铁路钢桁梁桥结构校验系数研究

发布时间：2018-07-09 14:44

本文选题：铁路桥梁 + 校验系数　；参考：《铁道建筑》2017年05期

【摘要】：以2座铁路钢桁梁桥的试验数据为基础,介绍钢桁梁结构校验系数通常值的适用条件及其特点,研究桥梁的理论内力和变形与平面、空间计算模型的相关性,分析钢桁梁挠度实测校验系数,杆件和纵、横梁应力实测校验系数的特征,提出利用实测的应力、挠度和结构校验系数定量评价桥梁强度和刚度的方法。研究结果表明:钢桁梁桥检定试验宜采用空间模型计算杆件的内力和结构变形,并由此得到结构校验系数;现有简支钢桁梁的结构校验系数通常值不适用于连续钢桁梁;采用结构校验系数换算求得设计活载下的杆件应力和桥梁挠度,可较为准确地评价桥梁结构的强度和刚度。研究结论可供相关单位桥梁检定和规范修订时参考。
[Abstract]:Based on the experimental data of two railway steel truss bridges, this paper introduces the applicable conditions and characteristics of the normal values of the check coefficients of the steel truss structures, and studies the correlation between the theoretical internal forces and deformations of the bridges and the plane and spatial calculation models. This paper analyzes the characteristics of the measured check coefficients of deflection of steel truss beams and stresses of members and longitudinal beams and beams, and puts forward a method to quantitatively evaluate the strength and stiffness of bridges by using the measured stress, deflection and structural check coefficients. The results show that the spatial model should be used to calculate the internal force and structural deformation of steel truss bridge, and the structural check coefficient of simply supported steel truss beam is not suitable for continuous steel truss beam. The structural check coefficient is used to calculate the stress of the members and the deflection of the bridge under the design live load. The strength and stiffness of the bridge structure can be evaluated more accurately. The conclusions can be used as reference for bridge verification and standard revision.
【作者单位】：中国铁道科学研究院铁道建筑研究所;
【分类号】：U446

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