Nonlinear Viscosity Law in Finite-Element Analysis of High Damping Rubber Bearings and Expansion Joints

2015 ◽  
Vol 141 (6) ◽  
pp. 04014169 ◽  
Author(s):  
A. F. M. S. Amin ◽  
A. R. Bhuiyan ◽  
T. Hossain ◽  
Y. Okui
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
Expansion Joints ◽  
High Damping Rubber Bearings ◽  
Nonlinear Viscosity ◽  
High Damping Rubber ◽  
Rubber Bearings

scholarly journals Thermal Stress Analysis of Process Piping System Installed on LNG Vessel Subject to Hull Design Loads

2020 ◽  
Vol 8 (11) ◽  
pp. 926
Author(s):  
Se-Yun Hwang ◽  
Min-Seok Kim ◽  
Jang-Hyun Lee
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Analysis ◽  
Evaluation Model ◽  
Element Model ◽  
Piping System ◽  
Wave Load ◽  
Element Analysis ◽  
Expansion Joints ◽  
Load Conditions

In this paper, the procedure for the strength evaluation of the piping system installed on liquefied natural gas (LNG) carriers is discussed. A procedure that accounts for the ship’s wave load and hull motion acceleration (as well as the deformation due to the thermal expansion and contraction experienced by the hull during seafaring operations) is presented. The load due to the temperature and self-weight of the piping installed on the deck is also considered. Various operating and load conditions of the LNG piping system are analyzed. Stress analysis is performed by combining various conditions of sustained, occasional, and expansion loads. Stress is assessed using finite element analysis based on beam elements that represent the behavior of the piping. The attributes of the piping system components (such as valves, expansion joints, and supports) are represented in the finite element model while CAESAR-II, a commercial software is used for finite element analysis. Component modeling, load assignment, and load combinations are presented to evaluate pipe stresses under various load conditions. An evaluation model is selected for the piping arrangement of LNG and the evaluated stress is compared with the allowable stress defined by the American Society of Mechanical Engineers (ASME).

Evaluation for Mechanical Properties of Laminated Rubber Bearings Using Finite Element Analysis

2004 ◽  
Vol 126 (1) ◽  
pp. 134-140 ◽  
Author(s):  
Akihiro Matsuda
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Natural Rubber ◽  
Mixed Method ◽  
Evaluation Method ◽  
Softening Effect ◽  
Element Analysis ◽  
High Damping Rubber ◽  
Rubber Bearings ◽  
Simple Numerical Model

In this paper, improvements of evaluation method for mechanical properties of rubber materials and isolated rubber bearings are shown. The displacement/pressure mixed method of hyperelastic material considering the viscoelastic effect, compressibility and the softening effect for high damping rubber is formulated in the first place. Also, simple numerical model of the high damping rubber is proposed from experimental results. Mechanical properties of both high damping and natural rubber are calculated by developed finite element code. Next, an evaluation methods for mechanical properties (horizontal, vertical and horizontal-vertical coupled properties) of the natural rubber bearings is shown.

scholarly journals Responses of Building Base Isolated With High Damping Rubber Bearings

2019 ◽  
Vol 8 (9) ◽  
pp. 1287-1292
Keyword(s):  
Seismic Isolation ◽  
Design Procedure ◽  
Hysteretic Model ◽  
Base Shear ◽  
Ground Acceleration ◽  
Element Analysis ◽  
High Damping Rubber Bearings ◽  
Fixed Base ◽  
High Damping Rubber ◽  
Rubber Bearings

Seismic isolation is one of the most efficient techniques to protect structures against earthquakes. Rubber bearings are suitable for low-rise and medium-rise buildings due to its durability and easy fabrication. This paper presents the hori-zontal response of a six-storey base-isolated building using high damping rubber bearings (HDRB) under two ground motions of earthquakes as types I and II in JRA (2002) by finite element analysis. In this analysis, these bearings are mod-elled by the bilinear hysteretic model which is indicated in JRA and AASHTO. Comparison of horizontal response including base shear force and roof level acceleration between the two cases: base-isolated building and fixed-base building is carried out to evaluate the effectiveness of the use of HDRB on the protection of buildings from earthquakes. The numerical results show that the peak value of roof floor acceleration of the fixed-base building is two times higher than that of the base-isolated building, and the floor accelerations depend on the peak values of ground acceleration. In addition, the step-by-step design procedure for deter-mining the size of HDRBs used for buildings is also presented in this paper.

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