集中荷载作用下钢筋混凝土连续深梁试验研究

根据非线性有限元法的分析和试验结果,本文研究了连续深梁的受力特性和破坏机理,并指出连续深梁的支座反力随跨高比的不同而变化;梁的最大弯矩发生在跨中而不是在中间支座;中间支座截面受拉区的位置随着跨高比的减小而下移;当跨高比小于或等于1.0时跨中有时不出现反弯点等现象,按作者所进行的24根连续深梁的试验资料,提出了抗弯强度与抗剪强度的计算式和构造要求,并以有限元法计算了各类连续深粱的影响线,供设计者配套使用。

Research on the Reinforced Concrete Continuous Deep Beams under Concentrated Loading

Based on the nonlinear analysis of finite element and test, the article introduces the behaviour and collapse mechanism of reinforced concete continuous deep beams. It also offers that the reaction of supports of beams varies with the change of span-depth ratio. The maximum moment of the contiuous deep beam exists in span and not at mid-supports. The position of tensile region of the section at mid-supports goes down as the span-depth ratio reduces. When the span-depth ratio is less than or egual fo1.0, no point of inflexion appears sometimes. In accordance with the data obtained from the test of 24 reinforced concrete continuous deep beams, the article provides the bending moment and shearing strength formulae and design details. Meanwhile, influence line of various continuous deep beams has been calculated through finite element method for designers.