Basis of Design, a case study building
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1 Basis of Design, a case study building Luís Simões da Silva Department of Civil Engineering University of Coimbra
2 Contents Definitions and basis of design Global analysis Structural modeling Structural analysis Case study: building Classification of cross sections
3 Case study building Cardington Building, UK Total area of 21 m by 45 m and total height of 33 m (8 storeys). 5 bays, each 9 m long by 3 bays of 6 m, 9 m and 6 m. The height of the first storey is m from the ground floor to the top-of-steel height. All the other storeys have a height of m from top-of-steel to top-ofsteel. 4 A C E A B C D E F 6.00 m 2b 2a m 2.50 m 2.00 m 6.00 m m 4.50 m 4.50 m 4.00 m Building master example (Cardington - UK)
4 Global Analysis: case study building Geometric Characteristics of Steel Members Geometric characteristics of the beams (1 st floor) Geometric characteristics of the beams (2 nd floor) Geometric characteristics of the beams (3 rd to 8 th floors) Geometric characteristics of the columns
5 Global Analysis: case study building General safety criteria, actions and combinations of actions SLS E d 7 = 1.00 x LC x (LC2 + LC3). E d 8 = 1.00 x LC x LC4. E d 9 = 1.00 x LC x LC5. E d 10 = 1.00 x LC x LC x (LC2 + LC3). E d 11 = 1.00 x LC x LC x (LC2 + LC3) E d 12 = LC x (LC2 + LC3). E d 13 = LC x LC x (LC2 + LC3) E d 14 = LC x LC x (LC2 + LC3) ULS i) Combination 1 E d 1 = 1.35 x LC [(LC2 + LC3) x LC4] ii) Combination 2 E d 2 = 1.35 x LC [(LC2 + LC3) x LC5] iii) Combination 3 E d 3 = 1.00 x LC x LC4 iv) Combination 4 E d 4 = 1.00 x LC x LC5 v) Combination 5 E d 5 = 1.35 x LC [LC x (LC2 + LC3)] vi) Combination 6 E d 6 = 1.35 x LC [LC x (LC2 + LC3)]
6 Global Analysis: case study building Structural analysis Linear elastic analysis Susceptibility to 2 nd order effects: elastic critical loads 2 nd order elastic analysis For combinations 1, 2, 5 and 6 the values of cr are smaller than 10. According to clause 5.2.1, the frame requires a second-order analysis for load combinations 1, 2, 5 and 6.
7 Global Analysis: case study building Results for Beam E1 to E4 (4th floor, combination 1) kn The internal forces (neglecting the axial 75.9 kn 75.2 kn force) are represented in the figure. The V z,ed design values are M Ed = knm and 70.7 kn 71.6 kn V Ed = 75.9 kn knm knm kn knm knm 99.2 knm knm M y,ed knm knm knm
8 Global Analysis: case study building Results for column E1 (combination 1) z y 65.5 knm 201 kn 53.0 kn 72.3 knm 29.8 knm 417 kn 41.1 kn 58.6 knm 32.0 knm 630 kn 41.1 kn 57.1 knm 29.3 knm 841 kn 40.2 kn 55.9 knm 27.9 knm 1053 kn 39.3 kn 53.8 knm 29.0 knm Design values are: N Ed = 1704 kn; M y,ed =24.8kNm 1262 kn 43.2 kn 68.6 knm 54.5 knm at the base cross section kn 50.5 kn 73.5 knm 10.6 knm 1704 kn 29.4 kn 24.8 knm N Ed V z,ed M y,ed
9 Classification of cross sections Class 1: plastic cross-sections Class 2: compact cross-sections Class 3: semi-compact crosssections Class 4: slender cross-sections M M pl M el Class 4 Class 3 Class 2 Class 1 s
10 Classification of cross sections M Rd M pl M el Plastic global analysis Elastic global analysis discontinuity Class 2 Class 1 Class 3 Class 4 c/t M pl M el M eff Semi-Comp, Guimarães 2011
11 Classification of cross sections Cross section classification is required for: Selection of the global frame analysis: Elastic frame analysis Plastic frame analysis Decision about the type of cross-section verification: Elastic verification Plastic verification Effective cross-section properties Decision on the member buckling formulae with respect to the degree of local plastic capacity: Plastic interaction: class 1, 2 Elastic interaction
12 Classification of cross sections How to classify a cross section? Classification of each plate elements (in full or partial compression) composing the section. Compare the slenderness c/t with specific limits, established to prevent local plate buckling (Table 5.2 of EC3-1-1). Cross section class = most unfavourable class of all plate elements (flange or web). Cross section class depend of the: slenderness c/t; support conditions (internal or external part); distribution of direct stresses (acting forces); class of steel (higher steel grades sections tend to fall into higher classes). Simple support t Free edge b L
13 Plate element classification acc. to Table / f y
14 Plate element classification acc. to Table 5.2
15 Acknowledgments Use of material (powerpoint presentations from SEMI-COMP+ Seminar in Guimarães, Portugal, 23.NOV.2011) is gratefully acknowledged. Thank you for your attention
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