基于精细积分方法的桥梁结构移动荷载识别  

DYNAMIC MOVING LOAD IDENTIFICATION FOR BRIDGE STRUCTURES BASED ON PRECISE INTEGRATION METHOD

作　　者：侯秀慧[1] 邓子辰[1] 黄立新[1] 

机构地区：[1]西北工业大学力学与土木建筑学院,西安710072

出　　处：《振动与冲击》2007年第9期142-145,154,共5页Journal of Vibration and Shock

基　　金：国家自然基金(10372084和10572119);教育部新世纪优秀人才支持计划(NCET-04-0958);大连理工大学工业装备结构分析国家重点实验室开放基金;西北工业大学创新种子基金(Z200730)资助

摘　　要：针对桥梁结构移动荷载识别问题,有效地将桥梁结构振动微分方程化为精细积分方法的一般格式,进而将精细积分方法推广于荷载作用点随时间连续变化的移动荷载的识别问题中,以HPD-S精细积分格式为基础,推导出相应的荷载识别公式,并与以HPD-L精细积分格式为基础的荷载识别方法进行了比较。仿真算例表明,无论对于简谐变化还是线性变化的外荷载,即使采用较大的时间步长,前者仍具有很高的识别精度;同时对后者进行了修正,也得到了令人满意的识别效果。The vibration differential equation of bridge structures is converted into the general format of precise integration method (PIM). As a result, PIM is extended to problems with moving loads. A model of load identification based on the HPD-S format of PIM is constructed and numerical results are compared with those based on the HPD-L format of PIM. It is shown that the former model exhibits higher precision even to larger time interval step and whatever load pattern is adopted. And the method developed to modify the latter model is also proved to be effective.

关 键 词：荷载识别 精细积分 桥梁结构 移动荷载 

分 类 号：TU311[建筑科学—结构工程]