Earthquake Response Analysis of Bridge Piers in Deep Water under Hydrodynamic Pressure Action

2012 ◽  
Vol 256-259 ◽  
pp. 1480-1483
Author(s):  
Xin Huang ◽  
Zhao Wei Huang ◽  
Xue Ying Hu ◽  
Hao Liang Cai ◽  
Lin Qi ◽  
...  
Keyword(s):  
Deep Water ◽  
Interaction Analysis ◽  
Hydrodynamic Pressure ◽  
Wave Theory ◽  
Dynamic Interaction ◽  
Bridge Pier ◽  
Dynamic Responses ◽  
Bridge Piers ◽  
Response Analysis ◽  
Earthquake Excitation

In order to ensure safety of long and huge bridges in deep water under earthquake action, it is significance to consider water and bridge pier dynamic interaction. Analysis method of water-bridge pier dynamic interaction under earthquake excitation is established using radiation wave theory, and earthquake induced hydrodynamic pressure apply program is complied. Considering different earthquake wave input, earthquake induced hydrodynamic pressure influence on dynamic responses of bridge pier in deep water is further studied. The results indicate that: Dynamic response of bridge pier in deep water is augmented because of hydrodynamic pressure action. Earthquake induced hydrodynamic pressure influence on seismic responses of bridge piers in deep water will change with different input earthquake wave.

Seismic Response Analysis of Deep Water Bridges with Pile Group Foundations

2014 ◽  
Vol 580-583 ◽  
pp. 1494-1498
Author(s):  
Dong Xiao Zhao ◽  
Jun Jie Wang ◽  
Jun Sheng Su
Keyword(s):  
Deep Water ◽  
Seismic Waves ◽  
Hydrodynamic Pressure ◽  
Mass Term ◽  
Pile Group ◽  
Bridge Piers ◽  
Response Analysis ◽  
Continuous Beam Bridge ◽  
Volume Method ◽  
Beam Bridge

In this paper, we intended to replace the fluid-structure interaction of deep water bridge piers with acceleration-dependent forces during an earthquake. The hydrodynamic pressure on bridge pier groups under seismic excitation is studied using the finite volume method. Different seismic waves with various spectrum components are selected in order to cover frequently encountered cases. The calculated forces of these cylinders are fitted into the Morison equation, and by calculation, the drag force term is negligible, thus the effect of fluid is converted into one added mass term. The paper further calculated the dynamic response of a continuous beam bridge with pier groups in water to check the validity of our proposed method.

Dynamic Response Analysis of Bridge Pier Subject to Earthquake and Ice Loads

2011 ◽  
Vol 250-253 ◽  
pp. 2211-2215
Author(s):  
Fu Qiang Qi
Keyword(s):  
Dynamic Response ◽  
Dynamic Equilibrium ◽  
Work Conditions ◽  
Bridge Pier ◽  
Dynamic Responses ◽  
Response Analysis ◽  
Analysis Method ◽  
Equilibrium Equations ◽  
Different Types ◽  
Ice Loads

In order to discuss the effect of earthquake and dynamic ice loads to a bridge pier, this paper considered the effect of added mass of dynamic water, and it deduced the dynamic equilibrium equations for a bridge pier subject to earthquake and dynamic ice loads on the basis of nonlinear Morision equation. Using numerical analysis method, it discussed the dynamic response of a bridge pier subject to different types of earthquake loads, forced ice loads, and both earthquake and forced ice loads. Through comparing the pier responses in different work conditions, it discovered that the dynamic responses of the bridge pier subject to forced dynamic ice loads rise and fall severely at the time of ice buckling broken periodic change. The coupling effects of forced dynamic ice loads and earthquake especially near-fault earthquake enhance the dynamic response of bridge pier significantly.

scholarly journals Influences on the Seismic Response of a Gravity Dam with Different Foundation and Reservoir Modeling Assumptions

