Abstract

Moment redistribution in the RC continuous beams occurs due to the plastic behaviour. As a result, the values of the moments at the critical sections are different from the values of moments resulting from the elastic design. This may be useful for attaining more economic-reinforced concrete sections as well as decreasing the reinforcing amount at the sections with a rush of disrupting of the reinforcement, specifically the mid-supports sections. However, in different codes of design, the values of moment’s redistribution depend only on the ratio between the neutral axes to the effective depth (c/d). Also, they vary from 30% to 20%. Therefore, in this study, 103 specimens of two-span RC beams were extracted from the previous studies and used to reveal the fundamental parameters that affect the value of the coefficient of moment’s redistribution (β). Afterward, by regression analysis of the database, a new model was established to significantly predict the values of (β) . Finally, the proposed model was compared with the different design standards. It was found that besides the proposed model is more accurate, the proposed model considers several parameters which were neglected by design codes, showing their obvious impact on defining the value of (β).

摘要

由于塑性行为，RC 连续梁中的力矩重新分配发生。因此，关键部分的力矩值与弹性设计产生的力矩值不同。这可能有助于获得更经济的钢筋混凝土部分，以及减少钢筋中断的部分的钢筋数量，特别是中间支撑部分。然而，在不同的设计规范中，力矩重新分配的值仅取决于中性轴与有效深度之间的比率（c/d）。此外，它们从 30% 到 20% 不等。因此，在本研究中，从先前的研究中提取了 103 个双跨 RC 梁试件，用于揭示影响弯矩重新分配系数值的基本参数 (β）。之后，通过对数据库的回归分析，建立了一个新的模型来显着预测 ( β ) 的值。最后，将所提出的模型与不同的设计标准进行了比较。结果发现，除了所提出的模型更准确之外，所提出的模型还考虑了设计规范忽略的几个参数，显示出它们对定义 ( β ) 值的明显影响。