scholarly journals Analysis on Dynamic Characteristics and Seismic Response of Wooden Structure of South Gate Building in Jiangzhang Town

2022 ◽  
Vol 2148 (1) ◽  
pp. 012046
Author(s):  
Xiancai Ren ◽  
Zhaobo Meng ◽  
Xin Wang ◽  
Feifei Gao ◽  
Ting Zhang
Keyword(s):  
Seismic Response ◽  
Element Model ◽  
Shanxi Province ◽  
Response Analysis ◽  
Acceleration Response ◽  
The South ◽  
Response Curves ◽  
Tower Model ◽  
Wooden Structures ◽  
The Finite Element Model

Abstract In order to study the seismic performance of ancient wooden structures with single eaves and beam lifting in China, the finite element model of the upper floor of the south gate of Jiangzhang town in Shanxi Province was established by using ANSYS. Through modal analysis, the main frequencies and modes of the south gate of Jiangduan were obtained. Through the seismic response analysis of the south gate tower model, the displacement and acceleration response curves of the top nodes of the outer eaves column, golden column and through column under various working conditions of the South gate tower are obtained. The results show that the first and second order frequencies of the South Gate tower model are 1.830Hz and 1.855Hz, and the first two order modes are mainly transitional. With the increase of seismic excitation, the displacement and acceleration response of the top joints of the outer eave column, golden column and through column increase.

Damping Value for Seismic Response Analysis of Long-Span Bridges

2011 ◽  
Vol 90-93 ◽  
pp. 1522-1525
Author(s):  
Ling Ling Yu
Keyword(s):  
Seismic Response ◽  
Dynamic Properties ◽  
Element Model ◽  
Response Analysis ◽  
Seismic Response Analysis ◽  
Long Span Bridges ◽  
Rayleigh Damping ◽  
Long Span ◽  
Damping Theory ◽  
The Finite Element Model

The current problems on damping in seismic response analysis of bridges is presented. The Rayleigh damping theory is simply introduced in this paper. Taking the Longtan River Bridge for instance, the finite element model of Longtan River Bridge (left line) is established. Then, the dynamic properties of the bridge is analyzed. Based on this, the Rayleigh damping constants and in an ANSYS dynamic analysis are obtained.

scholarly journals Probabilistic seismic response analysis of coastal highway bridges under scour and liquefaction conditions: does the hydrodynamic effect matter?

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Xiaowei Wang ◽  
Yutao Pang ◽  
Aijun Ye
Keyword(s):  
Seismic Response ◽  
Seismic Design ◽  
Highway Bridges ◽  
Element Model ◽  
Response Analysis ◽  
Hydrodynamic Effect ◽  
Strong Earthquakes ◽  
Influence Of Water ◽  
Scour Hazard ◽  
Ground Motion Records

AbstractCoastal highway bridges are usually supported by pile foundations that are submerged in water and embedded into saturated soils. Such sites have been reported susceptible to scour hazard and probably liquefied under strong earthquakes. Existing studies on seismic response analyses of such bridges often ignore the influence of water-induced hydrodynamic effect. This study assesses quantitative impacts of the hydrodynamic effect on seismic responses of coastal highway bridges under scour and liquefaction potential in a probabilistic manner. A coupled soil-bridge finite element model that represents typical coastal highway bridges is excited by two sets of ground motion records that represent two seismic design levels (i.e., low versus high in terms of 10%-50 years versus 2%-50 years). Modeled by the added mass method, the hydrodynamic effect on responses of bridge key components including the bearing deformation, column curvature, and pile curvature is systematically quantified for scenarios with and without liquefaction across different scour depths. It is found that the influence of hydrodynamic effect becomes more noticeable with the increase of scour depths. Nevertheless, it has minor influence on the bearing deformation and column curvature (i.e., percentage changes of the responses are within 5%), regardless of the liquefiable or nonliquefiable scenario under the low or high seismic design level. As for the pile curvature, the hydrodynamic effect under the low seismic design level may remarkably increase the response by as large as 15%–20%, whereas under the high seismic design level, it has ignorable influence on the pile curvature.

The Wind Load Analysis of a Cable Net Structure

2013 ◽  
Vol 811 ◽  
pp. 228-233
Author(s):  
Yang Yang ◽  
Yuan Ying Qiu ◽  
Gai Juan Wang
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Wind Load ◽  
Nonlinear Finite Element ◽  
Response Analysis ◽  
Nonlinear Finite Element Method ◽  
Form Finding ◽  
Load Analysis ◽  
The Given ◽  
The Finite Element Model

The response analysis of a large cable net bearing wind load is conducted by the nonlinear finite element method. First, the form-finding calculation of the cable net structure is carried out to find an equilibrium state which can make the pretensions and sags of the wires meet the given requirements. Then the static analyses of the finite element model of the cable net structure under different wind loads are conducted to assess whether the cable net structure meets the requirements for strength. The work of this paper establishes the foundation for the design of a large cable antenna.

Thermal Response Analysis and FE Modeling of Weapon

2012 ◽  
Vol 503-504 ◽  
pp. 11-14
Author(s):  
Yan Jun Zhao ◽  
Xin Jun Li ◽  
Yong Hai Wu ◽  
Cheng Xu
Keyword(s):  
Thermal Analysis ◽  
Finite Element ◽  
Temperature Field ◽  
Research Work ◽  
Thermal Response ◽  
Element Model ◽  
Response Analysis ◽  
Fe Modeling ◽  
Effects Of Temperature ◽  
The Finite Element Model

Thermal is a important factor that affect weapon firing accuracy and security in the process of weapon fire, so thermal analysis of weapon has important meaning . Aim at researched Weapon, the finite element model of the gun body was built, the temperature field of the gun body was calculated by FEM. The effects of temperature of the gun body on firer and aiming mechanism were also studied. Current research work will be helpful the weapon design

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.

