During the renovation process of a certain factory building, significant deflection deformation occurred in the purlins. To identify the reasons for the deformation of the purlins and eliminate potential safety hazard...During the renovation process of a certain factory building, significant deflection deformation occurred in the purlins. To identify the reasons for the deformation of the purlins and eliminate potential safety hazards, a comprehensive structural inspection was carried out on this factory building, the inspection results indicate that the sectional dimension deviations of the measured steel components and the strength of the steel are in line with the design and code requirements. However, the mid-span deflections of some purlin components fail to meet the code requirements. The bearing capacity of the suspended loads under different working conditions was analyzed: Among the 9 hanging load working conditions of the purlins, the bearing capacity of the purlins in 4 working conditions did not meet the code requirements;among the 2 hanging load working conditions of the main frame, the bearing capacity of the frame beam components in 1 working condition did not meet the code requirements, and the deflections of the frame beams in both 2 working conditions did not meet the code requirements. In response to the above results, practical and feasible treatment suggestions were put forward.展开更多
This paper introduces a crack detection example of the prestressed box girder in a certain project. The morphology of the box girder cracks was surveyed and mapped. The length, width, and depth of the cracks were insp...This paper introduces a crack detection example of the prestressed box girder in a certain project. The morphology of the box girder cracks was surveyed and mapped. The length, width, and depth of the cracks were inspected, and the strength and reinforcement configuration of the components were tested. The test results indicate that the strength and reinforcement configuration of the inspected components meet the design requirements. The crack at the end of the top plate of the box girder is a local compressive crack at the anchorage end. The width and length of the crack on the bottom surface of the top plate are not significant, and the depth is relatively shallow. Judging from the crack morphology, this crack is identified as a temperature crack. Additionally, based on the treatment measures for cracks of different widths, the treatment measures for the cracks of the components in this project are derived, providing a reference basis for similar projects in the future.展开更多
This article takes the inspection and appraisal of a certain migratory wooden structure as the backdrop, presents the inspection process of the wooden structure. Upon on-site examination, it was discovered that the co...This article takes the inspection and appraisal of a certain migratory wooden structure as the backdrop, presents the inspection process of the wooden structure. Upon on-site examination, it was discovered that the connection (or node) construction mode of the building was correct. Only local surface flaws were present, and the operation was normal. The stress wave velocity of the randomly inspected wooden columns with surface cracking was close to the critical velocity, suggesting that no obvious cavities or decay defects existed within the measured wooden components. Based on the inspection outcomes, finite element computations were carried out for the wooden structure, arriving at the conclusion that the maximum stress value of the wooden members was smaller than the designed value of wood strength, and the vertical bearing capacity conformed to the requirements of the specifications. And rationally offered relevant treatment suggestions, providing a reference for the inspection and identification of such projects.展开更多
文摘During the renovation process of a certain factory building, significant deflection deformation occurred in the purlins. To identify the reasons for the deformation of the purlins and eliminate potential safety hazards, a comprehensive structural inspection was carried out on this factory building, the inspection results indicate that the sectional dimension deviations of the measured steel components and the strength of the steel are in line with the design and code requirements. However, the mid-span deflections of some purlin components fail to meet the code requirements. The bearing capacity of the suspended loads under different working conditions was analyzed: Among the 9 hanging load working conditions of the purlins, the bearing capacity of the purlins in 4 working conditions did not meet the code requirements;among the 2 hanging load working conditions of the main frame, the bearing capacity of the frame beam components in 1 working condition did not meet the code requirements, and the deflections of the frame beams in both 2 working conditions did not meet the code requirements. In response to the above results, practical and feasible treatment suggestions were put forward.
文摘This paper introduces a crack detection example of the prestressed box girder in a certain project. The morphology of the box girder cracks was surveyed and mapped. The length, width, and depth of the cracks were inspected, and the strength and reinforcement configuration of the components were tested. The test results indicate that the strength and reinforcement configuration of the inspected components meet the design requirements. The crack at the end of the top plate of the box girder is a local compressive crack at the anchorage end. The width and length of the crack on the bottom surface of the top plate are not significant, and the depth is relatively shallow. Judging from the crack morphology, this crack is identified as a temperature crack. Additionally, based on the treatment measures for cracks of different widths, the treatment measures for the cracks of the components in this project are derived, providing a reference basis for similar projects in the future.
文摘This article takes the inspection and appraisal of a certain migratory wooden structure as the backdrop, presents the inspection process of the wooden structure. Upon on-site examination, it was discovered that the connection (or node) construction mode of the building was correct. Only local surface flaws were present, and the operation was normal. The stress wave velocity of the randomly inspected wooden columns with surface cracking was close to the critical velocity, suggesting that no obvious cavities or decay defects existed within the measured wooden components. Based on the inspection outcomes, finite element computations were carried out for the wooden structure, arriving at the conclusion that the maximum stress value of the wooden members was smaller than the designed value of wood strength, and the vertical bearing capacity conformed to the requirements of the specifications. And rationally offered relevant treatment suggestions, providing a reference for the inspection and identification of such projects.
