Earthquakes and Structures最新文献_第10页

Seismic fragility curves using pulse-like and spectrally equivalent ground-motion records 地震易损性曲线使用脉冲和频谱等效的地面运动记录

IF 1.5 4区工程技术

Earthquakes and Structures Pub Date : 2020-08-01 DOI: 10.12989/EAS.2020.19.2.079

M. Surana

引用次数: 0

Foundation size effect on the efficiency of seismic base isolation using a layer of stone pebbles 地基尺寸对石卵石隔震效果的影响

IF 1.5 4区工程技术

Earthquakes and Structures Pub Date : 2020-08-01 DOI: 10.12989/EAS.2020.19.2.103

I. Banović, J. Radnić, N. Grgić

引用次数: 8

Structural health monitoring of seismically vulnerable RC frames under lateral cyclic loading 横向循环荷载作用下地震易损性钢筋混凝土框架结构健康监测

IF 1.5 4区工程技术

Earthquakes and Structures Pub Date : 2020-07-01 DOI: 10.12989/EAS.2020.19.1.29

C. Chalioris, M. E. Voutetaki, A. Liolios

{"title":"Structural health monitoring of seismically vulnerable RC frames under lateral cyclic loading","authors":"C. Chalioris, M. E. Voutetaki, A. Liolios","doi":"10.12989/EAS.2020.19.1.29","DOIUrl":"https://doi.org/10.12989/EAS.2020.19.1.29","url":null,"abstract":"The effectiveness and the sensitivity of a Wireless impedance/Admittance Monitoring System (WiAMS) for the prompt damage diagnosis of two single-storey single-span Reinforced Concrete (RC) frames under cyclic loading is experimentally investigated. The geometrical and the reinforcement characteristics of the RC structural members of the frames represent typical old RC frame structure without consideration of seismic design criteria. The columns of the frames are vulnerable to shear failure under lateral load due to their low height-to-depth ratio and insufficient transverse reinforcement. The proposed Structural Health Monitoring (SHM) system comprises of specially manufactured autonomous portable devices that acquire the in-situ voltage frequency responses of a network of twenty piezoelectric transducers mounted to the RC frames. Measurements of external and internal small-sized piezoelectric patches are utilized for damage localization and assessment at various and increased damage levels as the magnitude of the imposed lateral cycle deformations increases. A bare RC frame and a strengthened one using a pair of steel crossed tension-ties (X-bracing) have been tested in order to check the sensitivity of the developed WiAMS in different structural conditions since crack propagation, damage locations and failure mode of the examined frames vary. Indeed, the imposed loading caused brittle shear failure to the column of the bare frame and the formation of plastic hinges at the beam ends of the X-braced frame. Test results highlighted the ability of the proposed SHM to identify incipient damages due to concrete cracking and steel yielding since promising early indication of the forthcoming critical failures before any visible sign has been obtained.","PeriodicalId":49080,"journal":{"name":"Earthquakes and Structures","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42162597","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: 29

Dynamic interaction effects of buried structures on seismic response of surface structures 地下结构动力相互作用对地表结构地震反应的影响

IF 1.5 4区工程技术

Earthquakes and Structures Pub Date : 2020-07-01 DOI: 10.12989/EAS.2020.19.1.001

Rafet Sisman, Y. Ayvaz

{"title":"Dynamic interaction effects of buried structures on seismic response of surface structures","authors":"Rafet Sisman, Y. Ayvaz","doi":"10.12989/EAS.2020.19.1.001","DOIUrl":"https://doi.org/10.12989/EAS.2020.19.1.001","url":null,"abstract":"This study presents an investigation of the dynamic interactions between a surface structure lying on two different soil deposits and a square-shaped buried structure embedded in the soil. To this end, a large number of numerical models are generated by using a well-known Finite Element Method software, i.e., OpenSEES. The interaction phenomenon is assumed to be affected by six different parameters. In the parametric study, these parameters are assumed to have various values in accordance with the engineering practices. A total of 1620 possible combinations of the parameter values are addressed in this study. 30 different numerical models are also generated as the 'free-field cases' to set a reference. The surface structure drift and acceleration amplifications are used as a measure to evaluate the dynamic interactions. The response (i.e., drifts and accelerations) amplifications are calculated as the ratio of the maximum surface structure response in any 'case' to the maximum surface structure response in corresponding free-field case. Variation of the response amplifications with any of the investigated parameters is addressed in this paper. The results obtained from the numerical analyses clearly reveal that the presence of a buried structure in the vicinity of a surface structure can cause both amplification and de-amplification of the surface structure responses, depending on the case parameters.","PeriodicalId":49080,"journal":{"name":"Earthquakes and Structures","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47841779","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

