大跨径钢箱梁在温度影响下的振型分析
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摘要
近年来,大跨径钢箱梁桥得到了飞速的发展,同时,在施工中发现温度对它的影响不容忽视.钢箱梁桥在太阳照晒下,箱梁顶部与底部会产生较大的温差,由此而产生的温度应力,会给该桥梁带来初始缺陷,并影响钢箱梁桥的振型变化.自振频率是桥梁结构动力特性的模态参数,也是评价桥梁动力性能的重要依据.以大跨度连续刚箱桥为例,进行建模分析,得出在温度荷载影响下的振型变化情况,对桥梁的设计与施工具有一定的参考价值.
In recent years,long-span steel box girder bridge obtained the rapid development,but the influence of temperature in the construction cannot be ignored.Because the top and bottom box can produce a larger temperature difference under the sunshine,arising temperature stress,which would induce the initial defects of bridge so as to affect vibration mode change of steel box girder bridge.Natural frequency of vibration is the dynamic characteristics of the bridge structure modal parameters,which is also the evaluation base of dynamic performance of the bridge.This paper,taking the large span continuous just box bridge as an example,set up an analysis model,specifying the vibration mode change under the temperature influence,which presented a reference to the bridge's design and construction.
In recent years,long-span steel box girder bridge obtained the rapid development,but the influence of temperature in the construction cannot be ignored.Because the top and bottom box can produce a larger temperature difference under the sunshine,arising temperature stress,which would induce the initial defects of bridge so as to affect vibration mode change of steel box girder bridge.Natural frequency of vibration is the dynamic characteristics of the bridge structure modal parameters,which is also the evaluation base of dynamic performance of the bridge.This paper,taking the large span continuous just box bridge as an example,set up an analysis model,specifying the vibration mode change under the temperature influence,which presented a reference to the bridge's design and construction.
引文
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[5]彭大文,陈昀明.钢筋混凝土加劲析架悬索桥的模态分析[J].地震工程与工程振动,2001,21(4):40-45.
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[7]项海帆.高等桥梁结构理论[M].北京:人民交通出版社,2002.
[2]李枝军,李爱群,韩晓林.润扬大桥悬索桥动力特性分析与实测变异性研究[J].土木工程学报,2010,43(4):92-98.
[3]屈爱平,高淑英.梁-墩-桩基的动力特性研究[J].西南交通大学学报,2001,36(6):641-644.
[4]孙正华,李兆霞.润扬斜拉桥有限元模拟及模态分析[J].地震工程与工程振动,2006,26(2):25-32.
[5]彭大文,陈昀明.钢筋混凝土加劲析架悬索桥的模态分析[J].地震工程与工程振动,2001,21(4):40-45.
[6]徐良,江见鲸,过静.广州虎门悬索桥的模态分析[J].土木工程学报,2002,35(1):25-34.
[7]项海帆.高等桥梁结构理论[M].北京:人民交通出版社,2002.
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