圆截面钢筋混凝土结构受弯曲扭转作用下的变形模型及计算算法

V. Travush, V. Kolchunov, S. Bulkin, M. Protchenko
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引用次数: 0

摘要

尽管国内外对钢筋混凝土的复杂阻力问题进行了相当长的研究,并发表了大量的论文,但现有的计算模型仍然很不完善。对于非矩形截面的结构尤其如此。本文提出了一种圆形截面钢筋混凝土结构受弯曲扭转的解析计算模型和算法,最充分地反映了这类结构的受力特点。该模型考虑了圆形截面杆单元的所有外力分量,裂缝的空间性质,弯矩的联合作用,压缩混凝土区域位置的各种情况,取决于计算结构中作用力的比例。对于空间裂缝,计算截面采用对角大小椭圆和以凹凸空间抛物线为界的空间曲面的形式。在压缩和拉伸混凝土中,考虑三个部分的破碎部分,其中两个部分以纵向梯形的形式存在,第三个中间部分以与结构纵轴成一定角度旋转的小椭圆的形式存在。获得的分析相关性允许人们确定相互关联的设计参数,例如压缩区混凝土的应力,压缩混凝土的高度,纵向和横向钢筋的应力,混凝土和钢筋的变形,空间倾斜裂缝的投影长度等。该变形模型和算法可用于圆形和环形截面的钢筋混凝土结构的弯曲和扭转设计。
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DEFORMATION MODEL AND ALGORITHM FOR CALCULATION OF REINFORCED CONCRETE STRUCTURES OF ROUND CROSS-SECTION UNDER TORSION WITH BENDING
Despite a fairly long period of research and a significant number of publications around the world on the problem of the complex resistance of reinforced concrete, the existing calculation models still remain far from perfect. This is especially true for structures with a non-rectangular cross section. The article presents a version of the model and an algorithm for the analytical calculation of reinforced concrete structures of a circular cross section in torsion with bending, which most fully reflects the specifics of the power resistance of such structures. The model takes into account all the components of external forces in a rod element of a circular cross section, the spatial nature of cracks, with the combined action of moments, various cases of the location of the compressed concrete zone, depending on the ratio of the acting forces in the calculated structure. For a spatial crack, calculated sections are taken in the form of diagonal large and small ellipses and a spatial surface bounded by concave and convex spatial parabolas. In compressed and stretched concrete, a broken section of three sections is considered, two in the form of longitudinal trapezoid and the third, middle section in the form of a small ellipse rotated at an angle to the longitudinal axis of the structure. The obtained analytical dependencies allow one to determine interconnected design parameters, such as stresses in the concrete of the compressed zone, the height of the compressed concrete, stresses in the longitudinal and transverse reinforcement, deformations in concrete and reinforcement, the length of the projection of a spatial inclined crack, and others. The deformation model and algorithm can be used in the design of reinforced concrete structures of circular and annular cross-section, working in bending with torsion.
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CiteScore
0.80
自引率
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发文量
43
审稿时长
4 weeks
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