Structure Seismic Analysis on Intake Tower of Spillway Tunnel

2014 ◽  
Vol 1065-1069 ◽  
pp. 1427-1432
Author(s):  
Yi Zhi Yan ◽  
Chang Xin Xiong ◽  
Xiao Cheng Wen ◽  
Wei Hong Li
Keyword(s):  
Seismic Design ◽  
Dynamic Stress ◽  
Seismic Analysis ◽  
Response Spectrum ◽  
Element Model ◽  
Original Design ◽  
Seismic Parameters ◽  
Tower Structure ◽  
Design Requirements ◽  
Spillway Tunnel

According to a intake tower of spillway tunnel established the intake tower structure—water—foundation 3-D finite element model for seismic analysis, by the response spectrum method in original design seismic parameters and new parameters of the project on horizontal and vertical dynamic response of the intake tower. The results shown that the structure of maximum dynamic stress concentration appeared near the junction of the tower with backfill concrete, where the weak parts of seismic, used the new seismic parameters calculated show greater damage on the tower, but couldn’t overturn, meet the seismic design requirements.

Comparative nonlinear seismic analysis of an existing RC bridge designed with obsolete codes

2022 ◽  
pp. 136943322210747
Author(s):  
Germán Nanclares ◽  
Daniel Ambrosini ◽  
Oscar Curadelli
Keyword(s):  
Numerical Model ◽  
Seismic Design ◽  
Seismic Analysis ◽  
Nonlinear Dynamic Analysis ◽  
Highway Bridges ◽  
Element Model ◽  
Cyclic Behavior ◽  
Transverse Reinforcement ◽  
3D Finite Element ◽  
Collapse Mechanisms

The evolution of seismic design and calculation criteria for highway bridges has a direct influence on their structural behavior. This paper presents a nonlinear dynamic analysis using a detailed 3D finite element model of an existing bridge, with different design criteria for the column transverse reinforcement, according to code requirements of different times. The numerical model is able to simulate both the collapse of the structure and the generation of damage in its elements when subjected to extreme seismic actions. Through the numerical model, it is possible to represent the cyclic behavior of the concrete, and to evaluate the influence of the transverse reinforcement assigned to the column on the overall response of the bridge. The formation of plastic hinges is verified, as well as the identification of different collapse mechanisms.

Evaluation of Seismic Integrity for an Integral Reactor Assembly

2004 ◽  
Author(s):  
Soon Myeon Wang ◽  
J. S. Kim ◽  
T. E. Jin ◽  
M. J. Jhung ◽  
Y. H. Choi ◽  
...  
Keyword(s):  
Modal Analysis ◽  
Seismic Analysis ◽  
Coupling Effect ◽  
Response Spectrum ◽  
Safety Margin ◽  
Time History ◽  
Element Model ◽  
Seismic Safety ◽  
Reactor Assembly ◽  
Integral Reactor

The structural integrity of integral reactor assembly of 65Mwt thermal capacity is assessed by using the commercial finite element package ANSYS in order to evaluate the seismic safety margin. First of all, the modal analyses are performed using the various analysis models with/without the fluid coupling effect in order to validate a super element model and to evaluate the coupling effect on natural frequency. Based on the modal analysis results, the seismic analyses are performed using the ground response spectrum defined in Reg. Guide 1.60. Finally, time-history analyses are performed using the modal analysis results, the super element model and an inertia load approach. As a result, the reliable and efficient seismic analysis model for an integral reactor assembly is developed and it is found that an integral reactor assembly has the sufficient seismic safety margin.

scholarly journals An Artificial Seismic Wave Suitable for Suspended Converter Valve in the UHVDC Transmission Project

2019 ◽  
Vol 118 ◽  
pp. 02039
Author(s):  
Jin Xiao ◽  
Mingduo Huang ◽  
Qiguo Sun
Keyword(s):  
Finite Element ◽  
Seismic Wave ◽  
Seismic Design ◽  
Response Spectrum ◽  
Time History ◽  
Element Model ◽  
Series Method ◽  
Long Period ◽  
Standard Response ◽  
The Finite Element Model

The finite element model of suspended converter valve in an UHVDC transmission project with characteristics of flexible is constructed, and its vibration characteristics are simulated and analyzed firstly. The results show that this kind of suspended converter valve has obvious long-period character. Secondly, the long period phase of standard response spectrum in Code for Seismic Design of Buildings (GB50011-2010) is modified, and then the artificial seismic wave is synthesized employing the triangular series method. The result shows that this artificial seismic wave has long-period character. Finally, the time-history seismic dynamic simulation of the converter valve is done, and the seismic responses of the converter valve excited by three kinds of seismic wave with different period characters are compared and analyzed. The results show that the swing and stress of the suspended converter valve are larger under the long-period seismic wave synthesized in this paper. The quasi-resonance damage caused by long-period seismic wave should be concerned specially in the actual UHVDC transmission project.

