The original source is the paper the reinforcement of slabs in accordance with a predetermined field of moments, rh wood, concrete, february 1968, and a followon letter from gst armer, concrete, april 1968. Mar 17, 20 integrated design system for buildings and general structuresmeshed slab and wall design meshed slab and wall design midas gen provides slab and wall design for meshed plate elements as per eurocode 211. As a general mesh is now possible and strips can be arbitrarily placed, only the woodarmer method is available for obtaining the design moments. Pro v8i, the latest version, allows civil engineering individuals to analyze structural designs in terms of factors like force. The application is referred to as woodarmer procedure. The design moment of the slab is modified for each design section to include the twisting moment of the same section woodarmer approximation. The grillage analogy has become popular because of the following reasons. P152advances structural mechanicsdavid johnson design moments. Importantly, both the wood armer and dentonburgoyne approaches recognise the most. For uls, both bending only using woodarmer, and bending and inplane effects using clarknielsen can be considered. The following are methods of determining reinforcement of plates and shells.
Rcdc is the industry leading concrete detailed engineering software. Pdf design of circular concrete tanks design of circular. W armer moments structural engineering general discussion. Method 2 gives a better rep resentation of internal forces in a slab panel than method i.
By using the wood armer facilities in lusas accurate reinforcement quanties can be obtained. Wood the reinforcement of slabs in accordance with a predetermined field of moments, concrete, february 1968 a. This forum also aims in aiding professionals from allied fields such as architecture, construction, sociology, planning, conservation and disaster mitigation to interact with. In this article, a potential source of misinterpretation of the original. Question 2 if the recognition and inclusion of twisting moments mxy is not done explicitly for serviceability check of a floor slab, then where is it used. In femdesign the design forces calculation is based on the mechanism of optimal reinforcement calculation for skew reinforcements made by m. 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. Powered by a sophisticated fem solver increasing capacity and substantially speeding up solution for large and complex models, spmats v8. Slab design by wood armer method free download as pdf file. For an irregular hypothetical slab as shown below, the wood armer moment result in the direction of reinforcement i. How is the varying longitudinal stiffness of ballastconcrete bed considered for rail track analysis.
Wood and armer method wood and armer proposed one of the most popular design methods that explicitly incorporate twisting moments in slab design. The conception of determining equivalent moment is authored by wood and armer. In this article, a potential source of misinterpretation of the original equations is identified and corrected. Working remotely with ram or staad general licensing and installation. Steel section optimisation as per eurocode 3 composite section capacity check as per eurocode 4. Details concerning the method can be found, for instance, in r. Download wood magazine februarymarch 2015 online free. Structural calculations for posttensioned flat slab.
For sls, both bendingonly using principal moments, and bending and inplane effects using principal stresses can be considered, if supported by a chosen design code. The wood and armer equations are well established as a means of accounting for torsional moments in bridge slabs. Results for all or selected parts of a model can be viewed using separate layers for diagram, contour, vector and discrete value data. Wood the reinforcement of slabs in accordance with a predetermined field. Pdf,epub,bucher download armer bastard bucher pdf kostenlose 0520 pdf,epub,bucher download bastard bucher pdf kostenlose 0521 pdf,epub,bucher download bastard.
Manual for design and detailings of reinforced concrete to. The following description will show the way of calculation for moments but the way of the calculation is the same for normal forces too. The woodarmer method is a structural analysis method based on finite element analysis used to design the reinforcement for concrete slabs. This method provides simple equations to design a concrete slab based on the output from a finite element analysis software. It contains important information that may be more current than what is in the manuals. Effect of mxy on design of a slab spreadsheet microsoft. For the love of physics walter lewin may 16, 2011 duration. Structural engineering forum of india, sefi is a forum that enables and supports interaction among structural engineers and addresses the issues that concern them. Method of calculating plate and shell reinforcement wood.
Remarks on methods of calculating plate and shell reinforcement. Frequently asked questions about midas civil problem. Bending moments distribution at the main structural elements. Pro is one of the most widelyused software for developing and analyzing the designs of various structures, such as petrochemical plants, tunnels, bridges etc.
On applying the necessary loads and boundary conditions, the wood armer moments could be checked graphically as well as in form of table. This is important because the twisting moment mxy can be significant. 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. 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. Reinforcement moments can be calculated for primary and secondary layers in the top and bottom faces of slabs for any direction of reinforcement. 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.
