scholarly journals Development and Mechanical Performance of a New Kind of Bridge Seismic Isolator for Low Seismic Regions

2013 ◽  
Vol 20 (4) ◽  
pp. 725-735 ◽  
Author(s):  
H. Zhang ◽  
J. Li ◽  
T. Peng
Keyword(s):  
Finite Element ◽  
Finite Element Methods ◽  
Seismic Isolation ◽  
Mechanical Performance ◽  
Shear Stiffness ◽  
Theoretical Method ◽  
Seismic Regions ◽  
Vertical Bearing ◽  
Elastomeric Isolator ◽  
Rubber Bearings

The concept of fibre-reinforced plate elastomeric isolator (FRPEI) is introduced firstly in this paper. Three FRPEI specimens have been constructed to evaluate the mechanical performance of the isolators by performing vertical and horizontal tests. The research focuses on the compression stiffness, the shear stiffness, the hysteretic characteristic and the vertical bearing capacity of the isolators. The experimental results show that the mechanical performance of FRPEIs can meet the requirements of bridge rubber bearings and the energy dissipation capacity is better than that of general laminated rubber bearings. Therefore, it is feasible to use FRPEIs in seismic isolation of short span bridges in low seismic regions. Theoretical and finite element methods have also been employed and the deformation assumptions applied in the theoretical method are also verified by FEM. By comparing the differences of the results of different methods, the effectivenesses of the theoretical and finite element methods are evaluated and some considerations on isolator design are proposed.

Modal Characteristics of Planar Multi-Story Frame Structures

2016 ◽  
Vol 32 (5) ◽  
pp. 501-514 ◽  
Author(s):  
H.-P. Lin ◽  
S.-C. Chang ◽  
C. Chu
Keyword(s):  
Finite Element ◽  
Linear System ◽  
Finite Element Methods ◽  
Analytical Methods ◽  
Theoretical Method ◽  
Frame Structure ◽  
Frame Structures ◽  
Modal Characteristics ◽  
Out Of Plane ◽  
The Matrix

AbstractIn linear system, in-plane motions are decoupled from out-of-plane motions for planar frame structures. A theoretical method is proposed that permits the efficient calculations of modal characteristics of planar multi-story frame structures. There are 3 × m beam components for a planar m-story frame structure. By analyzing the transverse and longitudinal motions of each component simultaneously and considering the compatibility requirements across each frame joint, the undetermined variables of the entire m-story frame structure system can be reduced to six, regardless of the number of stories, and that can be determined by the application of the boundary conditions. The main feature of this method is to decrease the dimensions of the matrix involved in the finite element methods and certain other analytical methods.

The Mechanical Performance Degradation of Steels Effected by Corrosion

2013 ◽  
Vol 774-776 ◽  
pp. 519-522
Author(s):  
Ming Qiang Lin ◽  
Feng Juan Dai ◽  
Shi Yan Song
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Stress Concentration ◽  
Mechanical Behavior ◽  
Tensile Properties ◽  
Finite Element Methods ◽  
Mechanical Performance ◽  
Performance Degradation ◽  
Mechanics Performance ◽  
Pit Depth

Corrosion of the steel affects seriously its mechanical performance. Based on the finite element methods, strength tensile properties of corroded steel were studied. Pit shapes and pit depths, pit locations, etc on the mechanical behavior of steel were studied mainly. Pit depth is major cause of produce rust steel mechanical performance degradation, because there is an obvious stress concentration phenomenon around pit, cause steel mechanics performance degraded significantly. Pit shapes and lengths may also be affected steel mechanical properties.

Equilibrium Profile of Modern Belted Radial Ply Tires: Its Determination and Performance Benefits

2013 ◽  
Vol 41 (2) ◽  
pp. 127-151
Author(s):  
Rudolf F. Bauer
Keyword(s):  
Finite Element ◽  
Aspect Ratio ◽  
Finite Element Methods ◽  
Mathematical Analysis ◽  
Internal Stresses ◽  
Stress Concentrations ◽  
Equilibrium Profiles ◽  
Equilibrium Profile ◽  
And Performance ◽  
Beneficial Property

ABSTRACT The benefits of a tire's equilibrium profile have been suggested by several authors in the published literature, and mathematical procedures were developed that represented well the behavior of bias ply tires. However, for modern belted radial ply tires, and particularly those with a lower aspect ratio, the tire constructions are much more complicated and pose new problems for a mathematical analysis. Solutions to these problems are presented in this paper, and for a modern radial touring tire the equilibrium profile was calculated together with the mold profile to produce such tires. Some construction modifications were then applied to these tires to render their profiles “nonequilibrium.” Finite element methods were used to analyze for stress concentrations and deformations within all tires that did or did not conform to equilibrium profiles. Finally, tires were built and tested to verify the predictions of these analyses. From the analysis of internal stresses and deformations on inflation and loading and from the actual tire tests, the superior durability of tires with an equilibrium profile was established, and hence it is concluded that an equilibrium profile is a beneficial property of modern belted radial ply tires.

Finite element methods for internal flow calculations

1983 ◽  
Author(s):  
W. HABASHI ◽  
M. HAFEZ ◽  
P. KOTIUGA
Keyword(s):  
Finite Element ◽  
Finite Element Methods ◽  
Internal Flow
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