Parametric Study of Vertically Irregular Building Having Mass and Stiffness Irregularities (original) (raw)
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International Journal of Science and Research (IJSR), 2016
Nowadays, as in the urban areas the space available for the construction of buildings is limited. So in limited space we have to construct such type of buildings which have can be used for multiple purposes such as lobbies, car parking etc. To fulfill this demand, buildings with irregularities is the only option available. During an earthquake, failure of structure starts at points of weakness. This weakness arises due to discontinuity in mass, stiffness and geometry of structure. Vertical irregularities are one of the major reasons of failures of structures during earthquakes. To study the behaviour of the building having various vertical irregularities at different floor levels six models have been considered in this project. All the models were analyzed by using SAP 2000. The methods used for the analysis are static method and response spectrum method.
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The buildings constructed in the present scenario are mostly irregular in geometry and elevation for aesthetic view. These irregularities may also be due to economical feasibility, land availability and other factors. From the past earthquake, researches says that regularly configured structures stay safe in Earthquakes, but irregularly configured structures could not able to withstand effectively during an earthquake. Structures experience lateral deflections under earthquake loads. This work focuses on studying the various sorts of building irregularities possible and their behaviour during seismic forces. This study focuses on learning the parameters to be analysed while analyzing a structure for seismic force. The various structural behaviour parameters such as displacement, base shear, storey drift, stiffness, strength etc., are needed to be studied. Also to know the model analysis methods those are available for seismic analysis of a structure. Some model analysis methods are ...
Seismic Analysis of Irregular Buildings
In countries like India where the mountains, hills and the plateaus form a significant part of its terrain. It is the increasing demand of the time to construct the RCC Buildings in hilly regions due to urbanization. The construction at hills is different from plains as they are more prone to seismic activities. As the buildings on sloping areas are having irregularities, the behavior of the building during earthquake depends upon the distribution of the mass and stiffness in both the horizontal and vertical direction. They are more susceptible to severe damage. Moreover, during earthquake, irregular buildings in hilly areas serve more damage. Dynamic response of hill buildings is somewhat different than the buildings on flat ground. Short column of RC frame building serves damage because of attracting more forces during earthquake. The RCC Buildings on the hilly regions are narrowed down to basic formats as step back and set back-step back and set back frames. The dynamic response i.e. fundamental time period, storey displacement and drift, and base shear action induced in buildings have been studied for buildings of different heights. The regular, set back and step back building frames are analyzed and compared in this study.
Parametric Studies on the Seismic Behavior of Irregular Structures
Lecture Notes in Mechanical Engineering, 2019
Irregular structures subjected to earthquake loads demand attention as they behave differently from regular ones. The number of irregular buildings being constructed is increasing yearly. Irregularities are unavoidable in certain cases, whereas in some other cases they are architecturally planned. Design of frame configurations incorporating such irregularities without compromising the performance of the structure needs detailed investigation on the parameters that influence the structural behavior. In this study, parametric studies are carried out in order to understand the effect of the type, degree, and location of irregularity on the behavior of structures. All these factors are found to affect the response of the structures significantly. The parameters such as mass, total cross-sectional area of columns, and storey height are considered for this study.
IJERT-Seismic Parametric Study on Different Irregular Flat Slab Multi-Story Building
International Journal of Engineering Research and Technology (IJERT), 2016
https://www.ijert.org/seismic-parametric-study-on-different-irregular-flat-slab-multi-story-building https://www.ijert.org/research/seismic-parametric-study-on-different-irregular-flat-slab-multi-story-building-IJERTV5IS040612.pdf With the advancement in the growth of urbanization and for aesthetic requirements, building with irregular structural forms are widely constructed. Irregularity in structures are mainly due to variable distribution of mass, stiffness, and strength or due to irregular geometrical configuration. This present study summarizes the behavior of G+10 irregular Flat Slab building with Vertical irregularity and Plan irregularity under seismicity. Linear static and dynamic analysis of models are performed by using ETABS to determine Earthquake response parameters like Base Shear, Natural Period and Displacement. Conclusions are woven based on the obtained results.
