在役钢筋混凝土拱桥病害分析和力学性能研究
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摘要
结合某在役三跨钢筋混凝土拱桥结构的现场检测,对该拱桥结构的静、动力力学性能进行了有限元计算。获得了大桥静载下的变形信息和振动特性信息,为大桥的抗震、抗风分析建立了基础;通过验算荷载对布载最不利位置的检验,全面评估大桥的安全状态;通过静载实测的数值与有限元模型数值的对比,研究了拱桥的力学性能,评估分析了拱桥结构过早出现病害的主要原因,为在役拱桥的安全性评价和健康诊断提供了理论依据。
Safety evaluation and retrofitting strategies have become to be an urgent problem for large numbers of old bridges. To this end, it is necessary to have a good knowledge of the mechanical performance of damaged structures. Therefore, researches into the damage mechanism and mechanical performance of the reinforced concrete arch bridge are important and valuable. In this paper, based on damage measurement of an old three-span reinforced concrete arch bridge, the static and dynamic performance of the reinforced concrete arch bridge were numerically modelled by Finite Element Method (FEM). Deformation and vibration characteristic data, which contribute to aseismic analysis, are obtained. By locating the loads on the worst points, safety condition of the old bridge is roughly evaluated. Based on the comparison between the FEM and experiment results, the critical reasons which result in the premature damage of the bridge were analyzed, which will form a theoretical basis for the safety evaluation and health diagnosis of the bridges in service.
Safety evaluation and retrofitting strategies have become to be an urgent problem for large numbers of old bridges. To this end, it is necessary to have a good knowledge of the mechanical performance of damaged structures. Therefore, researches into the damage mechanism and mechanical performance of the reinforced concrete arch bridge are important and valuable. In this paper, based on damage measurement of an old three-span reinforced concrete arch bridge, the static and dynamic performance of the reinforced concrete arch bridge were numerically modelled by Finite Element Method (FEM). Deformation and vibration characteristic data, which contribute to aseismic analysis, are obtained. By locating the loads on the worst points, safety condition of the old bridge is roughly evaluated. Based on the comparison between the FEM and experiment results, the critical reasons which result in the premature damage of the bridge were analyzed, which will form a theoretical basis for the safety evaluation and health diagnosis of the bridges in service.
引文
1庄河市水利建筑勘察设计院 .英那河水库坝下大桥新建设计资料 , 2 0 0 2 .
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[1] 汪礼顺.重庆綦江虹桥坍塌事故的力学分析[J].江西科技,2000,18(1):58-59
[2] 张秀成,谢 奎,任毅勇.浅析"宜宾市小南门金沙江大桥"桥塌的原因与修缮方案[J],河南城建高等专科学校学报,2000,11(2):15-17
[3] JTJ021-89,公路桥涵设计通用规范[S]
[4] JTJ001-97,公路工程技术标准[S]
[5] JTJ022-85,公路砖石及混凝土桥涵设计规范[S]
[6] JTJ023-85,公路钢筋混凝土及预应力混凝土桥涵设计规范[S]
[7] 彭大文,陈明.钢筋混凝土加劲桁架悬索桥的模态分析[J].地震工程与工程振动,2001,21(4):40-45
[8] 张 哲,邱文亮,黄才良.铜瓦门大桥设计与稳定性研究[J].大连理工大学学报,2002,42(4):456-459
[9] 李国豪.桥梁结构稳定与振动[M].北京:中国铁道出版社,1992
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