抗震钢筋对高拱坝抗震性能的影响

依据小湾拱坝伸缩横缝间布设抗震钢筋方案、特点和要求,围绕抗震钢筋对大坝抗震的影响展开研究,内容包括抗震钢筋种类的选择、温度影响、配筋方式、部位、数量的布设、方案的效果检验及其优化、以及布设预应力钢束的效果等,并提出了这些抗震措施对坝体横缝张开度的影响。研究结果认为在提供上、下游面各布设6层含钒抗震钢筋能有效减小地震时上游横缝的张开度,采用穿越横缝的抗震钢筋是有效的抗震措施。

Effect of aseismic reinforcement on earthquake resistance of high arch dam

According to the structure requirement and designed reinforcerment arrangement scheme of Xiaowan Arch Dam,the effect of aseismic reinforcement on earthquake resistance of the dam is studied.The main topics such as the selection of the variety of reinforcement,influence of temperature variation,effect of reinforcement locations,quantity and the way of steel bar arrangement are considered.It is found that the scheme in which two rows of steel bar are placed on the upstream and downstream suface of the dam can effectively minimize the openings of the transverse expansion joints during earthquake.Furthermore,the reinforcement bar passing through the transverse expansion joint is effective for enhancing the aseismic resistance of the dam.