Seismic Assessment of Vertical Irregular Buildings
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SEISMIC ANALYSIS OF VERTICAL IRREGULAR MULTISTORIED BUILDING
It is understood that buildings which are regular in elevation (regular building) perform much better than those which have irregularity in elevation (irregular building) under seismic loading. Irregularities are not avoidable in construction of buildings. However a detailed study to understand structural behaviour of the buildings with irregularities under seismic loading is essential for appropriate design and their better performance. The main objective of this study is to understand the effect of elevation irregularity and behaviour of 3-D R.C. Building which is subjected to earthquake load. In the present study, a 5 bays X 5 bays, 16 storied structure with provision of lift core walls and each storey height 3.2 m, having irregularity in elevation, is considered as the soft storey 3-D structure. An Irregular building is assumed to be located in all zones. Linear dynamic analysis using Response Spectrum method of the irregular building is carried out using the standard and convenient FE software package. To quantify the effect of different degrees of irregularities all the structures are analysed. In addition, the analysis carried out also enables to understand the behaviour that takes place in irregular buildings in comparison to that in regular buildings. For this the behaviour parameters considered are 1) Maximum displacement 2) Base shear, 3) Time period.
Effect of Irregularities on Seismic Performance of Building
During an earthquake, failure of structure starts at points of weakness. This weakness arises due to discontinuity in mass, stiffness and geometry of structure. The structures having this discontinuity are termed as Irregular structures. Irregular structures contribute a large portion of urban infrastructure. The irregularity in the building structures may be due to irregular distributions in their mass, strength and stiffness along the height of building. Irregularities such as mass, stiffness, plan, and torsion are one of the major reasons of failures of structures during earthquakes. So, the effect of these four irregularities in the seismic performance of structures becomes really important. Height-wise changes in stiffness and mass render the dynamic characteristics of these buildings different from the regular building. When such buildings are constructed in high seismic zones, the analysis and design become more complicated. There are two types of irregularities vertical and ...
SEISMIC ANALYSIS OF PLAN IRREGULAR BUILDING
IAEME PUBLICATION, 2018
At the Earth's surface, earthquakes manifest themselves by shaking and sometimes displacement of the ground. Earthquakes are the most undesirable and distressing of all natural calamities A building with discontinuity is subjected to concentration of forces and deformations at the point of discontinuity which may leads to the failure of members at the junction and collapse of building when the epicenter of a large earthquake is happened. Equivalent Static Analysis is the simplest method and is often used for low to medium-rise buildings with regular shapes. It involves assuming a static load equivalent to the maximum dynamic load that the building is expected to experience during an earthquake. This method is easy to perform but may not accurately capture the dynamic behavior of the building. Response spectrum analysis is a more advanced method that considers the building's dynamic response to a ground motion. This method uses a response spectrum to calculate the building's response to different frequencies of seismic waves. The aim of this project is to conduct a comparative study of the seismic analysis of plan irregular buildings. The study will involve the analysis of several building designs using different methods and tools. The primary objective is to evaluate the effectiveness of different seismic analysis techniques in predicting the behavior of plan irregular buildings under seismic loading. This project is concerned with the study of high-rise irregular building. The structural analysis of G+10 storied reinforced concrete regular and irregular frame building is done with the help of “2019-ETABS” software. Response Spectrum Analysis (RSA) has also been carried out in the study. This approach permits the multiple modes of response of a building to be taken into account.
IJERT-Investigation of Damages in Plan Irregular Buildings Due to Seismic Excitation
International Journal of Engineering Research and Technology (IJERT), 2021
https://www.ijert.org/investigation-of-damages-in-plan-irregular-buildings-due-to-seismic-excitation https://www.ijert.org/research/investigation-of-damages-in-plan-irregular-buildings-due-to-seismic-excitation-IJERTCONV9IS09020.pdf Buildings suffer much less damages in earthquake than buildings with irregular configurations having simple regular geometry and uniformly distributed mass and stiffness in plan as well as in elevation. In the present study, an attempt has been made to analyze the seismic behavior of G+9 regular building and an irregular re-entrant corner building in zone V seismic zone using Etabs 2016. Irregularity can be vertical as well as horizontal. Vertical irregularities can be classified into four depending upon the distribution of mass, strength, stiffness and vertical setback. Horizontal irregularities are those with asymmetrical plan shapes, re entrant corners, diaphragm discontinuity and also irregular distribution of mass, strength, and stiffness along plan. Parameters such as base shear and time period are found out for the regular building. Base shear, time period, overturning moment and maximum storey displacement of re-entrant corner irregular building is found out. From this study, it is concluded that the re-entrant corner irregular buildings have much lower base shear force produce under earthquake forces as compared with the regular building with same structural configurations.. As a future scope seismic response of more re-entrant corner models with same structural details can be found and comparison can be done.