Abstract
The objective of this paper is to expediently expose the seismic performance pertinent to demand and capacity of general long-span suspension bridges crossing active faults. Firstly three dimensional finite element model of the ordinary long-span suspension bridge is established based on the powerful and attractive finite element software ANSYS. Secondly a series of appropriate fault ground motions with different target final permanent displacements (Tectonic displacements or ground offset) in the direction perpendicular to the fault plane are assumed and applied to the employed long-span suspension bridge. And then the Newmark method is utilized to solve the equation of motion of the long-span suspension bridge structure subjected to fault ground motions in the elastic range. Finally some important conclusions are drawn that the final permanent displacements in the direction perpendicular to the fault plane has significant influence on the seismic responses and demands of general long-span suspension bridges crossing active faults. And the resultant conclusions deliver explicitly and directly specifications and guidelines for seismic design of ordinary long-span suspension bridges across fault-rupture zones.
Highlights
Highways and railways in China have been extended fully and rapidly to remote areas due to the promotion of transportation power strategy (Jia et al 2013)
As known the internal force and displacement responses of bridges crossing fault-rupture zones are governed by the vibration of ground surface on both sides of the fault plane and by the fault-rupture displacement (Yang et al 2020; Lin et al 2020a, b) The fault-rupture permanent displacement varying from tens of centimeters to several meters is significantly difference between ground motions at two sides of fault plane and others (Goel et al 2014; Goel and Chopra 2009; Goel and Chopra 2008)
Some issues and challenges should be handled in the aspect of bridge seismic design such as how to choose a suitable bridge type to span active faults with permanent ground rupture displacements ranging from tens of centimeters to several meters? and how to improve the capacity of existing bridge types to span large ground surface rupture placements? Commonly bridge design engineers adopt the short span supported beam bridge to span active fault for minimizing the cost of bridge collapse once the fault rupture displacement induced by earthquakes (Hui et al 2018; Hui et al 2015)
Summary
Highways and railways in China have been extended fully and rapidly to remote areas due to the promotion of transportation power strategy (Jia et al 2013). Bridge design engineers adopt the short span supported beam bridge to span active fault for minimizing the cost of bridge collapse once the fault rupture displacement induced by earthquakes (Hui et al 2018; Hui et al 2015). The ground vibration and ground surface rupture offset controlling respectively relative dynamic term and quasi static term in the equation of motion of structures are responsible for seismic performance of cable-supported bridge structures crossing active fault. Besides so-called preliminary numerical study of ordinary longspan suspension bridge crossing fault considers only longitudinal seismic excitations for capability estimation of adapting to horizontal permanent ground rupture displacement and the vertical ground motions and the pile-soil interaction will be ignored in this paper. The Eq (3) is the dynamic equation of displacement-based input mode
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