Uncoupled multivariate power models for estimating performance-based seismic damage states of column curvature ductility

Structures ◽  
2022 ◽  
Vol 36 ◽  
pp. 752-764
Author(s):  
Jian Zhong ◽  
Ming Ni ◽  
Huiming Hu ◽  
Wancheng Yuan ◽  
Haiping Yuan ◽  
...  
Keyword(s):  
Seismic Damage ◽  
Curvature Ductility ◽  
Power Models ◽  
Damage States

scholarly journals Nonlinear Dynamic Analysis of Masonry Buildings and Definition of Seismic Damage States

2016 ◽  
Vol 10 (1) ◽  
pp. 192-209 ◽  
Author(s):  
A.J. Kappos ◽  
V.K. Papanikolaou
Keyword(s):  
Fragility Curves ◽  
Pushover Analysis ◽  
Nonlinear Dynamic Analysis ◽  
Critical Issue ◽  
Seismic Damage ◽  
Masonry Building ◽  
Nonlinear Behaviour ◽  
Building Stock ◽  
Damage States ◽  
Diaphragm Action

A large part of the building stock in seismic-prone areas worldwide are masonry structures that have been designed without seismic design considerations. Proper seismic assessment of such structures is quite a challenge, particularly so if their response well into the inelastic range, up to local or global failure, has to be predicted, as typically required in fragility analysis. A critical issue in this respect is the absence of rigid diaphragm action (due to the presence of relatively flexible floors), which renders particularly cumbersome the application of popular and convenient nonlinear analysis methods like the static pushover analysis. These issues are addressed in this paper that focusses on a masonry building representative of Southern European practice, which is analysed in both its pristine condition and after applying retrofitting schemes typical of those implemented in pre-earthquake strengthening programmes. Nonlinear behaviour is evaluated using dynamic response-history analysis, which is found to be more effective and even easier to apply in this type of building wherein critical modes are of a local nature, due to the absence of diaphragm action. Fragility curves are then derived for both the initial and the strengthened building, exploring alternative definitions of seismic damage states, including some proposals originating from recent international research programmes.

scholarly journals Probabilistic Evaluation System of Seismic Damage States for Bridge Structures.

2001 ◽  
Vol 50 (1) ◽  
pp. 32-39
Author(s):  
Akihiko KANEYOSHI ◽  
Ayaho MIYAMOTO ◽  
Hideaki NAKAMURA ◽  
Eiji NAKAYAMA
Keyword(s):  
Evaluation System ◽  
Seismic Damage ◽  
Probabilistic Evaluation ◽  
Bridge Structures ◽  
Damage States

scholarly journals Bridge Seismic Damage Assessment Model Applying Artificial Neural Networks and the Random Forest Algorithm

2020 ◽  
Vol 2020 ◽  
pp. 1-13 ◽  
Author(s):  
Hanxi Jia ◽  
Junqi Lin ◽  
Jinlong Liu
Keyword(s):  
Neural Networks ◽  
Artificial Neural Networks ◽  
Random Forest ◽  
Rapid Assessment ◽  
Seismic Damage ◽  
Assessment Model ◽  
Random Forest Algorithm ◽  
Importance Value ◽  
Damage States ◽  
Artificial Neural

Earthquakes cause significant damage to bridges, which have a very strategic location in transportation services. The destruction of a bridge will seriously hinder emergency rescue. Rapid assessment of bridge seismic damage can help relevant departments to make judgments quickly after earthquakes and save rescue time. This paper proposed a rapid assessment method for bridge seismic damage based on the random forest algorithm (RF) and artificial neural networks (ANN). This method evaluated the relative importance of each uncertain influencing factor of the seismic damage to the girder bridges and arch bridges, respectively. The input variables of the ANN model were the factors with higher importance value, and the output variables were damage states. The data of the Wenchuan earthquake were used as a testing set and a training set, and the data of the Tangshan earthquake were used as a validation set. The bridges under serious and complete damage states are not accessible after earthquakes and should be overhauled and reinforced before earthquakes. The results demonstrate that the proposed approach has good performance for assessing the damage states of the two bridges. It is robust enough to extend and improve emergency decisions, to save time for rescue work, and to help with bridge construction.

scholarly journals A Comparative Test Study on the Seismic Damage Sustained by Frame-Core Tube Structures

