移动荷载速度对简支梁动态响应影响分析
李奉阁1，杨慧1，赵燕2
( 1.内蒙古科技大学 建筑与土木工程学院，内蒙古 包头 014010；2.包头市建设工程施工图审查中心, 内蒙古 包头 014010)
关键词：简支梁；移动荷载；速度连续；动力挠度；响应分析
中文分类号：TU312+.1 文献标识码：A
摘要：基于振型叠加原理，采用广义坐标变换的方式建立了移动荷载匀速通过简支梁桥时系统的动力平衡微分方程。在速度的连续区间上，结合荷载运动位置，研究车速对桥梁结构动力挠度响应的影响。结果表明：跨中挠度是梁上的最大挠度点；跨中挠度最大时，荷载并不总是在跨中位置，而是随着速度的变化而变化。
Analysis of the influence of mobile load speed on the dynamic responses of the simply supported beams
LI Feng-ge1, YANG Hui1, ZHAO Yan2
(1.Architecture and Civil Engineering School, Inner Mongolia University of Science and Technology，Baotou014010，China;2.Baotou construction plan examination centre , Baotou 014010，China)
Key Words:simplysupported beam;moving load;velocity continuous;kinetic deflection;response analysis
Abstract: Based on the mode superposition method, the generalized coordinate transformation method was used to establish the dynamic equilibrium equation of the system when the moving loads get through the simply supported beam bridgeat a uniform speed. The effect of speed on the dynamic deflection response of the bridge structurein the continuous interval of the speed combined with the movement load position was studied. It was found out that themid-span deflection is the biggest along the beam.When the mid-span deflection reaches its maximum , loading is not always located in the cross, but changes with the speed.