混凝土强度对无腹筋板抗剪强度的影响

本文在试验的基础上探讨了混凝土强度对无腹筋板抗剪性能的影响。通过试验发现在同样条件下,较高强度的混凝土板截面的破坏机理,破坏形态、销栓力和抗剪强度跟普通标号混凝土板的一般规律不相符,並侧重分析研究了f_(cu)、f_t和f_(cu)~(1/2)对抗剪强度的影响。本文认为混凝土强度是影响无腹筋板斜截面抵剪性能的主要因素之一;混凝土强度与无腹筋板抗剪强度的关系可有三种表达式,其中V=K_1 f_(cu)不宜采用;V=K_2f_t与试验结果的符合程度较好;随着混凝土向高强方向发展的趋势,采用V=K_3f_(cu)~(1/2)的形式是理想的。

Effect on Concrete Strength on Shear Strength of Slabs Without Web Reinforcements

In this paper , the effect of concrete strength on shear strength of slabs without web reinforcements is discussed on the basis of tests . From the tests , the authors found that under the same condition , the fracture mechanism and form, the dowel effect and the shear strength of the oblique section of relatively high strength concrete slabs are different from those of general concrete slabs . The emphasis is put on the analysis to the effects of fcu,ft and fcu~(1/2) on shear strengths . The authors considered that concrete strength is one of the main factors which effect the shear strength of oblique section of the slab without wet reinforcements There are three expressions of the effects of concrete strength on shear strength as shown in the following: V=K_1fcu. which is not proper for use; V = K_2 ft, which is in agreement with test result; V = K_3 fcu~(1/2). which is satisfactory for the high strength concrete.