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International Concrete Abstracts Portal

Showing 1-5 of 12 Abstracts search results

Document: 

SP130-11

Date: 

January 1, 1992

Author(s):

P. Carrato

Publication:

Symposium Papers

Volume:

130

Abstract:

Paper describes experimental and analytical investigation of the performance of base plates subjected to relatively large overturning moments. The experimental work established performance characteristics and ultimate failure modes for four different base plate configurations in which plate thickness and bolt stiffness are independent variables. The analytical investigation used standard linear elastic finite element models to predict experimental results. Recommended finite element modeling techniques are included.

DOI:

10.14359/1277


Document: 

SP130-10

Date: 

January 1, 1992

Author(s):

J. Furche and R. Eligehausen

Publication:

Symposium Papers

Volume:

130

Abstract:

Pullout tests with headed studs placed near a free edge have been carried out. In most of the tests, blow-out failure occurred. On the basis of this and other available test results, an empirical equation to calculate the failure load was derived. The equation takes into account the influence of the edge distance, the concrete strength, and the load-bearing area. The equation to calculate the failure load shows good agreement with the test results. The equation to calculate the critical edge distance at which the failure mode changes to steel rupture or to concrete cone failure is given. The values for critical edge distance are different from the values in ACI 349, Appendix B, because ACI 349 overestimates the concrete capacity for large edge distances.

DOI:

10.14359/1276


Document: 

SP130-09

Date: 

January 1, 1992

Author(s):

T. Balough, G. Kovacshazy and A. Frigey

Publication:

Symposium Papers

Volume:

130

Abstract:

Sixty-six pullout tests were conducted on cast-in-place concrete anchors consisting of a threaded rod with a washer and two nuts, nonsymmetrical deformed anchors, and formed anchor heads. The purpose of the test program was to compare the behavior of these three anchors and to check the reliability of the ACI 349-85 standard calculation method. All the anchors were cast in 300 x 300 x 150 mm unreinforced concrete blocks. The test variables were concrete strength, embedment depth and edge distance. The test results showed that if the failure mode is a concrete shear cone failure, the values calculated using the ACI 349-85 standard calculation method, without a strength reduction factor, will provide a good prediction. If splitting or pullout failure occurs, the pullout force will be 25 percent lower. The effect of anchorage depth is overestimated by the ACI 349-85 standard model. A strength reduction factor = 0.50 is proposed to achieve a 95 percent probability that failure loads for steel embedment will exceed the ACI 349-85 theoretical value. Formed anchor heads are recommended as a standard.

DOI:

10.14359/1275


Document: 

SP130-08

Date: 

January 1, 1992

Author(s):

W. Ammann

Publication:

Symposium Papers

Volume:

130

Abstract:

Paper summarizes experimental investigations of the static and dynamic long-term behavior of anchors. Creep behavior and loss of anchor pretension are examined and consequences on the fatigue behavior of anchors subjected to dynamic excitations are shown. Environmental influences, such as moisture or temperature, on the long-term behavior of anchors are also discussed.

DOI:

10.14359/1274


Document: 

SP130-07

Date: 

January 1, 1992

Author(s):

E. Vintzelou and R. Eligehausen.

Publication:

Symposium Papers

Volume:

130

Abstract:

An experimental program was carried out to investigate the behavior of metallic fasteners (undercut, torque-controlled, expansion, and chemical anchors) embedded in cracked concrete and subjected to shear displacements. The results show that the behavior of all three types of anchors under shear displacements is similar. Fasteners situated close to an edge and loaded towards the edge exhibit brittle concrete failure. Cyclic loadings are possible only for displacements that are much lower than the values corresponding to the monotonic peak load. Fastenings away from an edge will cause steel failure with large displacements. During cyclic loading, a severe force-response degradation was observed. Empirical formulas are proposed to predict the strength of anchors, as well as strength degradation during cyclic loading.

DOI:

10.14359/1272


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