【摘要】 首先从梁柱端部转动变形能力与需求的比值角度对节点屈服机制进行了研究。结果表明,梁柱节点屈服机制是由梁柱纵向钢筋的相对强度、截面相对刚度和截面相对强度(包括配筋率、轴压比等)三个因素共同控制的。其次,分别对纵向钢筋的相对强度、截面相对强度和相对抗弯模量等三个因素进行了数值分析,结果表明,对于给定的梁柱节点,在满足现行规范关于梁柱配筋上下限和柱轴压比限值规定的前提下,严格控制柱截面尺寸下限值是实现梁铰机制的关键。最后,根据各影响因素值域的计算结果给出了不同抗震等级梁铰机制[R_W]限值的推荐方案。更多还原

【Abstract】 Firstly, the yield mechanism of RC frame beam-column joint is studied from the perspective of the ratio of the rotating deformation capacity and deformation demand of the component end, and the results show that the joint yield mechanism is controlled by three factors, namely, the relative strength of longitudinal reinforcements, the relative stiffness(including the modulus of section W) and the relative strength(including the reinforcement ratio, axial compression ratio, etc.)of beam and column sections. Secondly, numerical analyses are carried out for the strength ratio of longitudinal reinforcements, the strength ratio and the bending modulus ratio of beam and column sections, and the results show that,for the beam-column joint given, under the conditions of meeting the provisions of current standard about the upper and lower limits of reinforcement ration of membersand the axial compression ratio limit of columns, to strictly control the lower limit value of column sections is the key to realize the beam hinge mechanism. Finally, according to the numerical calculation results of the above influencing factors, the recommended limit values of [R_W], to realize beam hinge mechanism, are given for the seismic design of frame beam-column joints with different seismic grade.更多还原