东南大学学报（自然科学版）Issue(5)：986-992,7.DOI:10.3969/j.issn.1001-0505.2013.05.015
基于实测与规范风谱的三塔悬索桥抖振性能对比
Comparable study on buffeting performance of triple-tower suspension bridge based on measured wind spectrum and specification wind spectrum
摘要
Abstract
In order to describe the buffeting performance of a triple-tower suspension bridge, com-parative study on buffeting was conducted with measured wind spectrum and the specification wind spectrum.Based on the field measurements and database of the structural health monitoring system at Runyang Bridge and Sutong Bridge, the wind spectrum ( measured spectrum) from the measured strong wind was obtained by the nonlinear least square method.As the longest-span triple-tower sus-pension bridge in the world, Taizhou Yangtze River Bridge with the main span of 1 080 m was taken as the example.After the 3D turbulence wind field was simulated by considering the measured spec-trum and the specification spectrum as the target spectrum respectively, comparable analyses on the buffeting response of the triple-tower suspension bridge were carried out based on ANSYS.The re-sults show that these two kinds of buffeting displacement PSD( Power Spectrum Density) curves of the main girder change with the same trend, and the first order vibration mode in each direction con-tributes mostly to the buffeting response.The RMS distribution of the lateral buffeting displacement along the span of the triple-tower suspension bridge is mainly the same as those of two-tower suspen-sion bridges, while the RMS( Root Mean Square) distribution of the vertical and torsional buffeting displacement shows its own characteristics.The buffeting responses with the measured spectrum are smaller and those from the specification spectrum are therefore conservative.The results can provide references for wind-induced buffeting analysis of the bridge and wind resistant design of other bridges in the same type.关键词
规范谱/实测谱/三塔悬索桥/抖振响应/时域分析Key words
specification spectrum/measured spectrum/tripe-tower suspension bridge/buffeting response/time-domain analysis分类
交通工程引用本文复制引用
王浩,陶天友,郭彤,李爱群,邓稳平..基于实测与规范风谱的三塔悬索桥抖振性能对比[J].东南大学学报（自然科学版）,2013,(5):986-992,7.基金项目
国家自然科学基金资助项目（51378111）、江苏省交通科学研究计划资助项目（2011Y03-7）、江苏省高校优势学科建设工程资助项目、东南大学优秀青年教师资助计划资助项目、同济大学桥梁结构抗风技术交通行业重点实验室开放课题资助项目（ KLWRT-BMC12-02）． （）
