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根据10个梁高不等钢筋混凝土框架中节点试件在低周反复荷载作用下的试验结果,分析变梁中节点的破坏过程和破坏特点,重点研究左右梁高差对该类非常规节点抗震性能的影响。结果表明:左右梁高差变化对变梁中节点抗震性能影响显著,随着左右梁高差增大,梁柱组合体的剪力逐渐增大至峰值后不断降低;当左右梁高差大于1倍柱验算截面高度时,组合体宜按中间层边节点分析。在试验研究的基础上,根据节点区左、右梁高差变化与框架柱截面高度的相对关系,将钢筋混凝土框架变梁中节点划分为两类,并提出计算两类变梁节点特性的建议公式。
According to the test results of 10 specimens with different heights in RC frames under low cyclic load, the failure process and failure characteristics of the joints in the beam were analyzed. The difference between the left and right beams’ The impact of performance. The results show that the variation of the left and right beam height has a significant effect on the seismic performance of the joints in the beam. With the increase of the height difference of the left and right beams, the shear force of the beam and column assembly gradually increases to the peak value and then decreases. Double column check section height, the composite body edge node should be analyzed according to the middle. Based on the experimental study, according to the relative relationship between the height difference between the left and right beams and the height of the frame column, the nodes in the RC beam are divided into two categories, and the suggestions for calculating the characteristics of the two types of beam nodes are proposed formula.