Effect of Building Plan Irregularity on Seismic Pounding (original) (raw)
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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.
Effect of irregular plan on seismic vulnerability of reinforced concrete buildings
PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON SUSTAINABLE MATERIALS AND STRUCTURES FOR CIVIL INFRASTRUCTURES (SMSCI2019), 2019
In the modern world many buildings have irregular configurations both in elevation and plan. Such types of buildings are more susceptible in earthquake forces. Structural irregularities are more important factors which decrease the seismic behavior of the structures. Buildings with slab openings are often vulnerable to damages, when subjected to lateral loads. The influence of diaphragm openings on the seismic response of multi-storied buildings played a major role in reducing the base shear, hence attracting lesser seismic forces. Correct location of openings can offer efficient strength and serviceability to the structure. It is necessary to identify performance of the structures to withstand against disaster for both new and existing buildings. Opening in the floors is common for many reasons like stair cases, lighting architectural etc., these openings in diaphragms cause stresses at discontinues joints with building elements. Discontinuous diaphragms are designed without stress calculations and are thought about to be adequate ignoring any gap effects. In this study an attempt has been made to know the difference in seismic response of two building having diaphragm discontinuity and without diaphragm discontinuity. In the present study existing building with diaphragms irregularity has been modeled and seismic response will be compared with building without diaphragm discontinuity using CSI SAP200 software. Linear static and dynamic analysis has been carried out. Results of two building have been compared for modal time period, base shear, storey drift and joint displacement.
Building irregularity issues and architectural design in seismic areas
Frattura ed Integrità Strutturale, 2019
When designing buildings in seismic areas, choices of the architectural designer heavily influences seismic structural performances. Namely, building morphology may lead to complex seismic responses as it occurs when building plan and elevation become irregular. Typical irregularities are due to architectural, functional and distribution constraints, thus leading to plan or vertical or combined plan/vertical irregularities. A frequent plan-wise irregularity arises when earthquake resistant structures, such as cores and shear walls, are concentrated on one side of the building plan, while vertical irregularity often arises from the presence of soft stories especially located at the ground level or, less frequently, at an intermediate level. In the last decades, some trends in architectural design, such as Deconstructivism and other contemporary theories, worked in pursuing architectural solutions based on the concept of "deconstruction" in place of "construction", favoring non-rigid schemes, non-regular shapes and, more generally, avoiding geometric rules and classical canons of symmetry and regularity. In this paper the above issues are investigated with the goal of assessing effects of irregularity conditions, introduced by the architectural design, on the building seismic performances with the aim at not forbidding the designer ambitions but at making him aware of the effects of his architectural choices. Citation: Alecci, V., De Stefano, M., Building irregularity issues and architectural design in seismic areas, Frattura ed Integrità Strutturale, 47 (2019) 161-168.
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 Analysis Of Different Irregular Building With Regular Building
IRJET, 2022
This study comprises state-of-art knowledge in the seismic response of vertically irregular building frame, During severe seismic shaking irregular building may suffer disproportionate damage or collapse that can be minimized by increasing robustness. The prime objective of this study is to find out the how irregular buildings shows there behavior when the seismic loads or effects with real time seismic data apply on the structure. Analysis is going to be done with finite element analysis using time history data in the E-TAB 2016 software, and in seismic zone IV.
Effect of Plan Irregularity on RC Buildings due to BNBC-2006 Earthquake Load
— To dates irregular shape of building is being mostly designed by the architects; which offers more beauties. This irregularity may be plan or vertical. Plan or vertical irregularity makes structures vulnerable under seismic loading. Torsional irregularity, overturning moment can rise abruptly having irregularity in a structure. Hence, effect of irregularity is a very important issue to be considered during building design. Bangladesh National Building Code (BNBC) 2006 requires that practically all multi-storied buildings be analysed as three-dimensional systems. This is due to the irregularities in plan or elevation or in both. In the current study six buildings of different shape has been chosen and analysed by imposing seismic loads using finite element software (ETABS v 9.7.4). The shapes of the buildings are rectangular, square, Inverted L, T, U and L. Each of the building has G+6 number of storey and located at seismic zone-I of BNBC 2006. The current study discusses the performance evaluation of RC (Reinforced Concrete) Buildings with plan irregularity. Structural irregularities are important factors which decrease the seismic performance of the structures. The parameters whose effects are regulated such as: Lateral displacement, Storey Drift, Time period, Base Shear, Torsional Irregularity Ratio, Overturning Moment.Eventually it is revealed that, the rectangular shaped building undergo maximum lateral displacement as well as drift in both direction. No change in time period is observed due to change in building plan. Base shear and overturning moment is found maximum for T-shaped building. It has been studied that rectangular shaped building is torsionally irregular.
Irregularity in the buildings due to seismic effects
Irregularity in the buildings due to seismic effects, 2022
This the study of the concrete buildings in which the irregularity occurs due to the effects of the seismic phenomenon. Compression between a regular and irregular buildings is done using the both theoretical approach and analytical approach with the help of ETABS software.
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.
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.
Influence of Plan Irregularity of Buildings
14 th World Conference on Earthquake …, 2008
This article shows an analytical description of the damages caused by different plan irregularities, during seismic events of different magnitudes. Although these effects of architectonic and/or structural configuration have been identified like not adapted in previous damages, have come maintaining their presence in constructions anywhere in the world. The effects of commented irregularities were studied with qualitative analyses of important and recent investigations, as much in Mexico as abroad. The work describes to the geometric forms that are repeated more in the urban areas in México (squared, rectangular, section U, section L and section T), as well as its variations from plants observed with extracted aerial photography of Google Earth. These architectonic plants were modeled in SAP2000 considering one, two and four levels to determine the effect of the geometric form in the seismic behavior of structures with elastic analyses. Also, effects of the extension in rectangular plants and the inclusion of projections in sections with architectonic plants U, L and T were studied. In all the studied systems, effects of different irregularities are analyzed based on the variation of displacements, with respect to regular systems.