高拱坝抗震钢筋配置方案研究

采用显式有限元结合人工透射边界的地震波动模拟方法和动接触力模型，进行了一高拱坝多种布设抗震钢筋方案的分析比较，基本方案为在坝体上部106m高的范围内布设6层拱向钢筋，每层上下游面各放置96根φ32的含钒抗震钢筋HRB400，对坝体上下游均布设钢筋、仅坝体上游布置钢筋、坝体上游距坝面4m位置布筋，以及坝体上游距坝面4m位置配置数量减半的抗震钢筋的4种方案均与不配筋计算方案的结果进行了比较，以抗震钢筋的主要功能即限制坝体横缝在地震中的张开度为主要考察依据，在满足张开度限制条件下，又考虑施工方便和经济性要求，推荐了在坝体上游距坝面4m位置配置数量减半的抗震钢筋是较为经济、合理的高拱坝抗震钢筋配置方案。

Study on the Seismic Reinforcement Layout Scheme of High Arch Dam

This paper uses the wave simulation method in which the explicit finite element is combined with artificial transmitting boundary and the dynamic contact force model to proceed the compare and analysis of several seismic reinforcement layout scheme for an arch dam. The basic scheme is to place six layers of arch reinforced steel bar in the range of 106 meters to the dam crest,to place 96 earthquake-resistance steel bars named HRB400 in the upstream face and the downstream face every layer. The other schemes include: only place the steel bar in the upstream face, place the steel bars 4 meters away from the upstream face and only use half of the amount of steel bars. According to the requirement of a seismic opening degree of the joints and the economic feasibility and the construction convenience, it suggested that the scheme of placing half of the amount of steel bars 4 meters away from the upstream face is an economical and practical layout scheme for the seismic reinforcement.