摘要
针对预留锚固洞对拉锚索的锚固方式,传统梯形锚固洞周围拉应力过大的问题,以某工程预应力闸墩中墩为研究对象,建立三维有限元模型,根据心形曲线的几何特性,提出了心形锚固洞体型,在不同的荷载组合下,对梯形和心形锚固洞进行了对比分析,并对其设计参数做了深入研究。结果表明:心形锚固洞与传统梯形锚固洞相比,周围拉应力明显降低,受力情况更好;将心形锚固洞上游曲面改为铅直面,能有效控制锚固洞体积,且在满足施工情况下,可尽量靠近下游面中心;心形锚固洞顶面与下游面交线到顶层锚索中心距离取1. 5～2. 0m,底面与下游面交线到底层锚索中心距离取1. 2～1. 5m,较为合理。
Aiming at the anchoring method of the anchoring hole to the anchor cable and the excessive tensile stress around the traditional trapezoidal anchoring hole,the middle pier of a prestressed pier of a project was taken as the research object to establish a 3-dimensional finite element model.According to the geometric characteristics of the cardioid curve,the shape of the cardioid anchoring hole was proposed.The trapezoidal and cardioid anchoring holes were compared under different load combinations,and the design parameters were studied in depth.The results showed that the cardioid anchoring hole has lower tensile stress and better stress than the traditional trapezoidal anchoring hole.The upstream curved surface of the cardioid anchorage tunnel changed into a straight surface,which can effectively control the volume of the anchorage tunnel and can be as close as possible to the downstream surface center under the construction conditions.The distance between the top surface of cardioid anchoring hole and the downstream surface to the top anchor cable is 1.5~2.0 m,and the distance between the bottom surface and the downstream surface to the bottom anchor cable is 1.2~1.5 m,which is reasonable.
作者
夏可
李守义
张岳
何冠洁
郭金君
XIA Ke;LI Shouyi;ZHANG Yue;HE Guanjie;GUO Jinjun(Faculty of Water Resources and Hydro-Electric Engineering,Xi'an University of Technology,Xi'an 710048,China)
出处
《水资源与水工程学报》
CSCD
2019年第2期161-165,共5页
Journal of Water Resources and Water Engineering
基金
国家自然科学基金项目(51479168)
关键词
预应力闸墩
锚固洞体型
心形线
心形锚固洞
体型优化
pre-stressed pier
anchor hole type
cardioid
cardioid anchor hole
shape optimization
