1 - Acta Technica Corviniensis

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ACTA TECHNICA CORVINIENSIS – Bulletin of EngineeringACTA TECHNICA CORVINIENSIS – Bulletin of Engineering, Fascicule 3 [July–September] includes original papers submitted tothe Editorial Board, directly by authors or by the regional collaborators of the Journal. In this sense, ACTA TECHNICACORVINIENSIS – Bulletin of Engineering, Fascicule 3 [July–September] includes 25 scientific originals papers.ACTA TECHNICA CORVINIENSIS – Bulletin of Engineering is an international and interdisciplinary journal which reports onscientific and technical contributions. The ACTA TECHNICA CORVINIENSIS – Bulletin of Engineering advances theunderstanding of both the fundamentals of engineering science and its application to the solution of challenges andproblems in engineering and management, dedicated to the publication of high quality papers on all aspects of theengineering sciences and the management.You are invited to contribute review or research papers as well as opinion in the fields of science and technology includingengineering. We accept contributions (full papers) in the fields of applied sciences and technology including all branches ofengineering and management.Submission of a paper implies that the work described has not been published previously (except in the form of an abstractor as part of a published lecture or academic thesis) that it is not under consideration for publication elsewhere. It is notaccepted to submit materials which in any way violate copyrights of third persons or law rights. An author is fullyresponsible ethically and legally for breaking given conditions or misleading the Editor or the Publisher.The Editor reserves the right to return papers that do not conform to the instructions for paper preparation and templateas well as papers that do not fit the scope of the journal, prior to refereeing. The Editor reserves the right not to accept thepaper for print in the case of a negative review made by reviewers and also in the case of not paying the required fees ifsuch will be fixed and in the case time of waiting for the publication of the paper would extend the period fixed by theEditor as a result of too big number of papers waiting for print. The decision of the Editor in that matter is irrevocable andtheir aim is care about the high content‐related level of that journal.The general mission of the ACTA TECHNICA CORVINIENSIS – Bulletin of Engineering is to disseminate academic knowledgeacross the scientific realms and to provide applied research knowledge to the appropriate stakeholders. We are keen toreceive original contributions from researchers representing any Science related field.We strongly believe that the open access model will spur research across the world especially as researchers gainunrestricted access to high quality research articles. Being an Open Access Publisher, Academic Journals does not receivepayment for subscription as the journals are freely accessible over the internet.ACTA TECHNICA CORVINIENSIS – BULLETIN of ENGINEERINGISSN: 2067‐3809 [CD‐Rom, online]copyright © UNIVERSITY POLITEHNICA TIMISOARA,FACULTY OF ENGINEERING HUNEDOARA,5, REVOLUTIEI, 331128, HUNEDOARA, ROMANIAhttp://acta.fih.upt.ro202012. Fascicule 3 [July–September]
1. K. SONI PRIYA, 2. T. DURGABHAVANI, 3. K. MOUNIKA, 4. M. NAGESWARI, 5. P. POLURAJUNON‐LINEAR PUSHOVER ANALYSIS OF FLATSLAB BUILDING BYUSING SAP2000 (STRUCTURAL ANALYSIS PROGRAM)1‐5.DEPARTMENT OF CIVIL ENGINEERING, KLCE, VADDESWARAM, GUNTUR DIST‐522502, INDIAABSTRACT: Recent earthquakes in which many concrete structures have been severely damaged or collapsed, have indicatedthe need for evaluating the seismic adequacy of existing buildings. About 60% of the land area of our country is susceptibleto damaging levels of seismic hazard. We can’t avoid future earthquakes, but preparedness and safe building constructionpractices can certainly reduce the extent of damage and loss. In order to strengthen and resist the buildings for futureearthquakes, some procedures have to be adopted. One of the procedures is the static pushover analysis which is becominga popular tool for seismic performance evaluation of existing and new structures. By conducting this push over analysis, wecan know the weak zones in the structure and then we will decide whether the particular part is retrofitted or rehabilitatedaccording to the requirement. In this paper we are performing the push over analysis on flat slabs by using most commonsoftware SAP2000.Many existing flat slab buildings may not have been designed for seismic forces. Hence it is important tostudy their response under seismic conditions and to evaluate seismic retrofit schemes. But when compared to beamcolumnconnections, flat slabs are becoming popular and gaining importance as they are economical.KEYWORDS: Pushover analysis, Retrofitting, Rehabilitation, Column jacketing, Response Spectrum, Demand curve, Capacitycurve, Plastic hingeINTRODUCTIONThe static pushover analysis is becoming a populartool for seismic performance evaluation of existingand new structures. The pushover analysis of astructure is a static non‐linear analysis underpermanent vertical loads and gradually increasinglateral loads. The purpose of pushover analysis is toevaluate the expected performance of structuralsystems by estimating performance of a structuralsystem by estimating its strength and deformationdemands in design earthquakes by means of staticinelastic analysis, and comparing these demands toavailable capacities at the performance levels ofinterest.TYPES OF ANALYSISDifferent types of analysis are as follows:1. Linear Static Analysis.2. Linear Dynamic Modal Response SpectrumAnalysis.3. Linear Dynamic Modal Response History Analysis.4. Linear Dynamic Explicit Response History AnalysisAmong all the analyses, deformation can be predictedin nonlinear static and dynamic analysis. Twodimensionalnonlinear push‐over analysis is carried outon a typical flat slab building.Flat slab is an American development, originated byTurner in 1906. It is a concrete slab reinforced in twoor more directions so as to bring its load to supportingcolumns, generally without the help of any beams orgirders. Failure of RC flat slab farming systems duringsevere earthquakes have led to widespread rejectionof flat slab as a viable system in regions of highseismicity. Many existing buildings do not have beendesigned for seismic forces. It is important to studytheir response under seismic conditions and toevaluate seismic retrofit schemes. A plot of the totalbase shear versus top displacement in a structure isobtained by this analysis that would indicate anypremature failure or weakness. By conducting thispush over analysis we can know the weak zones in theflat slab then the particular part is retrofitted. Theretrofitting can be done by:a) Column jacketingb) Addition of beams at floorc) Column jacketing and addition of beamsThe retrofitting of ground storey by column jacketingis a good cost effective technique but is adequate onlywhen seismic deficiency is small.The beam retrofitting reduces the sagging hingingsignificantly. Increasing the number of storey ofretrofitting by either column retrofitting alone orbeam retrofitting alone does not improve thebehavior significantly.When column jacketing and addition of beam areadopted simultaneously on more number of stories,large increase in lateral strength and stiffness can beachieved.PUSH OVER ANALYSISThe pushover analysis of a structure is a static nonlinearanalysis under permanent vertical loads andgradually increasing lateral loads. The equivalentstatic lateral loads approximately representearthquake induced forces. A plot of the total baseshear versus top displacement in a structure isobtained by this analysis that would indicate anypremature failure or weakness. The analysis is carriedout up to failure, thus it enables determination ofcollapse load and ductility capacity. This type ofanalysis enables weakness in the structure to beidentified. The decision to retrofit can be taken in suchstudies.NECESSITY OF NON‐LINEAR STATIC PUSHOVER ANALYSISThe existing building can become seismically deficientsince seismic design code requirements are constantlyupgraded and advancement in engineeringknowledge. Further, Indian buildings built over past© copyright FACULTY of ENGINEERING ‐ HUNEDOARA, ROMANIA 21
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