加气混凝土复合材料跳线的应力应变状态研究

L. Suleymanova, A. Obaydi, P. Amelin, T. H. Mohammedali
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摘要

在本文中,作者研究了加气混凝土砌块与钢筋棒和外部复合钢筋制成的复合跳线在弯曲工作时的应力-应变状态。通过在加气混凝土体的纵向和横向插入钢筋对跳线进行杆件加固。复合加固是在整个构件宽度的拉伸边缘使用碳纤维带,以及在加气混凝土块垂直接缝处或构件中心的翼缘板上使用部分碳纤维带。通过比较加气混凝土弯曲跳线的正常截面强度和变形能力、碳纤维带和加气混凝土的胶合效果以及各种加固材料的最佳使用,对试验结果进行了评估。研究证实,在荷载不超过破坏荷载 60% 的情况下,外部复合配筋会因抗弯刚度的增加而降低加气混凝土受弯构件的变形能力;在荷载超过 60% 的情况下,外部复合配筋会因设计方案的改变而降低变形能力。带有杆状配筋的跃层具有脆性破坏特性,而带有外部复合配筋的跃层则会发生塑性破坏。一般来说,采用外部复合材料加固的复合加气混凝土跃层的承载能力足以承受运行荷载
本文章由计算机程序翻译,如有差异,请以英文原文为准。
RESEARCH OF STRESS-STRAIN STATE OF JUMPERS OF AERATED CONCRETE COMPOSITES
In this paper, the authors study the stress-strain state of composite jumpers made of aerated concrete blocks with steel reinforcement rods and external composite reinforcement when working in bending. Rod reinforcement of jumpers is carried out by inserting steel reinforcing bars into the body of aerated concrete in the longitudinal and transverse directions. Composite reinforcement is performed with carbon fiber tapes in the stretched edge of the element over the entire width, as well as parts of tapes on the flange sides of the aerated concrete block at the vertical seam or in the center of the element. The test results are assessed by comparing the strength of the normal section and the deformability of aerated concrete bending jumpers, the effectiveness of gluing carbon fiber tapes and aerated concrete, and the optimal use of various types of reinforcement. It has been established that external composite reinforcement at a load of up to 60% of the breaking load reduces the deformability of aerated concrete bending elements due to an increase in flexural rigidity, and at a load of more than 60% due to a change in the design scheme. Jumpers with rod reinforcement have a brittle nature of destruction, while those with external composite reinforcement fail plastically. In general, the load-bearing capacity of composite aerated concrete jumpers reinforced with external composite reinforcement is sufficient to withstand operational loads
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