Abstract:Fiber Bragg grating strain sensors have the problem of cross-influence between temperature and strain during measurement, and temperature has a significant impact on stress measurement results. To obtain accurate stress measurement results, it is necessary to significantly reduce or eliminate the impact of temperature. Currently, the reference grating method or temperature measurement coefficient correction method is difficult to obtain ideal results. This paper proposes to use a cross-sectionally symmetrical cantilever beam structure as a sensitive element, using the principle of opposite strain and temperature change on the upper and lower surfaces of the cantilever beam, and symmetrically pasting two fiber Bragg gratings on the upper and lower surfaces of the cantilever beam, using the result difference to eliminate the temperature effect and improve the measurement sensitivity. This paper studies the sensing performance of this new type of temperature self-compensated fiber Bragg grating strain sensor, and installs this type of sensor on the anchor of the cable for cable force measurement. The research results show that the developed fiber Bragg grating strain sensor can significantly reduce the impact of temperature and achieve the purpose of temperature self-compensation; using this type of sensor for cable force measurement has high accuracy and sensitivity, which can meet the practical needs of engineering applications.

Abstract:The large deflection angle of the cable of the third Bosphorus Strait bridge in Turkey requires the design of a locator to protect the cable body. This paper designs the material selection and structure of the locator, and verifies the performance of the locator through theoretical calculations and ANSYS analysis, and its protective effect on the cable body.

Abstract:Through extensive literature research and extensive engineering surveys, the recent development status of new geotechnical anchors (cables) at home and abroad is comprehensively discussed from six aspects, namely, new geotechnical anchors (cables) used for underground engineering support, urban foundation pit reinforcement, corrosion geological engineering reinforcement, soft soil layer engineering reinforcement, underground cavern explosion resistance, and slope earthquake disaster management. On this basis, the main problems still existing in the development of anchors (cables) are analyzed, and the important work that needs to be further carried out in the future is pointed out, including strengthening the research and development of yield-type anchors (cables) for deep underground engineering support problems, strengthening the research and development of non-metallic anchors (cables) for durability problems of anchoring projects, strengthening the research and development of recovery anchors (cables) for urban foundation pit engineering reinforcement problems, strengthening the research and development of expansion-type anchors (cables) for soft soil layer engineering reinforcement problems, and strengthening the research and development of new explosion-proof anchors (cables) for underground cavern anchoring explosion-proof problems.

Abstract:This paper introduces the experimental and research results of the adhesion (referred to as grip force in the text) of a single steel wire (hot-cast anchor) and alloy per unit area. The paper mainly introduces the production of single steel wire hot-cast anchors, test methods, and factors affecting the grip force of single steel wires.

Abstract:The application of conventional beamforming technology to acoustic emission source localization is progressing. This paper realizes one-time localization of acoustic emission sources based on beamforming network array technology, and uses the control variable method to explore the effects of sensor network type, number of sensors, wave speed, and sound source position on localization.

Abstract:In prestressed components, the prestress loss of ultra-long spatial curved beams is usually large, and the existence of construction errors will increase the prestress loss and reduce the effective prestress, which usually has an adverse effect on the structure. Therefore, in the analysis of prestressed structures, it is necessary to consider the influence of construction errors, measure the prestress loss of ultra-long spatial curved beams, and revise the relevant coefficients for calculating prestress loss to examine the impact of actual prestress loss on the bridge structure. This paper takes the bottom plate through-length beam of a continuous beam bridge as an example, determines the value of the friction coefficient that has the greatest impact on prestress loss through field measurement of steel strand stress and theoretical analysis, and then revises the structural finite element model based on this to study the impact of prestress loss caused by construction errors on the bridge structure.

Abstract:Introducing the use of synchronous hydraulic control system technology to achieve the overall lifting and sliding installation process of large tonnage steel structure modules, discussing the principle of hydraulic lifting control, and focusing on the key design methods and construction points of the installation process. Engineering practice has shown that the successful use of hydraulic synchronous control system technology for the overall lifting and sliding of large tonnage steel structure modules in one go has improved construction progress and engineering quality, achieving significant technical and economic benefits. Summarizing the aspects that need to be improved and paid attention to in the construction practice of the installation process, providing a reference for similar large tonnage overall installation projects.