配筋钢纤维高强混凝土薄壁箱梁纯扭试验研究

Experimental research on the reinforced steel fiber high-strength concrete pure torsional thin-walled box girder

研究了配筋钢纤维高强混凝土薄壁箱梁纯扭的受力性能;介绍了试件设计及其材料力学性能、施扭装置和各种测量方法;分析了各级扭矩荷载作用下,构件线扭转角、跨中截面畸变、钢筋(纵筋和箍筋)的应变、构件混凝土开裂后截面不同位置处裂缝沿纵向夹角的规律;探讨了配筋钢纤维高强混凝土薄壁箱形梁受扭破坏机理并提出了相应的开裂扭矩和极限扭矩计算公式,计算结果与试验结果吻合较好。

A full test on the behaviors of reinforced steel fiber high-strength concrete pure torsional thin-walled box girder has been performed. Design and material properties of the specimen, torsional device, and various measure means have been introduced. Under different torsion levels, the angle of twist, distortion in the middle section, steel strains, angles of inclination in different situation of section after concrete cracking have been studied. The calculation formulae about crack torsion and ultimate torsion of reinforced steel fiber high-strength concrete pure torsional thin-walled box girder have been proposed. Comparison shows a good agreement between the calculated results and the test results.