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| 钢管混凝土系杆拱桥车桥耦合振动分析 | |
| 引用本文： | 杨建荣,李建中,申俊昕.钢管混凝土系杆拱桥车桥耦合振动分析[J].北京工业大学学报,2012,38(6):847-853. |
| 作者姓名： | 杨建荣 李建中 申俊昕 |
| 作者单位： | 1. 昆明理工大学建筑工程学院,昆明,650500 2. 同济大学桥梁工程系,上海,200092 3. 云南省交通规划设计研究院,昆明,650011 |
| 基金项目： | 云南省应用基础研究面上项目资助，昆明理工大学科学研究基金资助 |
| 摘 要： | 为了研究钢管混凝土系杆拱桥在车辆荷载作用下的动力冲击效应,综合采用包括空间梁、板和杆单元的桥梁结构有限元模型和三维7自由度车辆模型,通过数值模拟车、桥动力相互作用,计算得到桥梁的位移、内力响应及对应动力放大系数,研究桥梁不同构件所受到的动力冲击作用及主要影响因素,分析桥梁不同位置加速度响应的频谱特征.结果表明,桥梁局部构件的动力冲击系数常超过规范取值,且路面不平度是最主要的影响因素;长、短吊杆的动力冲击系数差异很大,短吊杆的受力和抗疲劳性能远低于长吊杆. |
| 关 键 词： | 车桥耦合 钢管混凝土 系杆拱桥 动力放大系数 |
Numerical Investigation of Concrete-filled Steel Tubular Tied-arch Bridge Under Travelling Vehicles |
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| YANG Jian-rong,LI Jian-zhong,SHEN Jun-xin.Numerical Investigation of Concrete-filled Steel Tubular Tied-arch Bridge Under Travelling Vehicles[J].Journal of Beijing Polytechnic University,2012,38(6):847-853. | |
| Authors: | YANG Jian-rong LI Jian-zhong SHEN Jun-xin |
| Affiliation: | 1.Faculty of Civil Engineering and Architecture,Kunming University of Science and Technology,Kunming 650500,China; 2.Department of Bridge Engineering,Tongji University,Shanghai 200092,China; 3.Broadvision Engineering Consultants,Kunming 650011,China) |
| Abstract: | A theoretical research work in relation to the dynamic impact effects of concrete-filled steel tubular tied-arch bridge under travelling vehicles was described.The mathematical model assumed a finite element representation of the bridge together with beam,shell,and link elements.And the vehicle simulation employed a 3 dimensional linear vehicle model with 7 independent degrees of freedom.In this way,the dynamic interaction between the bridge and vehicle model was simulated.And the dynamic amplification factors were computed for displacement and internal force respectively.The impact effects of vehicle on different bridge members and the influencing factors were studied.Meanwhile the acceleration responses of some bridge components were analyzed in the frequency domain.The dynamic amplification factors of some structural elements may exceed those specified in the design codes.And road surface roughness seems to be one of the major influencing factors.Compared to the longer hangers,the shorter ones can be ore frequently suffer from mechanical or fatigue failures. |
| Keywords: | vehicle bridge coupling concrete-filled steel tube tied-arch bridge dynamic amplification factor |
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