Development a Model to Estimate the Deformation of RC Members Considering the Interaction of Combined Forces

本文研究了钢筋混凝土柱和钢筋混凝土梁柱节点两种构件的受力性能。该方法的估计是基于塑性分析理论的一个一致的想法，考虑组合力的相互作用。虽然目前还没有一种更准确的方法来预测构件的延性，但是通过对构件的研究，发现了构件的一些重要性能。提出了考虑剪跨比、纵向配筋率和轴压的柱抗剪开裂承载力计算方法.研究表明，作者提出的考虑组合力相互作用的屈服线理论可以预测组合梁的抗剪承载力和破坏线坡度.结果表明，本文提出的屈服线理论公式（其中有效因子随转角的变化而减小）预测延性的精度与现有方法相同.研究结果表明：1.剪跨比对节点延性的预测精度有影响。提出了梁柱节点破坏的下沉机理.通过与文献中84个试件的对比分析表明，用下沉机制法估算强度的标准偏差小于现有方法。但对强度的略微高估也是可以接受的。试验中观察到梁柱连接失效时，连接梁向连接处下沉。当节点配箍率P_w为0.32%时，节点下沉量与节点临界截面裂缝宽度相当

The presenting research work shows the mechanical behavior estimation of two members, reinforced concrete column and reinforced concrete beam-column connection. The method for the estimation is based on a consistent idea of plastic analysis theory considering interaction of combined forces. Though a method to predict the ductility of members with better accuracy was not proposed, some important behaviors of those members were discovered.Conclusions of RC column are as follows:1. A method to estimate shear cracking strength of column is developed considering shear span ratio, longitudinal reinforcement ratio and axial load.2. It is shown that the lateral shear capacity and the gradient of failure line can be predicted by the yield line theory considering interaction of combined forces which has been proposed by the authors.3. It is shown that the accuracy of ductility prediction by the equations of yield line theory proposed by the authors, where the effectiveness factor is reduced according to rotation angle, is as same as the one of exiting method.4. The interaction between accuracy of ductility prediction and shear span ratio is observed.Conclusions of RC interior beam-column connection are as follows:1. Sinking mechanism of failure of beam-column connection has proposed.2. It is shown by comparison with 84 specimens in literature that standard deviation of strength estimation by the sinking mechanism method is smaller than an existing method. However overestimation of strength by a little is also observed.3. Sinking of connecting beam into connection is observed when beam-column connection failed in the test. The amount of sinking is as much as the crack width of connecting beam at critical section when hoop ratio p_w, of connection is about 0.32%