Performance Assessment of Mid rise Reinforced Concrete Frame with Shear Wall using pushover analysis
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Date
2017-03
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Addis Ababa University
Abstract
It is difficult to model analytically the complex behaviour of reinforced concrete structure in its non-linear zone. This has led engineers in the past to heavily rely on empirical formulas which were derived from numerous experiments for the design and assessment of reinforced concrete members. It is also used to study the behaviour of reinforced concrete structure of force redistribution. This analysis of non-linear response of reinforced concrete structure is carried out in a routine fashion. It helps in the investigation of the behaviour of the structure under different loading conditions, its load deflection behaviour and crack pattern.
For reinforced concrete structures constructed in seismically active zone, the major cause of failure is ground excitation. This is true because of the unpredictable nature of the seismic excitation or because of proper structural design, detailing and construction. During seismic excitation it is possible to properly estimate the response of structures. For response determination of structures it is difficult to predict the real time response of structure using codes. Therefore, existing performance assessment must be done using a reliable and easily applicable analysis method.
As we know a major change on the expected peak ground acceleration (from 0.05g to 0.1g) shown in the revised Ethiopian building code (EBCS-EN-2014) for Addis Ababa. For the past decade large numbers of buildings are designed and constructed using the old building code. This change highly affects the performance of the structures. Hence, it is mandatory to assess the performance of existing structures using provisions of new code. This case study focuses on forty-sixty living apartames buildings as they are constructed in large scale all over the country and as they are areas where people are congregated. This study is done under the assumption that premature failure is not expected to happen.
This, study makes a comparative study on the effects of shear wall for different structural arrangement over different values of peak ground acceleration.
The three dimensional model for two type of building that is to say one regular and another irregular for G+7 building have been taken as case study where, all result found are three dimensional model result. This is chosen due to the fact that it will give the true picture of the behaviour of the selected building structures.
By Hamza Y. Page II
The analysis of pushover is done using ETABS2016 and SAP2000 (V18) and results has been compared on the displacement, story drift, base shear verses storey height. The performance points and pushover curve are plotted to check the input of new Ethiopian building code provision. The performance level is also computed to compare old and new Ethiopian code provision over the computation between regular and irregular structure over the presence and absence of shear wall.
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Structural Engineering