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Shear Strength of Lightweight Concrete Beams with Stirrups Near Code Minimum

机译：接近规范最小值的带箍筋的轻质混凝土梁的抗剪强度

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The new ACI 318-02 provision for minimum shear reinforcement, Equation (11-13), is based on tests of normal weight concrete beams. The evaluation of experimental data supported the code change making minimum shear reinforcement a runction of the concrete cylinder strength. However, it also indicated that caution should be exercised when extrapolating current code minimums to beams with concrete cylinder strengths above 13 ksi (90 MPa). Because of the paucity of data on the shear strength of higher strength lightweight concrete beams with stirrups near code minimum values, the performance of this type of member is experimentally evaluated in this paper. The program consisted of four prestressed concrete beams, two specimens contained no stirups, and two had stirrups near the code minimum. The specimens failed at shear capacities above calculated values. In the beams without stirrups, a 44% increase of the concrete cylinder strength resulted in a 28% increase of the measured shear strength. However, in the specimens with shear reinforcement (PC6S and PCI OS), a 56% increase of the concrete cylinder strength only resulted in a 3% increase of the measured shear strength. The findings from the experimental program indicate that the current code minimum stirrups for lightweight concrete beams should be re-examined. The requirement results in a lower amount of minimum stirrups for higher strength lightweight concretes in comparison to the minimum amount required for an otherwise identical normal-weight concrete beam.
机译：ACI 318-02中有关最小抗剪钢筋的新规定（方程式（11-13））基于正常重量混凝土梁的测试。实验数据的评估支持代码更改，从而使最小的剪切钢筋成为混凝土圆柱体强度的基础。但是，它也表明，当将当前代码最小值外推到具有13 ksi（90 MPa）以上的混凝土圆柱体强度的梁时，应格外小心。由于缺乏强度高的轻型混凝土梁的强度，其箍筋的抗剪强度接近规范最小值，因此本文对这种类型的构件的性能进行了实验评估。该程序由四个预应力混凝土梁组成，两个标本不包含任何箍筋，而两个标本接近标准最小值。样品的剪切能力高于计算值时失败。在没有箍筋的梁中，混凝土圆柱强度增加了44％，导致测量的抗剪强度增加了28％。但是，在带有抗剪钢筋的试样（PC6S和PCI OS）中，混凝土圆柱体强度增加56％只会使测量的抗剪强度增加3％。实验程序的发现表明，应重新检查当前规范的轻质混凝土梁的最小箍筋。与其他重量相同的普通重量混凝土梁所需的最小数量相比，该要求导致强度较高的轻质混凝土的最小箍筋数量更少。

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