基于分段步进式弹塑性格构模型的混凝土破坏过程细观模拟  

Fracture Modelling of Concrete at Meso-scale Using Piece-wise Based Elastic-Plastic Lattice Model

作　　者：张洪智 金祖权[3] 姜能栋 葛智 Erik Schlangen 凌一峰 Branko Savija 王铮 ZHANG Hongzhi;JIN Zuquan;JIANG Nengdong;GE Zhi;Erik Schlangen;LING Yifeng;Branko avija;WANG Zheng(School of Qilu Transportation,Shandong University,Jinan 250100,China;Suzhou Research Institute,Shandong University,Suzhou 215021,Jiangsu,China;School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,Shandong,China;Faculty of Civil Engineering and Geosciences,Delft University of Technology,Delft 2628 CN,the Netherlands;Shandong Hi-speed Company Limited,Jinan 250100,China)

机构地区：[1]山东大学齐鲁交通学院,济南250100 [2]山东大学苏州研究院,江苏苏州215021 [3]青岛理工大学土木工程学院,山东青岛266033 [4]代尔夫特理工大学土木工程与地球科学学院,荷兰代尔夫特市2628 CN [5]山东高速股份有限公司,济南250100

出　　处：《材料导报》2023年第8期51-57,共7页Materials Reports

基　　金：山东省泰山学者青年基准纯水泥专家计划(tsqn201909032);国家自然科学基金(52008234,51978387);江苏省自然科学基金(BK20200235)。

摘　　要：经典格构模型理论假设单元服从完全脆性的线弹性本构关系,忽略了砂浆基体的延性,导致预测的混凝土荷载-位移曲线延性不足。针对该问题,基于分段步进式方法描述砂浆单元弹塑性本构关系,通过序列线性理论模拟试件受荷损伤破坏过程及力学响应。基于混凝土单轴拉伸和压缩试验对模型进行了校验,发现该模拟方法可以精确模拟混凝土的开裂及荷载-位移曲线。同时,该模型可用于模拟混凝土受拉开裂的尺寸效应问题,以及受压破坏时受力端横向约束程度和试件长细比对开裂行为的影响,为研究混凝土的断裂行为提供了新的理论方法和途径。The classically lattice model assumes the local elements behave elastic brittle,neglecting the ductility of the mortar matrix.This leads to the simulated load-displacement response more brittle than the realistic.To solve the aforementioned issue,a piece-wise approach was introduced to describe the elastic-plastic constitutive relation of lattice element.The fracture process and the load-displacement response were obtained through the sequentially-linear solution approach.The model was calibrated using the uniaxial tension and compression tests.It is found that the model can precisely simulate the fracture process and load-displacement response.Moreover,the model was used to model the size effect in uniaxial tension and the influence of the specimen’s slenderness and boundary confinement on the fracture behavior under compression.It offers a new theoretical method and approach for studying the fracture of concrete.

关 键 词：混凝土 细观尺度 格构模型 断裂过程 弹塑性本构关系 

分 类 号：TU528[建筑科学—建筑技术科学]