索梁结构应急桥非线性静风稳定性分析  

Nonlinear Aerostatic Stability Analysis for Emergency Bridge with Cable-Girder

作　　者：杨磊[1] 宋殿义[1] 邵飞 YANG Lei;SONG Dianyi;SHAO Fei(College of Military Basic Education,National University of Defense Technology,Changsha 420072,China;College of Field Engineering,Army Engineer University of PLA,Nanjing 210007,China)

机构地区：[1]国防科技大学军事基础教育学院,长沙410072 [2]陆军工程大学野战工程学院,南京210007

出　　处：《铁道建筑》2021年第7期11-16,25,共7页Railway Engineering

基　　金：国防科技大学科研计划项目(ZK20-50);装备预先研究项目(30110010403)。

摘　　要：受跨度限制,军用桥梁装备难以快速完成百米级应急工程保障任务,而新型索梁结构应急桥可以满足相应的机动工程保障需求。采用非线性静风稳定性分析方法,基于ANSYS APDL编制非线性静风分析程序,计算新型索梁结构应急桥的静风极限风速,并分析铰接非线性、初始风攻角、抗风缆、车辆对静风极限风速的影响。结果表明:应急桥在风荷载作用下产生了较大的扭转变形,但在达到结构变形极限状态时仍未出现发散失稳现象,据此提出以静风极限风速判定桥梁结构的静风临界风速;随着初始风攻角的增大,应急桥静风极限风速减小,负攻角静风稳定性优于正攻角;90°抗风缆方案静风极限风速最大,其值为37.5 m/s;铰接非线性和车辆对索梁结构应急桥静风极限风速的影响不可忽略。随着桥梁结构阻尼比的增大,静风极限风速稍有增大,作用不显著。It is difficult for military bridge equipment to complete the hectometer emergency engineering support task quickly due to limited span,and the emergency bridge with new-type cable-girder can meet the corresponding mobile engineering support requirements.Taking the emergency bridge with new-type cable-girder as the research object,the static wind stability was studied.Based on ANSYS APDL,the nonlinear static wind stability analysis program was compiled to calculate the static wind speed limit of emergency bridge with cable-girder,and analyze the influence of hinge nonlinearity,initial wind attack angle,wind resistant cable and vehicle on the static wind speed limit of emergency bridge.The results show that the emergency bridge appears large torsional deformation under wind load,the bridge instability do not appear when the bridge structure achieve the deformation limit state,so the static wind speed limit was put forward to judge as critical wind speed of static wind.With the wind attack angle increase,the static wind speed limit decrease,the static wind stability of the negative wind attack angle is better than that of the positive wind attack angle.The maximum static wind speed of 90°wind resistant cable is 37.5 m/s.The influence of hinge nonlinearity and vehicle on the static wind speed limit of emergency bridge with cable-girder can not be neglected.With the increase of damping ratio of bridge structure,the static wind speed limit slightly increases,but the effect is not significant.

关 键 词：索梁结构应急桥 风洞试验 数值模拟 风攻角 铰接 静风极限风速 

分 类 号：U448.25[建筑科学—桥梁与隧道工程] U441.3[交通运输工程—道路与铁道工程]