Effect Of Shape And Plan Configuration On Seismic Response Of Structure (original) (raw)
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Analytical Study on Seismic Performance of Plan Irregular Structures
2021
The buildings constructed in irregular configuration due to economical feasibility, land availability and other factors. From the observations of past earthquakes, a structure with regular configuration structures stay safe in Earthquakes than an structure with irregularities. Structures experience lateral displacements under earthquake loads. This work focuses on studying the various sorts of building irregularities possible and their behaviour during earthquake forces. The various structural behaviour parameters such as displacement, base shear, storey drift, moment, end forces etc., are needed to be studied. The structures are designed and analysed by Time History Analysis using STAAD.PRO V8i software. From this analysis the results obtained shows that the base shear was higher in regular structure but the load transfer was uniform throughout its height. The L shaped structure showed a least performance during an earthquake.
Seismic Response of Irregular Structures
International Journal of Advance Research, Ideas and Innovations in Technology, 2021
The main objective of earthquake engineering is to analyse, design and build a structure in such a way that the damage to the structure and its structural component during an earthquake is minimized. A large number of papers have focused to study the effect of irregular structures. Being inspired from the work contributed in the study on effect of earthquake on irregular shaped building this research work presents effect of plan and shape configuration on irregular shaped structures. Building with irregular geometry responds differently against seismic action. Plan geometry is the parameter which decides its performance against different loading conditions. This research work aims to evaluate the behaviour of irregularity (plan and shape) on structure under seismic effect. To workout the performance of structure, equivalent static analysis and response spectrum analysis has been adopted. For achieving this objective by using structural based software ETABS 19. Estimation of response such as: lateral displacement, storey drift, and base shear are carried out. Based on these parameters we have compared response of each model. Results are expressed in form of graphs and bar charts. From research it is observed that to minimize the effect of earthquake simple plan and configuration like regular shape must be adopted at the planning stage.
Seismic Behaviour of Plan Irregular Building –An Analytical Study
International Journal of Research in Engineering and Technology, 2015
Asymmetric buildings often undergo unfavorable seismic behaviour, which results the irregular concentration of plastic demand in limited or vulnerable portion of the structure and subsequently, invite the early collapse of the structure during seismic vibrations. L-shaped buildings are among those asymmetric structures which are commonly found in the form of school, office, commercial as well as residential buildings. Accordingly, an analytical study is performed to investigate the seismic behaviour of plan irregular buildings. Moreover, to understand the effect of length of projection of the structure on the dynamic characteristics, different projection length lead to different aspect ratios for the same building plan shape have been analyzed here. It is observed that variation in projection length of such buildings have significant effect on the dynamic characteristics. However, the seismic response of few L-shaped buildings are analyzed using nonlinear static method and results have been shown in terms of capacity curve, performance point, interstorey drift, column shear, and plastic hinge formation pattern. Seismic demands of asymmetric systems are found to be potentially high due to its asymmetric distribution of mass, stiffness and strength, which is one of the major sources of damage, as it causes torsional floor rotation.
A Study on Seismic Performance of Various Irregular Structures
2021
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 ...
EFFECT OF SHAPE ON SEISMIC RESPONSE OF A STRUCTURE
IRJET, 2022
The main objective of earthquake engineering is to analyse, design and build a structure in such a way that the damage to the structure and its structural component during an earthquake is minimized. A large number of papers have focused to study the effect of irregular structures. In this project, the variations in the behaviour of structure with different shape configuration subjected to seismic motion is studied. Building with irregular geometry responds differently against seismic action. Plan geometry is the parameter which decides its performance under different loading conditions. To workout the performance of the structure, equivalent static analysis has been adopted. ETABS 20 software is used for achieving this objective. Estimation of responses such as lateral displacement, storey drift and base shear has been carried out. Based on these parameters the response of each model has been compared. Results are expressed in the form of graphs. From the comparisons made with these parameters, it is observed that to minimize the effect of earthquake simple plan and configuration like regular shape must be adopted at the planning stage.
Influence of Structural Irregularity in Plan Floor Shape on Seismic Response of Buildings
JES. Journal of Engineering Sciences
Buildings with irregularity in plan floors appears to be more susceptible to large deformations and damage when they are subjected to strong ground motion than those with regular plan floors due to the additional accidental torsional forces resulting from the existing eccentricity between the center of mass and center of rigidity of the resisting elements. The evaluation of seismic response of irregular buildings in plan is required in order to determine the seismic level of protection afforded to these buildings by new design provisions which have been introduced to Egyptian code (ECOL201)[15]. Therefore it is intended in the present study to evaluate the performance of gravity loaded irregular buildings in plan under earthquake excitation. The structural irregularities in plan were represented by ten irregular configurations to cover and model the torsional effects. A time history analysis with a peak ground acceleration of 0.25g was carried out for these ten models using finite element program SAP2000[16]. The numerical studies for different configurations of irregularity effect were clear in T-plan shape than others. The base shear induced in the perpendicular direction ranged between 40% and 80% of the base shear in the direction of the motion. The results declared the necessity of executing structural separation in these irregular buildings in plan to minimize the induced perpendicular base shear. Many conclusions are deduced and they are believed to be very helpful to the structural engineer in order to improve the knowledge of the subject and to avoid unintended consequences of ECOL.
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.
The performance of a high rise building during strong earthquake motions depends on the distribution of stiffness, strength and mass along both the vertical and horizontal directions. If there is discontinuity in stiffness, strength and mass between adjoining storeys of a building then such a building is known as irregular building. The present study focuses on the performance and behaviour of regular and vertical irregular G+11 storied buildings under seismic loading. Two types of irregularities namely vertical irregularities and horizontal irregularities are considered in this study. Total ten regular and irregular buildings are modelled and seismic analysis is carried out in Staad Pro and the results are compared.
Seismic Analysis of Regular and Irregular Configuration of Building
As India is the fastest growing country across the globe and in need of shelter with higher land cost in major cities where horizontal expansion is not much possible due to space shortage. Thus, we are left with the solution of vertical expansion.In India basic need of people is not only structurally robust and aesthetically pleasing building but also economical building. To design these building best technology and best material are required.The analysis and design procedure adopted for the evaluation of multi-storey building(G+6) is based on the STAAD Pro. Software. The properties of structural elements are then optimized for the worst load case after a comparative study of reinforcement and concrete requirement for different load cases. Structural planning and design is an art and science of designing with economy andelegance, serviceable and durable structure. The entire process of structural planning and designing requires not only imagination and conceptual thinking but also sound knowledge of science of structural engineering besides knowledge of practical aspects, such as relevant design codes and byelaws backed up by example experience.The process of design commences with planning of structural primarily to meet thedefined as he is not aware of various implications involved in the process of planning and design. The functional requirements and aspects of aesthetics are locked into normally be the architect while the aspect of the safety, serviceability, durability and economy of the structure are attended by structural designer.
COMPARATIVE STUDY OF REGULAR AND VERTICALLY IRREGULAR BUILDING UNDER SEISMIC LOADING.docx
It's a very big challenge that building or structure must withstand lateral forces such as earthquake and wind load. In the present work, the comparative analysis of various structures is performed using SAP 2000. The main aim of the project is comparative study of the stiffness of the structure by considering the three models that is Regular Structure, Plan irregular structure and Vertical irregular structure. All these three models are analyzed with static and dynamic earthquake loading for the Zones II, III, IV & V. The results are tabulated and graphs are plotted for displacement, drift, base shear and time period. Based on the results and discussion the structural behavior and stiffness is concluded for regular and irregular structures , among these structures regular structure shown maximum displacement and drift for all the zones in both static and dynamic analysis.