【摘要】 以润扬长江大桥北汊斜拉桥为实际工程背景,分析了同时考虑结构整体和局部细节特性的结构行为一致多尺度模拟方法在具体应用中的实施过程。以结构健康监测和损伤评估为目标,建立斜拉桥整体结构的三维多尺度有限元模型,桥面系采用分级多重子结构方法建立结构行为一致多尺度有限元模型。对建立起来的大跨桥梁结构多尺度有限元模型进行模态分析,并利用成桥试验数据从静力响应、动力特性等方面验证了多尺度模型的有效性。结果表明:建立的多尺度模型是有效的,其计算分析结果和成桥试验值之间的误差较小;分级建立结构行为一致多尺度模型的模拟方法有利于满足在结构健康监测系统设计、结构状态评估和结构损伤检测等各个不同阶段模型分析的需求。更多还原

【Abstract】 Considering the global structural behavior and features of local details simultaneously,the whole process of implementing the concurrent multi-scale modeling of structural behavior(CMSM of SB) was discussed in details for Runyang Yangtse Cable-stayed Bridge(RYCB).For purpose of structural health monitoring and damage assessment,the three-dimension multi-scale finite element model was established for RYCB.The CMSM of SB of bridge deck was constructed using the multi-stage substructure method in different stages of structural analysis.Using the developed CMSM of SB,modal analysis was conducted and the model verification of the CMSM of SB was discussed through the experimental data on the dynamic characteristics and static response.Results show that error between calculated analysis result of CMSM and test value of bridge is small.It verifies feasibility of CMSM.Using multi-stage substructure method,the modeling of CMSM of SB will satisfy the necessity in the field of damage analysis of long-span bridges for different stages,such as the design of structural health monitoring,the structural state assessment and damage inspecting and so on.更多还原