Seismic vulnerability assessment of a high-rise molten-salt solar tower based on incremental dynamic analysis

This paper investigates the seismic performance of a high-rise molten-salt solar tower by finite element modelling. The integrated and separated models for solar tower based on the concrete damage plastic model are validated by matching the behaviour of similar reinforced concrete chimney specimens. The modal analysis demonstrates the first four modes of the solar tower are translational vibration. Seismic simulations are developed through the incremental dynamic analysis. The most disadvantageous position of the tower is all concentrated in the opening section under multidirectional seismic excitations. The top displacement of the tower under bidirectional and three-directional earthquake actions is larger than that under unidirectional earthquake actions. The results of the seismic vulnerability assessment show that when the PGA equals to 0.035g, the tower will be intact; when the PGA equals to 0.1g (design peak ground acceleration), the probability of the moderate damage state is within 1.5%; when the PGA equals to 0.22g (maximum considered earthquake), the probability of the destruction state is below 0.7%. The seismic partitioned fragility analysis of the tower under multidirectional earthquake excitations illustrates that there are two peaks in the vulnerability surfaces. The anti-collapse analysis indicates the tower has a good seismic performance under multidirectional seismic excitations.

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Seismic vulnerability assessment of multi-storey subway station structure

E3S Web of Conferences ◽

10.1051/e3sconf/202129302030 ◽

2021 ◽

Vol 293 ◽

pp. 02030

Author(s):

Tong Liu ◽

Zhixin Li ◽

Qinghe Wang ◽

Huaiyu Xu

Keyword(s):

Finite Element ◽

Dynamic Analysis ◽

Vulnerability Assessment ◽

Seismic Vulnerability ◽

Incremental Dynamic Analysis ◽

Seismic Intensity ◽

Normal Operation ◽

Subway Station ◽

Seismic Vulnerability Assessment ◽

Station Structure

The safety of underground structure under seismic load is an important basis of the normal operation of underground rail transit system. Structural seismic vulnerability assessment based on incremental dynamic analysis method can evaluate the probability of the structure exceeding a certain limit state under a specific seismic intensity in terms of probability. In this paper, the seismic vulnerability of a multi-storey subway station structure is evaluated using this method, and a two-dimensional finite element model of both soil and structure is established by finite element software ABAQUS. The vulnerability curve is obtained through incremental dynamic analysis and mathematical statistics. Based on this curve, the probabilities of the structure exceeding four seismic limit states are obtained under the design seismic intensity and the rarely occurred seismic intensity at 7 degree. Results show that this station may attain slight damage under design seismic intensity of 7 degree, and may attain life safety at the rarely occurred seismic intensity at 7 degree.

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Seismic Vulnerability Assessment and Mapping of Gyeongju, South Korea Using Frequency Ratio, Decision Tree, and Random Forest

Sustainability ◽

10.3390/su12187787 ◽

2020 ◽

Vol 12 (18) ◽

pp. 7787 ◽

Cited By ~ 1

Author(s):

Jihye Han ◽

Jinsoo Kim ◽

Soyoung Park ◽

Sanghun Son ◽

Minji Ryu

Keyword(s):

Random Forest ◽

Decision Tree ◽

South Korea ◽

Vulnerability Assessment ◽

Seismic Data ◽

Frequency Ratio ◽

Seismic Vulnerability ◽

Success Rates ◽

Ground Acceleration ◽

Seismic Vulnerability Assessment

The main purpose of this study was to compare the prediction accuracies of various seismic vulnerability assessment and mapping methods. We applied the frequency ratio (FR), decision tree (DT), and random forest (RF) methods to seismic data for Gyeongju, South Korea. A magnitude 5.8 earthquake occurred in Gyeongju on 12 September 2016. Buildings damaged during the earthquake were used as dependent variables, and 18 sub-indicators related to seismic vulnerability were used as independent variables. Seismic data were used to construct a model for each method, and the models’ results and prediction accuracies were validated using receiver operating characteristic (ROC) curves. The success rates of the FR, DT, and RF models were 0.661, 0.899, and 1.000, and their prediction rates were 0.655, 0.851, and 0.949, respectively. The importance of each indicator was determined, and the peak ground acceleration (PGA) and distance to epicenter were found to have the greatest impact on seismic vulnerability in the DT and RF models. The constructed models were applied to all buildings in Gyeongju to derive prediction values, which were then normalized to between 0 and 1, and then divided into five classes at equal intervals to create seismic vulnerability maps. An analysis of the class distribution of building damage in each of the 23 administrative districts showed that district 15 (Wolseong) was the most vulnerable area and districts 2 (Gangdong), 18 (Yangbuk), and 23 (Yangnam) were the safest areas.

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Large-Scale Seismic Vulnerability Assessment Method for Urban Centres. An Application to the City of Florence

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.628.49 ◽

2014 ◽

Vol 628 ◽

pp. 49-54 ◽

Cited By ~ 2

Author(s):

Maurizio Ripepe ◽

Giorgio Lacanna ◽

Pauline Deguy ◽

Mario de Stefano ◽

Valentina Mariani ◽

...

