Nonlinear Seismic Response Analysis of Bridge Piers in Deep Water During Bidirectional Earthquakes


Abstract eng:
Deep-water piers will be subjected to the hydrodynamic pressure induced by the interaction between bridge piers and surrounding water under earthquake excitations, which will affect the dynamic responses of the piers. In addition, actual earthquake excitations are usually multidirectional and normally the bidirectional horizontal excitations control the behavior of the piers. Hence, it is necessary to study the nonlinear seismic responses of bridge piers in deep water under bidirectional earthquake excitations. In this paper, a water-pier interaction model under bidirectional earthquake excitations considering the effects of hydrodynamic pressure, geometric nonlinearity, and material nonlinear, is proposed using the potential-based fluid element through finite element analysis software ADINA. In the analysis model, 3D solid elements and 3D potentialbased fluid elements are used to model the bridge pier and the water, respectively. The data fitted concrete material model is used for the nonlinear constitutive relationship of concrete. Taking a typical solid pier of a large span bridge as the research object, the nonlinear seismic responses of the bridge pier in different water depths under unidirectional and bidirectional excitations are simulated. The effect of hydrodynamic pressure on the nonlinear seismic responses of the bridge pier is evaluated by analyzing the time histories of the relative displacement and the bending moment at the top and bottom of the pier, respectively. Numerical results show that the effect of hydrodynamic pressure on the nonlinear seismic responses under bidirectional earthquake excitations is more significant than the effect under unidirectional earthquake excitations. The effect under bidirectional earthquake excitations increases with the increase of water depth. In addition, the effect on the direction with wider upstream face is larger than the effect on the other direction under bidirectional earthquake excitations.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
Rights:
Text je chráněný podle autorského zákona č. 121/2000 Sb.



Record appears in:



 Record created 2017-01-18, last modified 2017-01-18


Original version of the author's contribution as presented on USB, paper 4517.:
Download fulltext
PDF

Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)