附设黏滞阻尼器的装配式悬臂挡土墙动力响应研究

Study on dynamic response of assembled cantilever retaining wall with viscous damper

为提高装配式悬臂挡土墙抗震性能,将黏滞阻尼器附设在装配式悬臂挡土墙上,形成一种新型装配式悬臂阻尼挡土墙,通过黏滞阻尼器耗散地震能量达到减震目的。为研究该新型挡土墙的动力响应,采用ABAQUS软件,建立了两组三维有限元对比模型,一组为无滑体的阻尼悬臂挡土墙及对比模型,另一组为包含滑坡体的新型阻尼挡土墙及对比模型。对模型施以Vrancea地震波,研究了附设黏滞阻尼器的装配悬臂挡土墙抗震性能,并进行参数分析,讨论了混凝土强度、装配尺寸、阻尼器关键参数对其力学性能的影响。结果表明:附设黏滞阻尼器的装配悬臂挡土墙相较于对比模型,立板最大荷载减小约50%,最大应力减小约60%,立板最大水平位移由6.69mm减小至1.24mm,抗震性能显著提高;随着立板厚度、阻尼系数的增大,附设黏滞阻尼器的装配悬臂式挡土墙抗震性能有所提高,而混凝土强度、阻尼指数需要合理选择。

In order to improve the seismic performance of prefabricated cantilever retaining wall,a new type of prefabricated retaining wall is formed by attaching viscous dampers to it,which is expected to dissipate seismic energy through viscous dampers.ABAQUS is used to study the dynamic response of the new retaining wall,and two groups of three-dimensional finite element comparison models are established.One group is composed of the new damping cantilever retaining wall without landslide and the comparison model,and the other group is with landslide.Applying Vrancea seismic wave to these models,the seismic performance of the cantilever retaining walls assembled with viscous dampers are studied.On this basis,the parameter analysis is carried out.The effects of concrete strength,assembly size and key parameters of dampers are studied.The results show that the stress,load and horizontal displacement of the walls with viscous dampers are significantly lower than those of the comparison model.The attached viscous dampers significantly improve the seismic performance of assembled cantilever retaining wall.With the increase of the vertical plate thickness and damping coefficient,the seismic performance of the cantilever retaining wall equipped with viscous dampers is improved,while the concrete strength and damping exponent need to be chosen reasonably.