scholarly journals Collapse Analysis of Transmission Tower Subjected to Earthquake Ground Motion

2018 ◽  
Vol 2018 ◽  
pp. 1-20 ◽  
Author(s):  
Xiaohong Long ◽  
Wei Wang ◽  
Jian Fan
Keyword(s):  
Finite Element ◽  
Ground Motion ◽  
Particle Method ◽  
Earthquake Ground Motion ◽  
Particle Model ◽  
Variation Principle ◽  
Transmission Tower ◽  
Seismic Safety ◽  
Dynamic Nonlinearity ◽  
Finite Particle

The collapse of transmission towers involves a series of complex problems, including geometric nonlinearity, material nonlinearity, dynamic nonlinearity, and the failure of members. Simulation of the process of collapse is difficult using traditional finite element method (FEM), which is generated from continuum and variation principle, whereas the finite particle method (FPM) enforces equilibrium on each point. Particles are free to separate from one another, which is advantageous in the simulation of the structural collapse. This paper employs the finite particle method (FPM) to simulate the collapse of a transmission steel tower under earthquake ground motions; the three-dimensional (3D) finite particle model using MATLAB and the 3D finite element model using ANSYS of the transmission steel tower are established, respectively. And the static and elastic seismic response analyses indicate that the results of the FPM agree well with those of the FEM. To simulate the collapse of the transmission steel tower, a failure criterion based on the ideal elastic-plastic model and a failure mode are proposed. Finally, the collapse simulation of the transmission steel towers subjected to unidirectional earthquake ground motion and the collapse seismic fragility analysis can be successfully carried out using the finite particle method. The result indicates that the transmission steel tower has better seismic safety performance and anticollapse ability.

Development of Maximum Considered Earthquake Ground Motion Maps

2000 ◽  
Vol 16 (1) ◽  
pp. 21-40 ◽  
Author(s):  
Edgar V. Leyendecker ◽  
R. Joe Hunt ◽  
Arthur D. Frankel ◽  
Kenneth S. Rukstales
Keyword(s):  
Ground Motion ◽  
Seismic Design ◽  
Spectral Response ◽  
Design Procedure ◽  
Peak Ground Velocity ◽  
Earthquake Ground Motion ◽  
Ground Acceleration ◽  
Seismic Safety ◽  
Design Procedures ◽  
Seismic Rehabilitation

The 1997 NEHRP Recommended Provisions for Seismic Regulations for New Buildings use a design procedure that is based on spectral response acceleration rather than the traditional peak ground acceleration, peak ground velocity, or zone factors. The spectral response accelerations are obtained from maps prepared following the recommendations of the Building Seismic Safety Council's (BSSC) Seismic Design Procedures Group (SDPG). The SDPG-recommended maps, the Maximum Considered Earthquake (MCE) Ground Motion Maps, are based on the U.S. Geological Survey (USGS) probabilistic hazard maps with additional modifications incorporating deterministic ground motions in selected areas and the application of engineering judgement. The MCE ground motion maps included with the 1997 NEHRP Provisions also serve as the basis for the ground motion maps used in the seismic design portions of the 2000 International Building Code and the 2000 International Residential Code. Additionally the design maps prepared for the 1997 NEHRP Provisions, combined with selected USGS probabilistic maps, are used with the 1997 NEHRP Guidelines for the Seismic Rehabilitation of Buildings.

Compression Capacity and the Seismic Integrity of Locally Deformed Line Pipes

2018 ◽  
Author(s):  
Atsushi Suganuma ◽  
Junpei Kono ◽  
Masataka Hayashiguchi
Keyword(s):  
Finite Element ◽  
Ground Motion ◽  
Strain Curve ◽  
Gas Pipeline ◽  
Earthquake Ground Motion ◽  
Finite Element Analyses ◽  
Compression Tests ◽  
Design Guideline ◽  
Line Pipe ◽  
Strain Capacity

This paper discusses the effects of local deformation, dent, and strain hardening properties on strain capacity in compression of a line pipe. Compression tests were conducted using two pipes with the nominal diameter of 400mm. These pipes had roundhouse type stress-strain curve, and correspond to L290 grade in Spec 5L of API (American Petroleum Institute) standards. One pipe was a plain pipe without dent, The other was a dented pipe. The depth of the dent was about 3% of the diameter. The test results explain that the strain capacity can be reduced by 25% due to the effect of dent. A series of finite element analyses were conducted to investigate the compression behaviors. The strain capacity in compression was defined as the longitudinal critical remote strain whose strain distribution was free from the effects of a dent. At first, that finite element analyses were verified that they could reproduce the results of compression tests. Next, the size of dent were changed on that finite element analyses model, some different case were analyzed in order to investigate the changes of the strain capacity in compression. The strain capacity, the longitudinal critical remote strain, decreased to about a half in case of 3%-depth dent, compared with a plain pipe. Seismic integrity of the pipeline with a dent is discussed in accordance with the seismic design guideline issued by Japan Gas Association. In case of the strong earthquake, “Ground Motion Level-1”, the dented gas pipeline is safe, even if the depth of the dent is 10% of the diameter. In case of the maximum earthquake, “Ground Motion Level-2”, the gas pipeline might buckle longitudinally in soft ground.

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