Development of fragility curve based on incremental dynamic analysis curve using ground motion Aceh earthquake (original) (raw)
Related papers
E3S Web of Conferences, 2022
Aceh is located on the Indian Ocean Coast which is very prone to Tsunamis, this is due to frequent large earthquakes due to Megatrust faults, such as those that occurred during the earthquake on December 26, 2004. Based on the 2012 Aceh earthquake, the Acehnese prefer horizontal evacuation to vertical evacuation [1]. In this case, many people in Banda Aceh do not believe in the strength of TVE buildings (distrust building). From this research, it it is possible for the Acehnese will do the same thing in the future when the tsunami occurs. Horizontal evacuation puts them at risk of traffic accidents so that they cannot reach a safe area in a short time, whereas through vertical evacuation they can reach the TVE of a building in a short time due to its proximity to settlements. When the earthquake and tsunami occured Banda Aceh in 2004, many buildings were destroyed due to the earthquake load and also the Tsunami load. For this problem, a vulnerability analysis of buildings that can b...
E3S Web of Conferences
Nearly all residential houses were damaged due to 6.5 Mw earthquake in Pidie Jaya, 2016. The state of damage can be slight, moderate, and even can be extensive which lead to the collapsing. The confined masonry structure, which commonly found in Aceh, especially for housing construction, were seemingly prone to the extensive earthquake excitation. In this paper, analytical-based fragility curves are employed to the typical house structure. To account various uncertainty, 32 ground motion records are considered in the analysis. Based on the results, the fragility curve could render different interpretation if different definition of damage intensities is used.
A Review on Earthquake Vulnerability Assessment
2017
Majority of human beings live in earthquake prone areas. Earthquake causes significant loss of life and damage of property every year. It is required to identify the damage of a structure caused due to varying ground motion intensities. This identification results will help an engineer to take necessary action against the after-effects of an earthquake. The vulnerability of a structure has to be found out under various ground motion intensity measures (IM) such as Peak Ground Acceleration (PGA). From this, fragility curves can be developed. Fragility analysis is a probabilistic approach, which is commonly used now-a-days. As per this method, different Damage states (DS) have to be defined and then probable damage of the structure in connection with the IM can be found. Fragility curves are generated from multiple Incremental Dynamic Analysis or IDA curves with the help of traditional curve fitting technique.
Seismic Fragility Assessment of Irregular High Rise Buildings using Incremental Dynamic Analysis
Advances in Engineering and Technology: An International Journal
The construction of high rise buildings is common in city areas. These buildings may be irregular because of aesthetics or other requirements. As Nepal lies in a seismically active region these irregular high rise buildings may not perform well during earthquakes. Two existing irregular high rise buildings are taken as case study buildings that had pre-existing torsion. Shear walls are added to the building at the required location to minimize torsion in the buildings. The objective of the study is to determine the performance of building with and without torsional irregularity. The seismic performance of all the buildings is carried out by taking seven pairs of ground motions using nonlinear time history analysis. These ground motions are scaled to the required intensity to develop incremental dynamic analysis (IDA) curve. These IDA curves are used to develop fragility curves to access the performance in the buildings. The result from the analysis showed that performance in one bui...
Seismic vulnerability analysis
Masonry construction practice has born approximately 10,000 years ago and is the oldest building technique known to man. With time construction practice has been advanced. However, there are still many traditional brick masonry buildings which were constructed locally with mud mortar and burnt clay bricks. Though these buildings have survived for centuries, they lack seismic resistant measures to fight the future severe earthquake hazards. Historical and monumental importance and safety of lives dwelling in those buildings motivates the research study in this field with the aim of their sustainability.
Development of analytical seismic fragility functions for the common buildings in Iran
Bulletin of Earthquake Engineering
One of the main components for the development of regional seismic risk models is the fragility functions for common building types. Due to the differences between the national design codes, construction practices, and construction materials, it is necessary to develop speci c fragility functions for the common building types which are constructed in each region. One of the existing challenges is the lack of classi ed, reliable, and cogent local seismic fragility functions for common buildings in Iran. For this reason, the present study is devoted to lling this essential gap. Therefore, at the rst step, a comprehensive study was performed on the existing building types in the country. Finally, the Iranian common buildings are classi ed into 35 categories regarding material, lateral-loadresisting system, age, height, and code level. Also, by conducting comprehensive studies on all previously performed researches in the country, structural and dynamic parameters have been collected for buildings in each class. This information was used to compute a large set of backbone curves for Iranian buildings taxonomy. In the next steps, a large set of ground motion records were selected. Then non-linear time-history analyses were performed on the generic backbone curve for each type of building, and the structural responses were used to derive fragility functions for building classes. Then nearly three hundred appropriate fragility functions were generated for Iranian common buildings considering both record-to-record and building-to-building response variability using cloud analysis. Based on the existing empirical data from past earthquakes in the country, the validation of the resulting fragility functions was carried out. The resulted fragility functions can be utilized in seismic risk assessment studies in the country.
