International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 11 Issue: 06 | Jun 2024
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p-ISSN: 2395-0072
Fragility Assessment of GFRP Reinforced Shear Wall at Different Locations in Multi-Storied Building Niny Sam1, Radhika P2 1 PG Student, Mar Baselios College of Engineering, Trivandrum
2Assistant Professor, Mar Baselios College of Engineering, Trivandrum
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Abstract - Multi-storied buildings are generally constructed
Construction of high-rise buildings can solve all these problems, but more concern should be taken in the lateral load combinations while increasing the height of the building. Hence framed structures are constructed with shear walls which acts as vertically oriented wide beams, starts from the foundation level and extends throughout the building's height that can carry lateral loads together with the gravity loads [15]. To dissipate the earthquake loads and energies, recent advances in seismic studies has been arrived to use GFRP bars as the primary reinforcement in the seismic resistant buildings due to its inelastic deformation. These GFRP bars are used as the reinforcement material rather than traditional steel rebars because of its corrosion free property and better durability than steel bars. It can be utilized in the construction of buildings in coastal areas, bridge decks, superstructure in waterbodies etc., due to its economic benefits, better material properties and its availability. These GFRP bars has dielectric properties, high tensile strength and possess light weight characteristics [19].
with shear walls to withstand high lateral loads such as earthquake and wind loads. Shear wall systems provide greater strength and high stiffness to withstand heavy horizontal loads and sustain gravity loads. To construct a costeffective and corrosion-free lateral resistant system, steel reinforcements in the shear walls are replaced with Glass Fibre Reinforced Polymer (GFRP) bars. There is more concern about the placing of shear walls in reinforced concrete buildings because it affects the seismic behaviour of the structure against the external lateral forces acting on it. The major reason for the appropriate orientation and placement of shear walls in the RC structure is to avoid the torsion generated in the building due to the eccentricity caused by the improper arrangement of shear walls. This study employs Incremental Dynamic Analysis (IDA) to assess the vulnerability of a G+7 storied building with different shear wall locations of idealised structure using seismostruct software. Fragility curves are generated using the guidelines from FEMA 58-1, which provides the probability of exceedance in different structural models. In this study modelling and analysis are done in buildings with different location of shear wall to find out the most preferable arrangement of shear wall to resist the lateral loadings and probability of collapse ratio is analysed. Ten different far field ground motion data is collected and IDA has been performed for each structural arrangement.
In multi-storied buildings, shear walls are most important in designing process. Thus, shear wall design and construction are done with high supervision so that positioning of shear wall should be done with more accurately and efficiently. It is necessary to check the position of mass centre and hardness centre of the structure in deciding the distance of shear wall location from the mass centre of the structure for the proper shear contribution in shear wall. [15]. To obtain the seismic behaviour of RC Structure, a method known as Incremental Dynamic Analysis (IDA) has been adopted in recent researches in which one or more ground motions are chosen and modified so that they fit the different Intensity Measure (IM) using a scaling factor. Then Non-Linear Time History Analysis has been done for each Intensity Measure levels until the structure attains its structural instability and measures its level of damage [6]. Since high rise buildings shows more dynamic properties, seismic probabilistic analysis is developed using fragility curve and thus seismic vulnerability can be measured [2].
Key Words: Shear wall, Lateral loads, Glass Fiber Reinforced Polymer Bars, RC Structure, Incremental dynamic analysis, Fragility
1.INTRODUCTION Considering the current scenario, multi-storied RC buildings are constructed to withstand the lateral loads including earthquake and wind loads. RC Buildings which are constructed in seismic areas collapses due to severe earthquakes. To resist these loads vertical structural members such as shear walls can be implemented and stability of the building can be increased. These shear walls are rigid vertical diaphragm capable to sustain the combined axial, moment, and shear loads brought on by the earthquake and wind loads [16]. Now-a-days high rise buildings are most common in the construction field due to the shortage of land and many factors such as the growing population rate, increase in the cost of land, urbanisation and many more.
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2. METHODOLOGY 2.1 Description of Building The research has been done using an idealised G+7 storied structure with geometric properties listed in table 1. In this study shear wall has been placed in different locations to
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