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为了建立混凝土结构裂缝验算的统一公式,对28根钢筋混凝土梁进行试验,分析了配筋、保护层厚度和截面高度变化对钢筋重心水平对应的梁侧面的裂缝间距和裂缝宽度的影响规律;确定了结构设计中裂缝宽度验算对应的裂缝形态特征;提出了以纵向受拉钢筋直径和间距为变量的纵向受拉钢筋有效影响区的计算方法;改进了平均裂缝间距及最大裂缝宽度的计算模式,并将计算值与实测值进行了比较。结果表明:建议的公式精度较好,使最大裂缝宽度的计算更为合理,适用于大保护层和高截面的钢筋混凝土梁。
In order to establish a uniform formula for checking concrete structures, 28 reinforced concrete beams were tested. The influences of reinforcement, cover thickness and cross-section height on the crack spacing and crack width on the beam side corresponding to the center of gravity were analyzed. The fracture shape features corresponding to the crack width checking in the structural design were presented. The calculation method for the effective area of the longitudinal tensioned steel bars with the diameter and spacing of the longitudinal tensioned bars as variables was proposed. The calculation mode of the average crack spacing and the maximum crack width was improved, The calculated value is compared with the measured value. The results show that the proposed formula has better precision and the calculation of the maximum crack width is more reasonable, which is suitable for the large protective layer and the high-section reinforced concrete beam.