Dynamic Response Analysis of Steel Rope Impact on Asymmetric Twin Tower Building with Large Bases

2012 ◽  
Vol 166-169 ◽  
pp. 487-492
Author(s):  
Qiong Fen Wang ◽  
Ji Yao ◽  
Hui Min Wang ◽  
Chun Li Guo
Keyword(s):  
Shear Force ◽  
Bending Moment ◽  
Time Domain Analysis ◽  
Seismic Excitation ◽  
Response Analysis ◽  
Analysis Method ◽  
Structural Dynamic ◽  
Fem Model ◽  
Steel Rope ◽  
Structural Dynamic Characteristics

The FEM model of asymmetric twin tower building with large bases was established with FE-program ANSYS. The influences of steel rope on the structural dynamic characteristics were analyzed. The x-direction level seismic excitation were input with the help of time-domain analysis method, the influence of steel rope on the top’s acceleration ,the bottom shear force and bending moment of the structure were researched. Some useful results were obtained.

Response Analysis on Asymmetric Twin Tower Building with Large Bases Subjected to Seismic Action

2011 ◽  
Vol 117-119 ◽  
pp. 174-179
Author(s):  
Qiong Fen Wang ◽  
Ji Yao ◽  
Liang Cao ◽  
Jian Bin Xie ◽  
Chun Li Guo
Keyword(s):  
Time Domain ◽  
Structural Design ◽  
Time Domain Analysis ◽  
Response Analysis ◽  
Seismic Action ◽  
Analysis Method ◽  
Structural Dynamic ◽  
Fem Model ◽  
Structural Dynamic Characteristics ◽  
High Building

In this paper, asymmetric twin tower high buildings with large bases were studied and the FEM model of asymmetric twin tower high building with large bases was established. Then the structural dynamic characteristics was analyzed, the x-direction and y-direction level seismic excitation were input separately with the help of time-domain analysis method, and the acceleration time-domain curve of the top of the structure was obtained, the reference of structural design was provided.

Vibration behavior of an overhead conductor under updraft winds

2021 ◽  
pp. 107754632110058
Author(s):  
Qi Zhou ◽  
Liangtao Zhao ◽  
Chong Zheng ◽  
Feng Tu
Keyword(s):  
Induced Response ◽  
Response Analysis ◽  
Response Factor ◽  
Structural Dynamic ◽  
Resonance Response ◽  
Structural Dynamic Characteristics ◽  
Strong Winds ◽  
American Society ◽  
Gust Response Factor ◽  
Gust Response

At present, the wind-induced response analysis of an overhead conductor is mainly based on the action of horizontal normal wind. However, for crossing hillsides or extremely strong winds, such a conductor will bear the action of updraft wind, which will change the geometry of the conductor and make its structural dynamic characteristics nonlinear to some extent. In this work, the in-plane and out-of-plane two-dimensional nonlinear equations were established under the action of self-weight and updraft wind. Furthermore, the improved equations of conductor tension and sag were obtained, and the wind-induced vibration response was further investigated. The results showed that the updraft wind caused the nonlinearity of the tension and sag of the overhead conductor, and the nonlinear geometric change significantly affected its resonance response, which exceeded 25% if the wind speed was 50 m/s. In addition, because the proportion of the resonance response in the total wind-induced response was different, the influence of the wind attack angle calculated using the gust response factor method on the gust response factor was slightly larger than that calculated using the the American society of civil engineers method.

Numerical Simulations for Bending Moment Distribution on Linings of Tunnel Excavated by Shield

2015 ◽  
Vol 744-746 ◽  
pp. 1033-1036
Author(s):  
Zi Chang Shangguan ◽  
Shou Ju Li ◽  
Li Juan Cao ◽  
Hao Li
Keyword(s):  
Numerical Simulations ◽  
Axial Force ◽  
Shear Force ◽  
Bending Moment ◽  
Geological Data ◽  
Fem Model ◽  
Maximum Moment ◽  
Moment Distribution ◽  
Negative Moment ◽  
The Moment

