Technical gazette, Vol. 27 No. 6, 2020.
Preliminary communication
https://doi.org/10.17559/TV-20190709112144
Reinforcement Calculation of Circular and Annular Cross Section
Yao Kaicheng
; Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, 727 South Jingming Road, Chenggong District, Kunming, Yunnan 650500, China
Zhou Donghua*
; Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, 727 South Jingming Road, Chenggong District, Kunming, Yunnan 650500, China
Shuang Chao
; Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, 727 South Jingming Road, Chenggong District, Kunming, Yunnan 650500, China
Lan Shuwei
; Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, 727 South Jingming Road, Chenggong District, Kunming, Yunnan 650500, China
Chen Jin
; Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, 727 South Jingming Road, Chenggong District, Kunming, Yunnan 650500, China
Abstract
Circular and annular cross-section is one of the more common cross-section forms, such as water towers, piers, etc. But reinforcement calculation of these crosssections is dual, the nonlinearity in width change and the nonlinear stress-strain relationship of concrete and reinforcement, which brings inconvenience to the calculation. In this paper, the corresponding calculation formulas are analytically derived and practical design charts (nomograms) are obtained. Based on stress-stain curve of concrete and reinforcement, five strain distribution regions were constructed. Via strains stress can be determined and then via the stress internal force can be computed, without application of the traditional equivalent rectangular stress block in concrete compression zone. The obtained dimensionless design charts can be applied to all load cases, such as uniform tension, tension with a small and large eccentricity, pure bending, compression with a large and small eccentricity and uniform compression. The calculation by using the design charts is simple and quick.
Keywords
axial and eccentric load; circular and annular cross-section; dimensionless design charts; reinforcement ring; strain region
Hrčak ID:
248253
URI
Publication date:
19.12.2020.
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