连续体系桥梁的主动及混合控制抗震研究

发布时间：2019-08-14 12:09

【摘要】：为研究连续梁桥及刚构桥的主动及混合控制抗震效果,以某4×50m单箱预应力混凝土桥为例,采用基于支座初始刚度的LQG主动控制法进行抗震研究。采用MATLAB编程,建立空间梁单元有限元模型,通过震动控制仿真平台NLAHC1.0对有限元模型施加LQG主动控制,加入主动施力器及传感器,采用模态缩减技术及Kalman滤波器建立控制模型,对连续梁桥和刚构桥的墩底横桥向弯矩及支座的剪力~位移曲线进行分析,并提出了一种新的改进控制法。结果表明:主动控制抗震方法能显著减小刚构桥的墩底弯矩,而混合控制抗震方法不能有效减小连续梁桥的墩底弯矩;考虑支座非线性引起的结构刚度矩阵变化,改进控制法对混合控制连续梁桥的减震效果明显。
[Abstract]:In order to study the active and hybrid control seismic effect of continuous beam bridge and rigid frame bridge, a 4 脳 50m single box prestressed concrete bridge is taken as an example to study the seismic resistance of a 4 脳 50m single box prestressed concrete bridge by LQG active control method based on the initial stiffness of the bearing. The finite element model of spatial beam element is established by MATLAB programming, the active control of finite element model is applied to the finite element model by vibration control simulation platform NLAHC1.0, the active force builder and sensor are added, the control model is established by using modal reduction technology and Kalman filter, the transverse bending moment of pier bottom of continuous beam bridge and rigid frame bridge and the shear displacement curve of support are analyzed, and a new improved control method is put forward. The results show that the active control seismic method can significantly reduce the pier bottom bending moment of the rigid frame bridge, while the hybrid control seismic method can not effectively reduce the pier bottom bending moment of the continuous beam bridge, and considering the change of the structural stiffness matrix caused by the nonlinear bearing, the improved control method has obvious damping effect on the hybrid control continuous beam bridge.
【作者单位】：中铁第四勘察设计院集团有限公司;
【分类号】：U442.55

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