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通过实测和理论分析,研究了一座三跨斜桥的动力响应。该桥采用钢主梁,钢筋混凝土桥面结构和弹性体支座。该项研究通过在现场大规模布设由无线传感器网络支持的加速度计获取了振型参数。通过输出系统识别技术,提取了结构前20阶自振频率、阻尼比和振型。借助于三维有限元法,完成了结构线性动力响应分析,并将基于美国桥梁设计规范规定的多振型谱分析最低要求得到的计算结果和现场实测结果进行了比较。分别根据美国和澳大利亚桥梁设计规范计算了理想约束下的支座在压、剪、弯状态下的线弹性刚度。研究结果表明:按照每种设计规范计算支座刚度,对钢筋混凝土弹性体支座支承的桥梁进行线性动力分析,所得到的多阵型位移值相关性强且偏于安全。
Through the measurement and theoretical analysis, the dynamic response of a three-span inclined bridge is studied. The bridge uses steel girder, reinforced concrete deck structure and elastomer bearing. The study obtained the modal parameters by mass deployment of accelerometers supported by wireless sensor networks in the field. Through the output system identification technology, extracted the first 20 natural frequencies, damping ratio and vibration mode. With the aid of 3D finite element method, the linear dynamic response of the structure was completed and the calculation results based on the minimum requirements of multimodal spectrum analysis specified by the American Bridge Design Code were compared with the field measurements. According to the bridge design codes of the United States and Australia respectively, the linear elastic stiffness of the support under pressure, shear and bending conditions is calculated. The results show that the stiffness of the bearing is calculated according to each design criterion, and the linear dynamic analysis of the bridge supported by the bearing of the reinforced concrete elastic body is carried out. The obtained multi-type displacement value is highly correlated and safe.