Forensic Estimation of Uplift of an Anchored Tank During the 2011 Earthquake Off the Pacific Coast of Tohoku

2019 ◽  
Author(s):  
Yuichi Yoshida ◽  
Tomoyo Taniguchi ◽  
Teruhiro Nakashima ◽  
Ken Hatayama
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Pacific Coast ◽  
Time History ◽  
Calculation Methods ◽  
Element Analysis ◽  
Explicit Finite Element ◽  
Explicit Finite Element Analysis ◽  
The Pacific ◽  
Anchor Bolts

Abstract The reconnaissance just after the 2011 earthquake off the Pacific coast of Tohoku reported the pulling out of anchor bolts of an upright cylindrical tank. Regarding the tank as an unanchored tank and employing the accelerogram recorded at 2 km off the tank, uplift of the unanchored tank during the 2011 earthquake off the Pacific coast of Tohoku was forensically examined. The time history of the uplift displacement of the tank computed by the explicit finite element analysis reveals that the unanchored tank uplifts during the earthquake and its uplift displacement is more than the length of the pulling out of the anchor bolts found by the reconnaissance. This implicitly corroborates applicability of the explicit finite element analysis to analyzing the tank rocking behavior. In addition to that, the uplift displacement of the unanchored tank was estimated by some calculation methods available to date and compared with that computed by the explicit finite element analysis. Comparison reveals that the calculation methods used herein may likely overestimate the uplift displacement of the unanchored tank and need to improve their calculation accuracy.

Enhancement of Uplift Displacement of Tanks due to Out-of-Round Deformation of Cylindrical Shell

2019 ◽  
Author(s):  
Yoshiyuki Miyauchi ◽  
Tomoyo Taniguchi ◽  
Teruhiro Nakashima ◽  
Junichi Hongu ◽  
Daisuke Okui
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cylindrical Shell ◽  
Shaking Table Test ◽  
Time History ◽  
Shaking Table ◽  
Element Analysis ◽  
Tank Model ◽  
Explicit Finite Element ◽  
Explicit Finite Element Analysis

Abstract Two unanchored vinyl chloride scale tank models, whose diameter, height and thickness of their shell and base were 860 mm, 400 mm and 0.5 mm respectively, were set on a shaking table for experiencing the horizontal motion. These scale tank models satisfy law of similarity to have an equivalent strain under the action of loads. The first scale tank model has no stiffeners on its cylindrical shell that allows out-of-round deformation of the cylindrical shell during the shaking table test. To understand effects of the out-of-round deformation of the cylindrical shell on the tank uplift, the sweeping test is carried out. The Operational Modal Analysis clarifies that the out-of-round deformation of the cylindrical shell enhances the uplift displacement by denting a part of cylindrical shell. The second scale tank model has the multi-stage stiffeners on its cylindrical shell to prevent its out-of-round deformation during the shaking table test. The primary purpose of the second test is to verify applicability of the explicit finite element analysis for analyzing the tank rocking motion. The time history of the uplift displacement of the tank base during a seismic excitation is measured and compared with that computed by the explicit finite element analysis. The comparison shows that the explicit finite element analysis adequately reproduces the tank rocking behavior.

Tire Cornering Simulation Using an Explicit Finite Element Analysis Code

1998 ◽  
Vol 26 (2) ◽  
pp. 109-119 ◽  
Author(s):  
M. Koishi ◽  
K. Kabe ◽  
M. Shiratori
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Test System ◽  
Experimental Results ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Explicit Finite Element ◽  
Explicit Finite Element Analysis ◽  
Element Method

Abstract The finite element method has been used widely in tire engineering. Most tire simulations using the finite element method are static analyses, because tires are very complex nonlinear structures. Recently, transient phenomena have been studied with explicit finite element analysis codes. In this paper, the authors demonstrate the feasibility of tire cornering simulation using an explicit finite element code, PAM-SHOCK. First, we propose the cornering simulation using the explicit finite element analysis code. To demonstrate the efficiency of the proposed simulation, computed cornering forces for a 175SR14 tire are compared with experimental results from an MTS Flat-Trac Tire Test System. The computed cornering forces agree well with experimental results. After that, parametric studies are conducted by using the proposed simulation.

Explicit Finite Element Analysis of Coastal Bridges under Extreme Hurricane Waves

2021 ◽  
Author(s):  
Arsalan Majlesi ◽  
Reza Nasouri ◽  
Adnan Shahriar ◽  
David Amori ◽  
Arturo Montoya ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
Explicit Finite Element ◽  
Coastal Bridges ◽  
Explicit Finite Element Analysis

An Evaluation of Submarine Collisions to a TLP

2018 ◽  
Author(s):  
Martin Storheim ◽  
Cato Dørum
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Suspension Bridge ◽  
Element Analysis ◽  
Explicit Finite Element ◽  
Explicit Finite Element Analysis ◽  
Engineering Study ◽  
Large Water ◽  
Transient Failure ◽  
Water Depths

An engineering study was performed in 2017 to develop a multi-span suspension bridge on floating foundations across the Bjørnafjorden in Norway. The bridge was approximately five kilometers long and consisted of three main suspension spans supported by four pylons (towers). Two of the pylons were supported on tension-leg platforms (TLP) due to large water depths. The bridge has to be resistant towards collisions from passing ships. However, submarine impacts to the submerged parts of the bridge were also a challenge due to the bridge location being close to an active submarine training field. This paper focus on the response of one such TLP towards collisions from submarines transiting below the bridge. Nonlinear explicit finite element analysis is used to study the possible collision scenarios, and the response of the TLP and the resulting bridge motion is evaluated. Further, transient failure of a tether was investigated to assess possible consequences of rupture of one of the tethers.

Sign in / Sign up

Export Citation Format

Share Document