In order to simulate moment distribution on linings of tunnel excavated by shield, FEM-based procedure is proposed. According to geological data of tunnel excavated by shield, FEM model is performed, and the moment, axial force and shear force distributions on linings are computed. The maximum moment on segments decreases while Poisson’s ratio of soil materials touching to segments increases. The moment value and distribution vary with Young’s modulus of soil materials. The maximum positive moment on linings is approximately equal to the maximum negative moment.

scholarly journals Field Observation and Theoretical Study on an Existing Tunnel Underpassed by New Twin Tunnels

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
Qiongfang Zhang
Keyword(s):  
Shear Force ◽  
Theoretical Study ◽  
Bending Moment ◽  
Intersection Point ◽  
Analysis Method ◽  
Displacement Control ◽  
Short Term ◽  
Proposed Model ◽  
Reinforcement Design ◽  
Twin Tunnels

The methodology of the existing displacement control is illustrated taking the shield of twin tunnels of Line 4 underpassing the upline tunnel of existing metro Line 1, for example. Vertical, horizontal, and convergence displacement of the existing tunnel is monitored and analyzed in detail in this paper. Shield parameters are predefined and adjusted based on the feedback of the displacement of Line 1. Short-term displacement of the existing tunnel is greatly influenced by the relative distance between the shield face and the existing tunnel and shield parameters. The shapes of horizontal and convergence displacement curves are similar. Line 1 is reinforced, and a new analysis method is firstly proposed for the design of reinforcement of the existing tunnel which is verified by the analytical methods derived from prior studies. The results show that the change of reinforcement stiffness has a greater effect on the normalized bending moment and the normalized shear force of the existing tunnel, and reinforcement of 25 rings on either side of the intersection point is the best choice in this case. The proposed model can be widely applicable for reinforcement design and safety check of the existing tunnel.

The Dynamic Response Analysis of Piled Wharf System under Seismic Excitation

2012 ◽  
Vol 204-208 ◽  
pp. 2605-2609
Author(s):  
Shi Ping Zhang ◽  
Chun Yi Cui ◽  
Gang Yang ◽  
Zhong Tao Wang
Keyword(s):  
Time Integration ◽  
Time History ◽  
Bending Moment ◽  
Horizontal Displacement ◽  
Seismic Excitation ◽  
Response Analysis ◽  
Engineering Practice ◽  
Integration Algorithm ◽  
Time Integration Algorithm ◽  
Theoretical Analyses

In order to study the behavior of piled wharf system under seismic excitation, numerical analyses are conducted by employing the Newmark’s time-integration algorithm. In the computational model, both nonlinearity of subsoil and the contact behavior between pile-soil interfaces are considered. The numerical results show that the horizontal displacement extremum of all piles in time history increase with the pile height under horizontal seismic excitation. Especially, the side pile of wharf system in the bank slope appears larger horizontal displacement compared with the other piles. Furthermore, the extremum variation of horizontal acceleration and bending moment of the side pile displays a non-monotonic characteristic. Based on computational results and theoretical analyses, several conclusion remarks are drawn, which can provide valuable and referable experience to some extent for related engineering practice and design.

scholarly journals Dynamic Response Analysis of a Multiple Square Loops-String Dome under Seismic Excitation

Symmetry ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 2062
Author(s):  
Zhenwei Lin ◽  
Chao Zhang ◽  
Jucan Dong ◽  
Jianliang Ou ◽  
Li Yu
Keyword(s):  
Dynamic Response ◽  
Time History ◽  
Element Model ◽  
Internal Force ◽  
Seismic Excitation ◽  
Response Analysis ◽  
Seismic Structure ◽  
Force Response ◽  
Structural Dynamic ◽  
Seismic Arrays

