Wind-uplift fragility analysis of roof sheathing for cultural heritage assets in the Philippines

Abstract

Recent catastrophic events in the Philippines (e.g., the 2013 Typhoon Haiyan) have highlighted that ageing cultural heritage (CH) assets are especially vulnerable to typhoon-induced extreme wind. Non-engineered CH roofs have been recognized as the most vulnerable component in the building envelope due to wind uplift, often resulting in large economic losses and disruption to those assets. Effective prioritization of high-vulnerable structures is a key to effective risk mitigation and resilience-increasing strategies.This paper introduces a simulation-based approach for non-engineered CH roof fragility analysis (i.e., to assess the likelihood of different levels of roof damage over a range of wind hazard intensities) and risk assessment. In the proposed approach, two common failure modes are considered, corresponding to (first) roof-fastener pullout and roof-panel pullover. The overall aim is to identify the highest-risk candidate assets and prioritize more detailed data collection campaigns and structural assessment procedures (e.g., properly accounting for load redistribution and fastener failure progression), and ultimately to plan further repair/strengthening measures.An illustrative application of the proposed procedure is presented with reference to eight priority CH assets in Bohol, the Philippines. The analysis results indicate that, especially for roof panels supported by wood-type purlins, pullout fragility/risk can be significantly high, while the pullover one is generally lower.

Typhoon risk and climate-change impact assessment for cultural heritage asset roofs

“…In general, the fragility curves derived in this study show that CHasset roofs with nails as fasteners are more sensitive to corrosion than the screw ones. The results discussed in this section are in line with those available in the scientific literature for similar roof typologies (e.g., Stewart et al, 2018, Song et al, 2020, thus somehow validating the proposed fragility model. One should note that a validation of the whole procedure in terms of observed losses is unfeasible because of the lack of public data, such as insurance claims.…”

Disaster Risks of the Seven Filipino-Spanish Churches of the Diocese of Maasin, Philippines | Disaster Risks ng Pitong Pilipino-Espanyol na Simbahan ng Diyosesis ng Maasin sa Pilipinas

“…In profiling the storm hazards, this paper took a different approach from those of Song et al (2020), Sevieri et al (2019). As the island of Leyte is located on the eastern part of the Philippine archipelago, its exposure to strong Pacific storms had to be taken as a recurrent threat.…”

Automated Simulation Framework for Urban Wind Environments Based on Aerial Point Clouds and Deep Learning

“…It helps address challenges in climate, energy, health, and safety [1]. Many studies have conducted different forms of wind environmental analysis to study wind-induced disasters and their corresponding risk and economic impact [2,3]. Besides using historical data and empirical models [2,3], computational fluid dynamics (CFD) simulation emerges as an increasingly powerful tool for urban wind environment analysis.…”

“…Many studies have conducted different forms of wind environmental analysis to study wind-induced disasters and their corresponding risk and economic impact [2,3]. Besides using historical data and empirical models [2,3], computational fluid dynamics (CFD) simulation emerges as an increasingly powerful tool for urban wind environment analysis. Existing studies also employed CFD to analyze wind-induced damages towards buildings, trees, and pedestrians [4][5][6].…”