Ultimate Strength of R/C Wall Girder-Column Joint with Eccentricity

从试验结果和基于有限元法的三维非线性分析结果出发，讨论了具有偏侧偏心的墙-梁-柱组合和梁-柱组合的受力特性。从试验结果和分析结果可以得出以下结论：1偏心梁柱组合在不考虑偏心的情况下按节理受剪破坏设计，其破坏模式为扭转破坏，即柱受扭剪双重作用。节点配筋量和柱纵向配筋量对扭剪联合作用下柱的极限强度没有影响。扭剪联合作用下柱的极限强度预测公式与试验数据基本吻合，但与柱的计算方法相同的节点破坏准则方程不能对偏心节点的极限强度进行预测，因为节点的纯扭扭强度无法计算。2本文提出的柱抗剪强度方程给出了无偏心情况下墙-柱节点抗剪强度的预测。3对于偏心较小的梁-柱节点，扭剪联合作用下节点极限强度的预测公式与试验数据吻合较好，且考虑有效截面的假设，可以估计节点的极限强度。4对于偏心的梁-柱节点，三维非线性分析结果表明，节点的扭转角大于柱的扭转角。节理的最大压应力产生于靠近墙梁一侧，大部分剪应力在靠近墙梁的节理区域承担。

The mechanical behavior of wall girder-column subassemblages and beam-column subassemblages with one-sided eccentricity is discussed from the experimental results and the results of three-dimensional nonlinear analysis based on Finite Element Method. The following conclusions are obtained from the test results and the results of analysis : 1 The failure mode of girder-column subassemblages with eccentricity, which are designed so that joint should failed in shear in no consideration of eccentricity, was torsional failure is column subjected to torsion and shear. The amount of joint reinforcement and that of column longitudinal reinforcement did not have an influence on ultimate strength of a column in combined torsion and shear. The equation for predicting the ultimate strength of columns in combined torsion and shear approximately gives an agreement with the test data, but a failure criteria equation for the joint used in the same way as for the column does not give a prediction of-the ultimate strength of joints with eccentricity, because pure torsional strength of joints can not be calculated. 2 The proposed equation for the shear strength of column gives a prediction of the shear strength of wall girder-column joint without eccentricity. 3 In the case of beam-column joints with a small eccentricity, the equation for predicting the ultimate strength of joints under combined torsion and shear gives an agreement with the test data, And also the ultimate strength of joints can be estimated by considering the assumption of effective section' 4 In the case of wall girder-column joint with eccentricity, the results of three-dimensional nonlinear analysis indicate that torsional angle in joint is larger than that in column, The maximum compressive stress in joint is generated in side near the wall girder, and most of the joint shear stress is carried, in joint area near the wall girder.