scholarly journals A Review on Seismic Performance of L-Shaped Building Through Plan Irregularities

2021 ◽  
pp. 251-257
Author(s):  
Yash Chhatani ◽  
Prashant Y Pawade ◽  
Kuldeep R Dabhekar ◽  
Isha P Khedikar
Keyword(s):  
Enhancement Factor ◽  
Feasible Solution ◽  
Ground Movement ◽  
Base Shear ◽  
Structure Development ◽  
Abrupt Changes ◽  
Different Types ◽  
Story Drift ◽  
Overturning Moment ◽  
Dynamic Investigation

The patterns of sporadic structure development have quickly expanded because of tasteful and restricted accessibility of land. Past examinations have indicated that the structures with design abnormality are harmed under solid ground movement. Auxiliary inconsistencies are significant elements which decline the seismic exhibition of the structures. Structures having basic anomalies bring about the lopsided circulation of the story float, exorbitant twist, etc. The irregularity discussed here are about plan irregularity which is available in re-participant corners and torsional anomaly which is caused by abrupt changes in firmness and twist enhancement factor in building. This study is to propose a feasible solution to build this kind of structure in seismically active areas using analytical methods with the assistance of ETABS software. The analysis shall be done through a comparable static horizontal power technique and reaction range examination (dynamic investigation). The basic reactions will estimated regarding story displacement, inter-story drift ratio, torsional irregularity ratio, torsional diaphragm rotation, normalized base shear force, and overturning moment, which are also called seismic response demands. The structure will be analyzed and compare with different types of other shape plan.

Static Analysis of a Meteorological Tower under Lateral Loads

2012 ◽  
Vol 166-169 ◽  
pp. 1498-1501
Author(s):  
Zhi Bin Su ◽  
Sheng Nan Sun
Keyword(s):  
Element Model ◽  
Lateral Loads ◽  
Base Shear ◽  
Meteorological Tower ◽  
Structure Response ◽  
Tower Structure ◽  
Story Drift ◽  
Overturning Moment ◽  
Shell Finite Element ◽  
Concrete Shell

To study a meteorological tower structure response under the lateral loads, the paper established a meteorological tower of reinforced concrete shell finite element model, By analyzing of the structure to get the structure and formation quality modal participation factor, and the structure of the wind load And the response under earthquake were analyzed by the structure of the base shear, overturning moment floors, floor displacements and story drift response.

scholarly journals DYNAMIC ANALYSIS AND COMPARATIVE STUDY OF PLAN IRREGULAR (C-SHAPED) BUILDING WITH DIFFERENT TYPES OF BRACING SYSTEM

2021 ◽  
Vol 6 (3) ◽  
Author(s):  
Abdul Wasey Abdul Wahab ◽  
Dr. P. B. Ullagaddi
Keyword(s):  
Dynamic Analysis ◽  
Response Spectrum ◽  
Vertical Direction ◽  
Base Shear ◽  
Analysis And Design ◽  
Irregular Structures ◽  
Different Types ◽  
Story Drift ◽  
Lateral Displacements ◽  
Bracing System

When the multi-storied buildings are constructed a suitable care should be taken while designing, as they are subjected to lateral forces. The behaviour of multi-story building depends upon either in plan or in vertical direction i.e, elevation, is considered as one of the main causes of failure during earthquakes. Thus irregular structures, especially the structures which are located in seismic zones are required a special attention during analysis and design of structure. In this study Plan irregular (C-shaped building) is considered to carry out study. Bracing system is installed to provide strength against lateral loading and the behaviour of the structure in terms of base shear, story drift, stiffness and the lateral displacements are observed. Three different types of bracings X, V and Diagonal are installed in the structure. Total 4 models are analysed for 7 story height level, 4 Models are computed to determine the performance of the structure. One MRF and three models with different bracing system. And the best suitable bracing system for this study. The method used for this study is response spectrum method, to perform dynamic analysis of the structure.

Analysis of Multi-Story Buildings with Hybrid Shear Wall - Steel Bracing Structural System

2021 ◽  
Author(s):  
Shubam Sharma ◽  
Aditya Kumar Tiwary
Keyword(s):  
Finite Element ◽  
Shear Walls ◽  
Steel Structures ◽  
Lateral Load ◽  
Structural System ◽  
Base Shear ◽  
Time Period ◽  
Story Drift ◽  
Overturning Moment ◽  
Comparative Results

