槽钢骨架型钢混凝土梁受扭性能试验研究

为研究配槽钢骨架型钢混凝土梁在扭矩作用下的受力性能,设计了4根配槽钢骨架型钢混凝土梁和1根普通钢筋混凝土梁对比试件,通过观察配槽钢骨架型钢混凝土梁在扭矩作用下的受力过程及破坏形态,探讨混凝土强度、配箍形式、缀条形式及其间距等对试件受扭承载力的影响。试验结果表明:截面配钢率对提高梁的开裂扭矩作用不明显,但槽钢骨架能显著提高试件的极限扭矩和后期抗扭刚度,还能有效改善构件的延性。最后提出配槽钢骨架型钢混凝土梁开裂扭矩和极限扭矩的计算公式。

EXPERIMENTAL RESEARCH ON THE TORSIONAL BEHAVIORS OF CHANNEL STEEL REINFORCED CONCRETE BEAM

Four channel steel reinforced concrete beams and 1 reinforced concrete beam are tested to study the mechanical behaviors of channel steel reinforced concrete beam( CSRCB) under pure torque. The failure process and modes of the specimens are observed,the effects of concrete strength,stirrup form and lace bar form etc on the torsional bearing capacity of the specimens are discussed. It is shown that the steel ratio has no significant effect on the cracking torque of the section,but the channel steel can improve the torsional capacity,stiffness and ductility of the beam obviously. The calculating formula for cracking torsional torque and ultimate torsional capacity of the CSRCB member are also proposed.