Keyword(s):

Vulnerability Assessment ◽

Large Scale ◽

Seismic Vulnerability ◽

Risk Mitigation ◽

Structural Features ◽

Assessment Method ◽

Ground Acceleration ◽

Seismic Vulnerability Assessment ◽

Damage Scenarios ◽

The City

The seismic vulnerability assessment of a building requires a comprehensive knowledge of both building structural features and soils geophysical parameters. To achieve a vulnerability assessment at the urban scale a large amount of data would be necessary, with a consequent involvement of time and economical resources. The aim of this paper is hence to propose a simplified procedure to evaluate the seismic vulnerability of urban centres and possible seismic damage scenarios in order to identify critical areas and/or building typologies to plan future actions of seismic risk mitigation and prevention. The procedure is applied to the outstanding case study of the city of Florence. The research is based on the definition of major building typologies related to construction periods and type of the structural system (masonry or reinforced concrete), the identification of a set of sample buildings, the analysis of the dynamic behaviour and the evaluation of a vulnerability index with an expeditious approach. The obtained results allow to define potential vulnerability and post-event damage scenarios related to the expected levels of peak ground acceleration.

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Empowering the Indiana Bridge Inventory Database Toward Rapid Seismic Vulnerability Assessment

10.5703/1288284317282 ◽

2021 ◽

Author(s):

Leslie Bonthron ◽

Corey Beck ◽

Alana Lund ◽

Farida Mahmud ◽

Xin Zhang ◽

...

Keyword(s):

Seismic Performance ◽

Asset Management ◽

Vulnerability Assessment ◽

Seismic Vulnerability ◽

Seismic Analysis ◽

Dynamic Assessment ◽

The State ◽

Assessment Procedure ◽

Seismic Zone ◽

Seismic Vulnerability Assessment

With the recent identification of the Wabash Valley Seismic Zone in addition to the New Madrid Seismic Zone, Indiana’s Department of Transportation (INDOT) has become concerned with ensuring the adequate seismic performance of their bridge network. While INDOT made an effort to reduce the seismic vulnerability of newly-constructed bridges, many less recent bridges still have the potential for vulnerability. Analyzing these bridges’ seismic vulnerability is a vital task. However, developing a detailed dynamic model for every bridge in the state using information from structural drawings is rather tedious and time-consuming. In this study, we develop a simplified dynamic assessment procedure using readily-available information from INDOT’s Bridge Asset Management Program (BIAS), to rapidly identify vulnerable bridges throughout the state. Eight additional data items are recommended to be added into BIAS to support the procedure. The procedure is applied in the Excel file to create a tool, which is able to automatically implement the simplified bridge seismic analysis procedure. The simplified dynamic assessment procedure and the Excel tool enable INDOT to perform seismic vulnerability assessment and identify bridges more frequently. INDOT can prioritize these bridges for seismic retrofits and efficiently ensure the adequate seismic performance of their assets.

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Seismic Vulnerability Assessment of a Reinforced Concrete Building Located in India

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.k1059.09811s19 ◽

2019 ◽

Vol 8 (11S) ◽

pp. 310-314

Keyword(s):

Vulnerability Assessment ◽

Seismic Vulnerability ◽

Fragility Curves ◽

Equivalent Linearization ◽

Spectral Acceleration ◽

Damage State ◽

Ground Acceleration ◽

Seismic Vulnerability Assessment ◽

Performance Point ◽

Damage States

Over the recent years the natural disaster especially due to the earthquake effect on buildings increases which causes loss of life and property in many places all over the world. The latest development leads to finding the direct losses and damage states of the buildings for various intensities of earthquake ground motions. In the present study, seismic vulnerability assessment was done for a medium rise building (G+5). The design peak ground acceleration of 0.16g and 0.36g were considered for the risk assessment. The nonlinear static pushover analysis was done to fine the performance point, spectral acceleration and corresponding spectral acceleration by Equivalent Linearization (EL) method given by Federal Emergency Management Agency (FEMA-440). The four damage states such as slight, moderate, extreme and collapse has been considered as per HAZUS-MR4. The seismic vulnerability in terms of fragility curves was developed to evaluate the damage probabilities based on HAZUS methodology. The discrete and cumulative damage probability was found for all the damage states of the building which shows the building at 0.16g experience slight damage whereas at 0.36g the moderate damage state equally becomes predominant.

