公路钢筋砼梁桥目标可靠指标的初步分析

A PRELIMINARY ANALYSIS OF TARGET RELIABILITY INDEX FOR HIGHWAY CONCRETE BEAM BRIDGE

本文首先根据误差传递公式导出公路钢筋砼梁桥抗力统计参数K_R,V_R的计算公式。然后分析各有关统计参数的取值,计算K_R,V_R,并分析确定K_Q,V_Q,K_Q,V_Q。在此基础上,用可靠度理论中的验算点法(亦称JC法),校准计算公路钢筋砼梁桥的可靠指标β,得到在荷载(恒+汽)组合情况下的β平均值为3.55。最后,推荐出目标可靠指标[β]。

According to the theory of error transfer, a formula of statistical parameters, V_R and K_R, of resisting force in highway concrete beam bridge is derived in this paper. The parameters such as K_G, V_G, K_Q and V_Q were analyzed and determined by analyzing and calculating the values of K_R and V_R. From this, the reliability index, β, for highway concrete beam bride is corrected by the V_R method,and the average valud of β which is equal to 3.55 has been obtained under loading. In the end ,the target reliability index,[β] ,is recommended.