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-  2018 

UHPC铺装加固斜拉桥正交异性钢桥面板
Reinforcement of orthotropic steel bridge deck for cable-stayed bridge based on UHPC paving system

Keywords: 桥梁工程,正交异性钢桥面板,加固,桥面铺装,超高性能混凝土,荷载试验
bridge engineering
,orthotropic steel bridge deck,reinforcement,bridge pavement,ultra-high performance concrete,load test

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Abstract:

针对正交异性钢桥面板存在的桥面铺装破损及钢桥面疲劳开裂这一系列问题,以长期被该病害困扰的天津海河大桥为研究对象,分析此类病害的分布特征及产生机理;根据病害形成的原因提出采用超高性能混凝土铺装层(UHPC)与钢桥面通过剪力钉形成组合结构的加固方法,并将该方法首次应用于大跨径斜拉桥的加固;基于有限元计算和加固前后实桥比对试验,对UHPC层及桥面板关键部位应力情况进行分析,并连续2年对加固后桥梁的状况进行监测。研究结果表明:桥梁病害产生的主要原因是自身刚度不足,在重载车辆的长期作用下出现疲劳开裂;采用UHPC铺装加固后,钢桥面转变成钢-UHPC组合桥面,可大幅度提高桥面板整体刚度,其受力状态得到明显改善,钢箱梁U肋、横隔板、顶板在标准车荷载下的应力分别降低52.7%、39.2%、28.3%,UHPC铺装加固能有效抑制疲劳裂缝的产生和发展,UHPC材料的抗拉强度能满足活载作用下最大拉应力的要求;在重载交通的运营状况下桥面铺装依旧完好,钢箱梁无新增裂缝。采用UHPC铺装加固正交异性钢桥面板在改善其受力状况方面具备优越性和技术可行性。
The damage of pavement and fatigue cracks are the common problems in orthotropic steel bridge deck. Based on the Haihe Bridge of Tianjin which had been troubled by the disease mentioned above for a long time, the distribution characteristics and the main causes of the disease were analyzed. According to the main causes of the disease, a reinforcement method of using the ultra-high performance concrete (UHPC) was presented, which formed a composite structure with bridge deck by shear studs. The method was firstly applied to the reinforcement of long span cable-stayed bridges. Based on the finite element analysis and the real bridge comparison test before and after the reinforcement of the bridge, the stress situation of the key parts of the UHPC layer and the bridge panel was analyzed. And then the condition of the reinforced bridge was monitored for two years. The results show that the major cause of the bridge diseases was its weak stiffness, the fatigue cracks occur under the long-term action of heavy vehicle. The steel bridge deck changes into composite bridge deck after reinforcement, whose stiffness increases significantly, and the structural force conditions are obviously improved. The stress of the U ribs, the diaphragm and the deck-plate is declined by 52.7%, 39.2% and 28.3% respectively. UHPC pavement reinforcement can effectively inhibit the generation and development of fatigue cracks, and the tensile strength of the UHPC can satisfy the required maximum stress. The monitoring shows that the pavement is still in good condition and the steel box girder has no new cracks under the operating condition of heavy traffic. The reinforcement method of using UHPC pavement to the orthotropic steel bridge deck bridge has superiority and technical feasibility in improving its stress condition

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