Abstract
Seven simply supported steel beams were tested to explain the effect of strengthening by external prestressing strands. All of the beams have the same steel section, clear span length and the strengthening samples which implemented by two external prestressing strands. The tested beams are divided into two categories according to existing of external prestressing strands, the first category consists of one steel beam as a reference, while, the second group deals with steel beams strengthening by external prestressing strands and consists of six steel beams divided according to the eccentricity location of prestressing strand with jacking stress (815 MPa). From experimental results, it was found that the moment curvature curves behavior for the tested beams are stiffer and with less ductility than the reference beams and the ultimate moment capacity is increased with increasing the eccentricity location. While, the maximum radius of curvature at bottom flange decreases with increasing the eccentricity location as compare with the reference beam.
Highlights
Steel is the most important construction material at the present time due to the high strength to weight ratio, uniform and homogeneous properties, high ductility, ability to be recycled, high elastic modules, high amount of energy absorption in seismic action, easier, quicker to fabricate and erect
The tested beams are divided into two categories according to existing of external prestressing strands, the first category consists of one steel beam as a reference, while, the second group deals with steel beams strengthening by external prestressing strands and consists of six steel beams divided according to the eccentricity location of prestressing strand with jacking stress (815 maximum curvature (φexp) at (MPa))
One can be observed that the maximum applied load increase with increasing the eccentricity locations that due to exist of external prestressing strand which improved the web resistance and bottom flange and it's contributed with the steel beams to resist the applied load
Summary
Steel is the most important construction material at the present time due to the high strength to weight ratio, uniform and homogeneous properties, high ductility, ability to be recycled, high elastic modules, high amount of energy absorption in seismic action, easier, quicker to fabricate and erect. Dimension of beams and column in steel frame can be reduced because of the low ultimate load to self-weight ratio. External prestressing refers to a posttensioning method in which tendons are placed on the outside of a structural member and prestressing forces are transferred to the structural member through anchorages and deviators. It is a wonderful method in strengthening and rehabilitation of old structural members, generally it is used for developing buildings and bridges for fatigue state and over loading design expected[4]. Engineers have found new mothed to improve of the original steel section strengths by external prestressing strand. Strengthening by external prestressing strands and compared with the reference steel beam
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