Browse > Article
http://dx.doi.org/10.7781/kjoss.2017.29.3.237

Structural Strength of Beam-to-CFT Connections with Vertical Diaphragm  

Kim, Kyungtae (Chang Minwoo Structural Consultants)
Lee, Heon-Woo (Chang Minwoo Structural Consultants)
Kim, Young-Ki (EG Partner)
Kim, Taejin (Chang Minwoo Structural Consultants)
Kim, Jong-Ho (Chang Minwoo Structural Consultants)
Publication Information
Journal of Korean Society of Steel Construction / v.29, no.3, 2017 , pp. 237-247 More about this Journal
Abstract
This paper investigates structural characteristics of internal vertical diaphragm and its influence on the connection strength between concrete filled tubular(CFT) column and beam. CFT columns are hybrids that combine two materials in one member. They have the benefits of steel for high tensile strength and ductility and of concrete for high compressive strength and stiffness. Analytical method of the flexural strength of vertical diaphragm to account moment transfer between panel zones is presented using yield line theory. Connection design is verified by a set of monotonic tests and numerical analysis with different diaphragm thicknesses. Plastic zones of CFT flange was found and matched closely to FEM results. Both analytical and experimental results showed good agreement that vertical diaphragm effectively alleviates the stress and transfer the force.
Keywords
CFT column; Vertical diaphragm; Structural strength; Weld; Plastic analysis;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 Chung, J., Seo, S., Matsui, C. and Choi, S. (2005) Hysteresis Behavior of Square Tube Columns to H-Beam Connections with Vertical Stiffeners, Advances in Structural Engineering, Vol.8, No.6, pp.561-571.   DOI
2 Fukumoto T, Morita K. (2005) Elastoplastic behavior of panel zone in steel beam-to-concrete filled steel tube column moment connections. Journal of Structural Engineering, ASCE, Vol.131, No.12, pp.1841-1853.   DOI
3 Kawano A, Matsui C, Murai N. (1998) Load-deformation relationship models for local deformations in diaphragmstiffened connections of H-shaped steel beams to rectangular CFT columns. Steel Construction Engineering, Vol.5, No.17, pp.93-104.
4 Lu. X.L, Yu, Y., Kiyoshi, T., and Satoshi, S. (2000) Experimental study on the seismic behavior in the connection between CFRT column and steel beam. Structural Engineering and Mechanics, Vol. 9, No.4, pp.365-374.   DOI
5 Morita, K., Fu, G., Teraoka, M., and Yokoyama, Y. (1995) Experimental study on connections with eccentricity between concrete filled square tubular steel column and steel beam. Proceedings of the 4th Pacific Structural Steel Conference, Vol.2. UK: Pergamon; pp.25-32.
6 Sasaki, S., Teraoka, M., Morita, K., and Fujiwara, T. (1995) Structural behavior of concrete-filled square tubular column with partial-penetration weld corner seam to steel H-beam connections, Proceeding of the 4th Pacific Structural Steel Conference, Vol.2. UK: Pergamon; pp.33-40.
7 Al-Rodan, A.K. (2004) T-Cleat Connections to Concrete- Filled Tubular Internal Columns, Journal of Structural Engineering, Vol.130, No.5, pp.725-731.   DOI
8 Choi, S., Lee, S., Hong, S., and Kim, J. (2009) Structural capacities of tension side for CFT square column-to-beam connections with combined-cross diaphragm, Advances in Structural Engineering, Vol.11, No.2, pp.209-227.   DOI
9 Kang, C.H., Shin, K.J., Oh, Y.S., and Moon, T.S. (2001) Hysteresis behavior of CFT column to H-beam connections with external T-stiffeners and penetrated elements, Engineering Structures, Vol.23, No.9, pp.1194-1201.   DOI
10 Park, J.W., Kang, S.M. and Yang, S.C., (2005) Experimental Studies of Wide Flange Beam to Square Concrete-Filled Tube Column Joints with Stiffening Plates around the Column, Journal of Structural Engineering, ASCE, Vol.131, pp.1866-1876.   DOI
11 Shin, K.J., Kim, Y.J., Oh, Y.S. and Moon, T.S. (2004) Behavior of Welded CFT Column to H-beam Connections with External Stiffeners, Engineering Structures, Vol.26, No.13, pp.1877-1887.   DOI
12 서성연, 정진안, 최성모, 김성용(2005) 외측 다이아프램을 사용한 현장 용접형 각형강관기둥 , 한국강구조학회논문집, 한국강구조학회, Vol.17, No.4, pp.459-467. Seo, S.Y., Jung, J.A., Choi, S.M., and Kim, S.Y. (2005) Seismic Behavior of H Shaped Beam to Square Column Connection with Outer Diaphragm Using Field Welding, Journal of Korean Society of Steel Construction, KSSC, Vol.17, No.4, pp.459-467 (in Korean).
