Effect of Sequential Construction on Multistoreyed Buildingconferenceinfo.org/admin/resources/project/paper/f... · been made to analyze multistorey buildings of various heights with

Conference Proceeding ofInternational Conference on Emerging Trends in Science, Engineering and Technology

(ICETSET-2018)at Dr. D. Y. Patil Technical Campus Lohegaon, Dr. D Y Patil School Of Engineering, Pune, Maharashtra, India

on 21st & 22nd March 2018, ISBN: 978-93-87433-17-5

450 Dr. Suchita K. Hirde, Prasanna R. Bhosale

Effect of Sequential Construction on Multistoreyed Building

Dr. Suchita K. HirdeProfessor, Applied Mechanics Department, Government College of Engineering, Karad.

Prasanna R. BhosalePG Student, Applied Mechanics Department, Government College of Engineering, Karad.

ABSTRACTIt is well known concept that RC structures are constructed step by step, however in practice, engineers while analyzingand designing structures neglect the effects of construction sequence and the loads are assumed to be appliedsimultaneously. In this paper the effect of construction sequence over the axial forces of column has been outlined. Theeffect of applying dead load sequentially is an important factor and should be considered while analyzing multistoreyedframe structure. One of the ways to include the effect of sequential method properly is by carrying the analysis throughstep-by-step procedures. It is observed that the effect of construction sequence increase with the increase in storeys.Therefore, the effect of construction sequence cannot be neglected and a precise analysis should be conducted.KEYWORDSAxial load, creep, shrinkage, sequential construction analysis.

INTRODUCTIONHigh rise structure is a rapidly increasing trend in civil engineering all over the world. Steel structures aregenerally adopted for high rise structures due to their ductility and strength. However, in India steel structuresare avoided due to their difficulty in availability and cost, RC high rise structures are therefore adopted. Overthe years, multistoreyed structures have been analyzed as single step as a complete frame with all loads actingon a given instant. However, in practice the loads are applied one after another after suitable time intervals asthe construction process is carried out step-by-step. In such case the time dependent effects like creep andshrinkage induce additional forces; such forces are generally neglected in linear analysis.Construction sequence analysis also known as stages construction analysis is a nonlinear static analysis whichconsiders the step-by-step loading of a structure. Loads of the structure is applied as the frame proceeds. Thismethod is more accurate and practical as it considers the loads at their actual time of application. The order inwhich the structural members are casted, whether casted monolithically are also important. Henceconstruction sequence analysis should be carried out for precise analysis of structure. In this paper efforts havebeen made to analyze multistorey buildings of various heights with and without consideration of constructionsequence.

CONFIGURATION OF THE STRUCTUREFor this study five buildings with identical plan but with different vertical configurations i.e., G+10, G+20,G+30, G+40 and G+50 are considered. The plan dimensions of the building are 30 m x 12 m. Figure 1 showsthe typical plan of building and figure 2 shows elevation of building. Other structural details are given in table1. The structures were modeled in ETABS 16. Each model includes a 1.5 m plinth height. For each structuretwo models were developed separately, one considering construction sequence and other neglecting the effect.Construction sequence is considered for dead load only. After conventional analysis sequential analysis isdone.





Fig 1: Plan of Structure

Fig 2: Elevation of StructureTable 1: Structural properties

Grade of Concrete M30Grade of Steel HYSD 500

Beam dimensions 300x600Column dimensions 600x600

Storey height 3mPlinth height 1.5m

OBSERVATIONSThe ratio of internal action for column has been obtained for five building models. The variations of axialforces for all structures based on ‘Ratio α’ have been plotted. Value 0 at x-axis represents the axial load atplinth level 1 at ground level and further as the storeys increases. Analysis has been carried out by usingETABS for five models i.e., G+10, G+20, G+30, G+40 and G+50. Effect of axial forces in column have beenstudied for the models and plotted in form of graphs below.α = ℎa) Effect of number of storey on ratio αThe effect of height for different columns were observed and plotted, the columns were selected based ontheir positions.





