Better-informed decision making for stakeholders towards improved seismic performance of buildings

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Uma, S.R.; Nayyerloo, M.; Canessa, S. 2016 Better-informed decision making for stakeholders towards improved seismic performance of buildings. Lower Hutt, N.Z.: GNS Science. GNS Science report 2016/24 iii, 26 p.

Abstract: Performance-based earthquake engineering (PBEE) aims to deliver building systems that satisfy expectations of the stakeholders in terms of building performance while considering factors other than just life safety such as cost and downtime in the event of an earthquake. Common stakeholders involved in deciding on expected building performance include building owner/developer, engineer and architect. While the building owner/developer will generally be more pivotal on the cost aspect, the engineer and the architect are responsible for delivering the ‘best-fit building system’ that can satisfy seismic performance/design objectives subjected to various constraints including cost. Hence, the challenges of PBEE involve considering multiple criteria of different stakeholders involved in the process of decision making and also their preferences in delivering the ‘best-fit’ system for the purpose intended. The research significance of the current study is to develop framework and simple tools for stakeholders to support decision making process and to contribute towards implementation of PBEE. While there are numerous and varied interests for stakeholders in seismic performance expectations of buildings, this report discusses primarily two important aspects: (i) selecting a suitable building system that can satisfy client’s interest and meets seismic performance objectives; (ii) understanding the influence of extent of damage on downtime on the type of recovery and the building occupancy status post an event. First, in selecting a ‘best-fit’ building system, an online interactive support tool is developed based on a simple yet powerful multiple-criteria decision making (MCDM) approach. The tool aims to facilitate dialogues between the building owner/developer and the engineers at conceptual stages of design where multiple criteria that are relevant in decision making are considered to compare and choose the ‘best-fit’ building system. Next, the report discusses on a recently developed framework for resilient-based earthquake design of buildings (an extension of PBEE) that gives importance to the type of recovery representing different levels of building occupancy post an event. The current study presents a computational tool built on the resilience-based framework to capture the user’s data on probable repair time for damaged components in a building and additional time delays due to impeding factors such as financing and contractor mobilisation that could be involved in the process of repair, and computes the expected downtime for the type of recovery desired by the client. The output of the tool will provide an indication of total downtime, which is seemingly becoming the most important factor for the clients in making decisions for choosing appropriate: (i) building systems and components; and (ii) risk transfer mechanisms such as insurance and other preparatory measures. The report explains the assumptions involved, procedure adopted followed with com ments on the benefits and limitations. (auth)