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Investigation of seismicperformance of viaducts considering traffic loadings and safety of moving whieles

考虑交通荷载和行车安全的高架桥抗震性能研究

基本信息

批准号：
17360213
负责人：
KAWATANI Mitsuo
金额：
$ 10.22万
依托单位：
Kobe University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

This study is intended to investigate the seismic response of highway bridges, Shinkansen viaducts and monorail bridges under traffic loads using three-dimensional dynamic response analysis, which even considers bridge-vehicle/train interaction subjected to moderate earthquakes occurring with high probability. The running stability of vehicles on highway bridges and Shinkansen train during earthquakes is also examined. To realize the purpose of this study, a dump truck and the car of train of Shinkansen and Monorail are respectively idealized as a discrete rigid multi-body system with 12 degrees of freedom (DOFs) and 15DOFs. Those vehicle and train models comprise the motions relating to the lateral direction, such as sway and yawing motions, during earthquakes.Observations through a numerical analysis demonstrate that the existence of heavy vehicles and trains, which are also dynamic system, can affect the seismic response of bridges: the dynamic system of vehicles and trains acts as … More a damper on the bridges during earthquakes. That fact especially shows that the existing railway design including monorail bridges, which considers a train as additional mass, yields a conservative result. It is also observed that moving vehicles on highway bridges may experience the slip more frequently in comparison with stationary vehicles. Moreover, during earthquakes vehicles on viaducts becomes easy to slip comparing with those on roadways. The derailment assessment of Shinalkansen train using the derailment coefficient clarifies that the derailment coefficient increases with increasing train speeds. Investigations for the seismic response of monorail trains reveal that the seismic responses of the advanced bridges are greater than those of the conventional monorail bridges because of the simplified structural system and increased girder weight that is attributable to composite girders of the advanced bridges. Moreover, the train on the advanced bridge shows greater dynamic response than that on the conventional bridge. Less

本研究的目的是调查地震反应的公路桥梁，新干线高架桥和单轨桥梁交通荷载下使用三维动态响应分析，其中甚至考虑桥梁-车辆/列车相互作用受到中等地震发生的概率很高。此外，还对地震时公路桥梁和新干线列车上车辆的行驶稳定性进行了研究。为了实现本研究的目的，自卸车和新干线和单轨列车的车厢分别理想化为12自由度（DOF）和15自由度的离散多刚体系统。这些车辆和列车模型包含了地震时与横向有关的运动，如摇摆和偏航运动。通过数值分析的观测表明，重型车辆和列车的存在也是动力系统，它们会影响桥梁的地震反应：车辆和列车的动力系统作为桥梁的动力系统， ...更多信息地震时桥梁上的减震器。这一事实特别表明，包括单轨桥梁在内的现有铁路设计将列车视为附加质量，得出了保守的结果。还观察到，与静止车辆相比，公路桥上的移动车辆可能更频繁地经历滑移。此外，在地震时，高架桥上的车辆比公路上的车辆更容易打滑。利用脱轨系数对新干线列车进行脱轨评估，结果表明脱轨系数随列车速度的提高而增大。单轨列车的地震反应的调查表明，先进的桥梁的地震反应大于传统的单轨桥梁，因为简化了结构体系和梁的重量增加，这是由于先进的桥梁的组合梁。此外，列车在先进桥梁上的动力响应比在常规桥梁上的动力响应大。少