高强钢筋高强混凝土简支梁抗剪试验研究

Experimental study on shear behavior of simple supported high-strength concrete beams with high-strength steel

为研究高强钢筋高强混凝土简支梁的抗剪性能,设计了5根同时采用HRBF500级高强钢筋和C80高强混凝土的简支梁,并对其进行了集中荷载作用下的剪切破坏试验,分析了不同配箍率和不同纵筋配筋率对于试件裂缝、破坏形态、挠度及承载力的影响,并将承载力的试验值与我国《混凝土结构设计规范》(GB 50010—2010)及美国ACI 318-08规范进行对比。结果表明,试验梁的破坏形态与普通梁相似,抗剪承载力随配箍率的增大而提高,按我国《混凝土结构设计规范》(GB 50010—2010)和美国ACI 318-08规范计算的承载力与实测承载力存在一定差异。

In order to study the shear performance of simple supported high-strength concrete beams with high-strength steel, five simple supported beams which were made by HRBFS00 high strength steel and C80 high strength concrete, were tested under the concentrated loads. The effects of different stirrup ratio and the amount of longitudinal reinforcement on the crack, model of failure, deflection and shear capacity were studied. The shear strength of tested beams were compared with the shear design approaches of Chinese Code for design of concrete structures（ GB 50010--2010） and American ACI 318-08 Code. The results indicate that the failure model of high-strength concrete beams with high-strength steel is similar to that of normal beams. With increasing of stirrup ratio, the shear strength of beams increases correspondingly. In comparison with the shear capacity observed in the experiment, the results of calculation by Chinese Code for design of concrete structures （GB 50010--2010） and American ACI 318-08 Code are divergent.