Earthquakes and Structures最新文献

Base-isolated steel structure with spring limitersunder near-fault earthquakes: Experiment 近断层地震下带弹簧限位器的基础隔震钢结构试验

IF 1.5 4区工程技术

Earthquakes and Structures Pub Date : 2021-09-01 DOI: 10.12989/EAS.2021.21.3.239

Miao Han, Yuandong Wang, Hongkai Du, Xiangyang Chu, Mingjian Cui, Lingshuai Meng

引用次数: 2

Seismic fragility of structures with energy dissipation devices for mainshock-aftershock events 具有消能装置的主震-余震结构的地震易损性

IF 1.5 4区工程技术

Earthquakes and Structures Pub Date : 2021-09-01 DOI: 10.12989/EAS.2021.21.3.219

M. Noureldin, M. Adane, Jinkook Kim

{"title":"Seismic fragility of structures with energy dissipation devices for mainshock-aftershock events","authors":"M. Noureldin, M. Adane, Jinkook Kim","doi":"10.12989/EAS.2021.21.3.219","DOIUrl":"https://doi.org/10.12989/EAS.2021.21.3.219","url":null,"abstract":"This paper presents a mainshock-aftershock seismic fragility and collapse capacity assessment of reinforced concrete (RC) structures retrofitted with a hybrid damper composed of a steel slit plate and friction pads. Three and eight-story RC buildings are designed and assessed before and after retrofit considering the aftershocks effect. Non-linear time-history response analysis (NLTHA) using twelve natural earthquake sequences are used to produce incremental dynamic analysis (IDA) curves to obtain the median collapse capacity of the structures. Three different damage state (DS) levels are used for the mainshock ground excitation to quantify the scale factors required for conducting the aftershock IDAs. The maximum inter-story drift ratio (MIDR) is used as the main engineering demand parameter. The study shows the importance of considering the aftershock in the seismic assessment process of RC structures. The un-retrofitted structures are found to experience a high level of deterioration under aftershock event which is not considered in the design stage. The findings of the study reveal that the mainshock-aftershock sequence responses of the retrofitted structures show better performance in terms of the median collapse capacity and the seismic fragility compared to the un-retrofitted ones.","PeriodicalId":49080,"journal":{"name":"Earthquakes and Structures","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47513510","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Seismic performance assessment of code-conforming precast reinforced concrete frames in China 中国符合规范的预制钢筋混凝土框架抗震性能评估

IF 1.5 4区工程技术

Earthquakes and Structures Pub Date : 2021-09-01 DOI: 10.12989/EAS.2021.21.3.277

Zhun Wang, D. Feng, Xu-Yang Cao, Gang Wu

{"title":"Seismic performance assessment of code-conforming precast reinforced concrete frames in China","authors":"Zhun Wang, D. Feng, Xu-Yang Cao, Gang Wu","doi":"10.12989/EAS.2021.21.3.277","DOIUrl":"https://doi.org/10.12989/EAS.2021.21.3.277","url":null,"abstract":"Precast reinforced concrete (RC) frames have been rapidly developed in structural engineering due to their various advantages, such as high efficiency and low environmental pollution. However, the construction quality of precast RC frames is difficult to guarantee, and the interface of new and old concrete and the bond-slip effects of additional steel bars may lead to different performance levels of precast RC frames. Therefore, it is necessary and important to investigate and assess the seismic performance of precast RC frames that adopt the conformation of Chinese code. In this paper, a numerical simulation method for precast RC frames is developed based on OpenSEES software, in which the Joint2D element is used to simulate the beam-to-column connections to consider the shear and bond-slip effects. Two prototype structures of precast RC frames are designed, and the nonlinear time history analysis is performed to explore the seismic performance of the precast RC frames according to the Chinese code. Meanwhile, the incremental dynamic analysis and fragility analysis are conducted to study the differences in seismic performance and collapse resistance between precast RC frames and cast-in-situ RC frames.","PeriodicalId":49080,"journal":{"name":"Earthquakes and Structures","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43528900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Seismic behaviour of dams to near fault and far fault ground motions: A state of the art review 近断层和远断层地震动对大坝地震行为的影响:最新进展

