钢筋混凝土梁高温下的抗剪性能

Shear Behavior of Reinforced Concrete Beams at High Temperature

目前针对钢筋混凝土梁抗火性能的研究集中在火灾下梁的抗弯性能研究,而对钢筋混凝土梁火灾下的抗剪性能研究较少。通过建立钢筋混凝土梁的非线性有限元分析模型,对其高温下的抗剪性能进行模拟,分析了不同配箍率对钢筋混凝土梁抗剪性能的影响。结果表明:火灾下钢筋混凝土梁的挠度随配箍率的增加呈减小的趋势,增加箍筋直径和减小箍筋间距均可显著提高梁的抗剪性能。

At present,most of the studies about the fire behavior of RC beam have been focused on the flexural behavior of RC beam,and a limited number of studies on shear behavior of RC beams have been carried out.The nonlinear finite element model was developed,the shear behavior of RC beam in fire was simulated.The shear behavior of RC beams with various stirrup ratios in fire was analyzed.The results show that the deflection of reinforced concrete beam tends to decrease with the increase of the stirrup ratio.Increasing the diameter or decreasing the spacing of the stirrup can both significantly increase the shear strength of the beam.