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为了保证钢筋混凝土结构可靠地工作,纵向受力钢筋必须伸入按计算充分利用其抗拉强度的受力截面一定长度,以便借助于这个长度上的粘结力把钢筋锚固在混凝土中,该锚固长度 l_a 是决定纵向钢筋的截断延伸长度、纵向钢筋伸入支座及节点的锚固长度、纵向受拉钢筋的锚固长度和钢筋搭接长度的基准,即所谓受拉钢筋
In order to ensure the reliable operation of the reinforced concrete structure, the longitudinal force-reinforced steel bar must extend into a certain length of the force-receiving section which makes full use of its tensile strength so as to anchor the steel bar in the concrete by means of the adhesive force of this length. The length l_a is the benchmark that determines the truncated extension length of the longitudinal reinforcement, the anchorage length of the longitudinal reinforcement into the bearing and the joint, the anchoring length of the longitudinal tensioned reinforcement, and the length of the reinforcement lap, the so-called tensile reinforcement.