Toward multivariate fragility functions for seismic damage and loss estimation of high‐rise buildings

Abstract

Data‐driven models for seismic damage and loss assessment of buildings have become more common in recent years due to the availability of large repositories of recorded and synthetic ground motions coupled with structural response simulation data. This paper explores the benefits of using bivariate and multivariate fragility functions to estimate earthquake‐induced damage and economic loss in high‐rise buildings. The dataset used in this study encompasses 15,000 simulations of modern high‐rise reinforced concrete shear wall buildings ranging from eight to 24 stories which are subjected to ground motion records at five different intensity levels. The proposed functions are conditioned on average spectral accelerations and ground motion significant duration. The results indicate that bivariate fragility functions improve damage state prediction success (Brier score) by 16%, and multivariate fragility functions by 24% relative to conventional univariate functions (standard of practice). To develop multivariate functions, nominal and ordinal probit regression models are fit to the dataset. While both models yield satisfactory predictive performance, ordinal functions can lead to a 15% reduction in misclassified collapse instances, that is, the minority class. Univariate functions tend to overestimate seismic losses at lower intensity levels while underestimating them at higher intensities. These loss estimates are significantly improved when bivariate or multivariate building fragility functions are used. Given the increase in the use of physics‐based ground motion simulations and/or multi‐variate ground motion models, from which multiple intensity measures can be extracted, a shift toward a more complex representation of fragility functions, for example, multivariate curves, is necessary and inevitable. The proposed functions are used to evaluate the performance of a portfolio of modern high‐rise reinforced concrete shear wall buildings at four sites across the Seattle, Washington metropolitan area under a potential magnitude‐9 Cascadia subduction zone earthquake scenario. The results indicate that the proposed functions can be beneficial in enhancing damage state predictions and loss estimates at a regional scale.

Dilema Perizinan Alih Fungsi Bangunan Rumah Dinas TNI di Era Otonomi Daerah

“…Mendirikan bangunan merupakan salah satu kegiatan untuk mendirikan, memperbarui dan memperluas bangunan rumah maupun bangunan gedung dirubah menjadi sebuah tempat yang memungkinkan bisa dipakai untuk segala hal (Laurent, 2018;Simões, 2021;Zuccaro, 2021). Izin mendirikan bangunan merupakan suatu izin yang telah diberikan dari Pejabat atau pemerintah daerah kepada pemilik bangunan untuk mendirikan, memperbarui dan memperluas bangunan rumah maupun bangunan gedung yang sesuai dengan persyaratan dokumen secara administrative maupun teknis (Böke, 2020;Kourehpaz, 2023;Nollet, 2018). Adanya izin mendirikan bangunan ini agar memberikan kelayakan kehidupan masyarakat sekitar yang nyaman, aman dan tertib dalam keberlangsungan ekonomi yang baik di suatu kegiatan seperti tempat usaha maupun lainnya (Gautam, 2018(Gautam, , 2018Zhuo, 2019).…”

Feature selection of ground motion intensity measures for data‐driven surrogate modeling of structures

“…However, previous data-driven seismic damage assessment of structures commonly employed lower-dimensional combinations of IMs. [32][33][34] This is because the majority of studies only suggest a single optimal IM, [35][36][37][38] constrained by the fact that linear regression model is built based on individual IM. Even the recommendation of optimal multiple IMs still depends on the ranking of selection criteria for each IM.…”