November 24, 2024

Evaluation of Performance-Based Analysis and Design of 44 Stories RC Building Based on EN1998-1 Building Code

Key Points

The findings indicate that nonlinear time history analysis produces higher global responses compared to response spectrum analysis.
Maximum story displacement and shear force parameters are critical for structural performance and were assessed through multiple analysis methods.
Static nonlinear analysis methodologies were utilized to assess the seismic performance of the building in relation to established standards.
The research demonstrates that performance-based design effectively evaluates tall buildings under seismic conditions, impacting future construction practices.

Abstract

Inadequate seismic design regulations have a substantial detrimental influence on the overall performance of a structure. The existing code-based prescriptive reinforced concert design method adopted from developed countries will lead to the failure of structures. Performance-based design (PBD) is a seismic design approach widely used to assess existing buildings and earthquakes for various tall buildings. In this paper, the seismic performance of 3D reinforced concrete models designed per Ethiopian ES8-15 complies with the standards of Eurocode 8-2004 (based on EN1998-1) earthquake code recommendations. This study used sample linear and nonlinear models of 44 stories. It is located In Ethiopia's capital city, Addis Ababa. RC properties are analysed with ETABS vs. 19 software. Response Spectrum Analysis (RSA), Linear Dynamic Time History Analysis (LDTHA) and Classical Modal Analysis with eleven ground accelerations selected from the PEER website. To scale the selected ground motions with target response spectrum as per ES8-15 elastic spectrum type I, both SeismoMatch and ETABS vs. 19.0.0 software were used. The comparison parameters include maximum story displacement, inter-story drift ratios, shear force, overturning moments, and the fundamental period of the buildings for 1st and higher modes. As per Classical Modal Analysis, RSA and LDTHA analysis results of the sample linear 44-story building were found. The result shows that the four global responses of the structure are higher for LDTHA than for the RSA analysis result. The static nonlinear analysis (pushover) methodologies of FEMA 356, ASCE 41-17, and ATC 40 requirements are used to assess their seismic performance. In addition, Nonlinear Time History Analysis (NLTHA) is used to verify the Static Pushover Analysis (SPO) results. The stiffness of the model, the performance levels LS, IO, CP, the target displacement, and the patterns of the plastic hinges are the areas of comparison. The results show that the structures' global and local performance is very similar. Despite this, there were a few notable inconsistencies with sheer force and overturning moment capacity results for future earthquake assessment. The study highlighted the benefits of all analysis types except ELF for future research. This comprehensive research process instils confidence in the validity and reliability of our findings.

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Cite This Study

Mistreselasie Abate (Sun,) studied this question.

synapsesocial.com/papers/68af6595ad7bf08b1eae53f6 https://doi.org/https://doi.org/10.71427/iccpmce2024/41

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