斜拉索是斜拉桥的主要传力构件,索内高强钢丝腐蚀致使拉索承载性能退化,严重时将影响到大跨度斜拉桥的安全性和耐久性。为了精确高效地评估拉索承载性能,本文首先提出一种考虑腐蚀致使索内高强钢丝强度沿轴向和横截面方向随机分布的三维随机场模型来评估腐蚀斜拉索的剩余承载力。之后,采用某实桥的1号斜拉索和2号斜拉索的现场试验结果对本评估模型的有效性进行了验证,结果表明本评估模型可以准确地估算腐蚀拉索的承载性能,与试验误差小于5%。

Tires are one of the indispensable components of automobiles,and different automobiles have different requirements for tire performance.After the tire leaves the factory,the identifier on the tire is the only information for the owner to identify the type of tire.Therefore,character detection must be carried out on the tire before the tire leaves the factory to ensure the safety of consumers.because the Tire image has the characteristics of low contrast between characters and background,diverse text forms and high character density,so the traditional manual feature extraction method is difficult to meet the industrial application conditions of tire detection.Therefore,the character detection of tire manufacturers mainly relies on manual detection.In order to solve this problem,in this paper,Halcon’s deep learning object detection model is used to design a tire character detection system to realize automatic tire image character detection.

Electrical impedance Tomography (EIT) is a newly developed nondestructive testing technology in recent decades. It can reconstruct the internal image of the measured body according to the measured voltage obtained from the electrode array on the surface of the measured body. EIT has attracted wide attention from all walks of life because of its advantages such as non-damage and simple system. In this paper, the forward and inverse problems of EIT imaging as well as the hardware are introduced, including the advantages and disadvantages of the algorithm, the existing problems and the current research level, etc. At the same time, the factors affecting the imaging quality of each part are analyzed in detail. EIT has been applied in many directions, especially in the medical field, which has a high research value and significance. It is hoped that readers can have a certain understanding of the concept of EIT imaging and the overall process of image reconstruction through reading this article. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

Earthwork calculation occupies an important position in all aspects of engineering construction, and its calculation accuracy and efficiency will have a significant impact on engineering construction. This article analyzes and summarizes the calculation results of various methods and software used in calculating earthwork; points out the shortcomings of the existing earthwork calculation methods; discusses the future development direction of earthwork calculation, which requires not only high accuracy, but also Faster and smarter information feedback provides timely and effective reference and guidance for project construction.
© Published under licence by IOP Publishing Ltd.

In recent years, with the urgent need of the country to vigorously promote the transformation and upgrading of the construction industry and the modernization of the construction industry, it has been proposed to vigorously develop prefabricated buildings and increase the proportion of prefabricated buildings in new buildings. The prefabricated concrete building is a concrete structure with prefabricated components in the factory and processing and connection on the construction site. Because of its fast construction speed and good overall benefits, it is widely promoted. For prefabricated buildings, the key technology is the connection of structural nodes, and most of the component connections use concrete sleeve connections. The quality of the sleeve grouting material is very important. The basic formula of the grouting material leads to different and different mechanical properties. Conditions apply. This article starts with different sleeve grouting patents, summarizes different functions and characteristics, and provides a reference for the next development of sleeve grouting. © 2021 Trans Tech Publications Ltd, Switzerland.

Structural health monitoring technology is one of the effective means to ensure the reliability of the structure, it is of great significance to the subsequent operation and maintenance of the structure to detect and identify the deterioration and damage of the structure during the service period, and realize the early warning and dynamic evaluation of the structural safety. Under the background of the rapid development of computer and other information technology, BIM technology is increasingly used in the field of structural health monitoring because of its good coordination, simulation, optimization, visualization, and graphing characteristics. This paper expounds and analyzes the research and application of structural health monitoring technology, BIM technology and structural health monitoring system based on BIM technology, and points out the technical and application problems that need to be solved urgently in the development of this field.
© Published under licence by IOP Publishing Ltd.

The corrosion products, residual area and mechanical behaviors of artificially corroded high strength steel wires were tested, which was essential for inspection and evaluation of corroded cables in service. The corrosion products were analyzed by high resolution X-Ray Diffractometer and Environmental Scanning Electron Microscope. Three-dimensional scanning was applied to determine the change of the cross section of corroded wires along the axial direction of corroded wires. Static tensile and fatigue loading tests were also carried out. The degradation of the constitutive model parameters of corroded high strength wires were derived by regression analysis of the tested mechanical parameters and corresponding corrosion ratios. The results showed that the variability of sectional area along wire axis increased with the increase of corrosion ratio. The stress-strain curves showed that the ultimate stress decreased, the ultimate strain had great variability, and the strengthening stage of some corroded high strength steel wires was shortened or even disappeared. The ultimate strength of corroded wires were less than the standard strength of 1770MPa when the corrosion ratio was larger than 1.25%; the elongation was less than the Specification limit of 4% when the corrosion ratio was larger than 5.05%; the fatigue life was less than 2 million when the corrosion ratio was larger than 4.16%; while corrosion had little effects on the elastic modulus. The index for evaluation of corroded wires was refined for the Specification based on the above results. © 2021 Taylor & Francis Group, London.