Abstract
The shear span-to-depth ratio has the most significant influence on the shear capacity of beams and determines their failure mode. The subject of the current project is the shear capacity of precast posttensioned concrete crane beams disassembled after more than fifty years of being used in an industrial plant. The paper gives the theoretical basis for the shear capacity of such elements as well as standard design models. The conducted tests showed that despite the low shear reinforcement ratio, the elements do not fail in a brittle mode but show a clear indication of prospective destruction. It was also confirmed that in the case of poorly shear-reinforced PC elements, a clear arch action can be distinguished with a low shear span-to-depth ratio, whereas in the case of a higher ratio there is a classical beam action.
Highlights
The shear span-to-depth ratio has the most significant influence on the shear capacity of beams and determines their failure mode
The issue of shear capacity of RC members with a low amount of transverse reinforcement has been discussed by numerous researchers, the number of scientific works related to prestressed concrete members is very limited
Zsutty [6] conducted a statistical analysis of the results of available experimental studies carried out on supported beams loaded with concentrated forces. He divided the elements into two groups: the first group consisted of elements with shear span-to-depth ratio a/d 2.5 showing beam action, while the second group consisted of elements with a/d ratio < 2.5 showing arch action
Summary
Since the early development of concrete structure design, a consistent approach has been sought for the design of members subjected to shear without transverse reinforcement or with a low ratio of transverse reinforcement. The assessment of the shear capacity of elements without shear reinforcement or with a low ratio of transversal reinforcement is a very complex issue and is determined by a variety of parameters. The issue of shear capacity of RC members with a low amount of transverse reinforcement has been discussed by numerous researchers, the number of scientific works related to prestressed concrete members is very limited. The subject of the current project is the shear capacity of precast prestressed concrete crane beams disassembled after more than fifty years of being used in an industrial plant [1]. During their service life, they served as a track for overhead cranes with a lifting capacity of 12.5 tons.
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