SEISMIC RESPONSE OF SLIDING STRUCTURES TO BIDIRECTIONAL EARTHQUAKE EXCITATION

1996 ◽  
Vol 25 (11) ◽  
pp. 1301-1306 ◽  
Author(s):  
R. S. JANGID
Keyword(s):  
Seismic Response ◽  
Earthquake Excitation ◽  
Sliding Structures

scholarly journals Response of Base-Isolated Liquid Storage Tanks

2004 ◽  
Vol 11 (1) ◽  
pp. 33-45 ◽  
Author(s):  
M.B. Jadhav ◽  
R.S. Jangid
Keyword(s):  
Seismic Response ◽  
Seismic Isolation ◽  
Equations Of Motion ◽  
Approximate Model ◽  
Storage Tanks ◽  
Step Method ◽  
Earthquake Excitation ◽  
System Parameters ◽  
Liquid Storage ◽  
Isolation Systems

Seismic response of liquid storage tanks isolated by elastomeric bearings and sliding system is investigated under real earthquake ground motions. The continuous liquid mass of the tank is modeled as lumped masses known as sloshing mass, impulsive mass and rigid mass. The coupled differential equations of motion of the system are derived and solved in the incremental form using Newmark's step-by-step method with iterations. The seismic response of isolated tank is studied to investigate the comparative effectiveness of various isolation systems. A parametric study is also carried out to study the effect of important system parameters on the effectiveness of seismic isolation for liquid storage tanks. The various important parameters considered are: (i) aspect ratio of the tank and (ii) the time period of the isolation systems. It was observed that both elastomeric and sliding systems are found to be effective in reducing the earthquake forces of the liquid storage tanks. However, the elastomeric bearing with lead core is found to perform better in comparison to other systems. Further, an approximate model is proposed for evaluation of seismic response of base-isolated liquid storage tanks. A comparison of the seismic response evaluated by the proposed approximate method and an exact approach is made under different isolation systems and system parameters. It was observed that the proposed approximate analysis provides satisfactory response estimates of the base-isolated liquid storage tanks under earthquake excitation.

Seismic Response Analysis of LNG Storage Tank under the Vertical Earthquake Excitation

2013 ◽  
Vol 368-370 ◽  
pp. 1743-1746
Author(s):  
Li Jian Zhou ◽  
Yuan Gang Fan ◽  
Bin Gao ◽  
Xiang Ying Wang
Keyword(s):  
Finite Element ◽  
Seismic Response ◽  
Storage Tank ◽  
Axial Stress ◽  
Equivalent Stress ◽  
Response Analysis ◽  
Seismic Action ◽  
Seismic Response Analysis ◽  
Earthquake Excitation ◽  
Finite Element Software

Use Adina finite element software, established the finite element model of the the volume 10000m3LNG storage tank, against the concrete outer tank of full containment type LNG storage tank vertical seismic action seismic response analysis. Take acceleration seismic input method, select the four categories venue seismic waves, LNG storage tank stress analysis of vertical seismic action, come in different earthquake LNG storage tank outer tank equivalent stress, hoop stress and axial stress distribution.

scholarly journals Control of Difference of Seismic Response Across Different Spans of High-Speed Railway Multi-Spans Simply Supported Bridge

2021 ◽  
Author(s):  
Yuntai Zhang ◽  
Lizhong Jiang ◽  
Wangbao Zhou ◽  
Zhipeng Lai ◽  
Xiang Liu ◽  
...  
Keyword(s):  
Seismic Response ◽  
High Speed ◽  
Evaluation Method ◽  
Longitudinal Distribution ◽  
Track Structure ◽  
Earthquake Excitation ◽  
High Speed Railway ◽  
Simply Supported ◽  
Bridge Model ◽  
The Difference

Abstract In this paper, the Difference of Seismic Response across Different Spans (DSR) in the longitudinal distribution of High-Speed Railway Multi-spans Simply Supported Bridge (HSRSB) under longitudinal earthquake excitation is investigated, and an evaluation method which can intuitively reflect the difference of seismic response is proposed. A feasible way to strengthen the connection stiffness between adjacent girders is proposed to control DSR. The rationality of the finite element model used is verified by comparing the numerical results with the experimental ones, showing a satisfactory agreement. Comparing the seismic response of a bridge model considering the subgrade-track constraints (BCTM) and a bridge model without subgrade-track constraints (BWTM), it is found that the DSR in the longitudinal distribution causes some new disadvantages, which are neglected in BWTM. The BCTM considering DLC generates a model called BCDM. The effect of the number of span on DSR are studied based on BCDM. The analysis of this model showed that DLC suppresses the DSR and reduces the seismic response of most bridge components. It also transfers the seismic disadvantage from the bridge part to the subgrade-track structure. As it is more convenient and cost-effective to repair the base plate of the subgrade than the bridge components after earthquake seismic event, this disadvantage transfer is in favor of forming a new anti-seismic system that subgrade-track structure is used to protect the bridge part.

