钢纤维全轻混凝土梁斜截面开裂荷载试验研究

Experimental study on inclined section cracking load of steel fiber reinforced full-lightweight concrete beams

为进一步研究钢纤维全轻混凝土梁斜截面开裂荷载的影响因素及计算公式,运用反位试验加载装置,采用两点对称集中加载的方法,对18根试验梁进行试验,并分析了剪跨比λ、钢纤维掺量ρf对钢纤维全轻混凝土开裂剪应力的影响。结果表明:随着剪跨比的增大,钢纤维全轻混凝土斜截面开裂时的剪应力不断减小;当钢纤维掺量增加时,钢纤维全轻混凝土剪应力随之增加。同时将混凝土抗剪开裂荷载的计算值与试验值进行对比,推导出适合钢纤维全轻混凝土梁开裂荷载的计算公式。

In order to further study the influence factors of the oblique section of steel fiber concrete beam light cracking load and calculation formula,by using reverse test loading device and the method of two symmetrical concentrated loads,18 experimental beams are made in this test to the effect of shear stress of contrast variable shear span ratio,steel fiber content changes of lambda Rho f on steel fiber light concrete cracking. The results show that the shear stress decreases with the increase of shear span ratio,and the shear stress increases with the increase of steel fiber content. At the same time,by comparing the practical calculation of concrete shear cracking load and the cracking load test of steel fiber light concrete,a formula for cracking load of steel fiber light concrete beam is proposed.