What I suggested was to use 15% and you have already mentioned in your post why 15% is my number and I got it from Michael N. Fardis book on seismic design based on EC.yet they demand more from PT slabs than what is suggested for RC once. What is the reinforced concrete deep beam and where it used? The basis for the third assumption stems from the reasoning that the frame is composed of individual portals as shown in Fig.3. PORTAL METHOD OF APPROXIMATE ANALYSIS. Lateral Load Analysis of Moment Resisting Frame. The horizontal shear is divided among all the columns on the basis that each interior column takes twice as much as exterior column. Most lateral loads vary in intensity depending on the building's geographic location, structural materials, height and shape. There are three major assumption that applied in the approximate portal method of analysis. Firstly, keep in mind that it is interstory drift, rather than absolute drift, that will matter the most in this. Please enter your email address. So it's either full stiffness or some slightly reduced value in reality. Hardbutmild thanks, I am supposed to design the slab and so its upto me to recommend the stiffness modifiers for the lateral load resisting system designing guys and they say the modifier used for slabs is affecting the system critically . By joining you are opting in to receive e-mail. Become VIP Member, Do you need to remove the ads? Concrete tensioning does not really stiffen the slabs - it just changes the behaviour of the concrete section through introduction of an axial component. Analysis of the problem yields deflections, Typical lateral loads would be a wind load against a facade, an earthquake, the earth pressure against a beach front retaining wall or the earth pressure against a basement wall. Will the shear walls shield the slab-column joints from excessive cracking or wont they? The latter source is usually the only reliable one. Is there any approximate method to analyse lateral uniformly distributed loads? It makes sense that some increase of the stiffness occurs due to post tensioning, but does it matter? What are the Methods of Interpolation of Contours. 6 beginning with G or from K and working across. 5. The energy industry is faced with a tumultuous landscape of challenges that include rising costs and increased market volatility. The knowledge of: Structural requirements Concrete Mix Design Calculation for M20, M25, M30 Concrete with ... Types of Foundation for Buildings and their Uses [PDF], Quantity of Cement and Sand Calculation in Mortar, Elon Musk's Loops: Technology Transforming the Future of Transportation. Tips to Avoid Reinforcement and Embedment Congestion in Concrete Members, Thumb Rules and Specifications for Design of Reinforced Concrete Beam. Slab stiffness for lateral load analysis? Considering the first upper storey, inflection points are assumed at mid height on each column. For engineering and manufacturing organizations, the need for digital transformation of product development processes just became more urgent than ever so we wanted to share an eBook that will help you build a practical roadmap for your journey. Along with gravity load structure has to withstand to lateral load which can develop high stresses. How to rectify the old cement pipeline leakage problem? There is this argument around where I work which goes ' since post tensioned slabs don't crack during service loads, slab stiffness for lateral load computation can go as high as 0.5(eurocode, although it doesn't say for slabs) times the gross stiffness'. The resulting forces are indicated on the diagram. An inflection point is located at the centre of each beam, Fig. The maximum values of shear and axial forces are indicated along each member. "A method of successive approximations is developed for the lateral load analysis of multi-storey structures whereby the axial deformations are taken into account. The structure in high seismic areas may be susceptible to the severe damage. The following example illustrates the procedure involved in the analysis of building frames by the portal frame method. Structural engineering general discussion Forum, https://files.engineering.com/getfile.aspx?folder=354b0db9-1b64-4c3d-a4e2-5, White Paper - Digital Twins and Immersive Technologies in the Energy Industry, eBook - The Future of Product Development is Here, Solutions Brief - Protecting and Rescuing On-Ground Personnel, White Paper - Cobots vs Covid: Today's Manufacturing Reality and Tomorrow's New Normal. The shears are shown without any sign. Dear efr (Civil/Environmental), i looked to the plan of the bldg that you released. Of course, in plane stiffness is high, right? 3. Promoting, selling, recruiting, coursework and thesis posting is forbidden. Obviously an interior column is in effect resisting the shear of columns of the individual portals. How to Design a Two-Way Continuous Slab as per Indian Standards? Some features of the site may not work correctly. Looking to make the design and manufacturing of your products more agile? In this white paper, you will learn how real-time 3D technology can enable this optimization at all stages within the energy industry. 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