Analysis of Dynamic Response of High Rockfill Embankment under Seismic Loads

2010 ◽  
Vol 163-167 ◽  
pp. 4363-4366 ◽  
Author(s):  
Cheng Zhong Yang
Keyword(s):  
Dynamic Response ◽  
Seismic Design ◽  
Response Spectrum ◽  
Element Model ◽  
Security Evaluation ◽  
Seismic Loads ◽  
Maximum Displacement ◽  
Maximum Acceleration ◽  
Embankment Slope ◽  
The Right

To reveal the stress-strain properties of Gangou high rockfill embankment with 71m high under seismic loads and provide the reference for its security evaluation and the seismic reinforcement design. By simplifying the high rockfill embankment as the plane problem, establishing two-dimensional finite element model, inputting EL Centro and applying seismic response spectrum method, the dynamic response of high rockfill embankment under seismic loads were simulated. The results show that: With the increase of embankment height, the dynamic response presents increasing tendency; The maximum displacement occurs on the right side of the embankment top, t1474he maximum acceleration appears at the middle of embankment slope. From the view of seismic design, the right side of the embankment top and the middle of embankment slope are the focus of seismic design.

Important Components Analysis of Ceramic Rapid Molding Machine

2014 ◽  
Vol 633-634 ◽  
pp. 360-363
Author(s):  
Xiu Duan Gong ◽  
Zhou Wen ◽  
Jun Ling Zhang
Keyword(s):  
Element Model ◽  
Digital Design ◽  
Molding Machine ◽  
Original Design ◽  
Design Data ◽  
Mechanical Products ◽  
Design Requirements ◽  
Components Analysis ◽  
Set Up ◽  
The Finite Element Model

The digital design of mechanical products is usually first reference existing parts, drawings, and experience to make original design data and design requirements, according to the design of digital model is set up, after an analysis of the finite element model according to the analysis results contrast design goal to design or structure parameter changes, to the expected design purpose. Analysis of the product is an essential part of product design.

Seismic Analysis of Long Span Double-Curved Arch Bridge

2012 ◽  
Vol 594-597 ◽  
pp. 1532-1536
Author(s):  
Yun Zhang ◽  
Xiu Feng Huang ◽  
Bei Li
Keyword(s):  
Seismic Analysis ◽  
Response Spectrum ◽  
Time History ◽  
Element Model ◽  
Dynamic Features ◽  
Arch Bridge ◽  
Long Span ◽  
Crown Structure ◽  
History Analysis ◽  
Rare Earthquake

Take one long span double-curved arch bridge as the example, built the finite element model of bridge structure and analyzed the modeling method, dynamic features and response under ground motion. It demonstrates that response spectrum method could meet the calculation requirement in seismic analysis of the double-curved arch bridge, and the result accords with time-history analysis method. Bridge vibration type is dispersing in quality distribution of double-curved arch bridge; it should take adequate vibration types in bridge combination. At frequent earthquake, it is actual to considerate the coalition function between arch crown structure and the main arch ring. But at rare earthquake, the arch crown buildings of masonry structure is easy to be damaged, it is not suitable to considerate the coalition function in bridge reinforcement.

scholarly journals Application of Hilbert-Huang Transform in Generating Spectrum-Compatible Earthquake Time Histories

2011 ◽  
Vol 2011 ◽  
pp. 1-17 ◽  
Author(s):  
Shun-Hao Ni ◽  
Wei-Chau Xie ◽  
Mahesh Pandey
Keyword(s):  
Seismic Design ◽  
Seismic Analysis ◽  
Response Spectrum ◽  
Time History ◽  
Relative Difference ◽  
Hilbert Huang Transform ◽  
Analysis And Design ◽  
Design Spectra ◽  
Earthquake Records ◽  
Time Histories

Spectrum-compatible earthquake time histories have been widely used for seismic analysis and design. In this paper, a data processing method, Hilbert-Huang transform, is applied to generate earthquake time histories compatible with the target seismic design spectra based on multiple actual earthquake records. Each actual earthquake record is decomposed into several components of time-dependent amplitude and frequency by Hilbert-Huang transform. The spectrum-compatible earthquake time history is obtained by solving an optimization problem to minimize the relative difference between the response spectrum of the generated time history and the target seismic design spectra. Since the basis for generating spectrum-compatible earthquake time histories is derived from actual earthquake records by employing the Hilbert-Huang transform, the nonstationary characteristics and the natural properties of the seed earthquake records are well preserved in the generated earthquake time histories.

