ABSTRACT

The elongation of beams in reinforced concrete frames due to flexural cracking and yielding is restrained by the surrounding structural components, thereby leading to axial force in the beams. To study the effects of beam axial restraint on the beam flexural and joint shear behaviors, cyclic lateral loading experiments were conducted on four beam-column substructures, two of which were restrained from beam elongation. The experiments indicated that the passively developed axial force significantly increases the beam flexural capacity. Moreover, the beam axial restraint increased shear demand on beam-column joints; as a result, joint shear failure occurred in one test specimen.

摘要

钢筋混凝土框架中的梁由于弯曲开裂和屈服而伸长受到周围结构构件的约束，从而导致梁中产生轴力。为了研究梁轴向约束对梁弯曲和节点剪切行为的影响，对四个梁柱子结构进行了循环横向加载实验，其中两个受到梁伸长的约束。实验表明，被动产生的轴向力显着增加了梁的抗弯能力。此外，梁的轴向约束增加了对梁柱节点的抗剪要求；结果，一个试件发生了接头剪切破坏。