| 施工阶段大跨径预应力混凝土刚构桥腹板开裂机理 |
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| 引用本文： | 陈齐风,郝天之,张磊,邱波,徐赵东.施工阶段大跨径预应力混凝土刚构桥腹板开裂机理[J].保鲜与加工,2016(5):66-73. |
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| 作者姓名： | 陈齐风 郝天之 张磊 邱波 徐赵东 |
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| 作者单位： | 东南大学 土木工程学院, 南京 210096;广西交通科学研究院, 南宁 530007,广西交通科学研究院, 南宁 530007;柳州欧维姆机械股份有限公司, 广西柳州, 545005,广西交通科学研究院, 南宁 530007,广西交通科学研究院, 南宁 530007,东南大学 土木工程学院, 南京 210096 |
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| 基金项目： | 中国博士后基金特别资助（2016T90410）；中国博士后科学基金面上项目（2015M581704）；广西自然科学基金（2015GXNSFBA139227、2014GXNSFBA118258），南宁市科学研究与技术开发计划（20163139），广西科技攻关项目（桂科攻1598009-1）；广西北部湾经济区科技园区创新创业人才培育项目（桂科计字[2015]245号-2） |
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| 摘 要： | 进行了大跨径预应力混凝土刚构桥腹板开裂机理研究，基于弹性力学平面问题分析方法，推导了集中荷载作用下的板件应力函数表达式，绘制了不同受压边长与集中荷载长度比（d/a）下的横向应力曲线，拟合了集中荷载作用下构件的横向应力求解函数，构造了混凝土刚构桥腹板在预应力集中荷载作用下等效压力矩形的选取方法，并基于平面应力的表达式提出了在三维情况下沿预应力轴线的横向应力计算方法。通过建立某预应力混凝土刚构桥0~3#段实体有限元模型，分析施工过程中刚构桥混凝土腹板在不同等级预应力作用下的开裂情况。结果显示：有限元裂缝模拟与实桥腹板开裂范围一致，有限元应力分析结果下限值与推导的横向应力求解函数计算结果接近，变化趋势一致，印证了横向应力函数求解方法的正确性。
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| 关 键 词： | 刚构桥 横向应力 腹板开裂 腹板预应力束 钢筋 |
| 收稿时间： | 2016/3/22 0:00:00 |
Web cracking mechanism of long span rigid-frame prestressed concrete bridge in construction stage |
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| Chen Qifeng,Hao Tianzhi,Zhang Lei,Qiu Bo and Xu Zhaodong.Web cracking mechanism of long span rigid-frame prestressed concrete bridge in construction stage[J].Storage & Process,2016(5):66-73. |
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| Authors: | Chen Qifeng Hao Tianzhi Zhang Lei Qiu Bo and Xu Zhaodong |
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| Institution: | School of Civil Engineering, Southeast University, Nanjing 210096, P. R. China;Guangxi Transportation Research Institute, Nanning 530007, P. R. China,Guangxi Transportation Research Institute, Nanning 530007, P. R. China;Liuzhou OVM Machinery Co. Ltd., Liuzhou 545005, Guangxi P. R. China,Guangxi Transportation Research Institute, Nanning 530007, P. R. China,Guangxi Transportation Research Institute, Nanning 530007, P. R. China and School of Civil Engineering, Southeast University, Nanjing 210096, P. R. China |
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| Abstract: | Web cracking mechanism of long span rigid-frame prestressed concrete bridge construction stage was presented. Based on the elasticity theory, the 2-D stress function of web under patching load was deduced, the function curve of the horizon stress of different coefficient (d/a) was drawn, then a horizon stress function was fitted, and the method of equivalent pressure prism selection method was put forward. Later the 3-D situation horizon stress along the tendon line was considered based on 2-D horizon stress function. To verify the theory function, 0~3# rigid frame bridge segment finite element model was established, the concrete web cracking analysis was carried out in different prestressed level. The results showed that the crackling area of the web in the bridge was coincided with the finite element analyze, the lower limit stress of the finite analysis was also coincided to the theory calculated of transverse stress function put forward by this paper. |
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| Keywords: | concrete bridge transverse stress web cracking web tendons reinforcement |
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