| 体外预应力节段预制试验梁力学性能数值分析 |
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| 引用本文： | 姜海波,陈黎,危春根,龚景森. 体外预应力节段预制试验梁力学性能数值分析[J]. 工业建筑, 2012, 0(Z1): 101-105,110 |
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| 作者姓名： | 姜海波 陈黎 危春根 龚景森 |
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| 作者单位： | 广东工业大学土木与交通工程学院;广东省路桥建设发展有限公司 |
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| 基金项目： | 广州市公路局科技项目(穗公研2008-3);广州科技计划项目(2008J1-C201);广东省交通运输厅科技项目(2010-02-16);广东省公路管理局科技项目(粤公研2010-9) |
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| 摘 要： | 提出一种有限元模型,用于体外预应力节段预制试验梁力学性能数值分析。该有限元模型用ANSYS通用分析软件中的SOLID65单元建立试验梁的3D实体模型,以接触单元模拟节段之间的干接缝,用节点耦合法实现体外预应力束与混凝土梁之间的连接。考虑混凝土材料非线性和几何非线性,通过数值模拟分析揭示试验梁的结构行为、混凝土接缝处的应力变化规律和裂缝张开情况。该有限元模型研究了预应力配束形式、体外预应力二次效应和转向处滑移对试验梁弯曲力学性能的影响。数值分析揭示了在荷载300kN以前,节段接缝处于受压状态;在300kN以后,裂缝张开是影响试验梁力学性能的主要因素。研究结果可用于预制节段桥梁的设计。
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| 关 键 词： | 体外预应力 节段预制 数值模拟 干接缝 有限元 |
NUMERICAL ANALYSIS OF MECHANICAL PROPERTIES OF PRECAST SEGMENTAL CONCRETE TEST BEAM WITH EXTERNAL TENDONS |
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| Jiang Haibo,Chen Li,Wei Chungen,Gong Jingsen. NUMERICAL ANALYSIS OF MECHANICAL PROPERTIES OF PRECAST SEGMENTAL CONCRETE TEST BEAM WITH EXTERNAL TENDONS[J]. Industrial Construction, 2012, 0(Z1): 101-105,110 |
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| Authors: | Jiang Haibo Chen Li Wei Chungen Gong Jingsen |
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| Affiliation: | 1(1.Faculty of Civil and Transportation Engineering,Guangdong University of Technology, Guangzhou 510006,China;2.Highway and Bridge Construction Development Limited Company in Guangdong Province,Guangzhou 510635,China) |
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| Abstract: | A finite element model is proposed for numerical analysis of mechanical properties of precast segmental concrete test beam with external tendons.The 3D finite element model of test beam is established by SOLID65 element in ANSYS software,while the dry joint between segments is simulated by contact element,and the attachment between concrete beam and external prestressed tendons is achieved by node coupling method.Numerical simulation analysis reveals structural behavior,stress variations and crack opening cases of joints of the test beam by considering the concrete material and geometric nonlinearity.Influencing factors of the bending mechanical properties of the test beam are researched with different tendon types,secondary effect of external tendons and external tendon slip at deviation.Results of the numerical analysis reveal that the segmental joints are in the compressive state below the 300 kN.Crack opening is the key factor of the mechanical properties of the test beam above the 300 kN.The results can be used for structural design of precast segmental bridge. |
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| Keywords: | external prestressed precast segments numerical simulation dry joint finite element |
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