再生与原生混凝土结构构件统一设计理论的基础问题

肖建庄, 张凯建, 丁陶, 张青天, 肖绪文

工程（英文） ›› 2023, Vol. 29 ›› Issue (10) : 188-197.

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PDF(1954 KB)
工程（英文） ›› 2023, Vol. 29 ›› Issue (10) : 188-197. DOI: 10.1016/j.eng.2023.03.017
研究论文
Article

再生与原生混凝土结构构件统一设计理论的基础问题

作者信息 +

Fundamental Issues Towards Unified Design Theory of Recycled and Natural Aggregate Concrete Components

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History +

Highlight

• Compressive and tensile design strengths of RAC can be defined and determined similarly to those for NAC.

• Uniaxial compressive stress-strain relationship between NAC and RAC has a unified mathematical expression.

• Unified design methodology for NAC and RAC structural components is proposed considering safety and reliability.

摘要

再生混凝土作为一种低碳混凝土，成为近20年来国内外的研究热点，但是目前再生混凝土结构的设计仍是一个挑战。本文从原生与再生混凝土结构构件统一设计的新需求出发，剖析了两者统一设计的必要性，并从强度取值、受压本构关系以及结构构件设计方法等方面进行了深入论证。分析发现，再生混凝土的强度变异系数总体上高于原生混凝土，再生混凝土的抗压强度及抗拉强度代表值的定义和取值方法与原生混凝土一致；原生与再生混凝土的单轴受压本构关系具有统一的数学表达形式，但与原生混凝土相比，再生混凝土弹性模量降低、脆性增加。最后，提出了再生混凝土构件安全可靠度调整系数，实现了再生与原生混凝土构件承载力设计公式的统一，并从概念设计和构造措施上，论证了考虑时变强度与钢筋锈蚀等影响的时变可靠度统一的可行性。本文的工作，丰富和发展了混凝土结构基本理论。

Abstract

In the past 20 years, recycled aggregate concrete (RAC), as a type of low-carbon concrete, has become a worldwide focus of research. However, the design methodology for RAC structural components remains a challenge. Consequently, demands for a unified design of natural aggregate concrete (NAC) and RAC components have been presented. Accordingly, this study analyses the necessity of a unified design theory and provides an in-depth demonstration of the strength determination, compressive constitutive relationship, and design method of concrete components. The coefficient of variation of RAC strength is found to be generally higher than that of NAC strength. The compressive and tensile strengths of RAC can be defined and determined using the same method as that used for NAC. The uniaxial compressive constitutive relationship between NAC and RAC has a unified mathematical expression. However, the elastic modulus of RAC decreases, and its brittleness exhibits an increasing trend compared with that of NAC. Finally, to unify the design formulae of RAC and NAC components for bearing capacity, modification factors for RAC components are proposed considering safety and reliability. Additionally, the feasibility of the proposed unified time-dependent design theory is demonstrated in terms of conceptual design and structural measures considering the effects of strength degradation and reinforcement corrosion. It is believed that this study enriches and develops the basic theory of concrete structures.

关键词

再生混凝土 / 原生混凝土 / 强度取值 / 本构关系 / 可靠度 / 统一设计方法 /

Keywords

Recycled aggregate concrete (RAC) / Natural aggregate concrete (NAC) / Strength determination / Constitutive relation / Reliability / Unified design theory

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肖建庄, 张凯建, 丁陶. 再生与原生混凝土结构构件统一设计理论的基础问题. Engineering. 2023, 29(10): 188-197 https://doi.org/10.1016/j.eng.2023.03.017

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The authors wish to acknowledge the financial support from the Distinguished Young Scholars of China by the National Natural Science Foundation of China (51325802) and the National Natural Science Foundation of China (51178340, 52078358, and 52008304).

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