Water ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3072
Author(s):  
Chen Wang ◽  
Hanyun Zhang ◽  
Yunjuan Zhang ◽  
Lina Guo ◽  
Yingjie Wang ◽  
...  
Keyword(s):  
Water Pressure ◽  
Hydrodynamic Pressure ◽  
Seismic Intensity ◽  
Dynamic Interaction ◽  
Dynamic Responses ◽  
Reservoir Modeling ◽  
Artificial Boundary ◽  
Reservoir Water ◽  
Dam Foundation ◽  
Water Simulation

The seismic design and dynamic analysis of high concrete gravity dams is a challenge due to the dams’ high levels of designed seismic intensity, dam height, and water pressure. In this study, the rigid, massless, and viscoelastic artificial boundary foundation models were established to consider the effect of dam–foundation dynamic interaction on the dynamic responses of the dam. Three reservoir water simulation methods, namely, the Westergaard added mass method, and incompressible and compressible potential fluid methods, were used to account for the effect of hydrodynamic pressure on the dynamic characteristics and seismic responses of the dam. The ranges of the truncation boundary of the foundation and reservoir in numerical analysis were further investigated. The research results showed that the viscoelastic artificial boundary foundation was more efficient than the massless foundation in the simulation of the radiation damping effect of the far-field foundation. It was found that a foundation size of 3 times the dam height was the most reasonable range of the truncation boundary of the foundation. The dynamic interaction of the reservoir foundation had a significant influence on the dam stress.

Dynamic Response Analysis on Flexible Riser With Different Configurations in Deep-Water Based on FEM Simulation

2018 ◽  
Author(s):  
Shuangxi Guo ◽  
Yilun Li ◽  
Min Li ◽  
Weimin Chen ◽  
Yue Kong
Keyword(s):  
Dynamic Response ◽  
Numerical Simulations ◽  
Deep Water ◽  
Dynamic Responses ◽  
Body Motion ◽  
Response Analysis ◽  
Flexible Beam ◽  
Nonlinear Dynamic Model ◽  
Nonlinear Fem ◽  
Structural Length

For case of oil/gas exploitation and mining in deep water, the length of riser is pretty large and, consequently, it brings huge challenges in both offshore installation and production operations and results in significant cost elevation due to the factors such as extreme tension loads induced from riser suspended self-weight and large structural flexibility. Therefore, there are several alternative riser configurations, e.g. lazy wave, hybrid tower and lazy-wave riser beside free hanging catenary, which have been proposed. In this paper, the dynamic characteristics and responses of several risers with typical configurations are considered and compared with each other based on our numerical simulations. Firstly, the nonlinear dynamic model of the riser systems are developed based on our 3d dynamic riser equations along with the modified FEM simulations. Then the dynamic response is analyzed based on our 3d curved flexible beam approach where the structural curvature changes with its spatial position and time in terms of vector equations. Compared with the linear approach, the nonlinear FEM method is used so as to consider large displacement/deformation, configuration geometry and structural stiffness changing with body motion. Moreover, the hydrodynamic force is considered as being related to body motion too. Based on the FEM numerical simulations, the influences of the amplitude/frequency of the top vessel motion along with the buoyancy modules/tower distribution along structural length on riser’s dynamic responses, in terms of the temporal-spatial evolution of displacement, curvature/bending stress and dynamic tension, are studied for different riser’s configurations. Our results show that the dynamic responses, particularly the maximum top tension, of different riser systems significantly change. Among the examined riser configurations, the response of the riser with more buoyancy modules may have lower value, and buoyancy distribution along structural length can influence the top tension and curvature.

Dynamic Response Analysis of Jacket Wharf Structure under Wave

2012 ◽  
Vol 226-228 ◽  
pp. 1353-1358
Author(s):  
Yuan Zhang ◽  
Ting Guo Chen
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Response ◽  
Deep Water ◽  
Pile Foundation ◽  
Dynamic Responses ◽  
Response Analysis ◽  
Wave Load ◽  
Pull Out ◽  
Concrete Pile ◽  
Steel Piles

