Investigation of DSSI Effects on the Dynamic Response of an Overpass Bridge through the Use of Mobile Shakers and Numerical Simulations
Investigation of DSSI Effects on the Dynamic Response of an Overpass Bridge through the Use of Mobile Shakers and Numerical Simulations
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通过使用移动振动台和数值模拟研究 DSSI 对立交桥动态响应的影响
DOI：
10.1061/(asce)be.1943-5592.0001856
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发表时间：
2022
影响因子：
3.6
通讯作者：
DeVitis, John
中科院分区：
文献类型：
--
作者：
Farrag, Sharef;Gucunski, Nenad;Cox, Brady;Menq, Farnyuh;Moon, Franklin;DeVitis, John
在各种动力响应分析和桥梁设计中，一般都假定基础是固定的。然而，地基的柔韧性和土壤系统对能量的吸收和辐射会改变桥梁对动力荷载的响应。这种结构、基础和土壤之间的相互作用，在某些情况下甚至可能改变通过地面传递的动荷载，通常被称为土-结构动力相互作用（DSSI）。DSSI对桥梁的响应，特别是力和位移，可能有不利的影响，也可能有有利的影响。这些影响取决于几个因素，如刚度比（结构的刚度与基础系统的刚度之比）、长细比（结构的高度与基础宽度之比）、基础类型以及结构相对于所涉及的基础系统的质量。本文通过试验研究和数值模拟，推导了实际桥梁的动力特性。研究集中在运行活载水平下DSSI效应的显著性评价。这座桥的震动使用了T-Rex，这是一种来自国家灾害工程研究基础设施（NHERI）设施的大振幅移动式振动筛。建立了两个有限元模型来评估DSSI对桥梁动力响应的影响。一个模型包含包含DSSI效应的要素，而另一个模型具有固定基数的边界条件。在峰值响应幅值、识别出的固有频率和模态方面，DSSI有限元模型的响应比固定基模型的响应更符合现场结果。此外，与固定基础模型相比，纳入DSSI效应的模型导致桥梁各部件的应力水平降低。研究结果适用于具有相似特征和场地条件的桥梁。
A fixed base is generally assumed in various dynamic response analyses and the design of bridges. However, soil–foundation flexibility and energy absorption and radiation by the soil system can alter the response of bridges to dynamic loads. This interaction between the structure, foundation, and soil, which in some cases may even change the dynamic load transmitted through the ground, is, in general, referred to as dynamic soil–structure interaction (DSSI). DSSI can either have detrimental or beneficial effects on a bridge response, particularly forces and displacements. These effects depend on several factors such as the rigidity ratio (ratio of the stiffness of the structure to the same of the soil–foundation system), slenderness ratio (height of the structure to the base width ratio), the foundation type, and the mass of the structure relative to the mass of the engaged soil–foundation system. In this paper, the dynamic characteristics of an actual bridge are inferred via an experimental study and numerical simulations. The research concentrated on the evaluation of the significance of DSSI effects under operational live load levels. The bridge was shaken using T-Rex, a large-amplitude mobile shaker from the National Hazards Engineering Research Infrastructure (NHERI) facilities. Two finite-element models were created to assess the DSSI effects on the dynamic response of the bridge. One model included elements that incorporate the DSSI effects, while the other had fixed-base boundary conditions. The response from the DSSI FEM model matched the field results better than that from the fixed-base model, in terms of the peak response amplitudes and identified natural frequencies and modes. In addition, the model incorporating the DSSI effects led to a reduction in stress levels in various bridge components, compared with that of the fixed-base model. The results of this study are applicable to bridges with similar features and site conditions.
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