钢纤维全轻混凝土无腹筋梁抗剪性能试验研究-结构工程专业论文.docxVIP

摘要 万方数据 钢纤维全轻混凝土无腹筋梁抗剪性能试验研究 摘 要 混凝土是土木工程建设中应用广、用量大的建筑材料。自从混凝土问世，减其自重、 增其韧性就一直是研究的重点，钢纤维轻骨料混凝土的出现很好地解决了这一难题。对 于这一新型材料，目前国内外的学者主要着重于材料性能的研究，对构件的研究还不多， 尤其是构件的抗剪性能。本文试验有 26 根钢纤维全轻混凝土无腹筋梁，主要研究了不 同剪跨比、钢纤维掺量、受拉纵筋配筋率和混凝土强度对试验梁开裂荷载和受剪承载力 的影响规律，以及承载力的计算公式。本文试验研究成果可归纳如下： 钢纤维全轻混凝土无腹筋梁的破坏形态与普通混凝土相似，但是判定破坏形态的临 界值有所不同。当剪跨比不超过 1.5 时，发生斜压破坏，当剪跨比超过 3.0 时，发生斜 拉破坏，当剪跨比处于 1.5 和 3.0 之间时，发生剪压破坏；钢纤维的掺量达到一定值时 （本试验是 0.4%），才能发挥其增强作用，试验梁的开裂荷载和极限荷载都有所增加。 随着剪跨比的增大，试验梁的承载力呈下降趋势。纵筋配筋率提高，试验梁的承载力也 随之提高。 用本次试验的数据验证了适合于钢纤维全轻混凝土无腹筋梁开裂荷载的计算公式， 并回归了受剪承载力的计算公式。 本文的试验结果可为钢纤维全轻混凝土的研究及工程应用提供参考。 关键词：钢纤维全轻混凝土；无腹筋梁；剪跨比；钢纤维掺量；抗剪性能 I 华北水利水电大学硕士学位论文 II ABSTRACT EXPERIMENTAL STUDY ON SHEAR BEHAVIORS OF STEEL FIBER REINFORCED FULL-LIGHTWEIGHT CONCRETE BEAMS WITHOUT WEB REINFORCEMENT ABSTRACT Concrete is a kind of large amount building materials applied widely in the construction of civil engineering. Since the advent of concrete, reducing its weight and increasing its toughness has been the research focus, which could be well solved by the steel fiber reinforced lightweight aggregate concrete. As for a new material, scholars both at home and abroad mainly focus on the research of the material performance while they did not pay much more attention to the research about the behaviors of structural components, especially not to the shear performance of the component. The experiment in this paper has 26 steel fiber reinforced full-lightweight concrete beams without web reinforcement. This paper mainly studies the changes of cracking load and shear bearing capacity of these beams with different shear-to-span ratio, steel fiber content, longitudinal reinforcement ratio and concrete strength. And then the formula for calculation of shear capacity is proposed. The test results can be summarized as follows: The shear failure modes of steel fiber reinforced full-lightweight concrete beams are similar to those of the ordinary reinforced concrete beams, except the different critical values determing the failure modes. The ba