钢筋混凝土简支深梁破坏形态的试验研究

给出２１根钢筋混凝土（以下简称砼）简支深梁的试验结果，根据试验结果对深 梁的工作性能与破坏形态进行了分析。试件设计考虑几何尺寸．配筋形式及材料强度 等参数，试验中采取不同的作用方式，同时分析和讨论了各种参数和作用方式的影响。 分析结果表明：深梁工作性能与浅梁不同，特别是在斜裂缝出现后．形成拉杆拱受 力体系，使深梁承载能力明显提高；深梁破坏形态与配筋数量和作用方式有关；深梁 极限承载力与砼标号和跨高比、剪跨比等几何条件有关，将试验结果与新规范修正稿 提出的公式进行了比较，并对规范公式进行了讨论．

Experimental Research of R/C Simply Supported Deep Beams on Failure Mode

Based on the experimental results of 21 specimens of R/C simply supported deep beams, it has been proved that the behaviour of deep beams is different from that of thin beams. Normal strain distribution at a cross section deviates from the hypothesis of Bernoulli and Navier. The steel reinforcement stresses are gradually tending toward identity at failure. After occurrence of diagonal cracks the deep beam works like a tie-bar arch, so that the bearing capacity is remarkably increased. The action of relevant parameters, which influence the ultimate bearing capacity and failure mode of deep beam, ise discussed. The failure modes are of flexure, shear, flexure-shear or local failure types and the major influential parameters are percentage and form of steel reinforcement. The ultimate bearing capacity is controlled by strength of concrete and geometrical dimension, cspecially by the shear-span ratio. Furthermore, the experimental results are compared with the computational results by formulae of new R/C Structure Code.