2014
Empirical fragility functions are derived by statistical processing of the data on: i) Damaged and undamaged buildings, and ii) Ground motion intensity values at the buildings’ locations. This study investigates effects of different ground motion inputs on the derived fragility functions. The previously constructed fragility curves (Hancilar et al., 2013), which rely on specific shaking intensity maps published by the USGS after the 2010 Haiti Earthquake, are compared with the fragility functions computed in the present study. Building data come from field surveys of 6,347 buildings that are classified with respect to structural material type and number of stories. For damage assessment, the European Macroseismic Scale (EMS-98) damage grades are adopted. The simplest way to account for the variability in ground motion input could have been achieved by employing different ground motion prediction equations (GMPEs) and their standard variations. However, in this work, we prefer to rel...
Assessing Seismic Fragility of Low-Rise RC Buildings by means of Incremental Dynamic Analysis (IDA)
2022
The modern era witnessed an urbanization and economic growth concentrated in urban areas. Despite an increase in welfare, this receives a greater threat when an earthquake occurs. This research aims to assess the structural risk of low to medium-rise reinforced concrete building structures, commonly built in developing countries. This research was carried out by performing an incremental dynamic analysis (IDA) od an existing building model. In this analysis, the structural model was given a set of dynamic earthquake loads which were increased in magnitude according to certain scale rules until the structure experienced nonlinear behavior and reached a near collapse condition. Five artificial accelerogram recordings were applied on the structure after matching with the spectral response of the target location of the structure. From the analysis, the IDA curves were obtained which describes the global dynamic behavior of the structure, namely displacement due to earthquake lateral loads. Then the damage limits were determined on the IDA curve based on the HAZUS criteria. Then the seismic risk was expressed by constructing a seismic fragility curve. This curve states the probability of exceeding certain damage limits due to variation in earthquake intensity during the service life of the structure.
Rapid and in-depth analysis for seismic risk evaluation
Journal of Physics: Conference Series
The high public demand on housing in urban areas requires the government of Indonesia to adopt a policy of encouraging the development of vertical housing. Cilacap has been allocated Rusunawa (low-income apartment) development in 2006. Evident from some earthquakes occurrence in recent years, however, Cilacap may be seen as an earthquake prone region which posing some risk to this type of vertical structures. The Appropriate strategy should be performed to evaluate the seismic risks of this local government owned four stories low-income apartment. This paper demonstrates two tier evaluation strategy; rapid evaluation and in-depth analysis and compares both results. First evaluation was conducted by means of Building Rapid Visual Screening (RVS) of FEMA 154 of the Rusunawa block A and B. The result was used further to calculate seismic risk score (SR) which exhibit the probability of the building damage given the Maximum Considered Earthquake (MCER) that will occur during the Rusunawa service life. The in-depth analysis was conducted by developing fragility function expressed in the form of fragility curves for the Rusunawa. The fragility shows the probability that certain damage states will be exceeded given the intensity of earthquakes which will occur during building service life. The fragility was developed as lognormal curves in which the building response to earthquake input was analyzed by means of pushover.
Fragility Analysis for Seismic Vulnerability Assessment of Buildings: A Review
Fragility analysis is one of the trending probabilistic seismic performance methodologies. With the advancement in computational methodologies and large database of existing buildings, fragility analysis can be implemented for precise vulnerability assessment of buildings. The vulnerability curves can be categorized into three groups-empirical, analytical and hybrid. Empirical approach includes-Damage Probability Matrices and Vulnerability Functions, which depend on the damage-motion relationship statistics observed after an earthquake. Analytical curves adopt damage distributions simulated from the analyses of structural models. Hybrid curves overcome the deficiencies of the above two approaches by combining post-earthquake damage statistics with simulation techniques. This paper reviews the importance of fragility analysis using existing methodologies and focuses on their key features highlighting limitations. The paper suggests the way forward for selection of appropriate assessm...