体外预应力加固重载铁路盖板涵试验研究

发布时间：2019-07-31 20:30

【摘要】：目前大秦铁路运输荷载日趋增加,桥梁的既有损伤不断加重,桥梁不断老化,破损。通过既有盖板涵承载力评估可知,盖板涵混凝土压应力已经超出规范要求。为了改善盖板的受力性能,提高盖板的承载能力,对盖板进行体外预应力加固。根据已加固盖板的室内静载试验和200万次疲劳试验,结合数据研究体外预应力的加固效果。结果表明,体外预应力加固可以大幅度提高盖板的承载能力,在正常使用状态混凝土压应力最大降低约32%。最后,根据力学理论推导体外筋应力增量计算公式,借助试验结果验证理论计算的准确性,为体外预应力加固的实际施工提供理论指导。
[Abstract]:At present, the transportation load of Daqin Railway is increasing day by day, the existing damage of bridge is increasing, and the bridge is aging and damaged. Through the evaluation of the bearing capacity of the existing cover culvert, it can be seen that the compressive stress of the concrete of the cover slab culvert has exceeded the requirements of the code. In order to improve the mechanical properties of the cover plate and improve the bearing capacity of the cover plate, the external prestress reinforcement of the cover plate is carried out. According to the indoor static load test and 2 million fatigue tests of the strengthened cover plate, the reinforcement effect of external prestress is studied with the data. The results show that the external prestress reinforcement can greatly improve the bearing capacity of the cover plate, and the compressive stress of concrete can be reduced by about 32% in normal use. Finally, according to the mechanical theory, the stress increment formula of the outer reinforcement of the conductor is deduced, and the accuracy of the theoretical calculation is verified by the test results, which provides theoretical guidance for the actual construction of external prestress reinforcement.
【作者单位】：兰州交通大学土木工程学院;
【基金】：长江学者和创新团队发展计划资助(IRT1139) 铁道部科技研究开发计划项目(2012G011-A)
【分类号】：U445.72;U239.4

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