钢桥自适应分析  

Shakedown Analysis of Steel Girder Bridge

作　　者：原海燕[1] 阎贵平[1] 刘磊[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《北京交通大学学报》2008年第1期69-73,共5页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

摘　　要：自适应分析是钢桥塑性分析理论的一个新方向,它以重复载荷作用下结构的自适应现象为基础,挖掘结构的承载潜力.本文以连续钢梁桥为对象,分析了重复载荷作用下结构的特殊行为,以一个两跨连续梁为例,用增量分析法计算了结构的自适应极限载荷.分析表明:结构自适应的必要条件是卸载过程中不出现弯矩重分配;增量分析法原理清晰,适于编程.The shakedown analysis is a new research direction of the plastic theory for steel girder bridges. Based on the shakedown phenomenon of a structure subjected to repeated loads, the potential capacity of the structure can be got. Some special behaviors are concluded when continuous steel girder bridges bear repeated loads. Taking a two-span continuous beam as an example, its shakedown limit loads are calculated with the loading incremental method. The analytical results indicate that the necessary condition of shakedown is no redistribution of bending moment when the beam is unloading. The results also show that the loading incremental method is precise for shakedown analysis and is fit for programming.

关 键 词：土木建筑结构 钢梁桥 自适应分析 增量分析法 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]