578455,51878561,51978579)
桥梁结构健康与安全国家重点实验室开放课题(BHSKL19-06-KF)
广东省重点领域研发计划(2019B111106002)
四川省科技计划(2021YJ0037)。
