【作者】 肖新标； 沈火明；

【Author】 XIAO Xin biao,SHEN Huo ming (Dept. of Appl. Mechanics and Eng., Southwest Jiaotong University, Chengdu 610031, China)

【机构】 西南交通大学应用力学与工程系；

【摘要】 在移动荷载作用下桥梁运动方程的基础上,采用Newmark法,考虑移动荷载质量、速度和桥梁高阶固有频率的影响,对移动荷载作用下简支梁的动态响应进行了研究。对桥梁在荷载速度从4 0～2 0 0km/h连续变化的情况下的动力系数进行计算分析。结果表明:最大动挠度都发生在跨中位置附近,移动荷载作用下的挠度曲线是以一定的频率围绕静挠度线的一种类正弦波更多还原

【Abstract】 The dynamic responses of simply supported beams under the action of moving loads are studied based on the kinematics equations and by taking the mass and speed of the moving object and the high order natural frequencies of the beam into consideration. The equations are solved with Newmard method. Dynamic load factors are determined as the speed of moving loads increase from 40 km/h to 200 km/h. The results show that the maximum deflection is always near the center of the span, and the deflection curves actuated by moving loads are a kind of sinusoidal ones that swing in a certain frequency around a deflection curve caused by a static load.更多还原