| 基于模型修正的公路简支板梁桥荷载横向分布系数计算方法 |
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| 引用本文： | 战家旺,高胜星,闫宇智,周勇军.基于模型修正的公路简支板梁桥荷载横向分布系数计算方法[J].中国公路学报,2019,32(5):72-79. |
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| 作者姓名： | 战家旺 高胜星 闫宇智 周勇军 |
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| 作者单位： | 1. 北京交通大学 土木建筑工程学院, 北京 100044;2. 中国电建集团北京建筑规划设计研究院有限公司, 北京 100024;3. 长安大学 公路学院, 陕西 西安 710064 |
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| 基金项目： | 国家自然科学基金项目（51678032）；山西省交通建设科技项目（14-2-08，15-2-01） |
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| 摘 要： | 为了使得理论计算的桥梁荷载横向分布系数与试验结果更加吻合,并且降低静载试验成本,在铰接板法基础上,提出一种基于模型修正技术的公路简支板梁桥荷载横向分布系数简化分析方法。该方法建立了一种可以考虑板间接缝剪切变形的简化分析模型,并推导了相应的静力和动力方程。针对简化模型的结构特点,提出了以待测桥梁动力试验测得的自振频率和桥梁跨中振型构造目标函数,以竖向弹簧刚度k、扭转弹簧刚度Ψ以及剪切弹簧刚度k_q为待识别参数的模型修正方法。通过提出的模型修正方法,得到实际状态下桥梁的主要参数,以简化模型的荷载横向分布系数影响线为基础,可计算各板梁的横向分布系数;验证了不考虑板梁间接缝剪切变形时,基于简化模型的横向分布系数分析结果与铰接板梁法相同,从而证明了所提简化模型和分析方法的可靠性。最后以一座桥梁为对象,进行了动力测试,识别了简化模型的物理参数。模型修正之后的模态频率和实测值吻合良好,同时振型之间的MAC(模态保证准则)系数也接近于1,从而表明利用所提的模型修正方法可以有效识别简化模型的物理参数,使理论模型和实际桥梁吻合。
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| 关 键 词： | 桥梁工程 荷载横向分布系数 模型修正 简化模型 公路装配式简支板梁桥 |
| 收稿时间： | 2018-08-04 |
A Calculation Method for Transverse Load Distribution Coefficient of Highway Simply-supported Slab-girder Bridges Based on Model Updating |
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| ZHAN Jia-wang,GAO Sheng-xing,YAN Yu-zhi,ZHOU Yong-jun.A Calculation Method for Transverse Load Distribution Coefficient of Highway Simply-supported Slab-girder Bridges Based on Model Updating[J].China Journal of Highway and Transport,2019,32(5):72-79. |
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| Authors: | ZHAN Jia-wang GAO Sheng-xing YAN Yu-zhi ZHOU Yong-jun |
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| Affiliation: | 1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China;2. POWERCHINA Architectural Design Co., Ltd., Beijing 100024, China;3. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China |
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| Abstract: | In order to make the theoretical calculation of the transverse distribution coefficients of the bridge more consistent with the test results, and reduce the cost of the static load test, a simplified analysis method of the transverse distribution coefficients of the highway simply-supported slab-girder bridge based on the articulated slab method is proposed. This method establishes a simplified analytical model that considers the shear deformation of joints between plates. Moreover, this paper derives the corresponding static and dynamic equations. In view of the structural characteristics of the simplified model, a model updating method is also proposed, which takes the natural frequencies and modes of the bridge span measured in the dynamic test as the objective functions, and the vertical spring stiffness k, torsion spring stiffness Ψ, and shear spring stiffness kq as the parameters to be identified. The main parameters of the bridge in the actual state were obtained by the proposed model updating method. Based on the influence line of the transverse distribution coefficients of the simplified model, the transverse distribution coefficients of each plate and beam can be calculated. The results of the transverse distribution coefficient analysis based on the simplified model are the same as those of the articulated plate-beam method when the shear deformation of the indirect joint of the plate-beam is not considered, which proves the reliability of the simplified model and the analysis method. Finally, a bridge was considered as an object to perform the dynamic test and identify the physical parameters of the simplified model. The modal frequencies after the model modification are in good agreement with the measured values, and the MAC (modal assurance criterion) coefficients between the modes are close to 1. This shows that the physical parameters of the simplified model can be identified effectively by the model modification method proposed in this paper, which coincides with the theoretical model and the actual bridge. |
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| Keywords: | bridge engineering transverse load distribution coefficient model updating simplified model highway simply-supported slab-girder bridge |
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