Abstract Numerous studies were contemplated on the structures with distinctive structural configuration and ample amount of work is currently being performed through the investigation of the response of individual behavior of shear walls and bracings by varying configurations and their material properties. Seismic design philosophies had mentioned firmly that a structure must accomplish Life Safety (LS) and Performance Level (PL) for both reinforced concrete and steel structures. This study is anchored on prevailing lateral load resisting system which is virtuous but not adequate to retain vigorous ground motion or acceleration. To overwhelm this problem, an attempt was made to familiarize a new lateral load resisting system formulated by the amalgamation of two different existing lateral load resisting systems, specifically shear walls and bracings. The hybrid structural system embraces two distinctive lateral load resisting techniques, shear walls, and bracings for moment-resisting frame. A numerical finite element study was carried out by the linear dynamic method on the response of structure subjected to seismic condition and an optimal configuration of the different structural patterns is assured by using numerous possible patterns of a hybrid structural system using finite element-based software. The criteria contemplated for study including time period, base shear, overturning moment, story drift ratio, and story displacement are compared with different models and the optimal structure is concluded based upon the recital. The comparative results revealed that there is a reduction noticed in the fundamental time period, and story displacement, where as there is negligible increment in base shear and overturning moment for the hybrid structural system as compared to other configurated models.

scholarly journals Evaluation of Modified Fish-Bone Model for Estimating Seismic Demands of Irregular MRF Structures

2018 ◽  
Author(s):  
Amin Haghighat ◽  
Ashkan Sharifi
Keyword(s):  
Ground Motions ◽  
Fish Bone ◽  
Seismic Demands ◽  
Error Measure ◽  
Ductility Demand ◽  
Earthquake Records ◽  
Moment Resisting Frame ◽  
Different Types ◽  
Story Drift ◽  
Moment Resisting

This paper evaluates the accuracy of the Modified Fish-Bone (MFB) model for estimating the maximum inter-story drift ratio of irregular moment resisting frame (MRF) structures. To make this model applicable to irregular MRF structures, some modifications are made to the MFB formula. In order to evaluate the accuracy of the MFB model, several irregular frames with different types of irregularities are considered when subjected to different ground motions with different intensities. A local and a global error measure are defined and they are calculated for different frame models subjected to different earthquake records. The effects of different irregularities, ductility demand and frame height on the accuracy of the MFB model are investigated. Based on the results obtained from this evaluation, two simple and effective approaches are suggested to improve the MFB models.

scholarly journals Studying a multistory building with different types of bracing

2018 ◽  
Vol 8 (01) ◽  
Author(s):  
Ahmed Falah Hasan ◽  
Ban Ali Kamil
Keyword(s):  
Low Cost ◽  
Lateral Load ◽  
Wind Load ◽  
Multistory Building ◽  
Different Types ◽  
Story Drift

In this paper the effect of different types of bracing had been studied besides studying the effect of height of building. Two different height was studied the first one was a 6-story and 10-story. The studied types of bracing included the V, X, K, and none bracing building. The X bracing is the best type for resist high lateral load,. The building without bracing give maximum story drift and the building may be collapse due to unstability because the lateral load (wind load), the V-bracing give a little different from X-bracing with low cost and easy for construction from X-bracing, and the building is highest the X-bracing is the beast type for bracing.

scholarly journals Numerical Study of Alternative Seismic-Resisting Systems for CLT Buildings

Buildings ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 162 ◽  
Author(s):  
Cristiano Loss ◽  
Stefano Pacchioli ◽  
Andrea Polastri ◽  
Daniele Casagrande ◽  
Luca Pozza ◽  
...  
Keyword(s):  
Numerical Study ◽  
High Capacity ◽  
Shear Walls ◽  
Sustainable Urban Development ◽  
Fe Model ◽  
Base Shear ◽  
Interior Space ◽  
Linear Dynamic ◽  
Story Drift ◽  
Uplift Forces

Changes to building codes that enable use of materials such as cross-laminated timber (CLT) in mid- and high-rise construction are facilitating sustainable urban development in various parts of the world. Keys to this are the transition to multi-performance-based design approaches along with fewer limitations on heights or the number of storeys in superstructures constructed from combustible materials. Architects and engineers have increased freedom to apply new design and construction concepts and methods, as well as to combine timber with other structural materials. They also have started to develop wall arrangements that optimise interior space layouts and take advantage of the unique characteristics of CLT. This paper discusses the seismic response of multi-story buildings braced with a CLT core and perimeter shear walls anchored to foundations and floor platforms using modern high-capacity angle brackets and hold-downs, or X-Rad connectors. Linear dynamic finite element (FE) models of seismic responses of superstructures of various heights are presented, based on experimentally determined characteristics of wall anchor connections. Particular attention is given to fundamental vibration periods, base shear and uplift forces on walls, as well as inter-story drift. Discussion of FE model results focuses on structural engineering implications and advantages of using CLT to create shear walls, with emphasis on how choice of wall anchoring connections impacts the possible number of storeys and configurations of superstructures. Employing CLT shear walls with X-Rad or other types of high capacity anchoring connections makes possible the creation of building superstructures having eight and potentially more storeys even in high seismicity regions. However, it is important to emphasise that proper selection of suitable arrangements of shear walls for CLT buildings depends on accurate representation of the semi-rigid behaviors of anchoring connections. The linear dynamic analyses presented here demonstrates the need during engineering seismic design practices to avoid use of FE or other design models which do not explicitly incorporate connection flexibilities while estimating parameters like fundamental periods, base shear and uplift forces, as well as inter-story drift.

