ACI Global Home Middle East Region Portal Western Europe Region Portal
Email Address is required Invalid Email Address
In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Learn More
Become an ACI Member
Topics In Concrete
Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 13 Abstracts search results
Document:
SP88-02
Date:
November 1, 1985
Author(s):
J. Kirkpatrick, A. E. Long, W. M. C. Stevenson, and A. Thompson
Publication:
Symposium Papers
Volume:
88
Abstract:
`The results of load tests on four prestressed concrete multi-girder bridge decks are presented. The girders have been used to form both tee and pseudo box decks each of which has its own distribution characteristics. The measured distribution of beam soffit stresses are compared with predictions using a grillage analysis. For the beam construction good correlation was obtained but for the pseudo box deck measured stresses were less than those predicted. In the latter case good correlation was obtained by substantially increasing the torsional stiffness of the transverse grillage members.
DOI:
10.14359/6258
SP88-03
Takeshi Oshiro and Sumio Hamada
Recently, significant deterioration of concrete surface and corrosion of reinforcing bars have been observed, and the necessity for the structural evaluation of such bridges becomes urgent for safety considerations. The primary objective of this study is to investigate the structural performance of two deteriorated reinforced concrete bridges and isolated test beams cut out of the same bridges at the time of replacement. Field and bending tests were conducted from which the strength of existing bridges and isolated beams was observed. Correlations of the values of strength obtained from these two tests give important data to be used for evaluation of existing deteriorated bridges. From the results of general investigations, field tests and bending tests, the following conclusions are drawn; (1) From the results of field tests of Nakama Bridge, strains of reinforcing bars and deflections are rather close to Theory II uncracked gross section), whereas those of Yaka Bridge are located between Theories I (cracked section) and II. This indicates the varying effects of deterioration on main beams. (2) Beams in bending tests yield larger strains and deflections compared with those from tests; this shows that the rigidity of a beam that is part of an existing bridge is much higher than that expected from an isolated beam. (3) According to general investigations, these two bridges were highly deteriorated in appearance. However, ultimate strength of test beams is higher than that computed by ACI Code, indicating no significant losses of strength.
10.14359/6259
SP88-04
M. Ladner
After a short survey on the development of static load tests on structures, the standard test procedure used by the Swiss Federal Laboratories for Materials Testing and Research (EMPA) is presented . From the static load tests basically the following results can be gained: the elastic behavior of a structure under the applied loads as asign for the good quality of the execution the accordance of the measured deformations withthose obtained independently on a theoretic always a sign for the good quality of the design the measured spring constant of a bridge offers the possibility to qualify the bending stiffness. This qualification is based on the results of some 330 static load testing facilities.To illustrate this, three different case histories are descreibed and discussed in this paper.
10.14359/6260
SP88-05
Mohamed I. Soliman and M. S. Mirza
Resulte of an experimental-analytical investigation on a reinforced concrete box girder bridge are presenredo The experimental phase consisted of tests on a - scale, 3 P? direct model of an intermediate span of a b* inuous box girder bridge. Experimental data from the tests under symmetrical and unsymmetrical loads were analysed using some of the available analy- sis methods. These results are combined with other available information to formulate some recommendations for design of box girder structures.
10.14359/6261
SP88-06
Michael P. Collins and Denis Mitchell
The Modified Compression Field Theory which is capable of predicting the response of reinforced and prestressed concrete members in shear is summarized. The predictions of this theory are compared with the test results of two half-scale prestressed concrete bridge girders both before and after repair. An example of evaluating a typical bridge structure is also presented,The Modified Compression Field Theory which is capable of predicting the response of reinforced and prestressed concrete members in shear is summarized. The predictions of this theory are compared with the test results of two half-scale prestressed concrete bridge girders both before and after repair. An example of evaluating a typical bridge structure is also presented,
10.14359/6262
Results Per Page 5 10 15 20 25 50 100
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Edit Module Settings to define Page Content Reviewer