| PC连续刚构桥梁底合理曲线线形研究 |
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| 引用本文： | 龙佩恒,刘靖,张文学.PC连续刚构桥梁底合理曲线线形研究[J].石家庄铁道学院学报,2011(2):28-32. |
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| 作者姓名： | 龙佩恒 刘靖 张文学 |
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| 作者单位： | [1]北京建筑工程学院土木与交通工程学院,北京100044 [2]保阜高速公路筹建处,河北保定071000 [3]北京工业大学土木学院,北京100022 |
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| 基金项目： | 河北省交通厅科技项目（080909901）;北京市教委面上项目（02090509103） |
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| 摘 要： | 针对PC连续刚构桥梁底长束的张拉导致合龙段箱梁底板和腹板开裂问题，以黑崖沟2号桥为背景工程，探讨了采用不同次数梁底曲线对箱梁局部应力状态的影响。在此基础上，揭示了箱梁易于开裂的危险部位，分析了导致开裂的主要原因，提出PC连续刚构桥梁底曲线次数不低于1．6次的建议。同时，结合实际工程，通过对三种防裂设计方案的理论研究与实桥测试结果的比对发现，采用跨中设置实体隔板的设计方案，可有效地解决合龙段箱梁底板下缘和腹板内侧的开裂问题。
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| 关 键 词： | PC连续刚构桥 底板曲线次数 底板与腹板开裂 防裂设计 实桥测试 |
Research on Reasonable Curve Shape of Girder Bottom of PC Continuous Rigid Frame Bridges |
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| Long Peiheng,Liu Jing,Zhang Wenxue.Research on Reasonable Curve Shape of Girder Bottom of PC Continuous Rigid Frame Bridges[J].Journal of Shijiazhuang Railway Institute,2011(2):28-32. |
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| Authors: | Long Peiheng Liu Jing Zhang Wenxue |
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| Institution: | 1. School of Civil and Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China ;2. Baofu Highway Preparation, Baoding 071000, China; 3. School of Civil Engineering, Beijing University of Technology, Beijing 100022, China) |
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| Abstract: | When tensioning the bottom prestressing tendons of PC continuous rigid frame to cause the bottom and web of closure segment to crack. Taking Heiyagou 2 Bridge project background, the influence of box girder local stress caused by different power of beam bottom in this paper beam bottom . By analyzing the likely crack parts and revealing the reasons, it is suggested bridge, it is likely as the engineering curves are studied that the power of curve of PC continuous rigid frame bridge should not be less than 1.6. Comparison between the re- suhs from theoretical analysis and from actual test on the bridge shows that solid diaphragm design can effectively solve the cracking problem at bottom slab and webs inside edges. |
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| Keywords: | PC continuous rigid frame bridge the power of bottom curve cracks in the bottom and web anti-crack design actual bridge test |
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