钢筋混凝土框架顶层T型中节点抗剪强度计算模型

Caculated Modal for Shear Strength of T-shaped Interior Joints on RC Frame Top Layer

通过4个框架顶层T型中节点在低周反复循环荷载作用下的试验,调查了节点裂缝分布特征、抗剪强度、变形性能等抗震性能指标.结果表明:由于梁纵筋在节点内的黏结劣化以及节点箍筋约束效果的下降,T型节点抗剪强度与形状相同的框架中间层├型边节点相比平均降低15%以上.本研究对Hwang的STURT-TRUSS计算模型中的斜压杆机构高度、节点箍筋有效面积等关键解析参数进行了整合,建立了适合于T型节点抗剪强度的计算模型.计算结果与试验结果吻合.

Based on the experiment of four RC T-shaped interior joints on the top story of a building frame under statically cyclic loading, the indexes of the earthquake-resistant performance of the joints such as crack patterns, shear strength, deformation features etc. were investigated. The experimental results showed that the shear strength of T-shaped joints is 15% less than that of extrior joints due to the affect of beam bar bond deterioration in the joints and confined effect deterioration from joint shear bars. Based on the test data, the key analysis parameters for STURT-TRUSS model proposed by Hwang , such as the height of sturt and the effective areas of joint shear bars were improved, the caculated model for evacuating the shear strength of T-shaped joints was proposed. The results from the analysis agree well with the experimental data.