scholarly journals Application of Modal-Displacement Based Design Method to Multi-Story Timber Blockhaus Structures

2020 ◽  
Vol 10 (11) ◽  
pp. 3889
Author(s):  
Martina Sciomenta ◽  
Vincenzo Rinaldi ◽  
Chiara Bedon ◽  
Massimo Fragiacomo
Keyword(s):  
Design Method ◽  
Fe Model ◽  
Structural Elements ◽  
Base Shear ◽  
Shear Loads ◽  
Story Drift ◽  
Displacement Based ◽  
Technical Interest ◽  
Wooden Structures

Structures under seismic excitation undergo different inter-story drift levels that can be associated to damage of both structural and non-structural elements, and thus to the expected losses. The Modal-Displacement Based Design (DBD) procedure, in this regard, has been developed to fix major issues of Force Based Design (FBD) approaches, thus to design multi-story buildings in which the inter-story drift can allow one to control damage mechanisms. In this paper, the conventional Modal-DBD methodology is applied to multi-story timber buildings constructed using the Blockhaus technology. Given their intrinsic geometrical and mechanical features (i.e., stacking of logs, door/window openings, gaps and friction mechanisms, etc.), dedicated methods of analysis are required for them, compared to other wooden structures. A three-story case-study Blockhaus system of technical interest is thus presented for the assessment of Modal-DBD calculation steps. As shown, special care must be spent for the selection of convenient inter-story drift limits that in general should reflect the characteristics of the examined structural typology. The backbone parameters are thus collected for each shear-wall composing the 3D Blockhaus building, based on refined Finite Element (FE) analyses of separate log-walls. The overall results of the Modal-DBD process are thus finally assessed by means of a Push-Over (PO) analysis, carried out on a simplified 3D FE model of the examined multi-story structure. The comparison of FE predictions, as shown, demonstrates that reliable estimates can be obtained when the Modal-DBD procedure is applied to timber Blockhaus systems. In particular, base shear loads can be estimated with good accuracy, while the corresponding top displacements are slightly overestimated (with up to +10%–14% the expected values, for the collapse prevention performance level).

Analysis of the Seismic Performance of RC Frame Structures with Different Types of Bracings

2012 ◽  
Vol 166-169 ◽  
pp. 2209-2215
Author(s):  
Zhi Xin Wang ◽  
Hai Tao Fan ◽  
Huang Juan Zhao
Keyword(s):  
Seismic Performance ◽  
Time History ◽  
Steel Tube ◽  
Frame Structure ◽  
Frame Structures ◽  
Finite Element Models ◽  
Base Shear ◽  
Concrete Filled Steel Tube ◽  
Different Types ◽  
Rc Frame Structures

Finite element models of frames with steel-bracings and with concrete filled steel tube struts are built in ETABS. Seismic performance of these models is analyzed with base-shear method, superposition of modal responses method and time history method respectively. The results show that the steel-bracings or concrete filled steel tube struts are efficient to increase the story-stiffness, and the top displacement of the frame structure decreases significantly.

scholarly journals Country-scale InSAR monitoring for settlement and uplift damage calculation in architectural heritage structures

2020 ◽  
pp. 147592172094212
Author(s):  
Anastasios Drougkas ◽  
Els Verstrynge ◽  
Koenraad Van Balen ◽  
Michal Shimoni ◽  
Thibauld Croonenborghs ◽  
...  
Keyword(s):  
Ground Movement ◽  
Analytical Models ◽  
Building Structures ◽  
Architectural Heritage ◽  
Damage Classification ◽  
General Applicability ◽  
Combined Use ◽  
Building Geometry ◽  
Different Types ◽  
The Common

The article proposes a methodology for assessing the development of damage in building structures, subjected to differential settlement and uplift, using the analysis of Interferometry Synthetic Aperture Radar (InSAR) data. The proposed methodology is targeted towards general applicability, capable of providing assessment results for measurements over wide geographic areas and for varying structural typologies. The methodology is not limited to ground movement measurements linked to tunnelling, as is the common case. Instead it extends to the monitoring of arbitrary movement in buildings, for example, due to ground consolidation, water table changes or excavation. The methodology is designed for use alongside patrimonial building databases, from which data on individual building geometry and typology are extracted on a region or country scale. Ground movement monitoring data are used for the calculation of the building deformation, expressed in different types of deformation parameters. The combined use of this data with analytical models for settlement damage classification in building structures enables the assessment in patrimonial building structures, at a country scale. The methodology is elaborated and applied on the patrimonial inventory of Belgium for the evaluation of potential settlement and uplift damage on buildings over a period of nearly three decades. The analysis results are compared to on-site observations.

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