钢纤维再生混凝土梁受剪性能有限元分析
Finite element analysis of shear performance of steel fiber recycled concrete beam
苏静 1于桂欣 2栾开业1
作者信息
- 1. 山东建筑大学土木工程学院,济南 250101
- 2. 山东省水工环地质工程有限公司,济南 250014
- 折叠
摘要
为研究钢纤维再生混凝土梁的受剪性能,采用Abaqus软件对再生混凝土梁进行非线性有限元分析,并与实验结果进行对比,验证模型的可靠性.通过改变剪跨比、配箍率、钢纤维体积率和CFRP加固方式等参数,研究单调加载与单向反复加载2种加载方式下再生混凝土梁的受剪性能变化规律.结果表明,试件单向反复加载下的抗剪承载力和变形能力较单调加载下均有所降低,梁的脆性特征更为显著;增大配箍率、提高钢纤维体积率或采用CFRP加固等措施,均可以有效提升梁的受剪性能,且对试件反复加载受剪性能的改善效果更好;剪跨比是钢纤维再生混凝土梁斜截面受剪性能的重要影响因素,试件的抗剪承载力随剪跨比的增大而减小,试件变形能力增强.
Abstract
To study the shear performance of steel fiber reinforced recycled concrete beams,the recycled concrete beam is analyzed using nonlinear finite element analysis in Abaqus software.The analysis result is compared with the experiment result,and the reliability of the model is verified.By changing the parameters such as shear-span ratio,reinforcement ratio,steel fiber volume fraction,and CFRP reinforcement mode,the shear performance changes of recycled concrete beams under monotonic loading and unidirectional repeated loading is studied.The results show that:the shear bearing capacity and deformation capacity of the specimen under unidirectional repeated loading are both reduced compared to those under monotonic loading,and the brittle characteristics of the beam are more significant;increasing the reinforcement ratio,increasing the volume fraction of steel fibers,or using CFRP reinforcement can effectively improve the shear performance of the beam,and the improvement effect on the shear performance of the specimen under repeated loading is better;the shear-span ratio is an important influencing factor on the shear performance of steel fiber reinforced recycled concrete beams.The shear bearing capacity of the specimens decreases with the increase of the shear-span ratio,and its deformation ability increases.
关键词
再生混凝土/梁/剪切性能/钢纤维/CFRP/有限元Key words
recycled concrete/beam/shear performance/steel fiber/CFRP/finite element引用本文复制引用
基金项目
国家自然科学基金(52278507)
山东省自然科学基金(ZR2022ME160)
北京工业大学重点实验室校外开放课题(2020B03)
出版年
2024
NETL
NSTL
万方数据