Predicting the Dynamic Response of Friction Dissipative Foundations Using a Modified Newmark Model

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• 作者：Davide Noè ; Gorini ; ^{davideno.gorini@uniroma1.it" class="auth_mail" title="E-mail the corresponding author} ; Luigi Callisto
• 关键词：dissipative foundations ; modified Newmark method ; parametric analysis
• 刊名：Procedia Engineering
• 出版年：2016
• 出版时间：2016
• 年：2016
• 卷：158
• 期：Complete
• 页码：170-175
• 全文大小：456 K

文摘

This paper analyses the dynamic behaviour of a seismic isolation technology adopted for the foundations of the towers of two recent long-span bridges, consisting of a dissipative layer of granular soil placed at the contact of the foundation caisson with a group of foundation piles. The fundamental aspects of this isolation device is studied through a three-dimensional modified Newmark model that accounts for the multi-directionality of the seismic motion and includes a simplified description of the dynamic response of the superstructure. This simplified model is expressed in a rigorous non-dimensional formulation and is validated against the results of three-dimensional dynamic analysis of the soil-structure interaction for a specific case of a suspension bridge. Taking advantage of the non-dimensional formulation of the simplified dynamic model, a parametric study of general validity is carried out, that highlights the most significant factors influencing the performance of the dissipative device.