加载方向对加翼桩极限横向承载力的影响
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摘要
为分析加载方向对加翼桩极限横向承载力的影响,采用ABAQUS有限元软件建立数值分析模型,定量分析软粘土地基中单桩和三种典型加载方向下加翼桩的受力变形特性和极限横向承载力。依据数值分析结果,采用数值逼近方法建立了加载方向影响系数k3的经验公式,以反映加翼桩极限横向承载力与加载方向的关系,对现有计算方法进行了补充,并对其适用性进行了分析。结果表明,加翼桩横向位移和内力的分布与单桩的规律相似,桩身和翼板连接处易出现应力集中现象,极限横向承载力较单桩的显著提高。加载方向对加翼桩极限横向承载力影响较大,当横向荷载与前翼板夹角增大,极限横向承载力显著降低。经验公式计算精度良好,可较好地反映加翼桩极限横向承载力与加载方向的关系,可为工程设计提供参考。
In order to analyze the impact of load direction on ultimate bearing lateral capacity of winged pile,numerical analysis model was established by ABAQUS finite element software.The force deformation characteristics and ultimate bearing lateral capacity of winged pile subjected to soft clay foundation with different direction were analyzed.And an empirical formula of load direction influencing factor k3 were proposed based on numerical approximation method.The result shows that load direction affects the distribution of soil stress on the pile.Stress of plates increases when the angle of plates and a load getting bigger and decreases along the width path.Plates beside pile improve the force and deformation of structure.Stress concentration appears at the connect part of pile and plates.When the angle of lateral load and front plate getting bigger,the lateral displacement increases,bearing lateral load reduces,the phenomenon of stress concentration relation reduces.Calculation precision of empirical formula is preferable,and it can provide reference for engineering design.
In order to analyze the impact of load direction on ultimate bearing lateral capacity of winged pile,numerical analysis model was established by ABAQUS finite element software.The force deformation characteristics and ultimate bearing lateral capacity of winged pile subjected to soft clay foundation with different direction were analyzed.And an empirical formula of load direction influencing factor k3 were proposed based on numerical approximation method.The result shows that load direction affects the distribution of soil stress on the pile.Stress of plates increases when the angle of plates and a load getting bigger and decreases along the width path.Plates beside pile improve the force and deformation of structure.Stress concentration appears at the connect part of pile and plates.When the angle of lateral load and front plate getting bigger,the lateral displacement increases,bearing lateral load reduces,the phenomenon of stress concentration relation reduces.Calculation precision of empirical formula is preferable,and it can provide reference for engineering design.
引文
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[2]文松霖.砂土中加翼桩的水平承载力试验研究[J].岩土工程学报,1990,12(4):61-67.
[3]李炜,郑永明,孙杏建,等.加装稳定翼的海上风电大直径单桩基础数值仿真[J].水利水运工程学报,2012(3):56-63.
[4]王曦鹏,陈灿明,苏晓栋,等.水平静荷载作用下翼板对基桩工作性状影响的有限元研究[J].水道港口,2016,37(6):609-614.
[5]于仁斌,范庆来,郑静,等.海上风机加翼桩水平受荷简化分析模型研究[J].地下空间与工程学报,2016(s1):113-119.
[6]王曦鹏.加翼桩水平承载力影响因素及计算方法研究[D].南京:河海大学,2017.
[7]王伟,杨敏.海上风电机组地基基础设计理论与工程应用[M].北京:中国建筑工业出版社,2014.
[8]JTJ255-2002,港口工程基桩静载荷试验规程[S].北京:人民交通出版社,2003.
[9]费康,张建伟.ABAQUS在岩土工程中的应用[M].北京:中国水利水电出版社,2010.
[10]曹金凤,石亦平.ABAQUS有限元分析常见问题解答[M].北京:机械工业出版社,2009.