Estimation of elastic seismic demands in TU structures using interactive relations between shear and torsion 利用剪切和扭转相互作用关系估计TU结构的弹性地震需求

IF 1.5 4区工程技术

Earthquakes and Structures Pub Date : 2020-07-01 DOI: 10.12989/EAS.2020.19.1.59

Ruth A. Abegaz, Han‐Seon Lee

{"title":"Estimation of elastic seismic demands in TU structures using interactive relations between shear and torsion","authors":"Ruth A. Abegaz, Han‐Seon Lee","doi":"10.12989/EAS.2020.19.1.59","DOIUrl":"https://doi.org/10.12989/EAS.2020.19.1.59","url":null,"abstract":"The code static eccentricity model for elastic torsional design of structures has two critical shortcomings: (1) the \u0000negation of the inertial torsional moment at the center of mass (CM), particularly for torsionally-unbalanced (TU) building \u0000structures, and (2) the confusion caused by the discrepancy in the definition of the design eccentricity in codes and the resistance \u0000eccentricity commonly used by engineers such as in FEMA454. To overcome these shortcomings, using the resistance \u0000eccentricity model that can accommodate the inertial torsional moment at the CM, interactive relations between shear and \u0000torsion are proposed as follows: (1) elastic responses of structures at instants of peak edge-frame drifts are given as functions of \u0000resistance eccentricity, and (2) elastic hysteretic relationships between shear and torsion in forces and deformations are bounded \u0000by ellipsoids constructed using two adjacent dominant modes. Comparison of demands estimated using these two interactive \u0000relations with those from shake-table tests of two TU building structures (a 1:5-scale five-story reinforced concrete (RC) \u0000building model and a 1:12-scale 17-story RC building model) under the service level earthquake (SLE) show that these relations \u0000match experimental results of models reasonably well. Concepts proposed in this study enable engineers to not only visualize the \u0000overall picture of torsional behavior including the relationship between shear and torsion with the range of forces and \u0000deformations, but also pinpoint easily the information about critical responses of structures such as the maximum edge-frame \u0000drifts and the corresponding shear force and torsion moment with the eccentricity.","PeriodicalId":49080,"journal":{"name":"Earthquakes and Structures","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45603452","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

Suspended Columns for Seismic Isolation in Structures (SCSI):Experimental and numerical studies 用于结构抗震隔离的悬架柱:实验和数值研究

IF 1.5 4区工程技术

Earthquakes and Structures Pub Date : 2020-07-01 DOI: 10.12989/EAS.2020.19.1.017

A. Shahabi, Gholamreza Zamani Ahari, M. Barghian

{"title":"Suspended Columns for Seismic Isolation in Structures (SCSI):Experimental and numerical studies","authors":"A. Shahabi, Gholamreza Zamani Ahari, M. Barghian","doi":"10.12989/EAS.2020.19.1.017","DOIUrl":"https://doi.org/10.12989/EAS.2020.19.1.017","url":null,"abstract":"In this paper, a modified and improved seismic isolation system called suspension columns for seismic isolation was investigated. An experimental study of the proposed isolation method, together with theoretical and numerical analyses, has thoroughly been conducted. In the proposed method, during the construction of the foundation, some cavities are created at the position of the columns inside the foundation and the columns are placed inside the cavities and hanged from the foundation by flexible cables rather being directly connected to the foundation. Since the columns are suspended and due to the gap between the columns and walls of the cavities, the structure is able to move freely to each side thus, the transmitted seismic actions are reduced. The main parameter of this isolation technique is the length of the suspension cable. As the cable length is changed, the natural frequency of the structure is also changed, thus, the desired frequency can be achieved by means of an appropriate cable length. As the experimental phase of the study, a steel frame structure with two floors was constructed and subjected to the acceleration of three earthquakes using a shaking table with different hanging cable lengths. The structural responses were recorded in terms of acceleration and relative displacement. The experimental results were compared to the theoretical and numerical ones, obtained from the MATLAB programming and the finite element software ABAQUS, showing a suitable agreement between them. The results confirm the effectiveness of the proposed isolation method in reducing the seismic effects on the structure.","PeriodicalId":49080,"journal":{"name":"Earthquakes and Structures","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47503616","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

