高强钢筋混凝土桥墩抗震性能试验研究及有限元分析

发布时间：2018-06-04 18:35

本文选题：高强钢筋 + 低周往复荷载　；参考：《河北工业大学》2015年硕士论文

【摘要】：在现代化公路和铁路建设中,桥梁不再是一个独立的单元,而是整个工程中至关重要的一部分。近年来我国一些省市地震频发,而地震作为一种不可预见的自然灾害,对于工程建设的破坏尤其严重。桥梁在地震中抗震性能的好坏,决定整个道路工程是否能够正常使用,而桥梁的抗震性能很大程度上取决于桥墩的抗震性能。为减轻地震损伤和提高桥梁损伤以后的恢复能力,在桥墩中配置高强钢筋,利用高强钢筋弹性模量与普通钢筋相近而强度高的材料特性来改善桥墩在强震作用下损伤以后的变形性能,达到提高桥墩抗震性能的效果。本试验共设计4个矩形截面的钢筋混凝土桥墩试件,通过试件在水平荷载作用下的低周往复试验,比较不同钢筋强度、箍筋间距和轴压比对桥墩试件的破坏特征、承载能力、位移、滞回特性、骨架曲线、刚度退化和耗能能力等抗震性能指标的影响。研究表明:钢筋强度、轴压比和箍筋间距对配有HRB500高强钢筋混凝土桥墩的抗震性能影响效果显著。增大钢筋强度、减小轴压比和减小箍筋间距均能够提高高强钢筋混凝土桥墩试件滞回性能,减缓试件的刚度退化。增大钢筋强度与增大轴压比可以增强桥墩试件的极限承载力。为了更加全面的分析试验,利用ANSYS有限元分析软件对配有HRB500高强钢筋的混凝土桥墩试件进行非线性分析,通过对有限元模型计算结果的分析,有限元模拟结果与试验结果吻合较好,对试验结果进行较好的验证,并对试验中未能研究的方向进行补充预测,模拟结果表明:HRB500钢筋按等强度代换原则代替HRB335钢筋,试件的承载力基本保持不变,但滞回特性会有所下降;增大轴压比可以提高试件的承载力但会降低滞回性能。
[Abstract]:In modern highway and railway construction, bridge is no longer an independent unit, but an essential part of the whole project. In recent years, earthquake occurred frequently in some provinces and cities in China. As an unpredictable natural disaster, earthquake damage to engineering construction is especially serious. The seismic performance of the bridge in the earthquake will determine whether the whole road project can be used normally, and the seismic performance of the bridge largely depends on the seismic performance of the pier. In order to reduce the earthquake damage and improve the recovery ability of the bridge after the damage, the high strength steel bar is arranged in the pier. The elastic modulus of high strength steel bar is similar to that of ordinary steel bar and high strength material property is used to improve the deformation performance of pier after damage under strong earthquake and to improve the seismic performance of bridge pier. A total of 4 RC pier specimens with rectangular section were designed in this experiment. The failure characteristics and bearing capacity of different reinforcement strength, stirrups spacing and axial compression ratio were compared by low-cycle reciprocating test under horizontal load. Effects of displacement, hysteretic properties, skeleton curves, stiffness degradation and energy dissipation capacity on seismic performance. The results show that the strength of steel bar, axial compression ratio and stirrups spacing have significant effects on seismic performance of high strength reinforced concrete pier with HRB500. Increasing the strength of steel bar, decreasing the axial compression ratio and decreasing the space between stirrups can improve the hysteretic behavior of the specimens of high strength reinforced concrete pier and slow down the stiffness degradation of the specimens. The ultimate bearing capacity of the pier specimen can be enhanced by increasing the strength of steel bar and increasing the axial compression ratio. In order to analyze the test more comprehensively, the nonlinear analysis of concrete pier specimen with HRB500 high strength steel bar was carried out by using ANSYS finite element analysis software, and the result of finite element model calculation was analyzed. The finite element simulation results are in good agreement with the test results, and the experimental results are well verified, and the directions which have not been studied in the test are predicted. The simulation results show that the HRB335 steel bar is replaced by the equal strength replacement principle for the 1: HRB500 steel bar. The load-carrying capacity of the specimens remains unchanged, but the hysteretic properties decrease, and the axial compression ratio increases the bearing capacity of the specimens but decreases the hysteretic properties.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U443.22;U446.1

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