水闸闸墩钢筋插入底板深度的研究

Study on inserting depth of reinforcing steel in gate pier

水工混凝土结构设计规范中要求闸墩钢筋插入底板的深度应在底板拉应力区且应力值小于0.7ft的基础上加上锚固长度。但是,对于底板或坝体的应力分布,采用一般的材料力学法往往是难以求得的,所以插入深度一直存在一定的经验性。通过建立水闸整体模型,对闸墩和底板的应力分布进行计算,以W illam-Warnke五参数模型为混凝土破坏准则判据,求出钢筋插入的最小深度,结果可以为闸墩设计中钢筋插入深度提供合理的参考依据。

It is requested in the design specifications of hydraulic concrete structures that the depth of steel bar inserting into the bottom of pier should be within the range of tensile stress zone with the stress less than 0.7ft and with adding the anchorage length.However,it is difficult to obtain the stress distribution of bottom plate or dam body by material mechanics method.Therefore,the inserting depth is always empirical.Through the establishment of comprehensive gate model,the stress distribution of bottom and pier is analyzed,and then taking Willam-Warnke 5-parameter model as concrete failure criterion,the minimum inserting depth of steel bar is calculated.The results can provide a reasonable basis for the steel inserting depth in gate pier design.