加固后轻型刚架拱桥的空间有限元动力分析方法
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摘要
对采用粘贴钢板法加固既有轻型刚架拱桥的动力特性进行研究。文中先以拱桥组成构件为例对传统的有限元法的构件动力分析中性轴、中性面计算假定位置与实际位置偏差而引起结构动力特性参数计算结果的人为误差进行了比较。继而提出解决该人为误差的有效方法,把拼装成桥的整座轻型刚架拱桥按组成构件离散,对主要受力构件的动力特性及其加固后的动力特性的理论计算分析方法进行深入探讨,提出采用弹性面力来代替粘贴钢板,并把弹性面力简化为结构单元结点弹性支承的方法来考虑拱肋及粘贴钢板之间的共同作用,以此来克服传统的有限元分析法中构件中性轴、中性面计算假定位置与实际位置偏差的问题。并通过轻型刚架拱桥动力特性参数的实测来检验本文提出的改进空间有限元动力分析法的可靠性和实用性。
The dynamic properties of arch bridge which was enforced by method of affixing steel plate were studied in this dissertation,and some conclusion was drawn.The dissertation hold "disassembling then assembling" as theoretical quintessence of finite-element method,and the whole arch bridge was disassembled to several components.Following on study on dynamic properties of the typical components,especially to the properties changed after enforcement of arch bridge,affixing steel plate was assumed to be replaced by elasticity distribution pressure,so that the coordinated action of arch rib between steel plates was considered by simplifying this elasticity distribution pressure into elasticity brace.Some problems of the bias caused by supposed position during structure analysis between practicality positions would be solved.The result error caused by the bias of position was estimated,and the data of dynamic bridge testing was used to test the spacious analysis.
The dynamic properties of arch bridge which was enforced by method of affixing steel plate were studied in this dissertation,and some conclusion was drawn.The dissertation hold "disassembling then assembling" as theoretical quintessence of finite-element method,and the whole arch bridge was disassembled to several components.Following on study on dynamic properties of the typical components,especially to the properties changed after enforcement of arch bridge,affixing steel plate was assumed to be replaced by elasticity distribution pressure,so that the coordinated action of arch rib between steel plates was considered by simplifying this elasticity distribution pressure into elasticity brace.Some problems of the bias caused by supposed position during structure analysis between practicality positions would be solved.The result error caused by the bias of position was estimated,and the data of dynamic bridge testing was used to test the spacious analysis.
引文
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[2]R.D.库克.有限元分析的概念和应用[M].北京:科学出版社,1989.
[3]人民交通出版社.公路桥涵设计规范(合订本)[M].北京:人民交通出版社,1995.
[4]谢贻权、何保福.弹性和塑性力学中的有限元法[M].北京:机械工业出版社,1983.
[5]李国豪.桥梁结构稳定与振动[M].北京:中国铁道出版社,1996.
[6]何度心.桥梁振动研究[M].北京:地震出版社,1989.
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