论文部分内容阅读
以高速铁路中采用的圆端形空心桥墩为原型,设计了10根大比例模型。考虑恒定轴向力的作用,进行低周反复荷载试验,得到不同桥墩模型的破坏特性、滞回曲线,依此分析各参数下桥墩的延性及耗能性能,并利用两种典型的抗剪公式对模型的抗剪承载力进行评估。试验结果表明,该类桥墩均为弯曲型破坏,墩底普遍有弯剪斜裂缝。滞回曲线捏缩效应明显并且骨架曲线从开裂到屈服上升缓慢。随着轴压比的提高,模型的弯曲强度有所增大,延性下降。由于模型的体积配箍率均较低,其对延性的影响不明显。纵筋率对滞回曲线形状影响较大,增加纵筋率耗能能力随之增大。
In the high-speed railway used in the round-shaped hollow pier as a prototype, designed a large proportion of 10 models. Considering the effect of constant axial force, low-cycle repeated load tests were carried out to obtain the failure characteristics and hysteresis curves of different bridge pier models. Based on the analysis of the ductility and energy dissipation performance of the pier under various parameters, two typical shear formulas The shear capacity of the model was evaluated. The test results show that all of these piers are bent type, and the pier bottom is generally inclined and sheared. Hysteresis curve pinch-shrinkage effect is obvious and the skeleton curve from cracking to yield rise slowly. With the increase of axial compression ratio, the flexural strength of the model increases and ductility decreases. Due to the lower volumetric rate of the model, the influence on the ductility is not obvious. The longitudinal reinforcement rate has a great influence on the shape of the hysteresis curve, which increases the energy dissipation capacity of the longitudinal reinforcement.