大跨径波形钢腹板部分斜拉桥健康监测位点和预警阈值研究

Monitoring Sites and Early Warning Thresholds in Health Monitoring System of Long-span Partially Cable-stayed Bridge with Corrugated Steel Web

以朝阳沟特大桥为研究对象,采用Midas/Civil、ANSYS有限元分析软件对大跨径波形钢腹板部分斜拉桥健康监测系统需要设置的监测位点和预警阈值进行了研究.结合朝阳沟特大桥的实际情况,经过对全桥力学特性、影响线和最不利位置荷载的有限元模拟分析,确定了该桥健康监测系统需设置的监测位点,提出了用于计算结构响应监测预警阈值的计算公式,该公式可将外部环境荷载的影响考虑进去,因此通过该公式计算得出的结构响应监测预警阈值能较为准确地反映该桥的结构受力安全.本研究可为同类桥梁的健康监测提供参考.

Taking Chaoyanggou Bridge as the research object,Midas/Civil and ANSYS finite element analysis software are used to study the monitoring sites and early warning thresholds that need to be set in the health monitoring system of long-span partially cable-stayed bridge with corrugated steel web.Combined with the actual situation of Chaoyanggou Reservoir Bridge,the mechanical property,the influence line and the most unfavorable position load of the whole bridge are analyzed by finite element simulation method,and the monitoring sites to be set in the bridge health monitoring system are determined.A calculation formula is proposed for calculating the early warning threshold of structural response monitoring.The formula can taken the influence of external environmental load into account.Therefore,the early warning threshold of structural response monitoring calculated by the formula can accurately reflect the structural stress safety.This study can provide a reference for health monitoring of similar bridges.