These new design moments allow the mxy moment to be considered when designing the section. Design of concrete slabs reinforcement methods of fem. Application of woodarmer moments in the design of concrete. Woodarmer moment calculation tool woodarmer is a postprocessor to superstress and is used to aid the design of reinforced concrete slabs and bridge decks idealised as grillages, it forms part of the superload package, or can be supplied separately as a bolt on module to superstress. In this article, a potential source of misinterpretation of the original equations is identified and corrected.
Slab design by wood armer method teaching mathematics scribd. This article deals with common not only woodarmer methods of concrete slab reinforcement design incorporating twisting moments, design of skew angle reinforcement etc. Mar 28, 2021 the design moments separate the moments in each direction into the top and bottom surfaces i. Dec, 2009 wood armer is useful because it allows moment triads from grillages mx, my, mxy to be transformed into simple bending moments in two directions for reinforcement design. It allows you to view the critical wood armer moments top and bottom, localx and local y directions and the corresponding load combinations for concrete plates shells. Simplified design method moment compared to fe design moment. This method was developed by considering the normal moment yield criterion johansens yield criterion aiming to prevent yielding in all directions. Wood armer design moment for top reinforcement in ydirection wood armer design moment for bottom reinforcement in ydirection wood armer design moment for top reinforcement in xdirection wood armer design moment for bottom reinforcement in xdirection ultimate negative moment capacity of slab per unit width about an axis parallel to h. Application qf these equations will lead, in many cases, to an improved assessment for bridges previously analysed using the wood armer equations and found to require a load restriction. These moments are used directly in computing the required plate reinforcement areas. Sep 03, 2011 wood armer design moment for top reinforcement in ydirection wood armer design moment for bottom reinforcement in ydirection wood armer design moment for top reinforcement in xdirection wood armer design moment for bottom reinforcement in xdirection ultimate negative moment capacity of slab per unit width about an axis parallel to h. Apply solutions of armor guard by brush or spray until wood surface is thoroughly wet, at a. The following are methods of determining reinforcement of plates and shells.
Design rules based on the wood and armer method can be stated as follows 2 3awhere all plus signs apply only to bottom reinforcement, and all minus signs. A beam with more than simple supports is a continuous beam. Remarks on methods of calculating plate and shell reinforcement. This is important because the twisting moment mxy can be significant.
Wood the reinforcement of slabs in accordance with a predetermined field of moments, concrete, fevrier 1968, aout 1968 correspondance. Wood, the reinforcement of slabs in accordance with a predetermined field of moments. The wood and armer equations are well established as a means of accounting for torsional moments in bridge slabs. On the wood armer options dialog ensure the reinforcement skew angle is set to 90 and the distances to the centre of the reinforcement are set to 0.
As the primary purpose of armor content is the professional development of armor branch soldiers, armor focuses on materials for which the armor school has proponency. Application examples manual bridge, civil and structural. Simplified design method moment compared to fe design moments 320. This is useful to design the slab from the staad output moment results. Pdf the wood and armer equations are well established as a means of accounting for torsional moments in bridge slabs. One method for floor slab design combines the twisting moment mxy with the direct moments mxx, or. Method of calculating plate and shell reinforcement area. The visualization of contour maps is directly supported in nextfem designer v. The moment capacity of the slab in the sagging and hogging zones needs to be entered. All these methods are based on the use of moments per unit length, m. I am trying to verify this by hand using aci318 design code. To make distinctions between the equations quoted from the code and the. This product can expose you to chemicals including wood dust which are known to the state of california to cause cancer, and methanol, which are known to the state of california to cause birth defects or other reproductive harm.
Like a paint chip, an actual sample of our shingles will help you make the right choice when you see how the colors appear to change as light conditions do. These cookies are used to collect information about how you interact with our website and allow us to remember you. For an irregular hypothetical slab as shown below, the wood armer moment result in the direction of reinforcement i. This method provides simple equations to design a concrete slab based on the output from a finite element analysis software. Pdf twisting moments in twoway slabs design methods for. Wood and armer method wood and armer proposed one of the most popular design methods that explicitly incorporate twisting moments in slab design. Armor may wish to publish ed material, and in that instance, individual authors s will be protected by special arrangement. Mechanics lecture 7 moment of a force, torque, equilibrium of. Details concerning the method can be found, for instance, in r. If either, or both ends of a beam projects beyond the supports, it is called a simple beam with overhang. On the wood armer options dialog ensure the reinforcement skew angle is set to 90 and the. The wood armer calculation is a postprocessing operation of the basic results and the memory allocation here will generally be done dynamically by requesting virtual memory as it is required. The assessment of reinforced concrete slabs and bridge decks.
