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对配筋方式与混凝土裂缝宽度关系进行了深入分析。通过建立钢筋混凝土分离式有限元模型,考虑它们之间的粘结滑移作用,分别改变构件的配筋率和钢筋直径,来考察混凝土裂缝宽度变化规律。可以得到这样的结论:在钢筋根数不变情况下,增大钢筋直径,配筋率相应增大,裂缝宽度会明显减小;在配筋率不变情况下,增大钢筋直径,裂缝宽度则会相应增大,并且文中将二者关系量化,该结论很好地解释了工程中经常选用细钢筋和较高配筋率来得到较好的限裂效果。依据新旧版本水工规范选用不同直径限裂钢筋,以闸墩竖直墙为模型,通过有限元分析阐述了新版规范对钢筋直径修改的意义。
The relationship between reinforcement method and concrete crack width is analyzed in depth. Through the establishment of the separation of reinforced concrete finite element model, considering the role of the bond between them slip, respectively, to change the component of the reinforcement ratio and diameter of reinforcement to examine the variation of concrete crack width. It can be concluded that in the same number of steel bars, increasing the diameter of steel bar, the reinforcement ratio increases, the width of the cracks will be significantly reduced; in the case of the same reinforcement ratio, increasing the diameter of steel, the width of the crack The corresponding increase will be made, and the relationship between the two will be quantified in the text. This conclusion well explains that the fine cracking effect is often obtained by using the fine steel bar and the high reinforcement ratio in the project. Based on the old and new versions of hydraulic codes, different diameters of cracked rebars were selected, and the pier vertical wall was taken as a model. The significance of the new code to modify the diameter of rebars was expounded by finite element analysis.