基于心形线特性的锚固洞体型优化研究
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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.
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.
引文
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[2]孙翔,尹延飞,庞文占,等.湍河渡槽槽身预应力施工技术应用及效果评价[J].水资源与水工程学报,2015,26(4):153-158.
[3]温中华,闫飞,解伟.蒲石河水库预应力闸墩模型受力状态研究[J].长江科学院院报,2009,26(8):73-75.
[4]胡清义.预应力闸墩优化设计研究[D].南京:河海大学,2005.
[5]郝晓飞,李守义,李萌,等.锚索预应力衰减与失效对结构的稳定影响分析[J].水资源与水工程学报,2016,27(6):169-173.
[6]徐远杰,唐碧华.三板溪大吨位预应力中墩三维有限元分析[J].武汉大学学报(工学版),2004,37(4):1-6.
[7]宋兴君,李守义,叶林.预应力闸墩锚固形式研究[J].水力发电学报,2006,25(5):92-96.
[8]马吉明,逢阿强,佟志强.闸墩预应力锚索新形式的探索[J].水力发电学报,2004,23(3):79-83.
[9]李守义,郭晓晶,董华峰,等.预应力锚固闸墩有限元分析研究[J].水资源与水工程学报,2007,18(6):35-38.
[10]胥润生.安康水电站表孔预应力闸墩优化设计[J].重庆交通大学学报(自然科学版),2000,19(3):106-108.
[11]杨胜,李守义,赵丽娟,等.高拱坝深孔预应力闸墩锚固形式研究[J].水资源与水工程学报,2007,18(6):79-83.
[12]李振龙,李守义,范瑞朋.里底水电站溢洪道竖井式预应力闸墩应力及应变分析[J].水资源与水工程学报,2009,20(5):140-143.
[13]周伟,杨胜,成磊,等.胶结式内锚固预应力闸墩的非线性接触分析[J].四川水力发电,2012,31(S1):125-127.
[14]赵海峰.心形线双曲拱坝体型建模与有限元分析[D].重庆:重庆交通大学,2014.