异形钢拱人行桥通行舒适度及其控制研究
发布时间：2018-10-09 19:54
【摘要】：异形钢拱桥属于较柔的体系桥梁,结构基频很难满足现行规范3Hz的要求,其结果有可能会使人致振动响应增大,引发通行舒适度问题;实践中对于类似桥梁通过调整结构体系或刚度也很难满足3Hz的基频要求,即使满足基频要求,也有可能使这类桥梁优势减少或造价增大许多而不经济。因此,开展异形钢拱人行桥通行舒适度及其振动控制研究,探索类似桥梁是否一定要满足3Hz的基频要求,具有一定的现实意义和工程应用价值。本文选用温岭市两座异形钢拱人行桥为研究背景,首先提出了本文建议的通行舒适度评价体系和方法并验证其可行性,然后利用本文建议的通行舒适度评价体系和方法对背景工程进行舒适度评价,最后对两座异形钢拱人行桥进行减振设计。具体研究工作和结论如下:1、提出了本文建议的通行舒适度评价体系及采用既有大型有限元软件Midas Civil/2013实现了复杂人行桥人致振动响应的数值计算方法;并利用本文建议的通行舒适度评价体系和方法对文献中的理工一桥和锡铁山站旅客跨线天桥进行了舒适度评价,得到的舒适度评价结果与文献研究方法得到的舒适度评价结果一致,验证了本文建议的通行舒适度评价体系和方法是切实可行的,可以为同类型的桥梁设计计算及概念设计提供参考;2、运用有限元软件Midas Civil2013、SAP2000 V15和ANSYS对温岭市两座异形钢拱人行桥进行动力特性分析与比较,并运用本文建议的人行桥通行舒适度评价体系和方法对两座异形钢拱人行桥进行通行舒适度评价,结果表明:(1)即使结构基频小于规范规定的3Hz的要求,但在正常人行情况下通行舒适度也能满足要求;(2)虽然锦屏公园步行桥的二阶自振频率2f?3.6895Hz已经大于规范规定的3Hz的要求,但在密集人群作用下也有可能发生人致振动舒适性的问题,说明中国人行天桥规范规定的安全自振频率限值值得商榷;3、系统总结了带减振系统的人行桥结构动力特性,重点对调谐质量阻尼器(TMD)的减振原理、设计应用方法进行了分析,并对TMD设计参数进行了优化;4、利用调谐质量阻尼器对两座异形钢拱人行桥进行减振设计,通过对比设置TMD减振装置前后人行桥的人致振动加速度大小,得到翁岙河桥人行桥部分的最大减振率为96.8%,锦屏公园步行桥的减振率可达55.6%,说明设置TMD减振装置后减振效果明显。
[Abstract]:Special-shaped steel arch bridge belongs to a flexible system bridge, the fundamental frequency of the structure is difficult to meet the requirements of the current code 3Hz, the result may cause the increase of human-induced vibration response and cause the problem of traffic comfort. In practice, it is difficult for similar bridges to meet the fundamental frequency requirements of 3Hz by adjusting the structure system or stiffness. Even if the fundamental frequency requirements are satisfied, it is possible to reduce the advantages or increase the cost of such bridges without economy. Therefore, it is of practical significance and engineering application value to study the traffic comfort and vibration control of the steel-arch footbridge with special-shaped steel arch, and to explore whether the similar bridges must meet the fundamental frequency requirements of 3Hz. In this paper, two special-shaped steel arch footbridges in Wenling City are selected as the research background. First of all, the evaluation system and method of the traffic comfort degree proposed in this paper are put forward and its feasibility is verified. Then the comfort evaluation system and method proposed in this paper are used to evaluate the comfort degree of the background engineering. Finally, the vibration absorption design of two special-shaped steel arch footbridges is carried out. The concrete research work and conclusion are as follows: 1. The proposed evaluation system of traffic comfort and the numerical calculation method of the man-made vibration response of complex footbridge are realized by using the existing large finite element software Midas Civil/2013. And using the evaluation system and method of the traffic comfort degree suggested in this paper, the comfort degree of the passenger cross-line flyover of the Polytechnic first Bridge and the Xitieshan Station in the literature has been evaluated. The result of comfort evaluation is consistent with that of literature research, which verifies that the evaluation system and method proposed in this paper are feasible. This paper provides a reference for the design calculation and conceptual design of the same type of bridges. The dynamic characteristics of two special-shaped steel arch footbridges in Wenling City are analyzed and compared by using the finite element software Midas Civil2013,SAP2000 V15 and ANSYS. The results show that: (1) even though the fundamental frequency of the structure is less than the requirement of 3Hz as specified in the code, the evaluation system and method of pedestrian comfort degree of pedestrian bridge proposed in this paper are used to evaluate the traffic comfort degree of two special-shaped steel arch footbridges, and the results show that: (1) even though the fundamental frequency of the structure is less than the requirement of 3Hz, But under normal pedestrian conditions, the traffic comfort can also meet the requirements; (2) although the second order natural vibration frequency of the Jinping Park pedestrian bridge 2f? 3.6895Hz has already exceeded the requirements of the 3Hz specified in the specification, but the problem of human vibration comfort may also occur under the action of a dense crowd. This paper explains that the limit value of safe natural vibration frequency stipulated by Chinese footbridge code is worth discussing 3, systematically summarizes the dynamic characteristics of footbridge structure with damping system, and emphatically analyzes the vibration absorption principle of tuned mass damper (TMD) and the design and application method. The design parameters of TMD are optimized and tuned mass dampers are used to design two special-shaped steel arch footbridges. The acceleration caused by human vibration is compared before and after the installation of TMD damping devices. The results show that the maximum damping rate of the pedestrian bridge of Weng'ao River Bridge is 96.8, and that of the walking bridge in Jinping Park can reach 55.6, which shows that the effect of vibration reduction is obvious after the installation of TMD damping device.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442
