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장승필(Sung Pil Chang),조서경(Seo Kyung Cho),김제춘(Je Choon Kim),변형균(Hyung Kyun Byun) 한국강구조학회 1994 韓國鋼構造學會誌 Vol.6 No.2
This paper presents a construction error control system to improve the construction accuracy of composite cable stayed bridges constructed by the free cantilever method. In cantilever method structural system changes according to the progress in construction. Then errors may be accumulated and amplified through complicated construction steps. Even if the section dimensions are controlled within the specification allowance limit, cable force and girder deflection will have errors far exceeding the allowance limits. Although the design is accurate and correct construction is done, a certain amount of errors in cable tension and geometry is inevitable. Thus, the feedback process of measurement and adjustment is required for more accurate construction. The error control system consists of the processes of measurement, construction stage analysis, error factor estimation, prediction and optimum adjustment. In the analysis system composite action of concrete slab and steel girder evaluated by the proposed stiffness matrix. Output results are accumulated for each load increment. Also, various construction commands are defined to simulate complicated construction procedure. The optimum adjustment system can reduce overall errors evenly to avoid undesirable distortion and overstress. The optimum adjustment system can reduce overall errors evenly to avoid undesirable distortion and overstress. The error factor estimation and prediction system can calculate the quantitive value of error factors and show behavior of structures at later steps. Adjustments can be possible based on final step information. The proposed system can provide tools for adjustment and cable adjustment base applications.