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本文敘述了我們于1957年2月至7月用电測系統和机械測量系統所进行的鋼筋混凝土梁在剪力作用下的抗裂性、强度及刚度的試驗結果,着重討論了抗裂性問題,給出了梁在剪力作用下斜裂缝出現的計算公式:Q_T=0.8bh_OR_p(1-0.1×M/Qh_O)(1-Rp/85)+50F_a,并将我們試驗的結果及国外試驗的結果跟上述公式的計算結果作了比較,平均相差为±5％。因此,可以认为这个公式是比較滿意的。 此外,还研究了斜裂缝出現时和破坏时的纵向鋼筋、箍筋及斜鋼筋的应力情况,梁中纵向鋼筋錨定程度对梁的抗剪强度的影响,斜裂縫出现后对梁的刚度的影响等問題。
This paper describes the test results of crack resistance, strength and stiffness of reinforced concrete beams under shear force performed by electric and mechanical measurement systems from February to July 1957. The problem of crack resistance is mainly discussed. The formula for the occurrence of oblique cracks under the effect of shear force is given: Q_T=0.8bh_OR_p(1-0.1xM/Qh_O)(1-Rp/85)+50F_a, and the results of our experiments and foreign tests The results are compared with the results of the above formula, and the average difference is ±5%. Therefore, this formula can be considered satisfactory. In addition, the stress of longitudinal steel bars, stirrup bars, and oblique steel bars during and after the occurrence of oblique cracks was studied. The effect of longitudinal steel bar anchorage on the shear strength of the beams and the stiffness of the beams after the occurrence of oblique cracks were also studied. Impact and other issues.