The interaction between multiple loops and string cables complicates the dynamic response of triple square loops-string dome structures under seismic excitation. The internal connection between the multiple square loops-string cables and the grid beams was studies to provide a favorable reference for an anti-seismic structure. With a finite element model of the Fuzhou Strait Olympic Sports Center Gymnasium, established by SAP2000 software, the structural dynamic characteristic parameters were obtained first, and then this study adopted a time-history analysis method to study the internal force response of the cables and the roof grid beams of the multiple square loops-string dome (MSLSD) under three types of seismic array excitation. The influence of two factors, namely the seismic pulse and the near and far seismic fields, on the dynamic response of this structure was analyzed by three groups of different types of seismic excitation (PNF, NNF, PFF). As shown from the results, the first three-order vibration modes were torsional deformations caused by cables, the last five were mainly the overall roof plane vibration and antisymmetric vibration. Under the excitation of the three seismic arrays, the internal force responses of stay cables, square cables in the outer ring and the string cables were largest, while the maximum internal force response of the struts changed with the direction of seismic excitation. The largest internal force response of the roof grid beams occurred in local components such as BX3, BX7 and BY7, and the largest deformation of the beam nodes occurred in JX7, JX12 and JY4. In general, the seismic pulse and the near seismic field weakened the internal force response of the struts and cables but increased the internal force response and deformation of the dome beams, while the near and far seismic fields outweighed the seismic pulse. All the above provides an important reference for structural monitoring and seismic resistance.

Study on Dynamic Characteristics of the Position Apparatus Based on ANSYS/WORKBENCH

2012 ◽  
Vol 200 ◽  
pp. 147-150
Author(s):  
Yi Ding ◽  
Sheng Li Ma ◽  
Li Juan Zhao
Keyword(s):  
Dynamic Characteristics ◽  
Optimization Design ◽  
Response Analysis ◽  
Characteristic Analysis ◽  
Element Analysis ◽  
Structural Dynamic ◽  
Structural Dynamic Characteristics ◽  
Harmonic Response Analysis ◽  
Linear Buckling Analysis ◽  
Ansys Workbench

In order to improve the reliability of the position apparatus for vehicle seats, this paper researched on the dynamic characteristics of the position apparatus by the simulated method of finite element analysis software ANSYS/WORKBENCH. Accordingly, the results of modal analysis, harmonic response analysis and that of linear buckling analysis were obtained. That provides a basis for the vibration characteristic analysis, the diagnosis and forecast of the vibration fault as well as the optimization design of the structural dynamic characteristics.

Calculation of Vertical Bending Moment Acting on an Ultra Large Containership in Large Amplitude Waves

2015 ◽  
Author(s):  
Suresh Rajendran ◽  
Nuno Fonseca ◽  
C. Guedes Soares
Keyword(s):  
Large Amplitude ◽  
Bending Moment ◽  
Regular Waves ◽  
Structural Dynamic ◽  
Strip Theory ◽  
Structural Dynamic Characteristics ◽  
Wetted Surface Area ◽  
The Time Domain ◽  
Hydroelastic Response ◽  
Vertical Bending Moment

The time domain method is further extended here in order to calculate the hydroelastic response of an ultra large containership in regular waves. Based on strip theory, the hydrodynamic and the hydrostatic forces are calculated for the instantaneous wetted surface area. Slamming forces are calculated using a Von Karman approach in which the water pile up during slamming is neglected. Timoshenko beam which takes into account the shear deformation and rotary inertia is used to model the structural dynamic characteristics of the hull. The beam is discretized using the finite element method and the ship vibration is solved using the modal analysis. The method is used to calculate the vertical bending moment acting on an ultra large containership in large amplitude regular waves. The results are compared with the experimental results measured in wave tank.

Seismic Response Analysis of Tower Crane in Consideration of the Building-Crane Interaction

2013 ◽  
Vol 353-356 ◽  
pp. 1981-1985 ◽  
Author(s):  
Bing Ai ◽  
Jia Lin Yang ◽  
Zeng Zhuang Pei
Keyword(s):  
Seismic Response ◽  
Seismic Analysis ◽  
Dynamic Responses ◽  
Response Analysis ◽  
Analysis Method ◽  
Ansys Software ◽  
Seismic Response Analysis ◽  
3D Fem ◽  
Fem Model ◽  
Tower Crane

Interaction between buildings and tower has not been considered in former research..In this paper an integrated seismic analysis method is proposed considering the interaction between the building and the tower crane. A 3D-FEM model of the building and the crane is established with ANSYS software and seismic responses such as the displacement, the acceleration and the stress of the crane are analyzed. The sensitivity of the stiffness of the building on the dynamic responses is also analyzed. The results with consideration of the building-crane interaction, is higher than the results without interaction, and it becomes more significant with the increase of stiffness of the building.

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