Assessment of Reinforced Concrete Building for Disaster Reduction Strategy in Padang City, West Sumatra, Indonesia

Eka Juliafad,Annisa Prita Melinda,A Awaludin,H Jonkers,A Fajar Setiawan,K Nur Rahma Putri,T Matsumoto,S Siswosukarto,S Pessiki

doi:10.1051/matecconf/201925803007

Eka Juliafad, Annisa Prita Melinda + Show 7 more

Open Access

https://doi.org/10.1051/matecconf/201925803007

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Abstract

Padang City, West Sumatra province is one of the most vulnerable cities in the west coast of Indonesia. Together with the increase in population in Padang City, the number of the building is also increasing. Meanwhile, researchers predicted that Padang City is facing the impendence of mega-earthquake with magnitude more than 8 in scale Richter (SR). The last Earthquake with magnitude 7.6 SR caused fatality with more than 1200 people died and almost 3000 others were injured. Most of the victims injured due to the collapse and damage of buildings, especially the Reinforced Concrete (RC) structure. To reduce the damage due to seismic load as the preparation for the future earthquake, the assessment of the element at risk subjected to the seismic load in Padang City is essential. The predominant building typology in Padang City is RC building. Using the Applied Element Method that can show structural response till collapse state, has been simulated typical low-rise RC infilled wall building in Padang City with the consideration of its different on concrete quality based on local concreting workmanship. Incremental Dynamic Analysis (IDA) by using some ground motion has been used to observe the structural response. The damage states and damage pattern has been judged based on HAZUS criteria. The results show that local compaction method affected the concrete compression quality, that also influences the building performance which is subjected to earthquake loads.

Highlights

If we relate the differences of building damage level for each concrete strength to the compaction method, the practice to use hummer for external vibration only that can be found as a common practice in the construction field especially low story building will reduce the Reinforced Concrete (RC) building capacity to resist earthquake load significantly
This research finds that local compaction method practice in Indonesia generally can be categorized into three methods: using a vibrator, rodding and hammering
To understand the actual behavior of the existing typical RC building in the seismic prone area such as Padang City, field study to get the real parameter of RC building was conducted

Summary

Introduction

The vulnerability of Infill Masonry RC Building. The earthquake damage records in the last decade, show that Reinforced Concrete (RC) building with infill masonry wall suffered many variations of damage, started from slightly damaged till collapse state (e.g., LAquila 2009 (Ricci et al.2010), Lorca 2011 (Cabanas et al.2011) [1][2] The vulnerability of RC building is a contribution of the uncertainty of concrete execution, high irregularity due to the arrangement of a masonry wall, and the brittle behavior of brick wall material. In the urban area, the population of RC building with infill wall follows the positive trend of its population. If the concrete execution is not adequate, a massive number of RC building in a populated urban area will affect the increasing of the fatality due to earthquake hazards. Majority of buildings suffered significant cracking in masonry infill, and out of plan failure are often observed. The failure due to the development of a plastic hinge at the top and bottoms of the column were majorly found [3]

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