摘要
为了解决正交异性桥面板铺装破坏和钢桥面板开裂的问题,提出一种常温养护下正交异性钢板-活性粉末混凝土(RPC)组合桥面结构体系。基于某大桥建立局部有限元模型,并计算对比常温RPC组合箱梁、纯钢箱梁、高温RPC组合箱梁和普通混凝土组合箱梁的桥面系应力状态;同时开展局部模型静载试验。研究结果表明:常温养护下RPC抗压强度、抗折强度和弹性模量与普通混凝土相比有明显的提高;常温养护的RPC组合箱梁的RPC层拉应力达到了6.45 MPa,未出现裂缝,此应力远高于普通混凝土的抗拉强度,从而为解决桥面铺装破坏提供了思路;常温RPC组合箱梁和高温RPC组合箱梁桥面板应力降幅都超过了80%,明显大于普通混凝土组合箱梁,从而改善桥面板疲劳性能。常温养护的RPC在施工现场便于制作,应用前景较好。
In order to solve the problem of bridge deck pavement damage and steel bridge deck cracking,the orthotropic steel plate-reactive powder concrete(RPC) composite deck structure system under normal temperature is proposed.A local finite element model is established based on a bridge,and the stress states of the bridge systems in pure steel box girder,room temperature RPC composite box girder,high temperature RPC composite box girder and ordinary concrete composite box girder are calculated and compared.At the same time,local model static load test is carried out.The results show that the compressive strength,flexural strength and elastic modulus of RPC under normal temperature curing are obviously improved compared with ordinary concrete.The tensile stress of RPC composite boxgirder under normal temperature curing reaches 6.45 MPa with no crack in place.This stress is much higher than the tensile strength of the ordinary concrete,providing a means to solve the bridge pavement failure.The deck stress drops of both the RPC composite box girder under normal temperature curing and the RPC composite box girder under high temperature curing exceed 80%,and are obviously greater than that of the ordinary concrete composite box girder,which greatly improves the fatigue life of the bridge deck.Meanwhile,RPC at room curing temperature is made conveniently at the construction site and will see extensive application.
作者
高展
张慧
靳春玲
GAO Zhan;ZHANG Hui;JIN Chun-ling(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou,730070,China)
出处
《铁道标准设计》
北大核心
2019年第3期85-89,共5页
Railway Standard Design
基金
国家自然科学基金(51508255
51669010)
甘肃省自然科学基金(17JR5RA105
1506RJZA082)
甘肃省陇原创新人才扶持计划(2520030802)
人社部留学回国人员择优资助项目(595203105)
关键词
正交异形钢桥板
常温养护
活性粉末混凝土
疲劳开裂
有限元
Orthotropic steel deck
Normal temperature curing
Reactive powder concrete
Fatigue crack
Finite element
作者简介
高展(1992—),男,山东菏泽人,硕士研究生,主要从事桥梁结构理论及应用研究工作,E-mail:gz3713@163.com;通信作者:张慧(1979—),女,甘肃兰州人,教授,博士,主要从事桥梁结构理论及应用研究工作,E-mail:252757963@qq.com。
