装配式混凝土梁受火后抗弯承载力可靠度

Reliability of bending capacity of precast concrete beam after fire

为了研究装配式混凝土梁受火后抗弯承载力可靠度变化的一般规律,提出基于当量正态法的可靠度分析方法。考虑荷载效应比、受火时间等因素的影响,应用有限元分析软件ABAQUS对ISO 834标准升温曲线下装配式混凝土梁温度场分布情况进行数值模拟,应用MATLAB进行可靠度数值分析。计算结果表明,随着荷载效应比的增加,装配式混凝土梁的抗弯承载力可靠度降低,受火后其抗弯承载力可靠度随着时间的增加明显降低。分析结果可为装配式混凝土梁受火后力学性能分析提供参考。

In order to study the regularity of bending capacity reli ability of fire-damaged precast concrete beam, the rettability anal- ysis method based on equivalent normalize method was proposed.The load effect ratio and heating time were considered, lhe models of precast concrete beam with IS（） 834 time-temperature curve were established by software ABAQUS, tile reliabilifies were cal culated by MATLAB. The results showed that with the load effecl ratio increases, the reliability of bending capacity of precast con crete beam deelines, the tell_ability of bending capacity of fire _dam aged precast concrete beam declines sharply with the inerease of heating time. The results provided references to the mechanical performance analysis of precast concrete beam subiccled lo fire.