卡扣式机械连接预应力实心方桩承台节点力学性能有限元分析

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英文篇名：Finite Element Analysis of Mechanical Properties of Pile-cap Connections for Prestressed Concrete Solid Pile Using Snap-in Mechanical Connection 作者：孙传智 ; 缪长青 ; 李爱群 ; 乔燕 英文作者：SUN Chuanzhi;MIAO Changqing;LI Aiqun;QIAO Yan;Department of Architecture Engineering,Suqian College;School of Civil Engineering,Southeast University;Beijing University of Civil Engineering and Architecture; 关键词：卡扣式机械连接 ; 预应力实心方桩 ; 低周反复试验 ; 数值模拟 ; 参数分析 英文关键词：snap-in mechanical connection;;prestressed concrete solid pile;;cyclic loading test;;numerical simulation;;parameter analysis 中文刊名：DZXK 英文刊名：Journal of Disaster Prevention and Mitigation Engineering 机构：宿迁学院建筑工程系;东南大学土木工程学院;北京建筑大学土木与交通工程学院; 出版日期：2019-02-15 出版单位：防灾减灾工程学报 年：2019 期：v.39 基金：国家自然科学基金项目(51778135);; 江苏省第十二批六大人才高峰项目(2015-JZ-019);; 宿迁市“千名拔尖人才培养工程”项目(2017)资助 语种：中文; 页：DZXK201901006 页数：8 CN：01 ISSN：32-1695/P 分类号：41-48

摘要

介绍了一种新桩型-卡扣式机械连接预应力混凝土实心方桩,然后针对卡扣式机械连接预应力混凝土实心方桩和承台处节点试验中没有考虑的因素进行了数值模拟分析,包括预应力方桩配箍率、增加的普通钢筋配筋率以及不同有效预应力等因素,以探究这些因素对预应力方桩承台节点力学性能的影响。研究结果表明:不同箍筋间距对节点的水平最大承载能力影响较小;箍筋间距越小,对混凝土的约束能力就越大,节点水平承载力的下降段越平缓;箍筋间距越大,水平承载力的下降段越陡峭,刚度退化越快。提高有效预压应力可以提高节点处的水平承载能力;有效预应力越大,桩身会发生更大的损伤,有效预应力越小,承台会发生更大的损伤;增加普通钢筋,能有效改善预应力方桩的延性和水平承载能力;使用大直径钢筋能增加节点的锚固性能,桩身承受更多的损伤。数值模拟成果可为卡扣式机械连接混凝土实心方桩的后期改进和应用推广提供可靠的依据。
        First,a new pile type-prestressed concrete solid pile with snap-in mechanical connection was introduced in this paper.Then,numerical simulation was carried out to analyze some casual factors,unconsidered in previous experiments,on the mechanical behavior of cap-pile joints,including stirrup ratio,steel reinforcement ratio,and effective prestress.Results showed that stirrup spacing had limited influence on the horizontal maximum bearing capacity of nodes.However,a smaller stirrup spacing imposed a greater constraint on the concrete,and also resulted in a gentler decline curve of horizontal bearing capacity.For a larger stirrup spacing,the decline curve of horizontal bearing capacity would be steeper.The following results were also obtained:(1)increasing the effective prestress increased the horizontal bearing capacity of nodes;(2)a higher effective prestress corresponded to greater damage to the pile body,while a lower effective prestress to the pile caps;(3)the ductility and horizontal bearing capacity were improved by using steel reinforcements;and(4)the use of large-diameter steel bars improved the anchorage performance of nodes,causing more damage to the pile body.The simulation results should provide a reliable basis for improvement and application of this type of pile.

引文

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