基于颗粒流对混凝土尺寸效应下的抗压裂缝分析

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (10): 3554-3561.

基于颗粒流对混凝土尺寸效应下的抗压裂缝分析

李玉成¹, 代金鹏^1,2, 王起才^1,2

1.兰州交通大学甘肃省道路桥梁与地下工程重点实验室,兰州 730070;
2.兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室,兰州 730070

收稿日期:2023-05-24 修订日期:2023-07-05 出版日期:2023-10-15 发布日期:2023-10-17
通信作者: 代金鹏,博士,副研究员。E-mail:daijp@seu.edu.cn
作者简介:李玉成(1997—),男,硕士研究生。主要从事土木工程材料方面的研究。E-mail:554940229@qq.com
基金资助:
国家自然科学基金(51768033,51808272);甘肃省青年科技基金(21JR7RA330);甘肃省青年科技人才托举工程项目(GXH20210611-10);兰州交通大学“天佑青年托举人才计划”基金;嘉峪关市科技计划项目(21-09);甘肃省引导科技创新发展专项-重点研发能力提升项目(2019ZX-09)

Analysis of Compressive Crack in Concrete under Size Effect Based on Particle Flow Code

LI Yucheng¹, DAI Jinpeng^1,2, WANG Qicai^1,2

1. Key Laboratory of Road and Bridge and Underground Engineering of Gansu Province, Lanzhou Jiaotong University, Lanzhou 730070, China;
2. Bridge Engineering National Local Joint Engineering Laboratory of Disaster Prevention and Control Technology, Lanzhou Jiaotong University, Lanzhou 730070, China

Received:2023-05-24 Revised:2023-07-05 Online:2023-10-15 Published:2023-10-17

摘要/Abstract

摘要： 基于颗粒流(PFC)的Fish语言编写了二维颗粒流程序,构建了二维混凝土细观模型,采用标定后的PB模型参数,对不同尺寸混凝土的破坏裂纹演化和破坏机理进行分析。模拟结果表明:混凝土单轴抗压破坏是水泥砂浆界面以及骨料与水泥砂浆交界面裂纹扩张和演化造成的;不同的尺寸以及随机骨料的分布会对混凝土的峰值应力和破坏模式有一定的影响;单轴抗压试件内的裂纹起始于水泥砂浆界面,随后以骨料与水泥砂浆的交界面为主开始延伸,并随着载荷增加向混凝土内部发展,到90%峰值抗压强度后,裂纹的延伸速度和增加速度进入突增阶段,主裂纹和水泥砂浆界面的次生裂纹相互作用,呈现出贯穿状,使混凝土试件破坏;随混凝土尺寸的增大和骨料数量增加,裂缝数量增加,且随混凝土尺寸的减小,裂纹突增的速度与数量比例更大。

关键词: 混凝土, 颗粒流, 尺寸效应, 细观裂纹, 单轴抗压破坏, 随机骨料分布

Abstract: A two-dimensional particle flow program based on the Fish language of particle flow code (PFC) was compiled to construct a two-dimensional concrete fine-view model, and the calibrated PB model parameters were used to analyse the damage crack evolution and damage mechanism of concrete with different sizes. The results of the simulations show that the uniaxial compressive failure of concrete is caused by the expansion and evolution of cracks at the cement mortar interface and at the intersection of aggregate and cement mortar.Different sizes and random distribution of aggregates have certain influences on the peak stress and failure mode of concrete. Cracks in uniaxial compression specimens initiate at the interface between cement mortar and aggregate, and then propagate primarily along the interface between aggregate and cement mortar. As the load increases, cracks extend into the interior of the concrete. After reaching 90% of the peak compressive strength, the extension and increase speed of cracks enter a sudden increase stage. The interaction between the main crack and secondary cracks at the interface between cement mortar cause the concrete specimens to fail in a perforated manner. As the size of concrete and the quantity of aggregates increase, the number of cracks also increases. Moreover, with the decrease of concrete size, the ratio of sudden crack increase speed and crack quantity become larger.

Key words: concrete, particle flow code, size effect, microscopic crack, uniaxial compression failure, random aggregate distribution

中图分类号:

TU528

李玉成, 代金鹏, 王起才. 基于颗粒流对混凝土尺寸效应下的抗压裂缝分析[J]. 硅酸盐通报, 2023, 42(10): 3554-3561.

LI Yucheng, DAI Jinpeng, WANG Qicai. Analysis of Compressive Crack in Concrete under Size Effect Based on Particle Flow Code[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(10): 3554-3561.

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