BEHAVIOR OF COMPOSITE CONCRETE-CASTELLATED STEEL BEAMS UNDER COMBINED FLEXURE AND TORSION
The behavior of composite concrete – castellated steel beams under combined effect of flexure and torsion was studied experimentally.Two strengthening techniques were implemented,strengthening by adding intermediate stiffeners or strengthening by both external prestress and intermediate stiffeners.The experimental program was designed in such way that nine composite concretecastellated steel specimens were tested,which are simply supported over a span of 2900 mm and divided to three main groups.Carrying capacity,load-deformation responses,and strain in both concrete and steel were recorded and analyzed.The experimental results show that the first strengthening technique improved the load carrying capacity by 26%for specimens under pure bending moment,16%for specimens under combined effect of flexure and torsion,and 6%for specimens under pure torsion,respectively.While the second strengthening technique enhanced the load carrying capacity by 186%for specimens under pure bending moment,136%for specimens under combined effect of flexure and torsion,and 7%for specimens under pure torsion,respectively.It is worth to mention that,the first technique reduced the mid span deflection under service loads by 25%and 17%for specimens under pure bending and combined flexure and torsion,respectively.While the second technique decreased,the mentioned values by 56%and 31%for specimens under pure bending and combined flexure and torsion,respectively.It was noted that,using these strengthening systems excluded certain failure modes,which are commonly happened with castellated beams.
castellated beam composite beam strengthening stiffeners external prestress
Nazar K.Oukaili Seezar Sh.Abdullah
College of Engineering,University of Baghdad,Iraq
国际会议
新加坡
英文
1-4
2017-07-19（万方平台首次上网日期，不代表论文的发表时间）