INFLUENCE OF STEEL FIBERS ON THE SHEAR RESISTANCE OF LIGHTWEIGHT CONCRETE I-BEAMS
INFLUENCE OF STEEL FIBERS ON THE SHEAR RESISTANCE OF LIGHTWEIGHT CONCRETE I-BEAMS
复制标题
钢纤维对轻质混凝土工字梁抗剪性能的影响
DOI：
10.14359/4201
复制
发表时间：
1993
影响因子：
1.8
通讯作者：
Andy T. P. Chiam
中科院分区：
文献类型：
--
作者：
R. N. Swamy;Royston Jones;Andy T. P. Chiam
本文评估了钢纤维单独用作轻量混凝土梁的抗剪钢筋的有效性。试验是在具有薄腹板和变张力钢和剪切跨度的全尺寸工字梁上进行的。纤维大大减少了梁在所有荷载水平下的变形，控制了榫缝和剪切开裂，减少了盖板的剥落，并有助于保持结构构件的延展性和整体完整性。抗剪强度提高了60% ~ 200%。，但在大剪跨试验中，仅在钢筋张力为1.55%的梁和钢筋张力为2.76%的梁中发生了弯曲破坏。提出了一种桁架模型来预测混凝土梁的极限抗剪强度，结果表明，该模型对轻、常重混凝土梁的抗剪承载力均有较好的预测效果。
The paper assesses the effectiveness of steel fibers used alone as shear reinforcement in lightweight concrete beams. The tests were carried out on full-size I-beams with thin webs and varying tension steel and shear span. The fibers reduced the beam deformations substantially at all load levels, controlled dowel and shear cracking, reduced spalling in the cover, and helped to preserve the ductility and overall integrity of the structural member. The ultimate shear strength was increased by amounts of 60 to 200 %., but flexural failure was achieved only in beams with 1.55 % tension steel and in beams with 2.76 % tension steel tested at large shear spans. A truss model is proposed to predict the the ultimate shear strength, and it is shown that the model predicts satisfactorily the shear resistance of both lightweight and normal weight concrete beams.