INFLUENCE OF STEEL FIBERS AND COMPRESSION REINFORCEMENT ON DEFLECTION OF HIGH-STRENGTH CONCRETE BEAMS
INFLUENCE OF STEEL FIBERS AND COMPRESSION REINFORCEMENT ON DEFLECTION OF HIGH-STRENGTH CONCRETE BEAMS
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钢纤维和受压钢筋对高强混凝土梁挠度的影响
DOI：
10.14359/9721
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
F. Wafa
中科院分区：
文献类型：
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作者：
S. Ashour;K. Mahmood;F. Wafa
本文对高强混凝土梁的短期挠度和长期挠度进行了试验和理论研究。对12根抗压强度为85 Mpa(12,300 psi)的梁进行了拉压钢筋和钢纤维的试验。试验结果表明，纤维的加入增加了梁的抗弯刚度，从而减小了持续使用荷载作用下的瞬时挠度和长期挠度。在无纤维梁中，可以观察到受压钢筋在控制长期挠度方面的有益效果。然而，对于有钢纤维和受压钢筋的梁，其性能取决于这两种钢筋的数量，它们的过量可能会对长期挠度产生不利影响。提出了纤维混凝土梁有效转动惯量的计算方法，并建议对ACI规范中的长期系数进行修正，以考虑纤维和高强混凝土的影响。
The paper presents an experimental and theoretical study on immediate and long-term deflections of high-strength concrete beams. Twelve beams with 85 MPa (12,300 psi) compressive strength and having tension and compression rebars and steel fibers were tested. The experimental results show that the addition of fibers increases the flexural rigidity of the beams, thus reducing the immediate and total long-term deflections under sustained service load. The beneficial effect of the compression reinforcement in controlling the long-term deflection is observed in beams without fibers. However, for beams having steel fibers and compression reinforcement, the behavior depends on the amount of the two types of reinforcement, and their excessive amount may have an inauspicious effect on the long-term deflection. A method is presented for computing the effective moment of inertia of fibrous concrete beams, and a modification is suggested to the long-term multiplier of the ACI Code to include the effect of fibers and high-strength concrete.