Time History Analysis of G+15 RCC Building at Different Earthquake Location

Abstract

Now a days multi-storey buildings is the most common word in the construction source, then study of earthquake and analysis of building using earthquake data essential for future safety. In the present paper study of nonlinear dynamic analysis of G+15 storied RCC building considering different locations is carried out and seismic responses of such building are studied. The building under consideration is modelled with the help of Staad Pro software. Three different earthquake data have been used considering at different locations for establishment of relationship between time vs acceleration graphs. The results of the study Shows similar variations pattern in Seismic responses such as base shear and storey displacements, base shear value calculate manually and compare with software value From the study it is recommended that analysis of multi storied RCC building using Time History method becomes necessary to ensure safety against earthquake force.

Introduction

I. INTRODUCTION

All over world, there is high demand for construction of tall buildings due to increasing urbanization and  population, and earthquakes have the potential for causing the greatest damages to those tall structures. Since earthquake forces are random in nature and unpredictable, the engineering tools need to be sharpened for analysing structures under the action of these forces. Earthquake loads are required to be carefully modelled so as to assess the real behaviour of structure with a clear understanding that damage is expected but it should be regulated. Analysing the structure for various earthquake intensities and checking for multiple criteria at each level has become an essential exercise for the last couple of decades. Earthquake causes different shaking intensities at different locations and the damage induced in buildings at these locations is also different.

Static Analysis, Nonlinear Static Analysis, Linear Dynamic Analysis; and  Nonlinear Dynamic Analysis. Linear static analysis or equivalent static method can be used for regular structure with limited height. Linear dynamic analysis can be performed by response spectrum method. The significant difference between linear static and linear dynamic analysis is the level of the forces and their distribution along the height of structure. Nonlinear static analysis is an improvement over linear static or dynamic analysis in the sense that it allows inelastic behaviour of structure. A nonlinear dynamic analysis is the only method to describe the actual behaviour of a structure during an earthquake. The method is based on the direct numerical integration of the differential equations of motion by considering the elastic-plastic deformation of the structural element.

II. METHODOLOGY

The methodology adopted for this study is, first modeling the considered structure in STAAD .Pro. software and analyzing the same by Time History Method of analysis of different  earthquake functions Bhuj and Nepal.. Time history analysis of G+15 building structure is the basic need of this project. analysis of a seismic behavior of an structure is a need of concern, and thereby establishing a comparison between structures at different locations.

1. Collected  earthquake data of Bhuj , Nepal and Uttarkashi related with project topic Time history analysis of building.
2. In the present study, analysis of G+15 multi-story building for dead load and live load and structural modelling of 30m X 30m X 60m, building is carried out.
3. Input the dimensions of building along X, Y, Z direction and no. of bays along these three axes.
4. 3D model is prepared for G+15 multi-story building using STAAD. Pro.
5. Define and assigning the properties of structure like beam, column, supports and plate  
6. Analysis and designing the structure with zero errors and warnings. determining the area of reinforcement using IS CODE 456 :2000.
7. Comparing the result of models by applying different earthquake data time vs displacement , time vs velocity and time vs acceleration.

III. LITERATURE SURVEY

Akita and Kuramoto (2008) Studied related with  the higher mode responses in evaluating the responses of the multi-story irregular-shaped buildings consisting of mixed soft and rigid stories in which the story collapse mechanism is formed under earthquake motions. Therefore, the applicability of the proposed method for the irregular-shaped buildings was investigated in this paper. The modified method using the equivalent participation vector of the dominant higher mode for evaluating the time history responses of the inter-story shear and drift is proposed. The results showed that the predicted the time history responses of the inter-story shear and drift by the modified method has good agreement with the time history analysis result.

Patil (2013) Studied nonlinear dynamic analysis of Ten storied RCC building considering different seismic intensities is carried out and seismic responses of such building are studied. The building under consideration is modeled with the help of SAP2000-15 software. Five different time histories have been used considering seismic intensities V, VI, VII, VIII, IX and X on Modified Mercalli's Intensity scale (MMI) for establishment of relationship between seismic intensities and seismic responses. The result of the study shows similar variations pattern in Seismic responses such as base shear and storey displacements with intensities V to X. From the study it is recommended that analysis of multistoried RCC building using Time History method becomes necessary to ensure safety against earthquake force

Harshita et al. (2014) studied the dynamic behavior of multistoried symmetrical building frame using IS1893- 2002 code recommended response spectrum method and time history method. The time history analysis, two earthquake data such as from previous earthquakes corresponding to Bhuj (2001) and Spitak (1988). Study focuses to evaluate the base shear, response spectra at different story levels, bending moment diagram, shear force diagram variation in the building. Analysis has been carried out using the STAAD-PRO software based on the matrix analysis. Based on the result it is found that the base shear obtained from time history analysis is slightly higher compared to response spectrum analysis, this may be due to variation in amplitude and frequency content of the ground motion.

