Seismic performance of precast hollow-core floors: Part 2-assessment of existing buildings
Journal
ACI Structural Journal
Journal Volume
118
Journal Issue
5
Pages
65-77
Date Issued
2021
Author(s)
Abstract
Past research has indicated that precast concrete hollow-core floors in buildings are susceptible to non-ductile failure modes when subjected to earthquake deformations. While this research has led to the development of more robust connection details suitable for hollow-core floors in new buildings, the existing building stock with hollow-core floors in New Zealand is still at risk and needs to be assessed. Damage to buildings containing hollow-core floors in Wellington, New Zealand, during the 2016 Kaikoura Earthquake prompted the need to better understand the behavior of hollow-core floors and enable those with limited drift capacity to be retrofitted or replaced. Based on tests described in a companion paper, models are developed for three potential failure modes: Loss of seating (LoS), positive moment failure (PMF), and negative moment failure (NMF). Implementation of these models in the New Zealand Seismic Assessment Guidelines is discussed. Applying the Guidelines to a database of 112 existing buildings with hollow-core floor units in Wellington indicates that the most likely mode of failure is loss of seating. ? 2021, American Concrete Institute.
Subjects
Floor diaphragm
Hollow-core floors
Precast concrete
Seismic assessment
Buildings
Earthquakes
Floors
Risk assessment
Building stocks
Connection details
Ductile failures
Floor diaphragms
Hollow core floors
In-buildings
New zealand
Pre-cast
Seismic Performance
SDGs
Type
journal article