A new test method for determining the shear modulus of elastomeric bridge bearings PDF Download
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Author: Cem Topkaya
Publisher:
ISBN:
Category :
Languages : en
Pages : 72
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Book Description
Author: Cem Topkaya
Publisher:
ISBN:
Category :
Languages : en
Pages : 72
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Book Description
Author: Reza Akbari
Publisher:
ISBN:
Category : Modal analysis
Languages : en
Pages : 10
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Book Description
The current methods for the determination of the shear modulus for elastomeric bearings consist of the testing on a rather small part of the specimen cut from the manufactured bearing. Hence, such tests are destructive and at the same time, may not essentially represent the corresponding properties of the full size specimen with sufficient accuracy, due to the so-called "size effects." Here, a modal-based nondestructive test method has been proposed which requires a rather simple modal testing apparatus and can be applied to find some important dynamic characteristics of the elastomeric bearings as well as its shear modulus. After the derivation of the dynamic characteristics of the specimens from modal analysis, the shear modulus has been obtained from modal analysis in conjunction with finite element analysis with different material properties that requires a series of finite element analyses based on a simple trial and error procedure. Four test specimens have been used and several tests have been carried out on each. Two of the test specimens were new elestomeric bearings and the other two were used bearings which have been in service for 35 years. The results demonstrate that the proposed method is a suitable manner in which important characteristics of the elastomeric bearings can be quantitatively obtained. Comparison of the results obtained from this method and conventional tests by ASTM have been discussed and some comments have been given on the results of tests on the new and old specimens.
Author: J. A. Yura
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 132
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Author: James M. Kelly
Publisher: Springer Science & Business Media
ISBN: 1447133595
Category : Technology & Engineering
Languages : en
Pages : 134
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Book Description
My involvement in the use of natural rubber as a method for the protec 1976. At that time, tion of buildings against earthquake attack began in I was working on the development of energy-dissipating devices for the same purpose and had developed and tested a device that was even tually used in a stepping-bridge structure, this being a form of partial isolation. It became clear to me that in order to use these energy devices for the earthquake protection of buildings, it would be best to combine them with an isolation system which would give them the large displace ments needed to develop sufficient hysteresis. At this appropriate point in time, I was approached by Dr. C. J. Derham, then of the Malaysian Rubber Producers' Research Association (MRPRA), who asked if I was interested in looking at the possibility of conducting shaking table tests at the Earthquake Simulator Laboratory to see to what extent natural rubber bearings could be used to protect buildings from earthquakes. Very soon after this meeting, we were able to do such a test using a 20-ton model and hand-made isolators. The eady tests were very promising. Accordingly, a further set of tests was done with a more realistic five storey model weighing 40 tons with bearings that were commercially made. In both of the test series, the isolators were used both alone and with a number of different types of energy-dissipating devices to en hance damping.
Author:
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Category : Highway research
Languages : en
Pages : 684
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Book Description
Author: John F. Stanton
Publisher: Transportation Research Board
ISBN: 9780309066143
Category : Technology & Engineering
Languages : en
Pages : 416
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Author: Joel Kimbrough Morre
Publisher:
ISBN:
Category :
Languages : en
Pages : 250
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1072
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Author: D J Lee
Publisher: CRC Press
ISBN: 1482266997
Category : Architecture
Languages : en
Pages : 221
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Book Description
This book provides a guide to movement and restraint in bridges for bridge engineers and will enable them to draw up design calculations and specifications for effective installation, and satisfactory service and durability of bearings and joints. It has been fully revised and updated in line with current codes and design practice, modern developme
Author: KL. Fishman
Publisher:
ISBN:
Category : Bulk modulus
Languages : en
Pages : 7
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Book Description
The objective of this study was to examine prospective tests for determining the bulk modulus of elastomers used in the construction of elastomeric bearings. Because elastomeric materials are nearly incompressible, relatively slight volume changes are experienced during isotropic compression, sizably governing the accuracy of test measurements. For this reason major topics of interest are equipment calibration, test repeatability, and error accountability.
