Failure Detection of Temporary Structures with Digital Image Correlation for Construction Safety Applications
Temporary structures refer systems and assemblies without a permanent foundation, which will be removed after a certain period of time. In the past decades there have been numerous significant collapses of temporary structures in United States. To ensure
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Failure Detection of Temporary Structures with Digital Image Correlation for Construction Safety Applications Shaowen Xu Abstract Temporary structures refer systems and assemblies without a permanent foundation, which will be removed after a certain period of time. In the past decades there have been numerous significant collapses of temporary structures in United States. To ensure structural stability and the safety, there is increasingly demand of developing an industry wide standard code, technology and procedure of temporary structure design, erecting, maintenance, monitoring and evaluation for practicing engineers and contractors. In this study, Digital Image Correlation was utilized for structure monitoring and failure detection of temporary structure during construction or loading period. The experimental results demonstrated the displacement measurement at the structural nodes could be used to determine the safety stage of the structure, predict the structural failure time and location. The aim of this research is to advance this state of the art measurement technology and facilitate a real-time automated monitoring and detection system for of structural failures of temporary structures. Keywords Structure monitoring • Failure detection • Digital image correlation • Construction safety • Temporary structure
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Introduction
Temporary structures are low cost assemblies and systems, without a permanent foundation, used for temporary supporting or bracing of permanent work during construction, or structures built for temporary use, such as temporary bracing, scaffolding, temporary or emergency shelters, temporary formwork and performance stage. In the past decades there have been significant numbers of collapses of temporary structures in the United States. Those accidents resulted in many deaths and injuries, as well as, huge financial lost [1–5]. Investigations indicated that many of those accidents related to improper design, erection and monitoring, as well as, unpredicted loading conditions. To ensure structural stability and safety, there is increasingly demand of developing an industry wide standard code, and technology of temporary structure design, erecting, monitoring and evaluation for practicing engineers and contractors. The performance status of a temporary structure could characterize in terms of stable, transition, and unstable stage. In stable stage the structure is considered reliable and safety. The structure would tend to recover back to its equilibrium state after any perturbation. After passing the “Instable Threshold” into transition stage, the structure will tend to deform away from its equilibrium state during loading process. When load further increasing, the structure will become unstable. Without any additional support, the structure would quickly switch into unstable stage, deform rapidly and collapse when it experiences any perturbation of load and external introduced displacement. The critical point between the transition and unstable stages is referred as Failure Point. Stru
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