scholarly journals Identification of three-dimensional defect topology in concrete structures based on self-attention network using hammering response data

JSIAM Letters ◽  
2021 ◽  
Vol 13 (0) ◽  
pp. 84-87
Author(s):  
Masaya Shimada ◽  
Takahiko Kurahashi ◽  
Yuki Murakami ◽  
Fujio Ikeda ◽  
Ikuo Ihara
Keyword(s):  
Three Dimensional ◽  
Concrete Structures ◽  
Attention Network ◽  
Response Data

scholarly journals A GPU-Based Parallel Procedure for Nonlinear Analysis of Complex Structures Using a Coupled FEM/DEM Approach

2013 ◽  
Vol 2013 ◽  
pp. 1-15 ◽  
Author(s):  
Lixiang Wang ◽  
Shihai Li ◽  
Guoxin Zhang ◽  
Zhaosong Ma ◽  
Lei Zhang
Keyword(s):  
Comparative Study ◽  
Computer Science ◽  
Nonlinear Analysis ◽  
Three Dimensional ◽  
Concrete Structures ◽  
Thermomechanical Analysis ◽  
Complex Structures ◽  
Large Structure ◽  
Performance Improvements ◽  
Parallelization Strategy

This study reports the GPU parallelization of complex three-dimensional software for nonlinear analysis of concrete structures. It focuses on coupled thermomechanical analysis of complex structures. A coupled FEM/DEM approach (CDEM) is given from a fundamental theoretical viewpoint. As the modeling of a large structure by means of FEM/DEM may lead to prohibitive computation times, a parallelization strategy is required. With the substantial development of computer science, a GPU-based parallel procedure is implemented. A comparative study between the GPU and CPU computation results is presented, and the runtimes and speedups are analyzed. The results show that dramatic performance improvements are gained from GPU parallelization.

Three-dimensional images generated from diffuse ultrasound wave: detections of multiple cracks in concrete structures

2019 ◽  
Vol 19 (1) ◽  
pp. 12-25 ◽  
Author(s):  
Hanyu Zhan ◽  
Hanwan Jiang ◽  
Ruinian Jiang
Keyword(s):  
Simultaneous Detection ◽  
Three Dimensional ◽  
Concrete Structures ◽  
Ultrasound Wave ◽  
Multiple Cracks ◽  
Scattering Media ◽  
Destructive Testing ◽  
Practical Applications ◽  
Sensitivity Kernel ◽  
Three Dimensional Images

The simultaneous detection of multiple defects in concrete structures is a task of pivotal importance for non-destructive testing and evaluation. Diffuse waves experiencing multiple scattering inside media are demonstrated to be sensitive to weak defects. Here, an analytic model is presented for diffuse wave decorrelation associated with sensitivity kernel that describes the time-of-flight distribution in strongly scattering environments. The model is then used for generating three-dimensional images that involve estimating perturbations at each localized position through an iterative, non-linear algorithm. With the consideration of loads and micro-cracks effects on diffuse waves, an application of the approach to a real-size concrete beam shows features that denote the positions and depths of multiple existing cracks. Extension of the approach to other strongly scattering media such as tissues and volcanos is straightforward. This study offers great potential for practical applications such as structural health monitoring, medical image generation, and seismic monitoring.

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