13 이성희, 김영호, 최성모(2016) 용접조립 각형 CFT 기둥-보외다이아프램 접합부의 구조 거동, 한국강구조학회논문집, 한국강구조학회, Vol.28, No.2, pp.75-83. Lee, S.H., Kim, Y.H., and Choi, S.M. (2016) Structural Behavior of Welded Built-up Square CFT Column to Beam Connections with External Diaphragm, Journal of Korean Society of Steel Construction, KSSC, Vol.28, No.2, pp.75-83. (in Korean).
14 Huang, B.S., Du, P.Y., and Fan, J.H. (2007) Nonlinear Analysis on Connection with Outer Diaphragms between Square Concrete Filled Steel Tube Columns and Steel Beams, Journal of Harbin Institute of Technology, Vol.39, pp.455-458.
15 Qin, Y., Chen, Z., and Wang, X. (2014) Experimental investigation of new internal-diaphragm connections to CFT columns under cyclic loading, Journal of Constructional Steel Research, Vol.98, pp.35-44.   DOI
16 Matsui, C. (1985) Strength and Behavior of Frames with Concrete Filled Square Steel Tubular Columns under Earthquake Loading, Proceedings of the International Specialty Conference on Concrete Filled Tubular Structures, Harbin, China, August, pp.104-111.
17 이성희, 정헌모, 양일승, 최성모(2009) 내부유공판을 사용한 각형 CFT 기둥-보 단순인장 접합부의 실험적 연구, 한국강구조학회논문집, 한국강구조학회, Vol.21, No.6, pp.575- 583. Lee, S.H., Jung, H.M., Yang, I.S., and Choi, S.M. (2009) An Experimental Study on Simple Tension Connections for Square CFT Column to Beam Using Internal Plate with Holes, Journal of Korean Society of Steel Construction, KSSC, Vol. 21, No.6, pp.575-583 (in Korean).
18 Cao, J.J., Packer, J.A., and Yang, G.J. (1998) Yield line analysis of RHS connections with axial loads, Journal of Constructional Steel Research, Vol.48, pp.1-25.   DOI
19 Nie, J., Qin, K., and Cai, C.S. (2009) Seismic behavior of composite connections-flexural capacity analysis, Journal of Constructional Steel Research, Vol.65, pp.1112-1120.   DOI
20 Qin, Y, Chen, Z., and Wang, X. (2014) Elastoplastic behaviour of through diaphragm connections to concrete filled rectangular steel tubular columns, Journal of Constructional Steel Research, Vol.93, pp.88-96.   DOI
21 Korean Building Code 2016.
22 AISC (1997) Specification for the Design of Steel Hollow Structural Sections, American Institute of Steel Construction, Chicago.
23 European Committee for Standardisation, Eurocode 3: Design of Steel Structures. Part 1.1-General rules and rules for buildings. (1992) ENV 1993-1-1:1992E, British Standards Institution, London, UK.
24 Bazant, Z.P. and Oh, B.H. (1983) Crack band theory for fracture of concrete, Materials and Structures, Vol.16, pp.155-177.
25 Hillerborg, A., Modeer, M., and Petersson, P.E. (1976) Analysis of Crack Formation and Crack Growth in Concrete by Means of Fracture Mechanics and Finite Elements, Cement and Concrete Research, Vol.6, pp.773-782.   DOI
26 Bazant, Z.P., and Yu, Q. (2011) Size effect testing of cohesive fracture parameters and non-uniqueness of workof- fracture method, Journal of Engineering Mechanics, ASCE, Vol.137, No.8, pp.580-588.   DOI
27 Jirasek, M. and Bazant, Z.P. (2001) Inelastic Analysis of Structures, Wiley.