钢筋混凝土连续梁高温下的抗剪性能

Shear Behavior of Reinforced Concrete Continuous Beams under High Temperature

通过非线性有限元分析软件,对6根不同保护层厚度的钢筋混凝土连续梁不同受火工况的抗剪性能进行了数值分析,得到连续梁沿截面温度时程变化及耐火极限。分析了保护层厚度对钢筋混凝土连续梁耐火极限的影响。结果表明:相同工况下,提高连续梁保护层厚度,能有效提高连续梁整体刚度,减小火灾过程中箍筋温度上升速率,显著提升钢筋混凝土连续梁耐火极限。

Through the nonlinear finite element analysis software,the shear behavior of six reinforced concrete continuous beams with different protective layer thicknesses under different fire conditions was numerically analyzed,and the time-history changes of temperature and fire resistance of the beams along the section were obtained.The influence of the thickness of the protective layer on the fire resistance of the reinforced concrete continuous beam was analyzed.The results show that under the same working conditions,the increase of the thickness of the beam protection layer can effectively improve the stiffness of the continuous beam,reduce the temperature rise rate of the stirrup during the fire process,and significantly improve the fire resistance of the reinforced concrete continuous beam.