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本文用塑性理论计算矩形截面钢筋混凝土简支梁的极限剪切强度。视钢筋混凝土梁为理想刚塑性体,提出了矩形截面梁剪切破坏时的破坏机构,以该机构为基础,推导得出了理论计算公式。用该公式对国内外120根试验梁的计算结果表明与试验值符合良好。作者用18根梁的抗剪强度试验证实了该破坏模式的正确性。最后对理论公式进行了简化,给出了简单实用,计算精度高的抗剪强度计算式,可供修订规范时参考。
This paper uses the plasticity theory to calculate the ultimate shear strength of a simple reinforced concrete beam with rectangular section. Considering that the reinforced concrete beam is an ideal rigid-plastic body, the failure mechanism for the shear failure of the rectangular section beam is proposed. Based on this mechanism, the theoretical calculation formula is deduced. The calculation results of 120 test beams at home and abroad using this formula show that the test values are in good agreement with the experimental values. The shear strength test of 18 beams was used to verify the correctness of this failure mode. Finally, the theoretical formula is simplified, and a simple and practical calculation formula of shear strength is given, which can be used as reference for revision.