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Bidirectional Energy-based Pushover Procedure as a Fast Approach to Establish Approximate IDA Curves under Biaxial Seismic Excitations: An Evaluation for Medium- and High-rise Buildings

10.21203/rs.3.rs-467175/v1 ◽

2021 ◽

Author(s):

Sahman Soleimani ◽

Abdolreza Sarvghad Moghadam ◽

Armin Aziminejad

Keyword(s):

Dynamic Analysis ◽

Ground Motions ◽

Structural Models ◽

Incremental Dynamic Analysis ◽

Seismic Excitations ◽

High Rise ◽

Asymmetric Buildings ◽

Fast Approach ◽

Unique Approach ◽

Similar Accuracy

Abstract Bidirectional energy-based pushover (BEP) procedure is expanded in this paper to predict approximate incremental dynamic analysis (IDA) results of medium- and high-rise structures. BEP is a unique approach in the sense that it provides approximate IDA curves under the simultaneous effect of two horizontal components of ground motions and is applicable to both symmetric- and asymmetric-plan buildings. The method has already proved to be useful in low-rise buildings, and this study aims to evaluate its suitability for mid- and high-rise structures. Six structural models were considered in this evaluation in two groups of 9- and 20-story buildings, with each group consisting of a symmetric, a one-way asymmetric, and a two-way asymmetric-plan building. The results revealed that the method was sufficiently accurate to provide approximate IDA curves for all structural models. The method had similar accuracy in the asymmetric models as it did in the symmetric models, although the accuracy slightly decreased as the height of the building increased. BEP also provided good estimates of the demands in both ‘flexible’ and ‘stiff sides’ of the asymmetric buildings as well as the demands over the height of the buildings.

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Seismic Vulnerability Assessment using Numerical Simulation for a Residential Buildings – A Case study

10.21203/rs.3.rs-70268/v1 ◽

2020 ◽

Author(s):

Jennifer Mehjebin ◽

Santhi A.S ◽

Ganapathy Pattukandan Ganapathy

Keyword(s):

Seismic Performance ◽

Vulnerability Assessment ◽

Structural Damage ◽

Seismic Vulnerability ◽

Residential Buildings ◽

Shear Wall ◽

Static Force ◽

Seismic Vulnerability Assessment ◽

Ground Floor ◽

Soft Storey

Abstract Seismic vulnerability assessment of an existing building is of high importance for ensuring the safety of the structure and the occupants. An earthquake may not be predictable but seismic performance of a structure can be well- predicted in advance which aids in deciding the correct retrofit technique for a building ensuring the safety of the occupants. A RC building situated in the seismic zone III region of Vellore, Tamil Nadu has been taken into consideration for analysing its seismic vulnerability. The region is yet to catch engineering attention for evaluation of seismic performance of such buildings. With the help of the nearest fault line data, the PGA value was calculated and the value suggested moderate potential damage. The RVS score of the building was categorised in the high probability of Grade Damage 3 i.e. structural damage in moderate range and non-structural damage in heavy range. A detailed numerical analysis was carried out in ETABS using equivalent static force method to simulate the earthquake forces in the structure. Although a dynamic method of analysis considers higher magnitude of earthquake forces based on a more realistic earthquake excitation, equivalent static force analysis is sufficient for a preliminary analysis of the building. The building having a soft storey in the ground floor showed variations in its behaviour on application of earthquake forces in four different case scenarios of shear wall application. The maximum storey drifts were then compared for the building in cases of existing soft storey and with the application of shear wall in the ground floor, staircase walls and with a combination of shear wall in both the locations. The results showed that shear wall in the staircase proved to be the most economical retrofit solution for the building.

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Application of Incremental Dynamic Analysis (IDA) Method for Studying the Dynamic Behavior of Structures During Earthquakes

Engineering, Technology & Applied Science Research ◽

10.48084/etasr.902 ◽

2017 ◽

Vol 7 (1) ◽

pp. 1338-1344

Author(s):

M. Javanpour ◽

P. Zarfam

Keyword(s):

Dynamic Analysis ◽

Structural Engineering ◽

Seismic Vulnerability ◽

Steel Structure ◽

Steel Structures ◽

Incremental Dynamic Analysis ◽

Moment Frames ◽

Ground Acceleration ◽

Analysis And Design ◽

Log Normal

Prediction of existing buildings’ vulnerability by future earthquakes is one of the most essential topics in structural engineering. Modeling steel structures is a giant step in determining the damage caused by the earthquake, as such structures are increasingly being used in constructions. Hence, two same-order steel structures with two types of structural systems were selected (coaxial moment frames and moment frame). In most cases, a specific structure needs to satisfy several functional levels. For this purpose, a method is required to determine the input request to the structures under possible earthquakes. Therefore, the Incremental Dynamic Analysis (IDA) was preferred to the Push-Over non-linear static method for the analysis and design of the considered steel structures, due its accuracy and effect of higher modes at the same time intervals. OpenSees software was used to perform accurate nonlinear analysis of the steel structure. Two parameters (spectral acceleration and maximum ground acceleration) were introduced to the modeled frames to compare the numerical correlations of seismic vulnerability obtained by two statistical methods based on the "log-normal distribution" and "logistics distribution", and finally, the parameters of displacement and drift were assessed after analysis.

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