配筋和预应力下拱坝动力特性的模型试验研究  

Model Tests for Dynamic Behaviors of Arch Dams with Different Reinforcement and Prestressing Forces

作　　者：盛志刚 卢玉林 吴鹏 SHENG Zhigang;LU Yulin;WU Peng(College of Civil Engineering,Institute of Disaster Prevention,Sanhe 065201,China)

机构地区：[1]防灾科技学院土木工程学院,河北三河065201

出　　处：《防灾科技学院学报》2023年第2期72-79,共8页Journal of Institute of Disaster Prevention

基　　金：中国地震局教师科研基金(20110104)。

摘　　要：通过坝体横缝配筋和施加拱向预应力的拱坝模型振动台试验,研究了不同配筋率和预应力的变化对拱坝动力特性的影响。通过振动台输入的几组典型动荷载(白噪声和谐波荷载等),来观测模型拱坝的动力反应,并进行相应的有限元分析。结果表明:在配置横缝钢筋之后,拱坝的动力性能出现明显的改变,固有频率得到明显提高;施加预应力之后,坝体的固有频率也得到一定的改变,而动载下的缝开度则明显减小。相比较而言,预应力增加对减小横缝的开度反应更为有效,而配筋的增加则对改善拱坝的整体性作用更加有效。Using a shaking table test of an arch dam model with contraction joint reinforcement and prestressing forces,we studied the influence of different reinforcement rates and prestress on the dynamic behaviors of the arch dam.The dynamic response of the arch dam model is observed through several sets of typical dynamic loads(white noise and harmonic loadings,et al.)input from the shaking table,and the corresponding finite element analysis is carried out.As the results show,after the contraction joint reinforcement,the dynamic performance of the arch dam changes significantly,and the natural frequency of it is notably improved.After the prestressing force is applied,the natural frequency of the dam body is also changed to a certain extent,while the joint opening under dynamic load is significantly reduced.In comparison,the increase of prestressing force is more effective to reduce the opening of contraction joints,while the increase of reinforcement is more effective to improve the integrity of arch dams.

关 键 词：拱坝 模型试验 振动台 横缝配筋 预应力 

分 类 号：TV642.46[水利工程—水利水电工程]