双拱塔斜拉桥动力特性参数分析  

Analysis of Parameters for Dynamic Performance of Double Arch Tower Cable-stayed Bridge

作　　者：康俊涛[1] 别思汗 邵光强[1] 秦世强[1] 曹鸿猷[1] 

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉市430070

出　　处：《公路》2017年第4期88-94,共7页Highway

基　　金：国家自然科学基金项目;项目编号51408449;湖北省自然科学基金项目;项目编号2015CFB393

摘　　要：为研究双拱塔斜拉桥结构参数对桥梁动力特性的影响,以武汉科技三路桥为工程背景,基于Midas/Civil平台建立主桥空间有限元模型,采用多重Ritz向量法进行动力特性计算,分析了有无横撑、有无纵向拉索、结构自重、结构刚度、矢跨比等参数变化对该桥动力特性的影响。结果表明,该桥主要振型依次为拱塔扭转、主梁竖弯、主梁横弯振型。横撑对拱塔扭转振型频率影响较大;纵向拉索对各阶振型无影响;主梁自重对主梁竖弯、横弯振型频率影响显著,拱塔自重对拱塔扭转频率影响显著;拉索自重对各阶振型频率影响较小;结构刚度对各阶振型影响与结构自重影响相同;矢跨比对拱塔扭转振型频率影响较大。To study the influence of the structural parameters of double arch tower cable-stayed bridge on the dynamic performance, Wuhan Keji Third Road Bridge is analyzed and a spatial finite element model for main bridge is established on the platform of the software Midas civil 2013. Multiple Ritz vector method is used to carry out the dynamic calculation and the influences of the parametric change of whether lateral brace or not, whether longitudinal cable or not, structural weight, structural stiffness and rise-to-span ratio on the dynamic performance. The results demonstrate that the main modes of the bridge are arch tower torsional vibration mode, girder vertical bending mode and girder crosswise bending mode; lateral brace has great influence on the frequencies of arch tower torsional vibration mode; longitudinal cable has no affect on any vibration mode; the influence of weight of girder on girder vertical bending mode and crosswise bending mode is significant ; the weight of arch tower mainly affect arch tower torsional vibration mode; the weight of cable has no affect on any vibration mode; The stiffness of structure has the same trend of influence on the all vibration modes with the structural weight; and the influence of rise-span ratio on arch tower torsional vibration mode is great.

关 键 词：拱塔斜拉桥 参数分析 动力特性 自重 刚度 矢跨比 分析 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]