作　　者： ; ; ; ;

机构地区： 北京工业大学建筑工程学院工程抗震与结构诊治北京市重点实验室

出　　处： 《振动．测试与诊断》 2009年第1期66-70,共5页

摘　　要： 将简支梁作为钢筋混凝土简支梁桥的结构简化模型,对其加载损伤后的振动耗能特征进行试验研究。通过静力加载试验模拟简支梁的损伤累积过程,通过突加荷载试验跟踪简支梁振动耗能特征随加载损伤等级的变化,深入分析了阻尼比随裂缝损伤状态的变化机理,并在此基础上提出了描述结构振动耗能特征的指标——相邻周期耗能比。分析结果表明,该指标能够比较敏感地反映裂缝型损伤的程度变化,具有较好的噪声鲁棒性,可以作为钢筋混凝土简支梁桥的损伤检测指标。 A simply-supported reinforced concrete beam bridge was chosen to investigate its dissipative characteristics.The accumulated damage of the beam was simulated by a static loading test,and the change of dissipative characteristics with loading damage was tracked by a shock loading test.The mechanics of damping ratio's change with crack damage was analyzed,and a new index of dissipative characteristic(adjacent periods' dissipative ratio) was presented.The analysis results show that the new index is sensitive to the severity of crack damage and has good noise immunity.So it can be used as a damage index for simply-supported reinforced concrete beams.

关 键 词： 钢筋混凝土简支梁 加载损伤 耗能特征 阻尼比 相邻周期耗能比

领　　域： [机械工程] [建筑科学]