城市交通诱发结构二次振动分析与数值模拟  

Analysis and Numerical Simulation of Structural Secondary Vibration Induced by Urban Traffic

作　　者：常乐[1] 任珉[2] 闫维明[1] 周福霖[2] 

机构地区：[1]北京工业大学,工程抗震与结构诊治北京市重点实验室,北京100124 [2]广州大学,工程抗震研究中心,广州510405

出　　处：《北京工业大学学报》2009年第5期598-602,共5页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(50578046);广东省自然科学基金资助项目(5001878);广州市科技计划资助项目(2005j1-c0371).

摘　　要：为了研究结构二次振动的振动特点及发生机理,建立了理论分析模型,并推导了运动方程.分析结果表明,结构二次振动实质为结构内部构件与外部激励中的与其自振频率相近频段发生的共振反应,框架结构的二次振动主要表现为楼板和梁等结构构件与外部激励的谐振.结合工程实际,通过数值模拟分析了一栋7层框架结构分别在高架路、地铁和轻轨交通诱发地面振动激励下的二次振动响应,验证了提出的理论模型和分析的正确性.To study the characteristics and the generation mechanism of the secondary vibration,a theoretical model is built up and the dynamic equations are derived.Analysis results show that the structural secondary vibration is a resonance vibration of some components such as beams and floors,under the traffic-induced vibration excitation with a close dominant frequency to the components.Based on a real project,a 7-story frame structure,the internal secondary vibration reoccurred under different traffic vibrations excitated by elevated road,subway,and light railway,respectively,which validated the feasibility of the proposed theoretical model and the derivation of structural secondary vibration in this paper.

关 键 词：环境振动 高架路 地铁 二次振动 

分 类 号：TU311.3[建筑科学—结构工程]