煤矸石混凝土梁弯矩-曲率关系的理论分析

IF 1.2 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Proceedings of the Institution of Civil Engineers-Structures and Buildings Pub Date : 2023-05-09 DOI:10.1680/jstbu.22.00066

B. Cai, Kaiyi Li, F. Fu

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引用次数: 0

摘要

目前，关于煤矸石混凝土在结构构件中的应用研究较少。为了研究钢纤维增强煤矸石混凝土梁的弯矩-曲率关系，提出了一种简化的计算方法。根据现行设计规范对方程进行了优化，包括抗弯刚度、裂缝宽度和间距、裂缝弯矩和极限弯矩的理论计算。将计算结果与试验结果进行对比，验证了梁的开裂弯矩和极限弯矩略低于天然混凝土梁。钢纤维的掺入提高了煤矸石混凝土梁的开裂弯矩、抗弯刚度和延性。提高配筋率也显著提高了承载力，但降低了延性。弯矩曲率计算值与试验值接近，证明了优化计算精度高，适用于钢纤维增强煤矸石混凝土梁的弯曲性能预测。本文为后续的相关研究提供了理论基础。

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Theoretical analysis of the moment-curvature relationship of coal gangue concrete beams

At present, there are only a few studies on the application of coal gangue concrete to structural components. To study the moment-curvature relationship of steel fibre-reinforced coal gangue concrete beams, a simplified calculation method was proposed in this study. The equations were optimised based on current design codes, including theoretical calculations of flexural stiffness, crack width and spacing, cracking moment and ultimate moment. Calculated results were compared with experimental results to verify that the cracking moment and ultimate moment of the beams were slightly lower than those of natural concrete beams. However, the cracking moment, flexural stiffness and ductility of coal gangue concrete beams was increased by incorporating steel fibres. Increasing the rebar ratio also significantly improved the load-carrying capacity but reduced ductility. The calculated values for moment-curvature were close to the experimental values, proving the optimised calculations have a high accuracy and are applicable to predicting the bending behaviour of steel-fibre-reinforced coal gangue concrete beams. This paper provides a theoretical basis for subsequent related research.

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来源期刊

Proceedings of the Institution of Civil Engineers-Structures and Buildings 工程技术-工程：土木

CiteScore

3.40

自引率

6.20%

发文量

审稿时长

12 months

期刊介绍： Structures and Buildings publishes peer-reviewed papers on the design and construction of civil engineering structures and the applied research associated with such activities. Topics include the design, strength, durability and behaviour of structural components and systems. Topics covered: energy conservation, people movement within and around buildings, strength and durability of steel and concrete structural components, and the behaviour of building and bridge components and systems