scholarly journals A critical examination of seismic response uncertainty analysis in earthquake engineering

2013 ◽  
Vol 42 (11) ◽  
pp. 1717-1729 ◽  
Author(s):  
Brendon A. Bradley
Keyword(s):  
Uncertainty Analysis ◽  
Seismic Response ◽  
Earthquake Engineering ◽  
Critical Examination ◽  
Response Uncertainty

Probabilistic seismic response and uncertainty analysis of continuous bridges under near-fault ground motions

2019 ◽  
Vol 13 (6) ◽  
pp. 1510-1519 ◽  
Author(s):  
Hai-Bin Ma ◽  
Wei-Dong Zhuo ◽  
Davide Lavorato ◽  
Camillo Nuti ◽  
Gabriele Fiorentino ◽  
...  
Keyword(s):  
Uncertainty Analysis ◽  
Seismic Response ◽  
Ground Motions ◽  
Near Fault

Seismic Response Analysis for Pier in Considering of Uplift Effect

2011 ◽  
Vol 243-249 ◽  
pp. 4052-4055
Author(s):  
Li Dong Zhao ◽  
Bo Song
Keyword(s):  
Seismic Response ◽  
Earthquake Engineering ◽  
Seismic Isolation ◽  
Ground Motions ◽  
Bending Moment ◽  
Element Model ◽  
Simulation Software ◽  
Response Analysis ◽  
Strong Ground ◽  
Maximum Horizontal Acceleration

In earthquake engineering, researchers have found that many structures were not damaged after strong ground motions because of the rocking effect. In order to reveal the potential application value of the uplift effect on seismic isolation, it will be using numerical simulation software OpenSees to research the seismic response of pier considering uplift. Building the pier’s finite element model and considering the plasticity and nonlinear of the pier and soil spring, the ground motion from El Centro and TCU101 are taken as the input respectively. Through analyzing the result, it is shown that at the base of the pier the maximum bending moment is reduced by 36.93% and 46.70%, and the maximum curvature is also reduced by 78.42% and 87.12% respectively. Meanwhile, the maximum horizontal acceleration at the top of the pier is decreased 12.60% and 16.90%. The uplift effect significantly reduces the plastic deformation and plays a base-isolated role according to the results. It has also found that the earthquakes with velocity pulse effect are dangerous to the structures.

scholarly journals Seismic analysis of high-speed railway irregular bridge–track system considering V-shaped canyon effect

2021 ◽  
Author(s):  
Zhihui Zhu ◽  
Yongjiu Tang ◽  
Zhenning Ba ◽  
Kun Wang ◽  
Wei Gong
Keyword(s):  
Seismic Response ◽  
Earthquake Engineering ◽  
High Speed ◽  
Seismic Analysis ◽  
Ground Motions ◽  
Back Side ◽  
Railway Bridge ◽  
High Speed Railway ◽  
Track System ◽  
Canyon Topography

AbstractTo explore the effect of canyon topography on the seismic response of railway irregular bridge–track system that crosses a V-shaped canyon, seismic ground motions of the horizontal site and V-shaped canyon site were simulated through theoretical analysis with 12 earthquake records selected from the Pacific Earthquake Engineering Research Center (PEER) Strong Ground Motion Database matching the site condition of the bridge. Nonlinear seismic response analyses of an existing 11-span irregular simply supported railway bridge–track system were performed under the simulated spatially varying ground motions. The effects of the V-shaped canyon topography on the peak ground acceleration at bridge foundations and seismic responses of the bridge–track system were analyzed. Comparisons between the results of horizontal and V-shaped canyon sites show that the top relative displacement between adjacent piers at the junction of the incident side and the back side of the V-shaped site is almost two times that of the horizontal site, which also determines the seismic response of the fastener. The maximum displacement of the fastener occurs in the V-shaped canyon site and is 1.4 times larger than that in the horizontal site. Neglecting the effect of V-shaped canyon leads to the inappropriate assessment of the maximum seismic response of the irregular high-speed railway bridge–track system. Moreover, engineers should focus on the girder end to the left or right of the two fasteners within the distance of track seismic damage.

Exact Solution of the Base-Isolated Structure With Sliding Type Base Isolator

2004 ◽  
Author(s):  
C. S. Tsai ◽  
Tsu-Cheng Chiang ◽  
Bo-Jen Chen
Keyword(s):  
Exact Solution ◽  
Seismic Response ◽  
Earthquake Engineering ◽  
Degrees Of Freedom ◽  
Good Accuracy ◽  
Base Isolation ◽  
Time History ◽  
Relative Deformation ◽  
History Analysis ◽  
Base Isolator

The use of base isolation for enhancing the seismic resistibility has been proved as an efficiency way from experimental efforts and theoretical studies. It is usual to insert a flexible device in horizontal direction to permit the most relative deformation at this level. Because of the rigidity of the superstructure is much higher than that of the base isolator underneath the structure, therefore, the behavior of the superstructure can be idealized as a rigid body during earthquakes. In general, hundreds of degrees of freedom and a step-by-step time history analysis are the basic requisitions for calculating the seismic response of a base isolated structure under earthquakes. In order to develop a simple tool which can be easily adopted for calculating the sliding displacement and the shear force of the base isolator, an exact solution for predicting the seismic responses of base isolated structures has been derived in this study. The comparison between the experimental results conducted at National Center for Research on Earthquake Engineering (NCREE) in Taiwan and the analytical results obtained from the exact solution show that the exact formulation derived in this study can predict the seismic response of the base isolated structure with very good accuracy.

