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钢筋混凝土超静定结构、在承受荷重的过程中,由于截面的塑性变形和刚度的变化,而引起了内力重分布的现象。考虑到达一现象、能够提高整个结构物的极限荷重,充分发挥结构物的潜力,同时能节约钢材,简化节点钢筋的布置,所以对内力重分布问题的研究,不但具有学术意义,而且还有较大的经济价值。钢筋混凝土材料并非完全塑性体,因此按完全塑性理论的计算,有时并不能得到正确的破坏荷重。本文将以反映材料弹塑性性质的 M—φ曲线为基础,分别考虑到塑性区出现前后的内力重分布情况,提出一个一般性的计算方法,使能反映结构物在弹塑性工作阶段的实际工作情况,和确定使用阶段的承载能力。根据这一计算方法,对一双跨连续梁进行了实际计算,计算结果和试验所得能较好地符合。
In the statically indeterminate structure of reinforced concrete, the redistribution of internal force is caused by the plastic deformation and stiffness of the cross section during the process of bearing the load. Taking into account a phenomenon that can increase the ultimate load of the entire structure, give full play to the potential of the structure, and at the same time save steel and simplify the arrangement of the steel bars, so the study of the redistribution of internal forces is not only of academic significance but also of comparison. Great economic value. Reinforced concrete materials are not completely plastomers. Therefore, according to the calculation of the complete plasticity theory, sometimes it is not possible to obtain the correct load. In this paper, based on the M-φ curve reflecting the elasto-plastic properties of materials, taking into account the redistribution of internal forces before and after the appearance of the plastic zone, a general calculation method is proposed to enable the actual work of the structure to be reflected in the elastoplastic stage. Situation, and determine the carrying capacity of the use phase. According to this calculation method, an actual calculation is performed for a double-span continuous beam, and the calculation results and test results are in good agreement.