IF 1.5 4区工程技术

Earthquakes and Structures Pub Date : 2021-09-01 DOI: 10.12989/EAS.2021.21.3.251

Soumya Gorai, D. Maity

{"title":"Seismic behaviour of dams to near fault and far fault ground motions: A state of the art review","authors":"Soumya Gorai, D. Maity","doi":"10.12989/EAS.2021.21.3.251","DOIUrl":"https://doi.org/10.12989/EAS.2021.21.3.251","url":null,"abstract":"Dams are constructed across the river to confine the water and utilize it for various purposes such as hydroelectricity generation, flood control, irrigation, etc. Failure of dams causes huge loss to property and lives. Dams, designed to be built in high seismicity areas, are prone to damage due to intensive earthquake events. Strong ground motions recorded in the vicinity of fault planes are generally considered as near fault (or near source) ground motions. Near fault ground motions possess considerably different features which have high damage potential. In last few decades, a lot of studies have been conducted on the identification, characterization and simulation of pulse-type and non pulse-type ground motions. However, researchers have paid attention to the seismic safety assessment of dams under near fault and far fault ground motions since the last decade. In this context, this present study reports a state-of-the-art review on the seismic behaviour of various types of dams under different ground motions, based on available literature. This study also describes existing modelling techniques of the dam-reservoir-foundation system, failure modes, seismic analysis method and seismic response of different kinds of dams to near fault and far fault earthquakes. Finally, the study attempts to find the research gaps, which should be given proper attention in the future.","PeriodicalId":49080,"journal":{"name":"Earthquakes and Structures","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42698123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Seismic Site Classification from HVSR Data using the Rayleigh wave ellipticity inversion: A case study in Singapore 利用瑞利波椭圆度反演HVSR数据进行地震场址分类:以新加坡为例

IF 1.5 4区工程技术

Earthquakes and Structures Pub Date : 2021-09-01 DOI: 10.12989/EAS.2021.21.3.231

Shynggys Abdialim, Farkhod Hakimov, Jong R. Kim, T. Ku, Sung-Woo Moon

{"title":"Seismic Site Classification from HVSR Data using the Rayleigh wave ellipticity inversion: A case study in Singapore","authors":"Shynggys Abdialim, Farkhod Hakimov, Jong R. Kim, T. Ku, Sung-Woo Moon","doi":"10.12989/EAS.2021.21.3.231","DOIUrl":"https://doi.org/10.12989/EAS.2021.21.3.231","url":null,"abstract":"Shear wave velocity (Vs) profile is one of the critical geotechnical measurements of soil layers for seismic hazard assessment and liquefaction potential evaluation. Enhancing the effectiveness of in-situ Vs profiling by reducing time and cost is of great interest. For that reason, this study aims at assessing Vs profile generation from a single-station three-component geophone with additional borehole log data for constraining parameter space. Based on multichannel analysis of surface waves (MASW), and microtremor array Measurements (MAM) conducted previously at seven sites located in Bukit Timah Granite, Singapore, this study utilized HVSR signals for Rayleigh wave ellipticity (ellipticity curve) inversion with additional inversion constraint using borehole log data. The resulting Vs profiles and reference Vs profiles from MASW and MAM were quantitatively compared using average Vs of 30 m (Vs30). The profiles generated from ellipticity curve inversion revealed a good agreement with Vs reference profiles. Vs30 based site classification results also indicated a good fit of two test results. Therefore, HVSR measurements for further ellipticity curve inversion, with already available borehole log data for constraint, is considered as a promising cost and time-effective site classification approach.","PeriodicalId":49080,"journal":{"name":"Earthquakes and Structures","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46904393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Mathematical model and results for seismicresponses of a nonlinear isolation system 非线性隔震系统地震反应的数学模型及结果

IF 1.5 4区工程技术

Earthquakes and Structures Pub Date : 2021-09-01 DOI: 10.12989/EAS.2021.21.3.291

Shanshan Li, P. Xiang, Biao Wei, Tan Hao, Yunji Fu

引用次数: 0

Collapse mechanism estimation of a historical masonry minaretconsidered soil-structure interaction 考虑土-结构相互作用的历史砖石尖塔倒塌机理评估