Bedrock Depth Effect Investigation in Seismic Response of Offshore Platforms Considering Soil-Pile-Structure Interaction

2007 ◽  
Author(s):  
B. Asgarian ◽  
M. A. Roshandel Tavana ◽  
R. H. Soltani
Keyword(s):  
Dynamic Analysis ◽  
Seismic Response ◽  
Ground Motion ◽  
Earthquake Engineering ◽  
Nonlinear Dynamic ◽  
Nonlinear Dynamic Analysis ◽  
Offshore Platform ◽  
Offshore Platforms ◽  
Structure Interaction ◽  
Strong Ground

Offshore platforms in seismically active areas should be designed to survive severe earthquake excitations with no global structural failure. In seismic design of offshore platforms, it is often necessary to perform a dynamic analysis that accounts for nonlinear soil-pile-structures interaction effects. Nonlinear dynamic analysis for offshore structures has been a major challenge in marine structural and earthquake engineering. In this paper, nonlinear dynamic analysis of jacket type offshore platforms considering soil-pile-structure interaction subjected to strong ground motion have been studied. A jacket type offshore platform is included of piles, jacket and topside with different behaviors in seismic loading. Both jacket and pile elements have been modeled using fiber cross-sections. In this paper, free field ground motion analysis with respect to bedrock excitations has been done using nonlinear stress-strain relations for soil. This model has been developed using Open System for Earthquake Engineering Simulation (OpenSEES) software. In this paper, nonlinear seismic response analysis of an existing sample offshore platform in Persian Gulf subjected to strong ground motions in different bedrock depths has been performed and the results in terms of lateral deflections of platform, soil layers displacement-time history and acceleration response spectra of pile head, top of jacket and deck have been presented.

Comparison between standards for seismic design of liquid storage tanks with respect to soil-foundation-structure interaction and uplift

2012 ◽  
Vol 45 (1) ◽  
pp. 40-46 ◽  
Author(s):  
Miguel Ormeño ◽  
Tam Larkin ◽  
Nawawi Chouw
Keyword(s):  
Seismic Response ◽  
Seismic Design ◽  
Earthquake Engineering ◽  
Storage Tanks ◽  
Base Shear ◽  
Structure Interaction ◽  
Liquid Storage ◽  
Field Evidence ◽  
Soil Foundation ◽  
Foundation Structure

Field evidence has established that strong earthquakes can cause severe damage or even collapse of liquid storage tanks. Many tanks worldwide are built near the coast on soft soils of marginal quality. Because of the difference in stiffness between the tank (rigid), foundation (rigid) and the soil (flexible), soil-foundation-structure interaction (SFSI) has an important effect on the seismic response, often causing an elongation of the period of the impulsive mode. This elongation is likely to produce a significant change in the seismic response of the tank and will affect the loading on the structure. An issue not well understood, in the case of unanchored tanks, is uplift of the tank base that usually occurs under anything more than moderate dynamic loading. This paper presents a comparison of the loads obtained using “Appendix E of API STANDARD 650” of the American Petroleum Institute and the “Seismic Design of Storage Tanks” produced by the New Zealand Society for Earthquake Engineering. The seismic response assessed using both codes is presented for a range of tanks incorporating a range of the most relevant parameters in design. The results obtained from the analyses showed that both standards provide similar base shear and overturning moment; however, the results given for the anchorage requirement and uplift are different.

scholarly journals Instantaneous Identification of Bouc-Wen-Type Hysteretic Systems from Seismic Response Data

2007 ◽  
Vol 347 ◽  
pp. 331-338 ◽  
Author(s):  
Rosario Ceravolo ◽  
Giacomo V. Demarie ◽  
Silvano Erlicher
Keyword(s):  
Seismic Response ◽  
Earthquake Engineering ◽  
Wide Class ◽  
Ad Hoc ◽  
Time Varying ◽  
Restoring Force ◽  
Numerical Application ◽  
Response Data ◽  
Hysteretic Systems ◽  
Stationary Loading

This paper presents a technique for identification of non-linear hysteretic systems subjected to non-stationary loading. In the numerical simulations, a Bouc-Wen model was chosen for its ability to represent the properties of a wide class of real hysteretic systems. The parameters of the model are computed instantaneously by approximating the internal restoring force surface through an “ad hoc” polynomial basis. Instantaneous estimates result from time-varying spectra of the response signals. A numerical application of interest to earthquake engineering is finally reported.

Sign in / Sign up

Export Citation Format

Share Document