多个移动车辆作用下简支梁的动力响应分析_盛国刚.pdfVIP

23 12 Vol.23 No.12 2006 12 Dec. 2006 ENGINEERING MECHANICS 154 1000-4750(2006)12-0154-05 * ( 410076) - - TU311.3; U441.2A DYNAMIC ANALYSIS OF A SIMPLY-SUPPORTED BEAM SUBJECTED TO MOVING VEHICLES * SHENG Guo-gang , LI Chuan-xi , ZHAO Bing (School of Bridge and Structure Engineering, Changsha University of Science and Technology, Changsha 410076, China) Abstract: The dynamic behavior of bridge structures under moving vehicular loads is studied. The vehicle is modeled as a four-DOF system with linear suspensions and tire flexibility, and the bridge is modeled as a continuous Euler-Bernoulli beam simply supported at both ends. A mathematical model is adopted to describe the roughness of the contact surface between the vehicles and the bridge. The partial differential equation governing coupled vibration of moving vehicles and beam structure is derived. The equation is solved in the time domain by modal analysis and Newmark method. In the numerical examples, the impact coefficient of the bridge is obtained. The shear force and bending moment of the beam are calculated. The dynamic responses of the bridge are simulated with different loads, vehicle speeds, bridge surface roughness, and the span of the beam. Key words: bridge; moving load; vehicle; vehicle-bridge interaction; road roughness — [1~7] ( )