钢筋绑扎搭接长度（Banding length of reinforcement）.docVIP

钢筋绑扎搭接长度（Banding length of reinforcement） The mechanism of reinforced banding lap steel bar anchorage, that two reinforced each anchor in concrete. It is regarded as a kind of continuous. However, because of the overlapping section of reinforced contact contact surface, lack of concrete package, a part of lack of grip. Researchers consider that through research and practice, in the standard application, introduced a more than a correction coefficient multiplied by the anchorage length compensation, as banding lap length. So, banding lap length = anchorage length * correction coefficient. The longitudinal tensile reinforcement minimum lap length The type of reinforced concrete strength C15 C20 C20 C35 = C40 ~ C25 Light garden reinforced HPB (I) 45d 35d 30d 25d Ribbed reinforced HRB (II)HRB400 (III), RRB400 (III) - 55D 40d 35d level Note 1: joints area. This form is applicable to longitudinal tensile reinforcement is not greater than 25%; When the joints between the percentage ranged from 25% to 50%, the values in the table by a factor of 1.2 for; When the percentage of joints area is greater than 50%, the values in the table by a factor of 1.35 for; When the bond length minimum lap length of two different diameter, the smaller the diameter of the steel calculation; Note 2: when the ribbed bar diameter more than 25 mm, the minimum overlap should be according to the corresponding value multiplied by coefficient of 1.1 for; The epoxy coated ribbed steel bars, the minimum lap should be multiplied by the coefficient of 1.25 with the corresponding numerical; In the concrete solidification process is susceptible to disturbance (such as the use of sliding formwork and climbing formwork etc.), the minimum overlap should be according to the corresponding value multiplied by coefficient of 1.1 for; At the end of the mechanical anchoring measures of ribbed bar, the minimum overlap value multiplied by a coefficient of 0.7 according to the corresponding access; When the