桥梁非线性动力响应方法及volterra级数非线性方法探讨
2018-11-07冉晴扈小云扈玥昕
冉晴 扈小云 扈玥昕
摘 要:强震下桥梁的破坏和倒塌,造成的人员伤亡和经济社会效益是不容忽视的;另一方面,随着桥梁结构体系越来越复杂和延性抗震设计理念的转变,都使得桥梁非线性抗震验算越来越受到工程师的重视。本文回顾了桥梁非线性动力学问题的发展,总结了目前桥梁非线性抗震验算方法的优、缺点,着眼于非线性系统理论及最新成果,通过volterra级数在非线性系统理论中的成果,探讨了volterra级数在桥梁工程的运用的可行性及优越性,并提出了volterra級数运用于桥梁结构的关键性问题。
关键词:桥梁;非线性动力学;volterra级数;非线性频率响应函数
Abstract: The next earthquake damage and collapsed bridges caused casualties and economic and social benefits that can not be ignored; hand, with the bridge structure system more complex and changing ductility seismic design philosophy that have made non-linear bridge seismic checking more and more attention of engineers. This paper reviews the development of the nonlinear dynamics of the bridge, the bridge excellent summary of the current method of nonlinear seismic check, disadvantages, focusing on non-linear system theory and the latest results, outcomes through volterra series of nonlinear systems theory to explore volterra progression in the use of the bridge project feasibility and superiority, and made a series of key questions volterra applied to the bridge structure.
Keywords: bridge; nonlinear dynamics; volterra series; nonlinear frequency response function
1.引言
我国广阔、复杂的地貌,造就了多山多河的地形,为了方便人们的出行,桥梁作为可以跨谷跨河的工程结构物得到了广阔的发展。其中桥梁动力学问题分析作为桥梁分析中重要的一环,关系到桥梁功能的正常使用和生命财产安全,被研究学者和设计工程师重点关注着。在2008年我国汶川8.0级地震,有24条高速公路、6140座桥梁受损,导致了69225人遇难,4600多万人受灾[1],造成难以估计的损失。只进行桥梁线性动力分析已经不满足需求,因此破坏性地震下桥梁的非线性动力验算愈来愈得到工程人员的重视。另一方面,现代桥梁体系延性设计的理念的转变、减隔震支座的采用和大量大跨桥梁复杂新体系的出现,都决定着桥梁非线性动力响应分析的必要性。
2.桥梁非线性动力响应发展
经过了……
