| 缓冲型防落梁钢圈限位装置力学性能试验 |
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| 引用本文： | 王占飞,张强,李航,孙巨搏,葛汉彬.缓冲型防落梁钢圈限位装置力学性能试验[J].中国公路学报,2021,34(2):256-264. |
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| 作者姓名： | 王占飞 张强 李航 孙巨搏 葛汉彬 |
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| 作者单位： | 1. 沈阳建筑大学交通工程学院, 辽宁沈阳 110168;2. 南京工业大学土木工程学院, 江苏南京 211816;3. 名城大学土木工程系, 爱知名古屋 468-8502 |
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| 基金项目： | 国家自然科学基金重点项目(51938009)。 |
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| 摘 要： | 经合理设计的防落梁限位装置可以有效减小地震发生时桥梁上、下部结构间的相对位移，阻止落梁破坏的发生，而明确限位装置力学性能是对其进行合理设计的必要前提。为探明缓冲型防落梁钢圈限位装置的滞回性能和破坏模式，并提出极限位移和极限承载力的计算方法，制作了6个试件进行拟静力试验研究。分析了钢材种类、限位装置截面高度h和直线段长度a等设计参数对其力学性能的影响，试验结果表明：①在初期的加、卸载过程中，试件以弯曲变形为主，刚度及承载力低。由于弧段部位过早出现塑性，卸载后出现永久性变形；试件在反复加载过程中，累计塑性变形增加，后期以拉伸变形为主，刚度大。试件达到最大承载力后，发生颈缩、断裂破坏，最终丧失承载能力。②分析试件圆弧段测得的应变，加载初期内侧受拉，外侧受压；随着位移的增加，弧段外侧达到最大压应变后，试件被拉直，中性轴偏离截面形心；破坏时，试件各部位均出现较大的拉应变。③参数a对试件启动限位功能时机影响较大，对试件初期刚度几乎没有影响；参数h增加时，承载力的增长速率、初期刚度以及最大承载力均增加，但对位移影响较小；改变钢材种类对承载力影响较大，对位移影响较小。在试验研究的基础上，提出了该类限位装置的极限承载力与极限位移计算公式，并验证了计算公式的有效性。
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| 关 键 词： | 桥梁工程 钢圈限位装置 拟静力试验 力学性能 缓冲能力 |
| 收稿时间： | 2019-12-06 |
Experimental Study on Mechanical Properties of Steel Ring Restrainers with Buffer Capacity |
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| WANG Zhan-fei,ZHANG Qiang,LI Hang,SUN Ju-bo,GE Han-bin.Experimental Study on Mechanical Properties of Steel Ring Restrainers with Buffer Capacity[J].China Journal of Highway and Transport,2021,34(2):256-264. |
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| Authors: | WANG Zhan-fei ZHANG Qiang LI Hang SUN Ju-bo GE Han-bin |
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| Affiliation: | 1. School of Traffic Engineering, Shenyang Jianzhu University, Shenyang 110168, Liaoning, China;2. School of Civil Engineering, Nanjing Tech University, Nanjing 211816, Jiangsu, China;3. Department of Civil Engineering, Meijo University, Nagoya 468-8502, Aichi, Japan |
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| Abstract: | Reasonably designed restrainers can effectively reduce the relative displacement between superstructures and substructures of bridges during earthquakes,and prevent the occurrence of unseating damage.The verified mechanical properties of restrainers are a necessary prerequisite for their reasonable design.Quasi-static tests were carried out on six manufactured specimens to study the hysteretic behavior and failure mode of a new type of steel ring restrainer with buffer capacity,and establish a method for calculating the ultimate displacement and ultimate bearing capacity.In this study,the influences of design parameters such as the type of steel,section height h,and straight length aon the mechanical properties are evaluated.According to the results,it was deduced that:①during the initial loading and unloading process,the specimens are mainly governed by bending deformation,whereas the effects of the stiffness and force are minor.Because of the early occurrence of plasticity of the arc segment,unrecoverable deformation occurs after unloading.The accumulative plastic deformation is increased during the repeated loading process.In the later stage of loading,the deformation of the specimens is mainly because of tension,and a large stiffness is observed.Necking appears and a fracture occurs after the ultimate bearing capacity;②for the strain measured at the arc segment of the specimens during the initial loading,the inside and outside surfaces of the section are in tension and compression,respectively.With the increase in displacement,the specimen is straightened and the neutral axis is off-center of the section after the outside section reaches the maximum compressive strain.When failure occurs,high tensile strain occurs in all parts of the test specimen;③ahas a significant effect on the start-restraint displacement,but the effect of the initial stiffness is slight.When hincreases,the growth rate of the force,initial stiffness,and ultimate bearing capacity increase;however,the effect on the displacement is small.The type of steel has a significant effect on the bearing capacity of the specimen but has little effect on the displacement.Formulas for calculating the ultimate bearing capacity and displacement are proposed based on the experimental results,and their accuracy is verified. |
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| Keywords: | bridge engineering steel ring restrainer quasi-static test mechanical property buffer capacity |
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