本文编号：2260579
[Abstract]:Special-shaped steel arch bridge belongs to a flexible system bridge, the fundamental frequency of the structure is difficult to meet the requirements of the current code 3Hz, the result may cause the increase of human-induced vibration response and cause the problem of traffic comfort. In practice, it is difficult for similar bridges to meet the fundamental frequency requirements of 3Hz by adjusting the structure system or stiffness. Even if the fundamental frequency requirements are satisfied, it is possible to reduce the advantages or increase the cost of such bridges without economy. Therefore, it is of practical significance and engineering application value to study the traffic comfort and vibration control of the steel-arch footbridge with special-shaped steel arch, and to explore whether the similar bridges must meet the fundamental frequency requirements of 3Hz. In this paper, two special-shaped steel arch footbridges in Wenling City are selected as the research background. First of all, the evaluation system and method of the traffic comfort degree proposed in this paper are put forward and its feasibility is verified. Then the comfort evaluation system and method proposed in this paper are used to evaluate the comfort degree of the background engineering. Finally, the vibration absorption design of two special-shaped steel arch footbridges is carried out. The concrete research work and conclusion are as follows: 1. The proposed evaluation system of traffic comfort and the numerical calculation method of the man-made vibration response of complex footbridge are realized by using the existing large finite element software Midas Civil/2013. And using the evaluation system and method of the traffic comfort degree suggested in this paper, the comfort degree of the passenger cross-line flyover of the Polytechnic first Bridge and the Xitieshan Station in the literature has been evaluated. The result of comfort evaluation is consistent with that of literature research, which verifies that the evaluation system and method proposed in this paper are feasible. This paper provides a reference for the design calculation and conceptual design of the same type of bridges. The dynamic characteristics of two special-shaped steel arch footbridges in Wenling City are analyzed and compared by using the finite element software Midas Civil2013,SAP2000 V15 and ANSYS. The results show that: (1) even though the fundamental frequency of the structure is less than the requirement of 3Hz as specified in the code, the evaluation system and method of pedestrian comfort degree of pedestrian bridge proposed in this paper are used to evaluate the traffic comfort degree of two special-shaped steel arch footbridges, and the results show that: (1) even though the fundamental frequency of the structure is less than the requirement of 3Hz, But under normal pedestrian conditions, the traffic comfort can also meet the requirements; (2) although the second order natural vibration frequency of the Jinping Park pedestrian bridge 2f? 3.6895Hz has already exceeded the requirements of the 3Hz specified in the specification, but the problem of human vibration comfort may also occur under the action of a dense crowd. This paper explains that the limit value of safe natural vibration frequency stipulated by Chinese footbridge code is worth discussing 3, systematically summarizes the dynamic characteristics of footbridge structure with damping system, and emphatically analyzes the vibration absorption principle of tuned mass damper (TMD) and the design and application method. The design parameters of TMD are optimized and tuned mass dampers are used to design two special-shaped steel arch footbridges. The acceleration caused by human vibration is compared before and after the installation of TMD damping devices. The results show that the maximum damping rate of the pedestrian bridge of Weng'ao River Bridge is 96.8, and that of the walking bridge in Jinping Park can reach 55.6, which shows that the effect of vibration reduction is obvious after the installation of TMD damping device.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442
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1 陈琳琳;交通荷载及人行荷载作用下人行天桥振动舒适度研究[D];武汉理工大学;2012年
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