大跨曲线斜拉桥Π形主梁分析方法研究

发布时间：2019-02-26 17:14

【摘要】：为获得适用于大跨曲线混凝土斜拉桥Π形主梁受力分析的实用方法,以刚果共和国布拉柴维尔滨河大道桥为研究对象,综合考虑施工过程中新梁段的浇筑、预应力筋张拉、混凝土收缩徐变等影响,分别采用梁-板混合有限元法及杆系有限元法建立空间有限元模型,对斜拉索索力、支座反力、主梁内力进行计算对比。结果表明:曲线斜拉桥主梁"弯扭耦合"效应明显,由此导致的边墩支座脱空问题应引起重视;梁-板混合有限元方法能够反映实际工程的主要力学行为和特点,特别适合空间复杂受力的Π形截面曲线梁的受力分析。最后通过缩尺模型试验,验证了该方法用于实际桥梁受力分析的可行性。研究结果可为大跨Π形主梁曲线斜拉桥的设计及施工提供参考。
[Abstract]:In ord to obtain a practical method suitable for that stress analysis of the main beam of a large-span curve concrete cable-stayed bridge, taking the bridge of the Brazzaville Riverside of the republic of the Congo as the research object, the influence of the pouring of the new beam section, the tension of the prestressed reinforcement, the shrinkage of the concrete and the like in the construction process are comprehensively considered, The space finite element model is established by using the beam-plate hybrid finite element method and the rod-based finite element method, and the force of the cable-stayed cable, the reaction force of the support and the internal force of the main beam are compared. The results show that the "bending and torsion coupling" effect of the main beam of the curved cable-stayed bridge is obvious, and the problem that the side pier support is not empty should be paid attention to; the beam-plate hybrid finite element method can reflect the main mechanical behavior and characteristics of the actual project, and is particularly suitable for the stress analysis of the curved-section curved beam with the complex stress of the space. Finally, by means of the scale model test, the feasibility of the method for the force analysis of the actual bridge is proved. The results of the study can provide a reference for the design and construction of the large-span beam-stayed bridge.
【作者单位】：西南交通大学土木工程学院;中交路桥技术有限公司;
【基金】：国家重点研发计划(2016YFC0802202) 中国路桥集团重大科技项目(2014C008)
【分类号】：U448.27

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