2类PBL推出试验破坏机理及承载力影响因素研究

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英文篇名：Study on the failure mechanism and bearing capacity influence factors of two kinds of push-out tests of PBL 作者：施洲 ; 秦搏聪 英文作者：SHI Zhou;QIN Bocong;School of Civil Engineering, Southwest Jiaotong University; 关键词：PBL剪力键 ; 推出试验 ; Abaqus ; 破坏机理 ; 参数分析 英文关键词：PBL shear connector;;push-out test;;Abaqus;;failure mechanism;;parameter analysis 中文刊名：CSTD 英文刊名：Journal of Railway Science and Engineering 机构：西南交通大学土木工程学院; 出版日期：2019-04-15 出版单位：铁道科学与工程学报 年：2019 期：v.16;No.109 基金：中国铁路总公司科技开发计划重大项目(2017G006-A) 语种：中文; 页：CSTD201904015 页数：10 CN：04 ISSN：43-1423/U 分类号：115-124

摘要

为探明2类PBL推出试验的破坏机理及极限承载力的主要影响因素,基于Abaqus平台运用非线性有限元方法建立2类PBL推出试验的精细有限元模型。计算结果表明:PBL在埋入式试验中的极限承载力与滑移性能均优于标准推出试验,非线性有限元计算结果与试验结果符合较好。2类推出试验的破坏机理及主要构件的破坏形态差异较大,标准推出试验中试件的破坏源于混凝土开裂,而埋入式试验则是由于贯通钢筋被剪断。参数分析表明:在标准推出试验中,PBL极限承载力主要与混凝土强度和开孔板孔径有关;在埋入式试验中,混凝土强度、开孔板孔径和贯通钢筋直径对PBL极限承载力均有较大影响。
        In order to explore the failure mechanism and the main influencing factors of the ultimate bearing capacity of the two types of push-out test of PBL, the fine finite element model of the two kinds of PBL push-out tests was established by using the nonlinear finite element method based on the Abaqus platform. The calculation results show that the ultimate bearing capacity and slip performance of PBL in the embedded push-out test is better than that of the standard push-out test, and the nonlinear finite element calculation results are in good agreement with the test results. In two types of push-out test of PBL, the failure mechanism and the failure form of the main components are different. The failure of the specimen in the standard push-out test is due to the cracking of the concrete, while that in the embedded test is due to the failure of the perforated rebar. The parameter analysis shows that the ultimate bearing capacity of PBL is mainly related to the strength of concrete and the aperture of perforated plate in the standard push-out test. In the embedded test, the strength of concrete,the aperture of the perforated plate and the diameter of the perforated rebar have great influence on the ultimate bearing capacity of the PBL.

引文

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