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一、钢筋的锚固(一)钢筋的锚固长度1. 基本公式图1为一钢筋的脱离体,钢筋上作用的力为(?),钢筋表面的粘结应力设为μ,锚固长度设为l_d,则由力的平衡方程,可得: (?) 令f_s达到f_y,则(?) 式中,d_b为钢筋的直径。根据50年代末,60年代初所做的试验,可得μ的数值随钢筋直径的大小、是受拉还是受压以及是否设置在构件的顶部而有不同的数值,见表1。
1. Anchorage of steel bars (1) Anchorage length of steel bars 1. Basic formula Figure 1 shows the debonded body of a steel bar. The force acting on the steel bar is (?), the bond stress on the steel bar surface is set to μ, and the anchorage length is set to l_d. , from the balance equation of force, can be: (?) Let f_s reach f_y, then (?) Where, d_b is the diameter of the bar. According to the tests conducted in the late 50’s and early 60’s, the value of μ can be different depending on the size of the bar diameter, whether it is pulled or pressed and whether it is set on the top of the component.