Fig 3: Effect on Ratio αIt can be observed that the variation in column increases with increase in height on structure. The effect is lesson the lower storeys and the effect increases as the height is increased. The behavior of variation for columnsis similar but changes as the height vary.b) Effect of position of columns on ratio αThe effect of position of columns for every structure were observed and graphs were plotted as follows,





Fig 4: Effect of Column Positions on Ratio αFrom the graphs it can be observed that the variation of ratio α varies with the change in location of thecolumn. The external columns possess more axial load when analyzed without considering sequentialconstruction and hence the ratio is less than 1. The columns located internally possess more axial load whenanalyzed sequentially and therefore the ratio obtained is more than 1.

CONCLUSIONThe effect of sequential construction should be adopted for structures with considerable heights. The variationis less in bottom storeys but is more in top storeys. The effect of variation is constant with respect to theheight of structure. Sequential method should be adopted mainly for columns located in the interior part ofstructure. The position of column determines the effect of variation; the columns located near the center aremore affected which goes on decreasing as the location of column moves away from center.

REFERENCES[1] B SRI Harsha , J Vikranth 2014, “Study and comparison of contruction sequence analysis with regular analysis by

using etabs” , International Journal of Research Sciences and Advanced Engineering [IJRSAE] Volume 2 , Issue 8,PP: 218 - 227 , OCT - DEC 2014.

[2] Snehal D. Poojara, Dr. Paresh V. Patel 2014, “Axial deformation of columns in multi-story R.C.buildings”International journal of civil engineering and technology (ijciet) Volume 5, Issue 3, March (2014), pp. 294-300.

[3] K M Pathan, SayyadWajed Ali, Hanzala T Khan, M S Mirza, MohdWaseem, ShaikhZubair 2014, “ConstructionStage Analysis of RCC Frames”, International Journal of Engineering & Technology Research Volume-2, Issue-3,May-June, 2014, pp. 54-58.

[4] NishantDubey, Ranjan S. Sonparote, Ratnesh Kumar 2015, “Effect of Construction Sequence Analysis on SeismicPerformance of Tall Buildings” Journal of Civil Engineering and Environmental Technology, Print ISSN : 2349-8404; Online ISSN : 2349-879X; Volume 2, Number 11; April – June, 2015 pp 44 – 49.

[5] Tabassum G Shirhatti, Dr. S. B. Vanakudre 2015, “The effects of p-delta and construction sequential analysis of rccand steel building with respect to linear static analysis” International Research Journal of Engineering andTechnology (IRJET) e-ISSN: 2395 -0056 Volume: 02 Issue: 04 | July-2015.





[6] GeethuGirija Das, DrPraseeda K. I. 2016, “Comparison of Conventional and Construction Stage Analysis of a RCCBuilding” ,IJSTE - International Journal of Science Technology & Engineering | Volume 3 | Issue 03 | September2016

[7] Viji R Kumar, Binol Varghese 2017, “Effect of construction sequence analysis along with p-delta and material nonlinearity on floating column structure”International Research Journal of Engineering and Technology (IRJET)Volume: 04 Issue: 05 | May -2017

[8] O.A. Rosenboom, T.F. Paret and G.R. Searer, “ Chronological Construction sequence and pushover analysis of anIconic 1960’s reinforced concrete building”

[9] Sagupta R. Amin, S.K. Mahajan, “Analysis of multi storied RCC building for construction sequence loading”International Journal of Modern Trends in Engineering and Research

[10] R. Pranay, I. YaminiSreevalli, Er. Thota. Suneel Kumar, “Study and Comparison of Construction Sequence Analysiswith Conventional Lumped Analysis Using Etabs”

[11] Shrikar S. Nayak, Ratnesh Kumar, and Ranjan S. Sonparote, “Effect of staged construction analysis on seismicdesign and performance of RC buildings”.

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Effect of Sequential Construction on Multistoreyed Buildingconferenceinfo.org/admin/resources/project/paper/f... · been made to analyze multistorey buildings of various heights with