A comparison of retrofitting methods on nursing faculty building of Andalas University with concrete jacketing and shear wall systems

Fauzan Fauzan,Febrin Anas Ismail,Zev Al Jauhari,Oswin Dezardo

doi:10.1051/matecconf/201819502016

Abstract

The Nursing Faculty building is one of the buildings that fulfill the administrative eligibility in Andalas University, Padang - Indonesia, which was designed by a building design consultant based on the Indonesian standard code. During the building construction, the concrete quality was found to not to be in accordance with the designed concrete quality and construction was terminated by the owner. A structural evaluation of the building is carried out based on the Indonesia seismic code SNI 2847:2012. The results show that the building is not strong enough to withstand the combination of the loads acting on the structure, especially an earthquake load. Two methods were proposed to retrofit the building; by increasing the dimensions of the cross-section and add reinforcement to the structural elements (jacketing) and by adding some structural wall at the site of the plan with the aim to rigidify the building (shear wall). It is found that the two retrofitting methods are effective in reducing the internal forces and displacement on the building structures and the building is capable of resisting the working loads. Comparing the two retrofitting methods, the concrete jacketing column is more cost-effective than the shear wall method.

Highlights

Andalas University is a great university located in Padang City, West Sumatera Province, Indonesia, which is in the high seismic region
This study focuses on the seismic evaluation of the existing building structure and retrofitting of a two-story RC building designed by two loads design philosophies i.e. SNI 1726:2012 [6] and SNI 1727:2013 [7], along with a concrete detailing as per SNI 2847:2013 [8]
The analysis of cross-sectional capacity in the structural element is done by comparing the maximum internal forces. 2.3.1 Load-bearing capacity of the existing structure The analysis of the capacity of the beam uses the largest cross-section and the longest span one, and the capacity is compared to the internal force that occurred due to the working loads

Summary

Introduction

Andalas University is a great university located in Padang City, West Sumatera Province, Indonesia, which is in the high seismic region. The Nursing Faculty is a new faculty at Andalas University, which was established on the 3rd of August 2012. To fulfil the administrative eligibility, a new Nursing Faculty building was built. The building was planned as a two-story reinforced concrete frame structure. It was found that the concrete compressive strength is low (fc’=15 MPa), which does not meet the strength requirement that was designed by the design consultant (fc’=20 MPa). The construction is apparently poor quality, so that the construction was stopped and it cannot be continued. In order to reduce the loss of life and damage to the building when the earthquake occurs, the performance of the structures must be improved by applying seismic retrofitting methods

Methods

Results

Conclusion