基于监测数据的在役RC梁桥运营可靠度分析

Analysis on Operational Reliability of Existing RC Beam Bridge Based on the Monitoring Data

为研究基于监测数据的在役RC梁桥运营可靠度分析方法,对我国某高速公路某大桥进行长期的交通荷载监测,并对其中卡车荷载的部分参数进行简要分析。引入桥梁耦合振动分析系统取代传统影响线加载方法,获取在役RC桥梁的汽车荷载效应样本,并通过抗力、恒载效应、汽车荷载效应概率分布模型的建立,给出在役RC桥梁的运营可靠度分析方法,并通过对一座典型RC梁桥的运营可靠度分析,验证了该方法的适用性。结果发现:所建立的分析方法能够应用于在役RC梁桥的可靠度分析,通过对典型RC8m板桥的运营可靠度分析发现,当结构劣化所引起的抗力折减系数不低于0.80时,在当前荷载水平下,其运营可靠度均能达到延性破坏构件的目标可靠指标。

In order to study the operational reliability analysis method of existing RC beam bridge, a long - term traffic load monitoring is carried out for a bridge in a certain expressway in China, and some parameters of truckload are analyzed briefly. The vehicle load effect sample of RC bridge is obtained by using bridge coupling vibration analysis system instead of traditional influence line loading method. The probability distribution models of resistance, dead load effect and vehicle load factor effect are established. And the operational reliability analysis method of existing RC bridge is given. The results show that the established method can be used in the reliability analysis of existing bridge. According to the reliability analysis on the typical RC8m slab bridge, the reliability index of the 8m RC slab bridge can meet the qualification of current standard when the resistance reduction coefficient greater than or equal to 0.80.