Study on Effect of Seismic Joint to Seismic Response of Tunnel Passing through Fault

2013 ◽  
Vol 482 ◽  
pp. 252-255 ◽  
Author(s):  
Feng Gao ◽  
Xiao Gang Shu ◽  
Dian Li Xue ◽  
Jiao Liu
Keyword(s):  
Seismic Response ◽  
Underground Structure ◽  
Element Model ◽  
Separation Distance ◽  
Practical Significance ◽  
Seismic Resistance ◽  
Response Analysis ◽  
Analysis Model ◽  
Fault Fracture Zone ◽  
Tunnel Depth

As underground structure, the tunnel itself has good anti-seismic performance, but in recent years, according to a large number of investigation data about the earthquake disaster for tunnel, we find that the tunnel passing through the fault fracture zone is quite easy to be destroyed seriously. Therefore, developing dynamic response analysis and shock absorption measures has great practical significance. According to the characteristics of tunnel passing through fault and the tunnel depth, considering a certain proportion relationship in finite element model, the analysis model for tunnel seismic joint is established. Finally comparing the results comprehensively, we discuss the effect of the different setting location and setting separation distance of seismic joint to seismic response of tunnel passing through fault. From the work we have done, we get the seismic joint which is good for tunnel seismic resistance. This method is expected to be adopted as reference to the similar projects.

The Use of Wave-Absorbing Elements for the Evaluation of Transmission Characteristics of Beam Junctions

1997 ◽  
Vol 119 (3) ◽  
pp. 293-303 ◽  
Author(s):  
K. De Langhe ◽  
P. Sas ◽  
D. Vandepitte
Keyword(s):  
Finite Elements ◽  
Dynamic Range ◽  
General Procedure ◽  
Travelling Waves ◽  
Element Model ◽  
Response Analysis ◽  
Transmission Characteristics ◽  
The Finite Element Model ◽  
Transmission And Reflection ◽  
Absorbing Elements

The following paper addresses the applicability and the advantages of finite elements for the study of transmission and reflection of waves impinging upon beam junctions. It will be shown that it is possible to simulate travelling waves on general beams by using a wave-absorbing element at each end of the beam. The stiffness matrix of the wave-absorbing element is determined by the characteristic stiffness of the beam. A general procedure to identify the characteristic stiffness is given in the appendix. Next, by performing a direct frequency response analysis on the finite element model of the junction (including the wave-absorbing elements at either end), it is possible to calculate the energy absorbed by the wave-absorbing elements. Along with some additional calculations, one can easily deduce the energy transmission characteristics of the junction. The method will be explained in detail in the case of beam junction. The applicability, which is mainly situated in the higher frequency dynamic range, will be highlighted through some relevant examples. One of the main advantages of using finite elements is the possibility of evaluating the transmission characteristics of whatever junction, including all essential geometrical details, in a straightforward way.

Dynamic Response Analysis of the Hydraulic Pipe under Jets of the Aircraft Tire Burst

2013 ◽  
Vol 798-799 ◽  
pp. 341-344
Author(s):  
Run Lian Jiang ◽  
Yao Hua Wang ◽  
Cheng Fei Fan ◽  
Mian Jun Duan
Keyword(s):  
Static Pressure ◽  
Peak Pressure ◽  
Element Model ◽  
Response Analysis ◽  
Stress And Strain ◽  
Static Loads ◽  
Pressure Surface ◽  
The Impact ◽  
Debris Jets ◽  
The Finite Element Model

The finite element model of an aircraft hydraulic pipe was established in this paper. Based on LS-Dyna software equivalent static pressure and peak pressure surface loads on the tire burst test (main landing gear retracted state, and did not consider the impact of tire debris) jets were applied to the hydraulic pipe. Both stress and strain contours of hydraulic pipe were obtained under dynamic loading. Plastic strain occurred under both loads on the hydraulic pipe, and the peak pulse loads were more severe than equivalent static loads, the maximum strain reached 0.41172 under the peak pulse loads. However, in both cases the pipe is not broken.

Falling Simulation of Free-Standing Museum Cultural Relics Supported by Soft Pad

2014 ◽  
Vol 670-671 ◽  
pp. 715-719
Author(s):  
Qian Zhou
Keyword(s):  
Material Properties ◽  
Element Model ◽  
Von Mises Stress ◽  
Stress Distributions ◽  
Acceleration Response ◽  
Response Curves ◽  
Free Standing ◽  
Cultural Relic ◽  
Von Mises ◽  
Cultural Relics

Free-standing museum cultural relics are easy to fall off exhibition booth and get damaged under earthquakes. To find an effective method to mitigate damage of cultural relics due to fall off, influences of soft pad under relic was studied by ANSYS/LS-DYNA program. A bronze relic supported by a soft pad was selected for analysis. Based on material properties of both the relic and the pad, finite element model of the relic was built. By simulation, Von mises stress distributions, acceleration response curves as well as kinetic energy curves of the relic were obtained; effects of the soft pad to mitigate damage of the relic were discussed. Results show that collision between the falling museum cultural relic and ground can be mitigated by soft pad due to its buffer as well as energy absorption effects. It is suggested to use soft pad under relic to provide protection. Besides, by ANSYS/LS-DYNA program, falling off process of free-standing museum cultural relics can be effectively simulated.

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