IF 1.5 4区工程技术

Earthquakes and Structures Pub Date : 2021-08-01 DOI: 10.12989/EAS.2021.21.2.161

Taha Yasin Altıok, A. Demir

{"title":"Collapse mechanism estimation of a historical masonry minaretconsidered soil-structure interaction","authors":"Taha Yasin Altıok, A. Demir","doi":"10.12989/EAS.2021.21.2.161","DOIUrl":"https://doi.org/10.12989/EAS.2021.21.2.161","url":null,"abstract":"Cultures and lifestyles of past communities can be transferred to the next generations through historical structures. Accordingly, these structures should be carefully preserved against devastating events i.e. earthquakes, wind, and fire. Seismic performances of historical structures can be determined with destructive and nondestructive methods. As destructive methods are quite difficult and complex, easier and reliable methods should be used to determine the seismic behaviors of these structures. In this study, the seismic behavior of the historical Lala Mehmet Pasha minaret is investigated by considering Soil-Structure Interaction (SSI). Dynamical properties of the minaret are experimentally obtained with the operational modal analysis (OMA) method and the initial finite element (FE) model is updated. Embedded and SSI models are generated by Abaqus, then linear (LTH) and nonlinear time history (NLTH) analyses are performed. As a result of analyses, displacements, damage, and stress distributions are obtained and interpreted. These analyses show that SSI is quite effective on the structural behavior and results obtained from the nonlinear analysis are more realistic than that of linear analysis.","PeriodicalId":49080,"journal":{"name":"Earthquakes and Structures","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42409247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Non-linear Pushover Analysis and simulation of progressive collapse mechanisms using FE Models for Nativity Church 耶稣诞生教堂非线性推覆分析及渐进倒塌机制有限元模拟

IF 1.5 4区工程技术

Earthquakes and Structures Pub Date : 2021-08-01 DOI: 10.12989/EAS.2021.21.2.185

Belal Almassri, Ali A. Safiyeh

引用次数: 0

Evaluation of the seismic response of liquid storage tanks 储液罐的地震反应评价

IF 1.5 4区工程技术

Earthquakes and Structures Pub Date : 2021-08-01 DOI: 10.12989/EAS.2021.21.2.205

S. Vern, Mahendra K. Shrimalia, S. D. Bharti, T. K. Datta

引用次数: 4

Evaluation of seismic performance of rotational-friction slip dampers in near-field and far-filed earthquakes 旋转摩擦滑移阻尼器在近场和远场地震中的抗震性能评价

IF 1.5 4区工程技术

Earthquakes and Structures Pub Date : 2021-08-01 DOI: 10.12989/EAS.2021.21.2.147

Sahar Borhan, H. Tajammolian, Mehdi Yazdian

{"title":"Evaluation of seismic performance of rotational-friction slip dampers in near-field and far-filed earthquakes","authors":"Sahar Borhan, H. Tajammolian, Mehdi Yazdian","doi":"10.12989/EAS.2021.21.2.147","DOIUrl":"https://doi.org/10.12989/EAS.2021.21.2.147","url":null,"abstract":"In this study, the performance of rotational-friction slip dampers in steel structures with different heights is investigated by the use of fragility curves. The use of dampers is one of the methods for vibration control of structures by simultaneously increasing both the structural stiffness and damping. Rotational-friction slip dampers are among the passive control devices that dampen the earthquake energy through their stable cyclic behavior. To study the performance of these devices in steel structures, 3, 6 and 9-story steel moment frame structures are designed, and the mentioned dampers are attached to the structure by Chevron braces. To account for the earthquake uncertainty, with the aid of incremental dynamic analysis (IDA), the damper-equipped structure is subjected to both near-field and far-field ground motion records. The acceleration and drift engineering demand parameters are selected as the functions to quantify the damage states, and the design, modeling and material properties uncertainties are considered in accordance with FEMA P-695. Evaluation of statistical results and comparison of the fragility curves, shows that the probability of failure at different damage states decreases when the dampers are added to the structure. This decrease is more remarkable in low-rise structures and near-fault ground motions.","PeriodicalId":49080,"journal":{"name":"Earthquakes and Structures","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48278782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2