CE5510 Advanced Structural Concrete Design

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Understand the behaviour of beams with openings under bending and shear !Design the opening using Mechanism Approach, Plasticity Truss Method or Strut-and-Tie Method !Detail the reinforcement to satisfy serviceability and ultimate limit states

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Nội dung Text: CE5510 Advanced Structural Concrete Design

CE5510 Advanced Structural Concrete Design - Design & Detailing of Openings in RC Flexural Members- Assoc Prof Tan Kiang Hwee Department of Civil Engineering National University of Singapore
DEPARTMENT OF CIVIL ENGINEERING In this lecture We will explore !Types of openings !Behaviour of beams with large openings !Design for ultimate strength !Crack Control !Deflection Calculation A/P Tan K H, NUS A/P Tan K H, NUS 2  Tan K H, NUS
DEPARTMENT OF CIVIL ENGINEERING At the end of the lecture You should be able to !Understand the behaviour of beams with openings under bending and shear !Design the opening using Mechanism Approach, Plasticity Truss Method or Strut-and-Tie Method !Detail the reinforcement to satisfy A/P Tan Kserviceability A/P Tan K H, NUS H, NUS and ultimate limit statesH, NUS 3  Tan K
National University of Singapore Beams with Openings: and Design. Mansur, M.A. and Kiang-Hwee Tan. CRC Press Ltd, 1999 © Tan KH NUS Page 4
DEPARTMENT OF CIVIL ENGINEERING Additional references ! Mansur, M.A., Tan, K.H. and Lee, S.L., "A Design Method for Reinforced Concrete Beams with Large Openings", Journal of the American Concrete Institute, Proceedings, Vol. 82, No. 4, USA, July/August 1985, pp. 517-524. ! Tan, K.H. and Mansur, M.A., "Design Procedure for Reinforced Concrete Beams with Web Openings", ACI Structural Journal, Vol. 93, No. 4, USA, July- August 1996, pp. 404-411. ! Mansur, M.A., Huang, L.M., Tan, K.H. and Lee, S.L., "Analysis and Design of R/C Beams with Large Web Openings", Journal of the Institution of Engineers, Singapore, Vol. 31, No. 4, July/August 1991, pp. 59-67. A/P Tan K H, NUS A/P Tan K H, NUS 5  Tan K H, NUS
National University of Singapore © Tan KH NUS Page 6
Opening in beam National University of Singapore © Tan KH NUS Page 7
National University of Singapore © Tan KH NUS Page 8
Classification of Openings National University " By geometry: of Singapore – Small opening if Depth or diameter ≤ 0.25 x beam depth and Length ≤ depth ≤d h d ≤ 0.25h ≤ 0.25h – Large opening otherwise. © Tan KH NUS Page 9
" By structural response: National University – Small opening if of Singapore Beam-type behaviour persists. – Large opening otherwise. © Tan KH NUS Page 10
National University of Singapore TS T2 © Tan KH NUS Page 11
National University of Singapore © Tan KH NUS Page 12
DESIGN TOOLS National University " Finite element analysis: of Singapore • elastic stress state • area of stress concentration " Truss analysis (Strut-and-tie model): • lower bound approach • detailing for crack control and strength " Tests: • specific cases © Tan KH • serviceability & strength aspects NUS Page 13
BEHAVIOUR of BEAMS WITH LARGE National University of OPENINGS Singapore © Tan KH NUS Page 14
National University of Singapore Principal tension stress contours © Tan KH NUS Page 15
National University of Singapore Mt +Mb + Nz = M =M Nt + Nb = 0 Vt + Vb = V © Tan KH NUS Page 16
National University of Singapore Inadequately reinforced openings © Tan KH NUS Page 17
actual National University of 1 2 Singapore idealised 1 2 3 4 3 4 © Tan KH NUS Page 18
National University of Singapore © Tan KH NUS Page 19
National University of Singapore © Tan KH NUS Page 20