Rathod and Gupta .(2020) studied about time history and describe the result of the time history analysis on the ten storey structure. Earthquake occurred in multistoried building shows that if the structures are not well designed and constructed with and adequate strength it leads to the complete collapse of the structures. To ensure safety against seismic forces of multi-storied building hence, there is need to study of seismic analysis to design earthquake resistance structures. The main parameters of the seismic analysis of structures are load carrying capacity, ductility, stiffness, damping and mass. The various response parameters like base shear, storey drift, storey displacements etc are calculated.

A. Nonlinear Dynamic Analysis

It is known as Time history analysis. It is an important technique for structural seismic analysis especially when the evaluated structural response is nonlinear. To perform such an analysis, a representative earthquake time history is required for a structure being evaluated. Time history analysis is a step-bystep analysis of the dynamic response of a structure to a specified loading that may vary with time. Time history analysis is used to determine the seismic response of a structure under dynamic loading of representative earthquake .

Following are the design IS codes

(i) IS 456: 2000 – plain and reinforced concrete – code of practice (fourth revision)

(ii) Loading standard codes The loads to be considered for structural design are specified in the following loading standards: IS 875 (Part 1 to 5) : 1987 – code of practice for design loads (other than earthquake) for buildings and structures (second revision).

Part – 1: Dead loads

Part – 2: Imposed (Live) loads

Part – 3: Wind loads

Part – 4: Snow loads

Part – 5: Special loads and load combinations

(iii) IS 1893: 2002 – criteria for earthquake resistant design of structure (fourth revision).

B. Modeling in staad. Pro software

STAAD. pro is a computer-aided engineering software tool used mostly by structural, civil engineers, and architects which is originally pioneered and developed by Research Engineers International in the year 1997. Research Engineers international was duly bought by Bentley in the year 2005. This software has robust visualization structural analysis and design features and functionalities for dynamic analysis and design of any engineering structures including plants, metro stations, wastewater treatment plants, buildings, bridges, towers, tunnels, industrial structures, etc

Conclusion

1) Time history analysis can also provide valuable information on the performance of different structural components and systems under dynamic loads. By analysing the response of individual components, engineers can identify areas that may need to be reinforced or redesigned to improve the overall performance of the structure. 2) Another important conclusion from time history analysis is the importance of accurate modelling and simulation. Inaccurate or incomplete models can lead to incorrect predictions of the behaviour of a structure under dynamic loads, which can have serious consequences for its performance and safety 3) In conclusion, time history analysis is an important tool for understanding the dynamic behavior of structures under seismic, wind, or other types of dynamic loads. By providing insights into the behavior of structures under different conditions, it can help engineers and researchers design safer and more resilient structures. 4) According to results of THA, the storey shear force was found to be maximum for the first storey and it decreased to a minimum in the top storey in all cases. 5) According to results of THA, it was found that mass irregular building frames experience larger base shear than similar regular building frames. 6) According to results of THA, the stiffness irregular building experienced lesser base shear and has larger inter storey drifts.

References

[1] Akita and Kuramoto (2008) “Time History Response Prediction For Multi-Story Buildings Consisting Of Mixed Soft And Rigid Stories Under Earthquake Motions”, The 14 th World Conference on Earthquake Engineering Beijing, China, Vol. [2] Chandrakar , and Bokare (2017) A Review – “Comparison between Response Spectrum Method and Time History Method for Dynamic Analysis of Multistoried Building”, International Journal of Science and Research (IJSR),Vol. 6 ,pp 244-247 [3] Desai (2021) “Time History Analysis and Design of Multistoreyed Building”, International Journal of Research in Engineering and Science (IJRES) ,Vol. 9 PP. 38-43 [4] Juni (2017) “ Nonlinear Dynamic Time History Analysis of Multistoried RCC Residential G+23 Building for Different Seismic Intensities “, International Journal of Engineering Research & Science (IJOER) ,Vol . [5] Mishra and Singh (2022) “Non-Linear Time History Analysis of G+15 RC Frame Building with Shear Wall” , International Journal for Research in Applied Science & Engineering Technology (IJRASET), Vol. 10, pp 1074-1083. [6] Mounica (2018) “Analysis of (g+10) multistorey building with the effect of soft story by time history method” Indian J.Sci.Res. Vol 2, pp 298-310 [7] Patil (2013) “Time history analysis of multistoried rcc buildings for different seismic intensities” ijscer Vol. 2, pp 194-201 [8] Rathod and Gupta (2020) “A Nonlinear Time History Analysis Of Ten Storey Rcc Building “ , International Research Journal of Engineering and Technology (IRJET), Vol 7,pp 7153-7160 [9] https://www.strongmotioncenter.org/ [10] IS 456 : 2000 , [11] IS 875 (1987) , [12] IS 1893 : 2002

Copyright

Copyright © 2023 Raj M. Bawane , Yomish N. Sakhare, Pavan S. Rathod, Pallavi A. Barai, Alisha Sheikh, Assistant Prof. Sagar Doye. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.