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王   宇¹  ,  吳亞敏²

( 1 .  濟南東鐵軌道交通建材有限公司 ， 山東 濟南 250000 ;    2.  鄭州工業應用技術學院 建筑工程學院 ，河南 新鄭 451100)

摘   要:為對高圍壓下再生混凝土進行細觀分析，在有限元軟件中應用改進的混凝土塑性損傷模型，通過 Python 建立五相隨機骨料模型，探究 3 、15 及 24 MPa 圍壓下不同再生粗骨料取代率時的混凝土應力－應變曲線 與損傷破壞形態。結果表明：該材料模型的準確度遠高于傳統模型，其應力－應變曲線發展趨勢及結果與試驗值基本相同，最大差距不超過10% ;  該方法能有效模擬混凝土在圍壓下的力學性能，低圍壓時混凝土的破壞裂縫較多，高圍壓時混凝土產生的初始裂縫較多，但最終只會形成 1 條破壞裂縫。

關鍵詞：再生混凝土 ；圍壓 ；細觀有限元 ；混凝土塑性損傷模型

中圖分類號：TU528 . 041           

文獻標志碼：A            

文章編號： 1005- 8249  (2024)  05- 0038- 05

DOI:10. 19860/j.cnki.issn1005 - 8249.2024.05 .008

 

WANG Yu¹  ,  WU Yamin²

( 1 . Ji ’nan East  Rail Transit Building Materials Co.，Ltd.，Ji ’nan 250000, China;

2. School of Architectural Engineering, Zhengzhou University of Industrial Technology ,

Xinzheng 451100, China)

Abstract: To perform a microscale analysis on recycled concrete under high confinement pressure, an improved concrete damage plasticity model was applied to finite element software. A five-phase random aggregate model was established using Python to investigate the stress-strain curve and damage failure morphology of concrete under 3, 15, and 24 MPa confinement pressures with different replacement rates of recycled coarse aggregates. The results show that the accuracy of this material model is much higher than that of traditional models, and its stress-strain curve development trend and results are basically the same as the experimental values, with a maximum difference of no more than 10%；This method can effectively simulate the mechanical properties of concrete under confinement pressure,when the confinement pressure is low, there are more failure cracks in the concrete. When the confinement pressure is high, there are more initial cracks in the concrete, but ultimately only one failure crack will form.

Keywords: recycled concrete; confining pressure; mesoscopic finite element; concrete damage plasticity model

作者簡介： 王    宇  (1975—) , 男，本科，高級工程師，研究方向：混凝土及新材料的研發與生產。

收稿日期：2023- 05- 15