Ride comfort and impact factor of a seven-span continuous cable-stayed bridge

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
Chul-Woo Kim, Shinya Kimura, Hiroki Sugiyama, Akinori Sato, Kazuyuki Ono
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Abstract

This study was conducted to investigate the vibration serviceability and impact coefficient of a seven-span continuous cable-stayed bridge planned for an expressway extension using a three-dimensional vehicle–bridge coupled vibration analysis. For the bridge design, deflection under the designed live load of the continuous cable-stayed bridge did not meet the deflection limit specified in “Japanese Design Specifications for Highway Bridges.” The excessive deflection indicates the possibility of poor vibration serviceability. To clarify the bridge vibration serviceability, the dynamic responses of the bridge and passing vehicles were examined using the three-dimensional vehicle–bridge coupled vibration analysis. The three-dimensional analysis was validated by comparing the vibration response of a single-span steel cable-stayed bridge in service subjected to vehicle running tests with those numerical responses from the three-dimensional analysis. The ride comfort of vehicles on the bridge was assessed in terms of vibration serviceability according to the ISO 2613-1 international standard for evaluating whole-body vibration exposure. The observation from the simulation-based investigation demonstrated that the vehicle response does not exceed the ride comfort limit irrespective of vehicle, road, and running conditions. In other words, the findings confirmed a negligible effect of large deflections on driving safety. The impact factors were found to be less than 1.05 for the main girder, less than 1.03 for the main tower base, and less than 1.04 for the cable. The impact factor was greatest when several vehicles were running at resonant headway.
七跨连续斜拉桥的乘坐舒适性和冲击系数
本研究采用三维车辆-桥梁耦合振动分析方法,对计划用于高速公路扩建的七跨连续斜拉桥的振动适用性和冲击系数进行了研究。在桥梁设计中,连续斜拉桥在设计活载作用下的挠度不符合 "日本公路桥梁设计规范 "中规定的挠度限值。过大的挠度表明振动适用性可能很差。为明确桥梁的振动适用性,采用三维车辆-桥梁耦合振动分析法对桥梁和过往车辆的动态响应进行了研究。通过比较一座单跨钢斜拉桥在车辆行驶试验中的振动响应与三维分析得出的数值响应,验证了三维分析的有效性。根据 ISO 2613-1 评估全身振动暴露的国际标准,从振动适用性的角度对桥梁上车辆的乘坐舒适性进行了评估。模拟调查的结果表明,无论车辆、道路和运行条件如何,车辆的响应都不会超过乘坐舒适性的限制。换句话说,研究结果证实大偏差对驾驶安全的影响可以忽略不计。研究发现,主梁的影响系数小于 1.05,主塔基的影响系数小于 1.03,拉索的影响系数小于 1.04。当多辆车以共振车速行驶时,影响系数最大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
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