独柱墩梁桥横向稳定计算理论与验证
发布时间：2018-07-17 03:06
【摘要】：针对独柱墩梁桥横向稳定存在的隐患问题,通过对多座独柱墩梁桥倒塌现场残骸的调查研究提出了倾覆过程中的5种可能破坏模式。基于典型破坏模式,提出以所有抗扭支座失效(脱空)作为判断倾覆的准则。采用有限度的抗扭支座模拟支座尺寸对抗倾覆的有利影响,将独柱墩梁桥倾覆过程等效为箱梁变形体转动及刚体转动的叠加,并考虑箱梁大转动导致桥墩反力重分布对于桥梁抗倾覆的影响。在不考虑、考虑支座尺寸(即支座点支撑或面支撑)2种模式下,通过能量法和变分原理建立空间力系平衡来判断箱梁是否倾覆;最后以上虞春晖桥、哈尔滨三环路鸿福路段上行匝道桥、粤赣高速匝道桥和津晋高速匝道桥为例,对提出理论进行了验证,并进一步进行了影响因素分析。研究结果表明:相比于规范计算方法将倾覆简单地看作刚体的转动,由于综合考虑了变形体转动、刚体转动及箱梁大转动对桥梁倾覆的影响,提出的计算方法所得4座桥的临界倾覆荷载与实测倾覆荷载接近,可偏安全的计算梁桥的抗倾覆承载力。
[Abstract]:In view of the hidden danger of lateral stability of single column pier girder bridge, five possible failure modes in the process of capsizing are put forward through investigation and research on the site wreckage of several single column pier girder bridges. Based on the typical failure mode, all anti-torsion bearing failure (void removal) is proposed as the criterion to judge overturn. A limited torsional bearing is used to simulate the beneficial effect of bearing size on overturning, and the overturning process of single column pier girder bridge is equivalent to the superposition of box girder deformation body rotation and rigid body rotation. The influence of the redistribution of the reaction force on the overturning of the bridge caused by the large rotation of the box girder is considered. Under two modes of bearing size (i.e. support at support point or surface support), the balance of spatial force system is established by energy method and variational principle to determine whether the box girder is overturned or not, and finally the Shangyu Chunhui Bridge is used to determine whether the box girder is overturned or not. The proposed theory is verified and the influencing factors are analyzed by the following examples: Hongfu uplink ramp bridge Guangdong and Jiangxi expressway ramp bridge and Jinjin high speed ramp bridge in the third Ring Road of Harbin. The results show that, compared with the standard calculation method, the overturn is simply regarded as the rotation of the rigid body, and the effects of the rotation of the deformable body, the rotation of the rigid body and the large rotation of the box girder on the capsizing of the bridge are considered synthetically. The critical overturning load of the four bridges obtained by the proposed method is close to the measured overturning load, and the anti-capsizing capacity of the beam bridge can be calculated safely.
【作者单位】： 清华大学水利水电工程系;交通运输部公路科学研究院;浙江工业大学建筑工程学院;
【基金】：国家自然科学基金项目(51778586) 浙江省自然科学基金项目(LY13E080014)
【分类号】：U441
本文编号：2128735
[Abstract]:In view of the hidden danger of lateral stability of single column pier girder bridge, five possible failure modes in the process of capsizing are put forward through investigation and research on the site wreckage of several single column pier girder bridges. Based on the typical failure mode, all anti-torsion bearing failure (void removal) is proposed as the criterion to judge overturn. A limited torsional bearing is used to simulate the beneficial effect of bearing size on overturning, and the overturning process of single column pier girder bridge is equivalent to the superposition of box girder deformation body rotation and rigid body rotation. The influence of the redistribution of the reaction force on the overturning of the bridge caused by the large rotation of the box girder is considered. Under two modes of bearing size (i.e. support at support point or surface support), the balance of spatial force system is established by energy method and variational principle to determine whether the box girder is overturned or not, and finally the Shangyu Chunhui Bridge is used to determine whether the box girder is overturned or not. The proposed theory is verified and the influencing factors are analyzed by the following examples: Hongfu uplink ramp bridge Guangdong and Jiangxi expressway ramp bridge and Jinjin high speed ramp bridge in the third Ring Road of Harbin. The results show that, compared with the standard calculation method, the overturn is simply regarded as the rotation of the rigid body, and the effects of the rotation of the deformable body, the rotation of the rigid body and the large rotation of the box girder on the capsizing of the bridge are considered synthetically. The critical overturning load of the four bridges obtained by the proposed method is close to the measured overturning load, and the anti-capsizing capacity of the beam bridge can be calculated safely.
【作者单位】： 清华大学水利水电工程系;交通运输部公路科学研究院;浙江工业大学建筑工程学院;
【基金】：国家自然科学基金项目(51778586) 浙江省自然科学基金项目(LY13E080014)
【分类号】：U441
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