托换对津滨轻轨桥梁抗震性能的影响分析
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摘要
以津滨轻轨桥墩托换工程为研究对象,考虑桩-土共同作用,运用ANSYS分析托换前与托换后结构的自振特性,并采用反应谱法和时程分析法计算托换前及托换后桥梁结构的地震反应。结果表明,托换后的桥梁结构基本周期比托换前减小了,地震荷载作用下,桥梁墩底特别是托换桥墩底部的最大剪力值和弯矩值较托换前大幅增加,而墩顶位移最大值则大幅减小,说明托换使得桥梁结构的整体刚度增加了,托换后的桥梁结构体系具有较好的抗震性能。
The pier-underpinning of Jin-bin mass transit is taken as the research object,and ANSYS software is used in the vibration characteristics and dynamic responses analysis and pile-soil common function is considered in the numerical simulation.The response spectrum method and time history method are used to calculate the dynamic responses of the bridge structure before and after the pier-underpinning.The results show that the basic cycle of the bridge structure becomes smaller,and the maximum shear values and the maximum bending moment values of the piers bottom increase,but the maximum deflection values of the piers top decrease after the pier-underpinning.Thus the pier-underpinning improves the stiffness and seismic performance of the bridge structure system.
The pier-underpinning of Jin-bin mass transit is taken as the research object,and ANSYS software is used in the vibration characteristics and dynamic responses analysis and pile-soil common function is considered in the numerical simulation.The response spectrum method and time history method are used to calculate the dynamic responses of the bridge structure before and after the pier-underpinning.The results show that the basic cycle of the bridge structure becomes smaller,and the maximum shear values and the maximum bending moment values of the piers bottom increase,but the maximum deflection values of the piers top decrease after the pier-underpinning.Thus the pier-underpinning improves the stiffness and seismic performance of the bridge structure system.
引文
[1]范立础.桥梁抗震[M].上海:同济大学出版社,1997.
[2]中华人民共和国铁道部.GB50111—2006铁路工程抗震设计规范[S].北京:中国铁道出版社,2006.
[3]朱永生,劳远昌,沈大元,等.桥梁地震反应分析中输入地震波的确定[J].桥梁建设,2000(3):1-4.
[4]李光辉.大跨度连续刚构桥空间地震反应分析[D].四川:西南交通大学土木工程学院,2005.
[2]中华人民共和国铁道部.GB50111—2006铁路工程抗震设计规范[S].北京:中国铁道出版社,2006.
[3]朱永生,劳远昌,沈大元,等.桥梁地震反应分析中输入地震波的确定[J].桥梁建设,2000(3):1-4.
[4]李光辉.大跨度连续刚构桥空间地震反应分析[D].四川:西南交通大学土木工程学院,2005.
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