2019 ◽  
Vol 2019 ◽  
pp. 1-19
Author(s):  
Zuohua Li ◽  
Liang Chen ◽  
Jun Teng
Keyword(s):  
Seismic Performance ◽  
Seismic Design ◽  
Optimization Model ◽  
Design Method ◽  
Seismic Damage ◽  
Comparative Test ◽  
Core Tube ◽  
Damage States ◽  
The Relationship ◽  
Tube Structure

The overall damage sustained by a structure can be controlled in the current damage-based seismic design, but the rationality of the relationship among the damage states of the components in the structure and the influences of those states on the overall seismic performance of the structure are currently ignored. In response to this problem, a comparative test was performed in this paper to study the seismic damage performances of two frame-core tube structure models, namely, an optimization model designed through the optimization of the component damage states to achieve the relationship among those damage states proposed in this paper and a normative model designed through the seismic design method based on Chinese codes. By comparing the experimental data of these two models, the relationship among the component damage states was discussed comprehensively, and the influences of those states on the overall seismic performance of the frame-core tube structure were analyzed. The proposed relationship among the component damage states in the optimization model can effectively limit the development of overall damage and improve the internal force response of the structure.

scholarly journals Seismic Fragility of Chinese Light-Gauge Steel Keel Gypsum Board Partition Walls

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Duozhi Wang ◽  
Xudong Zhi ◽  
Fangxu Zhu ◽  
Yixing Wang
Keyword(s):  
Failure Mechanisms ◽  
Seismic Damage ◽  
Basic Data ◽  
Seismic Fragility ◽  
Experimental Program ◽  
Engineering Practice ◽  
Gypsum Board ◽  
Nonstructural Components ◽  
Partition Walls ◽  
Damage States

A quasi-static experimental program of light-gauge steel keel gypsum board partition walls (LSKGBPW) was carried out to evaluate the seismic damage phenomena, failure mechanisms, and fragility. The 15 specimens in five groups were designed per current Chinese codes and engineering practice. Then, three damage states were defined based on the damage and repair measures, and the fragility data of each group were presented, providing basic data for the estimation of seismic damage and consequential loss of nonstructural components.

scholarly journals Development of Empirical Fragility Curves in Earthquake Engineering considering Nonspecific Damage Information

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Jung J. Kim
Keyword(s):  
Earthquake Engineering ◽  
Fragility Curves ◽  
Evidence Theory ◽  
Possibility Theory ◽  
Seismic Damage ◽  
Damage State ◽  
Lognormal Distributions ◽  
Damage States ◽  
Damage Data ◽  
Conservative Estimation

As a function of fragility curves in earthquake engineering, the assessment of the probability of exceeding a specific damage state according to the magnitude of earthquake can be considered. Considering that the damage states for fragility curves are generally nested to each other, the possibility theory, a special form of the evidence theory for nested intervals, is applied to generate fragility information from seismic damage data. While the lognormal distributions are conventionally used to generate fragility curves due to their simplicity and applicability, the methodology to use the possibility theory does not require the assumption of distributions. Seismic damage data classified by four damage levels were used for a case study. The resulted possibility-based fragility information expressed by two monotone measures, “possibility” and “certainty,” are compared with the conventional fragility curves based on probability. The results showed that the conventional fragility curves provide a conservative estimation at the relatively high earthquake magnitude compared with the possibility-based fragility information.

Seismic Damage Analysis of the Teaching Buildings in Leigu Town in the Wenchuan Earthquake

2009 ◽  
Vol 417-418 ◽  
pp. 889-892
Author(s):  
Bai Tao Sun ◽  
Qiang Zhou ◽  
Pei Lei Yan
Keyword(s):  
Comparative Analysis ◽  
Wenchuan Earthquake ◽  
Seismic Behavior ◽  
Seismic Damage ◽  
Great Earthquake ◽  
Damage Analysis ◽  
The Wenchuan Earthquake ◽  
Damage States ◽  
Actual Damage ◽  
Beichuan County

A great earthquake of magnitude 8.0 occurred on May 12, 2008 (Beijing Time) in Wenchuan, Sichuan Province of China. Leigu town, which adjoins Beichuan county, was the most seriously damaged place in this earthquake. The teaching buildings were destroyed severely and the earthquake disaster phenomena is very typical. In this paper, firstly, the characteristics of structures and the earthquake damage of the teaching buildings in Leigu town are introduced in detail. Secondly, their damage states are calculated by means of structure vulnerability analysis, which are used for comparative analysis with actual damage states, and the influencing factors on seismic behavior are analyzed. Finally, some reasonable suggestions on the reconstruction of teaching buildings after disaster have been given.

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