Error Study of Displacement Model for Seismic Analysis of Long-Span Structures Subjected to Multi-Support Earthquake Excitations

2010 ◽  
Vol 163-167 ◽  
pp. 4125-4128
Author(s):  
Wei Guo ◽  
Zhi Wu Yu ◽  
Zhen Guo
Keyword(s):  
Seismic Response ◽  
Influencing Factors ◽  
Seismic Analysis ◽  
Earthquake Excitation ◽  
The Public ◽  
Long Span ◽  
Numerical Studies ◽  
Structural Style ◽  
Acceleration Model ◽  
Displacement Model

Long-span structure is a more common structural style in the public buildings, and its seismic response often differs from other structures because of the long-span characteristic, and thereby the multi-support earthquake excitation, such as the displacement model and acceleration model, need to be adopted in the seismic analysis. However, relative researches have proved that there exists certain problem in the displacement model. According to previous works, the error causes of displacement model are described firstly and expression is also given to estimate the magnitude of error. Then, the influencing factors on the error of displacement model are also given and analyzed. In the end, numerical studies are carried out to verify the viewpoint proposed in this paper.

Effects of the Hinge Restrainers on the Response of the Aptos Creek Bridge during the 1989 Loma Prieta Earthquake

1997 ◽  
Vol 13 (2) ◽  
pp. 167-189 ◽  
Author(s):  
Saber M. Abdel-Ghaffar ◽  
E“Manos” Maragakis ◽  
M“Saiid” Saiidi
Keyword(s):  
Seismic Response ◽  
Structural Response ◽  
Bridge Site ◽  
Earthquake Excitation ◽  
Loma Prieta Earthquake ◽  
Shear Key ◽  
Nonlinear Seismic Response ◽  
The Absolute ◽  
Loma Prieta

This paper presents the results of a study for the effects of the cable restrainers on the nonlinear seismic response of the Aptos Creek Bridge during the 1989 Loma Prieta earthquake. The earthquake analyses focus on the relative displacements of the hinge, the absolute displacements of the bridge, the restrainer force levels, the shear key and the shear pipe forces, the hinge impact, and the abutment and pile forces in both the longitudinal and the transverse directions. At the estimated earthquake excitation levels at the bridge site, it was found that the restrainers did not play a major role on the overall structural response. However, at higher acceleration levels they contributed significantly to the reduction of displacement and force responses.

Seismic Response of Long Span Continuous Rigid-Framed Steel Arch Bridge

2018 ◽  
Vol 763 ◽  
pp. 1087-1094
Author(s):  
Ai Rong Liu ◽  
Yong Lin Pi
Keyword(s):  
Seismic Response ◽  
Shear Wave ◽  
Traveling Wave ◽  
Wave Speed ◽  
Wave Effect ◽  
Earthquake Excitation ◽  
Arch Bridge ◽  
Shear Wave Speed ◽  
Traveling Wave Effect ◽  
Long Span

This paper investigates seismic responses of Xinguang Bridge, a 3-span continuous rigid-frame and steel-truss arch bridge. Earthquake excitation input is a key issue for the seismic analysis. This paper uses a finite element method to study the traveling wave effect on Xinguang Bridge and its interaction with the dynamic properties of the bridge under the condition of two steps and two levels probability. The seismic response of the bridge under the coincident earthquake excitation is also analyzed. Comparisons show that the seismic response of the long-span bridge by considering the traveling wave effect is much different from that under consistent earthquake excitation. The influence of the shear wave speed on the seismic response of the long span continuous bridge is also explored and the shear wave speed is found to greatly affect the wave shape and magnitude of the time-history of the longitudinal displacement at the crown of the main arch of the bridge. It is concluded that traveling wave effect and shear wave speed of ground have significant influences on the seismic response of the long span continuous rigid-framed and steel-truss arch bridge.