With the large ship transportation for bulk cargo marine development, construction of modern offshore deep water wharf is becoming more and more important. Based on the view of domestic offshore deep water wharf, the jacket structure was proposed as deep water light wharf. In consideration of the structure dynamic responses and the pile foundation pull-out resistance, three types of pile foundation were adopted, which are the hollow steel piles, the reinforced concrete pile and the hollow steel piles poured with granular materials. By finite element method the vibration characteristic and transient dynamic response to wave load were calculated. The results show that the jacket structure’s dynamic response to wave is not obvious. Also the structure with reinforced concrete pile can reduce the structure vibration displacement.

scholarly journals Seismic Design Method of Self-Centring-Segment Bridge Piers with Tensile-Type Viscoelastic Dampers

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Huixing Gao ◽  
Yang Song ◽  
Wenting Yuan ◽  
Hongxu Lu ◽  
Shuo Cao
Keyword(s):  
Seismic Design ◽  
Design Method ◽  
Element Model ◽  
Bridge Pier ◽  
Bridge Piers ◽  
Earthquake Excitation ◽  
Viscoelastic Dampers ◽  
Displacement Based ◽  
Seismic Design Method ◽  
Stiffness And Damping

This paper aims to study the deformational behaviour of tensile-type viscoelastic dampers under different earthquake excitation directions. A method for calculating the corresponding equivalent additional stiffness and damping of a self-centring-segment bridge pier is derived. Using the displacement-based seismic design method, a design method for self-centring-segment bridge piers with tensile-type viscoelastic dampers is proposed. Using the proposed method, a self-centring-segment bridge pier is designed. Based on dynamic analysis of the finite element model by OpenSees, the effectiveness of the proposed seismic design method is validated.

Dynamic Response Analysis of MSCSS Constructed with Rubber Vibration Isolator

2014 ◽  
Vol 574 ◽  
pp. 179-183
Author(s):  
Tao Li
Keyword(s):  
Base Isolation ◽  
Dynamic Responses ◽  
Response Analysis ◽  
Vibration Isolator ◽  
Seismic Responses ◽  
Earthquake Excitation ◽  
Isolation Technique ◽  
Probability Density Evolution Method ◽  
And Control ◽  
Probability Density Evolution

The seismic responses of the mega-sub controlled structural system (MSCSS) can be reduced effectively based on the combination of the construction and control theory. One of the main construction features of the MSCSS is the connection between the additional column and the mega beam. The rubber vibration isolator is proposed as a new connection mode between the above two components according to the base isolation technique. The dynamic responses of the MSCSS subjected to the earthquake excitation are investigated by employing the probability density evolution method. The analysis results are compared with the seismic responses of the MSCSS constructed with other connection modes. The results show that the seismic responses of the MSCSS constructed with rubber vibration isolator can be reduced effectively, but the effect is not better than the other connection modes.

Estimation of bridge static response and vehicle weights by frequency response analysis

1998 ◽  
Vol 25 (4) ◽  
pp. 631-639 ◽  
Author(s):  
G Thater ◽  
P Chang ◽  
D R Schelling ◽  
C C Fu
Keyword(s):  
Dynamic Effect ◽  
Dynamic Responses ◽  
Response Analysis ◽  
Static Response ◽  
Actual Weight ◽  
Service Testing ◽  
Weigh In Motion ◽  
Moving Vehicles ◽  
Bridge Structures ◽  
Truck Weight

A methodology is developed to more accurately estimate the static response of bridges due to moving vehicles. The method can also be used to predict dynamic responses induced by moving vehicles using weigh-in-motion (WIM) techniques. Historically, WIM is a well-developed technology used in highway research, since it has the advantage of allowing for the stealthy automatic collection of weight data for heavy trucks. However, the lack of accuracy in determining the dynamic effect in bridges has limited the potential for its use in estimating the fatigue life of bridge structures and their components. The method developed herein amends the current WIM procedures by filtering the dynamic responses accurately using the Fast Fourier Transform (FFT). Example applications of the proposed method are shown by using computer-generated data. The method is fast and improves the predicted truck weight up to 5% of the actual weight, as compared to errors up to 10% using the current WIM methods.Key words: weigh-in-motion, digital filters, FFT, bridge dynamics, in-service testing.

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