基于gprMax的混凝土结构多相三维复杂建模与仿真  

Multi-phase 3D complex modeling and simulation of concrete structures based on gprMax

作　　者：葛娅 刘宁[1] GE Ya;LIU Ning(School of civil engineering,Jilin Jianzhu university,Changchun 130118,China)

机构地区：[1]吉林建筑大学土木工程学院,长春130118

出　　处：《吉林建筑大学学报》2024年第6期20-25,31,共7页Journal of Jilin Jianzhu University

基　　金：吉林省科技厅国际科技合作项目(20240402065GH).

摘　　要：混凝土作为典型的复合材料,其物理特性由粗骨料和硬化水泥砂浆的成分、性质、配比等决定。在混凝土材料相关的探地雷达数值模拟中,需要从其微/细观角度来把握混凝土材料的宏观物理性质。gprMax基于时域有限差分(FDTD)算法能够实现复杂目标体的电磁仿真模拟。本文构建了混凝土结构三维复杂模型,利用Python语言在模型中定义了粗、细骨料等材料的属性和体积含量等,使混凝土不再作为单一的均质材料,而是由具有不同介电常数的材料随机组成的多相体系。数值建模分析混凝土梁并通过试验验证,结果表明:提出的三维复杂模型在有限差分时域仿真中表现良好,能够更准确地反映混凝土的实际物理特性,在探地雷达方法有效应用于结构无损检测研究领域有积极的作用。The physical properties of concrete,as a typical composite material,are dependent on the composition,characteristics,and ratio of coarse aggregate and hardened cement mortar.In numerical simulations of GPR related to concrete materials,it is essential to comprehend the macroscopic physical properties from a micro/micro perspective.gprMax enables electromagnetic simulation of complex targets using the finite difference time domain(FDTD)algorithm.This paper constructs a three-dimensional complex model for concrete structures where Python is utilized to define the properties and volume content of coarse and fine aggregates along with other materials in the model.Consequently,concrete transforms from being a single homogeneous material into a multiphase system randomly composed of materials with varying dielectric constants.Meanwhile,the concrete beams were analyzed using numerical modeling and verified through experiments.The results show that the proposed three-dimensional complex model exhibits good accuracy and reliability in finite-difference time-domain simulation,which can reflect the actual physical properties of concrete more accurately,and has a positive role in applying the ground-penetrating radar method to the field of structural nondestructive testing research.

关 键 词：探地雷达 混凝土结构 FDTD算法 三维复杂模型 gprMax 

分 类 号：TU375.1[建筑科学—结构工程]