数字化分布钢纤维增强水泥基复合材料方凳数值模拟研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (8): 2827-2834.

数字化分布钢纤维增强水泥基复合材料方凳数值模拟研究

慕儒, 范春豪, 王晓伟, 陈向上, 卿龙邦, 梅少林, 曹诚祥, 刘海洋

河北工业大学土木与交通学院,天津 300401

收稿日期:2024-01-09 修订日期:2024-03-07 出版日期:2024-08-15 发布日期:2024-08-12
作者简介:慕儒(1971—),男,博士,教授级高级工程师。主要从事纤维混凝土、超高性能混凝土及混凝土耐久性方面的研究。E-mail:ru_mu@hotmail.com
基金资助:
国家自然科学基金(52078180,52178199);河北省自然科学基金(E2023202062)

Numerical Simulation of Cementitious Composites Stool with Digitally Distributed Steel Fibers

MU Ru, FAN Chunhao, WANG Xiaowei, CHEN Xiangshang, QING Longbang, MEI Shaolin, CAO Chengxiang, LIU Haiyang

School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China

Received:2024-01-09 Revised:2024-03-07 Online:2024-08-15 Published:2024-08-12

摘要/Abstract

摘要： 掺入钢纤维可以改善水泥基复合材料的抗拉性能及韧性,通过主拉应力分布设计钢纤维方向及掺量,实现钢纤维数字化分布,能充分发挥钢纤维在基体中的增强作用。本文以方凳为研究对象,通过数值模拟建立了拉应力大小、方向和钢纤维分布的关系,确定了方凳中钢纤维的数字化分布,并进行了方凳控制截面受力性能分析。在方凳面板跨中截面处,数字化分布钢纤维分布数量分别比定向、随机分布钢纤维提高了187%、514%,钢纤维合力分别提高了276%、888%;在侧板上端正截面处,数字化分布钢纤维分布数量分别比定向、随机分布钢纤维提高了113%、355%,钢纤维合力分别提高了218%、775%。结果表明,与定向、随机分布钢纤维相比,数字化分布钢纤维增强作用明显提高,方凳面板跨中截面及侧板上端正截面处的钢纤维数量更多,钢纤维合力更高。

关键词: 数字化分布钢纤维, 水泥基复合材料, 数值模拟, 纤维应力, 增强机理

Abstract: The addition of steel fibers into cementitious composites can improve the tensile performance and toughness. The direction and volume fraction of steel fibers are designed according to the distribution of tensile stress, which is defined as digitally distributed steel fiber, and can maximize the reinforcement of steel fibers on cementitious composites. In this paper, a stool was chosen as case study. The relationship between the magnitude and direction of tensile stress with the distribution of steel fibers was established by numerical simulation, and the digitally distributed steel fibers in the stool were determined. The mechanical properties of critical cross-sections of the stool were analyzed. In the midspan of the top slab of the stool, the amount of digitally distributed steel fibers is 187% and 514% higher than that of aligned and randomly distributed steel fibers, and the resultant force undertaken by the digitally distributed steel fibers increases by 276% and 888%, respectively, compared to that by aligned and randomly distributed steel fibers. The amount of digitally distributed steel fibers is 113% and 355% higher than that of aligned and randomly distributed steel fibers in the top normal section of side slab of the stool, and the resultant force undertaken by the digitally distributed steel fibers increases by 218% and 775%, respectively, relative to that by aligned and randomly distributed steel fibers. The results show that the reinforcement effect of digitally distributed steel fibers is significantly improved compared with aligned and randomly distributed steel fibers, and the midspan cross-section of the top slab and the top normal section of side slab are characterized by an increasing number of steel fibers, which leads to a higher steel fiber resultant force.

Key words: digitally distributed steel fiber, cementitious composite, numerical simulation, fiber stress, reinforcement mechanism

中图分类号:

TU528

慕儒, 范春豪, 王晓伟, 陈向上, 卿龙邦, 梅少林, 曹诚祥, 刘海洋. 数字化分布钢纤维增强水泥基复合材料方凳数值模拟研究[J]. 硅酸盐通报, 2024, 43(8): 2827-2834.

MU Ru, FAN Chunhao, WANG Xiaowei, CHEN Xiangshang, QING Longbang, MEI Shaolin, CAO Chengxiang, LIU Haiyang. Numerical Simulation of Cementitious Composites Stool with Digitally Distributed Steel Fibers[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(8): 2827-2834.

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