山区峡谷非定常风场特性及对悬索桥气动稳定性能的影响

项目名称： 山区峡谷非定常风场特性及对悬索桥气动稳定性能的影响

项目编号： No.51208067

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 建筑环境与结构工程学科

项目作者： 李春光

作者单位： 长沙理工大学

项目金额： 25万元

中文摘要： 当桥梁跨越深山峡谷地形时，桥址处风场具有显著的非定常时空特性，而此类地形条件下的风场特性及其引起的桥梁气动稳定性研究还较为薄弱，各国规范中关于山区峡谷地形桥梁抗风设计的条文远不能满足实际需要。随着西部大开发战略的深入实施，越来越多的跨越深山峡谷的大跨度悬索桥将被修建，这对明确峡谷风场特性及其作用下的大跨悬索桥气动稳定性提出了迫切要求。本项目拟以主跨856m的澧水特大悬索桥桥址峡谷风场与主梁风致响应同步监测系统为依托，由实测风场数据给出桥址峡谷风场特性的定量描述，研究紊流谱及空间相关性的合理取值，并以此为目标，实现峡谷风场特性的风洞及数值模拟；在风洞模拟风场中，借助主梁节段的气弹拉条模型测压测振试验分析紊流风场对抖振力及自激力展向相关性的影响形式；采用时域有限元法进行峡谷风作用下大跨悬索桥气动稳定性分析，由实测的主梁响应检验时域分析结果，并对其进行精细化改进，为类似桥梁的抗风设计提供参考。

中文关键词： 山区峡谷风场；悬索桥；气动力相关性；风洞试验；时域分析

英文摘要： When bridge spans wide valley in mountainous terrain, wind field at the bridge site exhibit remarkable non-stationary spatio-temporal characteristics. Researches about the wind field characteristic and the aerodynamic stability of bridge at such valley terrain are relatively weak. The regulations about wind resistant design of bridge at mountainous valley terrain in the codes of every countries are far to meet the requirements. With the promotion of west development, more and more long-span suspension bridges will be built to span the valleys in mountainous terrain. This put forward urgently requirements on the clear understand of wind field characteristics in valley terrain and its effect on the aerodynamic stability of suspension bridge. Based on the wind field and deck response monitoring system of Lishui super span suspension bridge with main span of 856m, quantitative descriptions of wind field characteristics at valley site will be given by the analysis of data from field measurement, and the reasonable values for the power spectrum and spatial correlation of wind field will be studied, then take those analysis results as targets, the wind field at valley site can be simulated by wind tunnel test and CFD simulation; wind tunnel test of taut strip model of part of the main beam will be carried out to study

英文关键词： Mountainous valley wind field；suspension bridge；correlations of aerodynamic forces；wind tunnel test；time domain analysis