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进行了7个缩尺的小剪跨比钢筋混凝土独柱双支承桥墩模型试验研究。分析探讨了现有中国规范在计算钢筋混凝土独柱墩结构受弯裂缝宽度问题的适用性,给出了用于受弯裂缝宽度计算的修正钢筋名义拉应力计算公式。结合试验数据及回归分析结果,考虑混凝土抗剪强度、钢筋销栓作用、裂缝间骨料咬合作用、弯起钢筋及箍筋的竖向力分力等对抗剪的贡献,推导了剪切斜裂缝的裂缝宽度计算公式。计算结果表明:采用修正钢筋名义拉应力的独柱墩受弯裂缝计算公式的预测值与试验数据基本吻合,提出的斜裂缝宽度计算公式的预测值与参与对比的试验结果也十分接近,证实了该方法的合理性。
A seven-foot scale test of RCS pier with single-column and double-bearing pier was carried out. The applicability of the existing Chinese norms in calculating the width of flexural cracks in reinforced concrete single-column pier structures is analyzed and discussed. The formula for calculating the nominal tensile stress of modified steel bars is given for the calculation of flexural crack width. Based on the experimental data and regression analysis results, considering the contribution of shear strength of concrete, the function of steel bar pin, the bite of aggregate, the vertical force component of bent steel bar and stirrup on shear resistance, Crack width calculation formula. The calculated results show that the predicted value of the bending moment calculation formula of the single pier with the nominal tensile stress of the modified steel is in good agreement with the experimental data, and the predicted value of the calculated formula of the oblique crack width is very close to that of the comparative test. The rationality of this method.