鋼筋混凝土偏移柱行為與設計

Behavior and Design of Reinforced Concrete Walking Columns

鄭國雄(Hermawan Sutejo)

指導教授 ： 歐昱辰

國立臺灣大學/工學院/土木工程學研究所/碩士(2020年)

https://doi.org/10.6342/NTU202002850

摘要

None

關鍵字

None

並列摘要

Walking columns with nine different aspect ratios from 1:9 to 1:1 were tested. The walking columns were designed using ACI 318-19 column design method or later mentioned as pier method and strut-and-tie method for each aspect ratio. Hence, eighteen models were tested in total. The compressive strength of concrete material was 8000 psi and the reinforcement yield strength was 60,000 psi for all aspect ratios. The width of all walking columns were 12 in. in compliance with the dimension of the upper and lower column which was 12 in. x 12 in. At the same time, finite element models were built in ATENA nonlinear finite element analysis (FEA) software for all aspect ratios and both design methods. All models were subject to downward deflection incrementally applied on the upper column until its failure. The main objective was to know which design method was the most appropriate for designing reinforced concrete walking column element. The finite element method results show that strut-and-tie method can be conservatively used for design of all aspect ratios. However, for slender walking columns, strut-and-tie design is too conservative and therefore wastes reinforcement materials. The test results indicate that for aspect ratio of 1:9 to 1:4, the axial strength of walking column designed using pier method is lower than the axial strength obtained from FEA. Therefore, pier method can be used as the design method so that more reinforcement materials can be saved. However, for aspect ratio of 1:3 to 1:1 the pier method analysis results in increasing trend while the FEA shows decreasing trend in axial strength. For these slender walking columns, strut-and-tie method can more accurately capture the axial behavior. It confirms ACI 318-19 code Table R18 which categorizes the aspect ratio of 1:1 to be wall and 1:2 to 1:3 to be wall pier and the rest to be pier.

並列關鍵字

walking column ； column ； pier ； strut-and-tie ； behavior ； design ； axial capacity

參考文獻

ACI 318-19 (2019). "Building Code Requirements for Structural Concrete ACI 318-19." American Concrete Institute, Farmington Hills, MI.

BS 8110-1:1997 (1997). “Structural use of concrete – Part 1: Code of practice for design and construction”. British Standard Institution, London, United Kingdom.

CEB-FIP (1970). “International recommendations for the design and construction of concrete structures - Appendix 3: deep beams (English ed.), Cement and Concrete Association, London, United Kingdom.

Portland Cement Association (1946). “Concrete Information ST66: design of deep girders”, Chicago.

EN 1992-1-1 (1992). “Eurocode 2: Design of concrete structures – Part 1-1: General rules and rules for buildings. European Committee for Standardization, Brussels.