Deficiencies of the normal moment yield criterion for rc slabs. In the design of reinforced concrete slabs the woodarmer equations. Wood, the reinforcement of slabs in accordance with a predetermined field of. Oct 04, 20 extraction of slab design wood armor moments for rebar calculation. Need help working from home with your bentley software. Method 2 yieldlines may be successfully used for uniformly loaded slab panels with different boundary conditions. Jan 11, 2015 download wood magazine februarymarch 2015 online free pdf, epub, mobi ebooks. Manual for design and detailing of reinforced concrete to the september 20 code of practice for structural use of concrete 20 2. Finite element analysis will give woodarmer design moments for top and bottom reinforcement in a panel of slab. Also analyses my reinforcement requirements for mx provided. The misinterpretation is shown not to have significant implications for design, but may be of consequence where the wood and armer equations have been used for. Pdf the wood and armer equations are well established as a means of accounting for torsional moments in bridge slabs. To make distinctions between the equations quoted from the code and the.
Importantly, both the woodarmer and dentonburgoyne approaches recognise the most. The axial force, moments and shears for a particular strip are recovered from the analysis on the basis of the wood armer tech this is the civil engineering questions and answers section on rcc structures design with explanation for various interview, competitive examination and entrance test. The woodarmer method is a structural analysis method based on finite element analysis used. Method of calculating plate and shell reinforcement area. Aci documents are available in print, by download, through electronic subscription, or reprint and may be obtained by contacting aci. This publication is in portable document format pdfadobe acrobat. The user can also obtain the moment curvature diagram for. The assessment of reinforced concrete slabs the institution of. By using the woodarmer facilities in lusas accurate reinforcement quanties can be obtained. Please wash your hands and practise social distancing. If you use a method of analysis that produces mxy moment as apart of equilibrium, than you must include it in your design.
Manual for design and detailing of reinforced concrete to the. Wood and armer6 have shown that the strip method gives an exact solution to the collapse load for any given slab provided reinforcement is such that the ultimate moments of resistance of the slab fit the derived moment field precisely. In this chapter information about the building site and the building structure are combined and used to determine the size of footings, reinforcing for the foundation, and the size and spacing of anchorage used to tie the unit to the foundation. Bending moments distribution at the main structural. Integrated design system for buildings and general structuresmeshed slab and wall design meshed slab and wall design midas gen provides slab and wall design for meshed plate elements as per eurocode 211. Pages in category structural analysis the following 85 pages are in this category, out of 85 total. Explicit extraction of twisting moments is neither necessary, nor practiced. Effect of mxy on design of a slab free download as powerpoint presentation. Oct, 20 for the love of physics walter lewin may 16, 2011 duration. How to make a taper from composite t section to composite i 18.
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. Wood 1968 and armer 1968 organize a similar procedure for the flexural design. M1,m2 bending moment effects per unit width in principal directions. Slab behaviours not predicted by woodarmer or dentonburgoyne. The wood armer method is a way of optimising reinforcement design in a reinforced concrete slab. This method was developed by considering the normal moment yield criterion johansens yield criterion aiming to prevent yielding in all directions. Design of reinforced concrete slabs 105 2 shears vx and vv 3 wood armer moments mxt, mxb, mvt and m 4 inplane loads nx and iv method 1 bs8110. Aci documents are available in print, by download, through electronic subscription. Wood, the reinforcement of slabs in accordance with a predetermined field of moments. Manual for design and detailing of reinforced concrete to. If youre looking for a free download links of defining moments pdf, epub, docx and torrent then this site is not for you. This option is very useful for the design under several combinations of bending moments with axial forces as the worst case is never obvious. Calculating deflection due to live load generic importexport hyperstatic actions inprestressing procedure for creatingconcrete outlines tendon and stranddefinition tn4 strength evaluationof existing pt beamsslabs tn175 implementation ofeuropean code tn179 design of posttensionedmembers in bending aci 3182002 tn182 design process tn192 punching. A brief dialog on wood armer 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.
Introduction the wood armer equations were derived for the design of reinforced con. Extensive pre and postprocessing facilities are presented. The design moments are commonly referred to as woodarmer wood. Describes ways of accouting for twisiting moment in designinig a slab. These files may be downloaded for viewing or printing by clicking on the linked titles.
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