EUROCODE 6 Design of masonry structures

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1 Dissemination of information for training Brussels, 2-3 April EUROCODE 6 Design of masonry structures

2 Dissemination of information for training Brussels, 2-3 April EUROCODE 6 Combined loading Poul Christiansen Danish Technological Institute poul.christiansen@teknologisk.dk

3 Combined loading Dissemination of information for training Brussels, 2-3 April Walls subjected to vertical and lateral load Walls supported by edges and with openings Edges restrained or simply supported

4 Distribution of wind load between outer and inner leaf Dissemination of information for training Brussels, 2-3 April Either: 1. A distribution between the outer and inner leaf. or 2.The total wind load applied on the inner leaf, when (5.11) is used. t = k t + ef tef 1 2 If 1. Either: A. According to the stiffness ( EI) 1 WEd,1 = WEd,1 ( EI) + ( EI) B. According to the capacity W cap = W cap,1 + W cap,2 (6.3.1 (6)) In this example (5.11) is used t 1 2

5 Horizontal and vertical load Dissemination of information for training Brussels, 2-3 April Yield line theory is relevant for openings, 3-4 sided walls. Φ- method is relevant for 2. order effects and walls supported in top and buttom The link between the methods is the equivalence of M Ed. Thus an equivalent windload is introduced: W eqv (<> W ed ) (Annex I)

6 Determining w eqv Dissemination of information for training Brussels, 2-3 April The apparent flexural strength: f xd1,app = f xd1 + σ (6.16) The moment of resistance: M Rd = (1/6)(t eff ) 2 x f xd1,app Based on the yield line theory: W cap is calculated The actual moment due to (W ed ): M Ed = (W Ed / W cap ) x M Rd Link: (1/8) x h 2 x W eqv =M Ed = (W Ed / W cap ) x M Rd Finally: W eqv = (8/h 2 ) x (W Ed / W cap ) x M Rd

7 Determining the effective thickness Dissemination of information for training Brussels, 2-3 April The thickness can be formally altered: When formula 5.11 is used: t = k t + ef tef 1 2 When table 5.1 is used: t t ef = When using both formulas the expression will be: t ef = k tef t1 + ( ρtt 2)

8 Determining the effective height Dissemination of information for training Brussels, 2-3 April For this example the effective height will normally be set equal to the geometrically height. i.e.: h eff = h In Eurocode there are rules for determining ρ 3 and ρ 4, i.e. the reduction factor for 3 and 4 sided supported walls (without openings). E.g.: 1 = h 1+ l ρ4 2 (5.8) To implement openings following procedure can be used.

9 Determining the effective height Dissemination of information for training Brussels, 2-3 April The effective height is determined in sections

10 Determining of the eccentricity Dissemination of information for training Brussels, 2-3 April The main issue when regarding the eccentricity at the top (and the bottom) is the stiffness of the slab in the moment of fracture. The eccentricity can in practice be t/2 in favour of the construction or t/2 in disfavour of the construction. The implication for the load capacity is large.

11 Determining of the eccentricity Dissemination of information for training Brussels, 2-3 April The Danish approach is to define an interval of eccentricity producing an interval for the compression stress. For stiff slabs, foundation, etc the interval is the bearing length. For slack slabs it is half the bearing length.

12 Determination of the compression zone Dissemination of information for training Brussels, 2-3 April Determination of the compression line/ zone after determining h eff, t eff, W eqv, etc is done by the usually statically methods. Wide of the compression zone is determined by f d The slack slabs with an eccentricity in disfavour to the construction gives a decreased load capacity. Here an area where the neccessity for f xd1 is actual The shape of the compression zone is an affinity to the moment

13 Determining the load capacity Dissemination of information for training Brussels, 2-3 April To cover the spectra of eccentricities Φ fl is introduced in (4) (ii). Here the extended Navier expression is used to cover the area of small N and large M

14 Final comments Dissemination of information for training Brussels, 2-3 April Thank you for listening Any later comments, etc to the papers: Computer program on the Internet for designing according to EN :

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