小湾拱坝横缝配筋的非线性地震反应分析

Analysis on the non-linear earthquake response of transverse joint reinforcement of Xiaowan Arch Dam

小湾拱坝是待建的世界上最高的拱坝 ,由于强震作用下横缝张开对止水和坝体安全不利 ,是否采取横缝配筋的抗震加固措施是设计者迫切需要从理论上解决的问题。为此 ,首次将考虑横缝配筋的拱坝非线性分析模型应用于小湾拱坝横缝配筋的地震反应分析 ,计算结果表明 ,横向配筋可以显著控制拱坝横缝张开度、加强拱坝整体性并一定程度减缓由于横缝张开导致的梁向应力恶化的程度 ,但为防止梁向开裂 。

The Xiaowan Arch Dam is the highest proposal arch dam in the world. The opening of transverse joint because of strong earthquake action is unfavorable to the safety of sealing and dam body. Whether the transverse joint reinforcement is adopted or not is an urgent subject to be solved in theory for the designer. For this reason, the non linear analysis model of dam with transverse joint reinforcement is applied to the analysis of earthquake response of the Xiaowan Arch dam with transverse joint reinforcement. The calculation results showed the transverse joint reinforcement can obviously control the opening of the transverse joints of arch dam, increase the integrity of arch dam and reduce the worsening of beam stresses caused by the opening of transverse joint to a certain degree. It is necessary to arrange proper vertical steel bars in order to avoid the cracks along beam direction.