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将化爆荷载等切线简化为突加三角形动载,运用动力有限元程序计算三种典型跨长钢筋混凝土适筋梁在二次动载冲击下的破坏形态和动力响应,重点分析对比前后两次荷载作用下梁构件跨中正截面钢筋和混凝土应力应变的变化特征。结果表明,梁在二次突加动载作用下的破坏包含整体弯曲破坏和局部剪切破坏,钢筋和混凝土的二次残余应变增大幅度远高于残余应力的提高。构件越长,挠度峰值相对越大,但对钢筋和混凝土应力峰值影响不大。通过等效一次动载与二次动载的响应,给出了三种典型跨长钢筋混凝土梁二次动载的设计提高系数供设计参考。
The tangent of the detonation load is simplified as sudden triangular dynamic load, the dynamic finite element program is used to calculate the failure morphology and dynamic response of the three kinds of typical span-length reinforced concrete beam with dynamic loading under secondary dynamic loading. Characteristics of Stress and Strain of Reinforced Concrete and Concrete Across Neutral Cross Section under Beam Load. The results show that the failure of beam under the second sudden dynamic loading includes the total bending failure and local shear failure. The increase of secondary residual strain of reinforced concrete and concrete is much higher than the residual stress. The longer the component, the larger the peak deflection, but it has little effect on the peak stress of steel bar and concrete. Through the equivalent first-time dynamic response and the second-order dynamic response, the design improvement coefficient of the three kinds of typical long-span RC beams with secondary dynamic load is given for design reference.