The Collapse Accident Analysis for Steel Structure of Waste-heat Boiler in a Cement Plant

By means of on-siteinvestigation, inspection,interior experiments, theoreticalanalysis and calculation, a detailed analysisis carried out on the causeof the partialcollapse accident about a waste-heat boiler steel structure in a cement plant of Hunan province of China. The resultsof inspectionand analysis show that: as a key part of load transfer, the connection weld of long thin steel plate is poor in quality, meanwhile, the detail of beam-column connection can not meet the requirement of rigid joint stipulated by the design, which are the main causes for the collapse accident of boiler steel structure. Based on the analysis of accident cause, some problems worthy of consideration are put forward to the design and constructionof this kind of structure, such asthe weld procedure and quality control of long thin steel plate connection weld, etc.

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