Quantitative assessment of seismic design provisions for buildings with torsional irregularities

2020 ◽  
pp. 875529302097096
Author(s):  
D Jared DeBock ◽  
Michael Valley ◽  
Conrad (Sandy) Hohener
Keyword(s):  
Seismic Design ◽  
Large Range ◽  
Response Spectrum ◽  
Response Spectrum Analysis ◽  
Collapse Resistance ◽  
Lateral Resistance ◽  
Earthquake Force ◽  
Design Requirements ◽  
Torsionally Flexible ◽  
Design Earthquake

ASCE/SEI 7 design requirements for seismic-induced torsion in buildings are evaluated to determine their effectiveness for resisting seismic-induced collapse of torsionally irregular buildings. The ASCE/SEI 7-16 provisions are found to be generally conservative for most torsionally irregular building configurations—exceptions are some buildings that rely heavily on lines of lateral resistance orthogonal to the design earthquake force to resist torsional moments, and also some torsionally flexible buildings designed using modal response spectrum analysis. Modifications to provide better consistency in collapse resistance over a large range of building configurations and degrees of torsional irregularity are recommended. The study also demonstrates that buildings classified as extremely torsionally irregular may not need to be prohibited from Seismic Design Categories E and F, as long as the lateral system is proportioned properly.

Seismic Analysis for the Suspended Converter Valve Tower of the UHV

2012 ◽  
Vol 187 ◽  
pp. 196-201
Author(s):  
Q.G. Sun ◽  
X.F. Wu ◽  
J.J. Di ◽  
Y.C. Zhou
Keyword(s):  
Seismic Analysis ◽  
Response Spectrum ◽  
Element Model ◽  
Vibration Modes ◽  
Analysis Method ◽  
Ansys Software ◽  
Fundamental Vibration ◽  
Response Spectrum Analysis ◽  
Earthquake Loads ◽  
Gravity Load

Based on the ANSYS software, a finite element model of a single converter valve tower of the UHV (Ultra High Volt) is built, the structure dynamic characteristics of the converter valve tower is analyzed by the modal analysis method, the earthquake response of the converter valve tower is calculated by the response spectrum analysis method. The prestress effect and the large deformation effect are taken into account in the calculation process, and the seismic responses under some complex loads which combine the earthquake loads and the gravity load are calculated. The results show that lots of natural frequencies of the converter valve tower, which is designed as a flexible structure, very low. The fundamental vibration modes are pendulum sways in X- and Y-direction. The displacements of the horizontal sway response of the converter valve tower are larger than other direction displacements. This conclusion must be considered in the reasonable arrangement design of the valve hall.

scholarly journals Comparative analysis of normative provisions for seismic design and detailing of reinforced concrete structures

2019 ◽  
Vol 12 (5) ◽  
pp. 1220-1247
Author(s):  
R. A. RODRIGUES ◽  
C. E. N. MAZZILLI ◽  
T. N. BITTENCOURT
Keyword(s):  
Reinforced Concrete ◽  
Comparative Analysis ◽  
Seismic Design ◽  
Seismic Analysis ◽  
Response Spectrum ◽  
Concrete Structures ◽  
Eurocode 8 ◽  
Reinforced Concrete Structures ◽  
Seismic Design Of Structures

Abstract The main objective of this work is to carry out a comparative analysis between the methods and provisions of the Brazilian code ABNT NBR 15421:2006 and those of the ASCE/SEI 7 and the Eurocode 8, on the seismic design of structures. The similarities and differences between these standards, as far as the application of the Equivalent Lateral Forces method (ELFM) and the Response Spectrum method (RSM) are concerned, will be addressed. The responses will be evaluated for a case study that will be modelled by the SCIA Engineer 17 software. This paper also presents some comments on the detailing of reinforced concrete structures to ensure a good performance under seismic loading, allowing for a more favourable interpretation of the seismic analysis results.

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