反复荷载作用下梁结构倾斜截面承载力的确定方法

Yu. A. Somina, V. Karpiuk, A. Kostiuk
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引用次数: 0

摘要

对我们自己的试验结果和其他科学家的研究结果的分析表明,重复荷载作用下的结构破坏发生在较低的应力下,而不是在短期静荷载作用下的结构破坏。也就是说,在循环荷载作用下,梁的承载力比其“孪生体”在静力作用下的承载力平均低10%,这在结构计算和设计时必须考虑到。为此,本文提出了低周和多周荷载作用下钢筋混凝土梁结构倾斜截面的计算方法。建议在计算梁的材料疲劳强度时考虑重复荷载,即临界斜裂缝上方的混凝土压缩区、与斜裂缝相交处的纵向钢筋以及纵向钢筋的锚固作用。特别是考虑了混凝土和钢筋的耐久性设计线。在实际计算中,由于受压混凝土在复杂应力状态下振变变形的发展而引起的应力变化是通过混凝土应力积累、纵向和横向钢筋的作用来考虑的。根据振徐变理论计算了混凝土振徐变的变形函数。根据研究结果,推导并给出了相应的表达式和依赖关系,用于确定给定剪跨下结构单元的极限力。此外,还建议在计算中引入kcyc系数,考虑到多周期载荷比低周期重复载荷更具破坏性的影响。因此,kcyc是试件梁近支撑截面的破坏剪力与最小设计极限耐久力之比,采用混凝土和钢筋强度的特征值,即混凝土的棱柱强度和钢筋的屈服强度计算。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
AUTHOR'S METHOD FOR DETERMINING THE BEARING CAPACITY OF INCLINED SECTIONS OF BEAM STRUCTURES UNDER REPEATED LOADS
Analysis of the results of both our own tests and studies of other scientists shows that the destruction of structures under the action of repeated loading occurs at lower stresses than the destruction of structures under the action of short-term static loads. Namely, the bearing capacity of beams under the action of cyclic loads is on average 10% lower compared to the bearing capacity of their "twins" under static forces, that must be taken into account when calculating and designing structures. In this regard, the author's method for calculating inclined sections of reinforced concrete beam structures under low-cycle and multi-cycle loads is presented in the paper. Repeated loads are proposed to be taken into account by calculating the fatigue strengths of the beam’s materials, namely the compressed zone of concrete above the critical inclined crack, the longitudinal reinforcement at the intersection with the inclined crack, as well as the anchoring of the longitudinal reinforcement. In particular, the design lines of endurance of concrete and reinforcement are considered. In practical calculations, the change in stresses that occurs due to the development of vibrocreep deformations of compressed concrete at complex stress state is taken into account by the functions of stress accumulation in concrete, longitudinal and transverse reinforcement. These functions of deformations of concrete vibrocreep are calculated according to the theory of vibrocreep. According to the results of the research, the corresponding author's expressions and dependencies are derived and presented, which allow determining the limit forces of structural element with a given shear span. In addition, it is proposed to introduce the coefficient kcyc into the calculation, which takes into account the more destructive effect of a multi-cycle load compared to a low-cycle repeated one. Thus, kcyc is the ratio of the breaking shear force to the minimum design ultimate endurance force of the near support sections of the specimens-beams, calculated using the characteristic values of the strength of concrete and reinforcement, that is, the prismatic strength of concrete and the yield strength of reinforcement.
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