钢筋混凝土连续梁火灾后抗剪性能有限元分析

Finite Element Analysis of Shear Behavior of Reinforced Concrete Continuous Beams after Fire

高温受火后钢筋混凝土构件截面剩余力学性能准确检验,是火灾以后对结构损伤评定与加固设计的基础。其中梁作为主要承重构件,有必要对其受火后性能变化进行研究。目前,国内外对钢筋混凝土梁高温后力学性能变化进行了一些分析研究,但是有关受火作用后连续梁抗剪性能方面的成果相对偏少。该项目通过ABAQUS计算总结两跨连续梁不同参数下的抗剪承载力与变化规律。研究结果表明,增加配箍率改善了两跨梁剩余抗剪性能,而受火时间越长,剪跨比越大均不利于双跨连续梁的火后抗剪性能。

The accurate test of the residual mechanical properties of RC members after fire is the foundation of the structural damage assessment and reinforcement design after fire.The beam is the chief load-carrying member,so it is necessary to study its performance change after fire.At present,domestic and foreign researchers have made some analysis and summary on the mechanical properties of reinforced concrete beams after high temperature,but there are relatively few achievements on the shear resistance capability of continuous beams after fire action.The shear capacity and variation of continuous beams under different parameters were calculated and analyzed by ABAQUS.The results show that the residual shear performance of the two-span beams is improved by increasing the hoop ratio.The longer the fire time and the larger shear span ratio are not conducive to the post-fire shear performance of double-span continuous beams.