Seismic Control Research of Longitudinal Floating Bridge Based on MR Damper

2011 ◽  
Vol 117-119 ◽  
pp. 201-205
Author(s):  
Meng Gang Yang ◽  
Kui Ouyang
Keyword(s):  
Time Delay ◽  
Vibration Control ◽  
Seismic Response ◽  
Mr Damper ◽  
Control Force ◽  
Longitudinal Displacement ◽  
Linear Quadratic ◽  
Earthquake Excitation ◽  
Seismic Control ◽  
Floating Bridge

In order to reduce the longitudinal displacement of longitudinal floating bridge subject to earthquake excitation, seismic response reduction control strategy for longitudinal floating bridge with MR damper is developed based on the MATLAB software for numerical simulation and the vibration control algorithm of classical linear quadratic of full-state feedback. In this paper, the seismic response reduction analysis for a longitudinal floating bridge, Pingsheng Bridge which is a self-anchored suspension bridge with a single tower, is completed, and also the optimal active control force is obtained. Furthermore, the effect of time delay on seismic control is investigated. The results show that the longitudinal displacement of longitudinal floating bridge can be effectively reduced by vibration control system with MR damper, and the time delay has little influence on seismic response reduction of longitudinal floating bridge.

scholarly journals Seismic Response Evaluation of RC Tower Connected to Short Rigid Buildings

2011 ◽  
Vol 462-463 ◽  
pp. 569-575 ◽  
Author(s):  
Farzad Hejazi ◽  
Mohammad S. Dalili ◽  
Jamal Noorzaei ◽  
M.S. Jaafar ◽  
A.Ali Abang Abdullah ◽  
...  
Keyword(s):  
Seismic Response ◽  
Tall Buildings ◽  
Damping Coefficient ◽  
Viscous Damper ◽  
Rc Buildings ◽  
Earthquake Excitation ◽  
Earthquake Effect ◽  
Recent Developments ◽  
Element Technique ◽  
Civil Engineers

In urban construction with the presence of tall buildings adjacent to short buildings, civil engineers have tried to connect low-rise rigid buildings to tall buildings in order to enhance the rigidity of the towers and decrease seismic response induced by earthquake excitation. From recent developments in earthquake energy dissipation systems, the application of viscous dampers for coupling of parallel and adjacent buildings to reduce earthquake effect has been considered by civil engineers, and many investigations have been conducted. In the present study an attempt has been made to evaluate the effect of connecting reinforced concrete towers to short rigid building through viscous damper devices. For this purpose, a 10-story RC tower connected to two short RC buildings by viscous damper was modeled and analyzed under Elcentro (1940) earthquake record excitation by using the finite element technique. In addition, the effect of various viscous damper damping coefficients on seismic response of the tower was evaluated by analyzing the aforementioned tower with various damper damping coefficient to the short building. The results showed improvement of seismic response of the tall building which was supported by short RC buildings through viscous damper device during earthquake. Moreover by increasing damper damping coefficient response of the tower structure the displacement was effectively reduced.

Seismic Response of Floating Roof Liquid Storage Tanks: Part II—Contact Pressure Approach

2010 ◽  
Author(s):  
Alexander L. Kozak ◽  
Philip J. Cacciatore ◽  
L. Magnus Gustafsson
Keyword(s):  
Seismic Response ◽  
Storage Tank ◽  
American Petroleum Institute ◽  
Material Behavior ◽  
Engineering Practice ◽  
Earthquake Excitation ◽  
Element Analysis ◽  
Liquid Storage ◽  
Liquid Storage Tank ◽  
Nonlinear Geometric

Seismic response of liquid storage tank floating roofs involve phenomena that require dynamic analysis of nonlinear geometric and material behavior as well as surface to surface contact. Good engineering practice requires a practical analytical approach that captures the essential ingredients of structural behavior under earthquake excitation by making reasonable, conservative, and manageable approximations to the actual conditions. This paper discusses an approach to approximating the stresses and deformations of a liquid storage tank floating roof under seismic loading. The method is validated by a fully coupled fluid-structure interaction (FSI) finite element analysis using actual earthquake ground accelerations. The method is supported by both the American Petroleum Institute (API) and the Petroleum Association of Japan (PAJ).

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