Parametric analysis of irregular structures under seismic loading according to the new Turkish Earthquake Code (original) (raw)
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Torsional Behavior of Plan Asymmetric Shear Wall Buildings under Earthquake Loading
Multi-storey buildings with irregular geometry and structural systems have become prevalent due to various possibilities offered by modern materials and construction methods. However, damage from past earthquakes shows that strong torsional effects are responsible for the collapse of asymmetric buildings. Torsional irregularity depends on a number of factors like plan geometry, dimensions or position of structural elements and number of storeys. Torsional irregularity in plan, induced due to change in position of the lateral load resisting elements (shear walls) in reinforced concrete shear wall buildings of varying aspect ratios is studied in this paper. Initially symmetric buildings with L-shaped shear walls on diagonally opposite corners, and on all four corners are considered. A stipulated amount of eccentricity is introduced in these building configurations by changing the positions of the structural walls along the plan. Time history analysis is carried out to evaluate the torsional behaviour of the asymmetric buildings in terms of variation in base shear, fundamental time period, roof deflection and floor rotation. The results show that change in the dynamic eccentricity of the shear wall buildings causes variations in floor rotation and torsional response of both the building configurations.
Investigation of the effect of torsional irregularity on earthquake behaviour
The Journal of Engineering Research, 2018
One of the major reasons for damage to the buildings during the earthquake is the vertical and plan irregularities in the buildings. Torsional irregularity is a type of irregularity that is included in many earthquake regulations in the world as irregularity. Knowing the factors affecting torsional irregularity by investigating the behavior of torsional irregular buildings is very important for avoiding this irregularity. In this study, the different number of story and the different located shear wall in plan were handled. Earthquake analyzes of these buildings were made separately for the three different earthquake analysis methods defined in Turkish Earthquake Code-2007 (TEC-2007). The variation of the torsional irregularity according to the number of story and the earthquake analysis method was investigated.
IRJET, 2022
The behavior of multi-Storey buildings during strong earthquake motion depends on the structural configuration. Most structures today have asymmetrical plans and vertical arrangements. A high degree of engineering designerners' effects is necessary to adequately analyze and understand irregular construction. From the observation of past earthquake structures with regular configuration, structures stay safe in earthquakes than structures with irregularities. Structure experience lateral displacements under earthquake loads. These works focus on studying the multi-Storey structure with the same area as an irregularly shaped building with Square, L, C and I shapes against seismic loads and seismic vibrations. The various structural behavior parameters such as displacement, base shear, story drift & time-period are needed to be studied.
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.
Torsional Behavior of Irregular Structures during Earthquakes
2019
Many buildings in the present days have irregular shapes in both elevation and plan. Past earthquake studies show that buildings suffer severe destruction during earthquakes due to torsional irregularity.When and how to consider torsion effects is depended on the criterion andrelative restrictions for torsional irregularity. Relationship between the degree of irregularity and the change in behavior could developed which allows guidance as to a) When the effect of structural irregularity can be neglect, andb) The change in demands for different degrees of structural irregularity. Provisions in different earthquake codes about torsional irregularity are presented. This study was initiated to define the effect of different degrees of irregularity on structures designed for earthquake by investigation torsional irregularity behavior of different irregular structures using simplified analysis.At first focuses in studying the complex behavior of structure under asymmetric form; a study on...
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.
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.
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.
Technology Effect of Horizontal Irregularity on Seismic Behavior of Building
2015
Asymmetry in structures makes analysis of the seismic behavior very complicated. Recent earthquakes have shown that the structure with plan irregularity results in irregular distribution of mass and stiffness. In this paper an effort has been made to understand seismic behavior of building with plan irregularity and symmetric building. The results of analysis carried out by the authors for investigating the seismic behavior of asymmetric-plan buildings are reported. A G+9 storied bare RC special moment resisting framed building is considered for the response spectrum analysis using SAP 2000 v.15. It is concluded that the symmetric building performs well as compared to asymmetric building in the event of earthquake.
Study on Torsional Response of Irregualr Buildings Under Seismic Loading
IRJET, 2022
The demand for aesthetics and the scarcity of available land have led to an increase in the trends of building irregular structures in the modern world. Under seismic action, a structure's torsional reaction caused by abnormalities in the structural arrangement results in severe damage and early failure. One of the many irregularities that might occur in a structure and have a disastrous impact when an earthquake is triggered is torsional irregularity. The purpose of this study is to comprehend how irregular structures respond to torsional loads caused by earthquakes and how bracing can be used to control torsional irregularity. ETABS 19 programme is used to model and analyse a rectangle, L shape, T shape, and two models with vertical setback. Seismic analysis uses linear static and linear dynamic approaches.