The amount of dynamic virtual memory available is not controlled within the program but as a configuration of the operating system. The assessment of reinforced concrete slabs istructe. Parametric study the total span of the bridges considered for the analysis are 8m, 10m, 12m and 15m for skew angles 0, 15, 30,45 and 60 each. In the design of reinforced concrete slabs the wood armer equations. But the required rebars are calculated based on the wood armer method to obtained the designed moments. Tn328 design for twisting moments in adaptfloor pro wood armer method tn338 temperature effects in multistory buildings. Wood armer moment this website stores cookies on your computer. Concrete design concrete design output wood armer moments displays the following dialog. Jan 06, 2005 shear and moment diagrams and formulas are excerpted from the western woods use book, 4th edition, and are provided herein as a courtesy of western wood products association.
To see a table of woodarmer moments click concrete design output woodarmer moments. The design moments are commonly referred to as woodarmer wood, 1968. The wood and armer equations, first published in the 1960s, are well established as a means of accounting for torsional moments in bridge slabs. The professional bulletin of the armor branch, headquarters. P152advances structural mechanicsdavid johnson design moments.
A brief dialog on woodarmer and twising moments in floor slab design1 bijan o aalami2 preliminary draft september 23, 2012 one method for floor slab design combines the twisting moment mxy with the direct moments mxx, or myy to arrive at the strength condition moment, and use this moment to determine the required reinforcement. Simplified design method moment compared to fe design moment d400mm 48 figure 49. It is common, that design engineer doesnt know, which method his program uses. W armer moments structural engineering general discussion. The design moments separate the moments in each direction into the top and bottom surfaces i. The wood armer method is a structural analysis method based on finite element analysis used to design the reinforcement for concrete slabs. Among the 40 bridge models, 20 bridge models were analyzed by grillage analogy method staad pro and. This guide uses nominal member size, but it is important to note that the designer must apply the. For remedial control of organisms attacking wood or for protection of wood against future infestations two 2 applications of the 10% aqueous solution are normally required. Introduction the wood armer equations were derived for the design of reinforced con. Wood armer discussion it is generally accepted that the wood. Wood the reinforcement of slabs in accordance with a predetermined field of moments, concrete, february 1968 a. The wood armer equations also optimise the total area of reinforcement. Its important to select a color blend for your roof the same way youd select a paint color for a room in your home.
A 2 pages explaining the method of designing the slab using wood armer equations is attached for the benefit of all. Wood and armer proposed one of the most popular design methods that explicitly incorporate twisting moments in slab design. Introduction whichever method is used to determine the moment distribution in a slab or plate, the next problem confronted is normally that of how to ensure that the strength of the plate is adequate to resist the calculated moments. Nowadays finite element software is used for the design. Introduction notations relative to shear and moment diagrams e modulus of elasticity, psi i moment of inertia, in. Technical note a brief dialog on woodarmer and twising.
Design aid 6 beam design formulas with shear and moment. Orthogonal or skew reinforcement may be considered. The woodarmer moments for concrete design table appears tip. Yield line analysis and the wood armer equations both use as a yield criterion the stepped or normal moment yield criterion. This article deals with common not only wood armer methods of concrete slab reinforcement design incorporating twisting moments, design of skew angle reinforcement etc. Chapter 5 design of light wood framing inches by 9. Jul 19, 2019 mxx and myy are the pure moments obtained from analysis acting around the principal directions. How are the slab design moments determined using fe analysis. Design methods for the ultimate load design of slabs, for example yield line analysis, hillerborgs strip method and the woodarmer equations, require a yield. Structural calculations for posttensioned beam and oneway. Myy to arrive at the strength condition moment, and. In the general case, the design moments used for the determination of reinforcement are somewhat larger than the actual bending moments generated in the slab when the wood armer approximation of the program is invoked. Slab design by wood armer method free download as pdf file.
Wood armer torsion design this new torsion design option allows the designer to use the wood armer approach to handle twisting moments in slabs. Design of concrete slabs reinforcement methods of fem results. To provide this torsion design options, a new cross section analysis quantity, absolute twist, is calculated. Wood armer method allows moment triads from plates mx, my, mxy to be transformed into simple bending moments in two directions wood armer moments for reinforcement design of plate elements. Ways of calculating moments as seen from the moment equation, there is an equivalence m r sin. Slab design by wood armer method teaching mathematics. The wood armer equations 1,2 were devel oped to sati sfy th e normal m oment yi eld cri terion, whi ch re qui res th at th e m omen t m n norma l to the n axis see equati on 1 m ust b e. This will help to check the design of software also. The load combination selector is provided in this table only as a convenience to help the user relate the load combination number to the actual load combination itself. Drilling, sawing, sanding or machining wood products can expose you to wood dust. Manual for design and detailing of reinforced concrete to the.
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