Evaluation of structural operativity of two strategic buildings through Seismic Model 用地震模型评价两栋战略建筑的结构使用性能

IF 1.5 4区工程技术

Earthquakes and Structures Pub Date : 2020-07-01 DOI: 10.12989/EAS.2020.19.1.045

D. Foti, N. Giannoccaro, P. Greco, Michela Lerna, Raffaele Paolicelli, V. Vacca

{"title":"Evaluation of structural operativity of two strategic buildings through Seismic Model","authors":"D. Foti, N. Giannoccaro, P. Greco, Michela Lerna, Raffaele Paolicelli, V. Vacca","doi":"10.12989/EAS.2020.19.1.045","DOIUrl":"https://doi.org/10.12989/EAS.2020.19.1.045","url":null,"abstract":"This paper presents the experimental application of a new method for seismic vulnerability assessment of buildings recently introduced in literature, the SMAV (Seismic Model Ambient Vibration) methodology with reference to their operational limit state. The importance of this kind of evaluation arises from the civil protection necessity that some buildings, considered strategic for seismic emergency management, should retain their functionality also after a destructive earthquake. They do not suffer such damage as to compromise the operation within a framework of assessment of the overall capacity of the urban system. To this end, for the characterization of their operational vulnerability, a Structural Operational Index (IOPS) has been considered. In particular, the dynamic environmental vibrations of the two considered strategic buildings, the fire station and the town hall building of a small town in the South of Italy, have been monitored by positioning accelerometers in well-defined points. These measurements were processed through modern Operational Modal Analysis techniques (OMA) in order to identify natural frequencies and modal shapes. Once these parameters have been determined, the structural operational efficiency index of the buildings has been determined evaluating the seismic vulnerability of the strategic structures analyzed. his study aimed to develop a model to accurately predict the acceleration of structural systems during an earthquake.","PeriodicalId":49080,"journal":{"name":"Earthquakes and Structures","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2020-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41817204","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

Enhanced salp swarm algorithm based on opposition learning and merit function methods for optimum design of MTMD 基于对立学习和优点函数法的改进salp群算法在MTMD优化设计中的应用

IF 1.5 4区工程技术

Earthquakes and Structures Pub Date : 2020-06-01 DOI: 10.12989/EAS.2020.18.6.719

Farzad Raeesi, Sina Shirgir, B. F. Azar, H. Veladi, H. Ghaffarzadeh

引用次数: 3

Structure-soil-structure interaction in a group of buildings using 3D nonlinear analyses 基于三维非线性分析的建筑群结构-土-结构相互作用

IF 1.5 4区工程技术

Earthquakes and Structures Pub Date : 2020-06-01 DOI: 10.12989/EAS.2020.18.6.667

Behroozeh Sharifi, G. Nouri, A. Ghanbari

{"title":"Structure-soil-structure interaction in a group of buildings using 3D nonlinear analyses","authors":"Behroozeh Sharifi, G. Nouri, A. Ghanbari","doi":"10.12989/EAS.2020.18.6.667","DOIUrl":"https://doi.org/10.12989/EAS.2020.18.6.667","url":null,"abstract":"The current study compares the effect of structure-soil-structure interaction (SSSI) on the dynamic responses of adjacent buildings and isolated structures including soil-structure interaction (SSI) with the responses of fixed-base structures. Structural responses such as the relative acceleration, displacement, drift and shear force were considered under earthquake ground motion excitation. For this purpose, 5-, 10- and 15-story structures with 2-bay moment resisting frames resting on shallow foundations were modeled as a group of buildings in soft soil media. Viscous lateral boundaries and interface elements were applied to the soil model to simulate semi-infinite soil media, frictional contact and probable slip under seismic excitation. The direct method was employed for fully nonlinear time-history dynamic analysis in OpenSees using 3D finite element soil-structure models with different building positions. The results showed that the responses of the grouped structures were strongly influenced by the adjacent structures. The responses were as much as 4 times greater for drift and 2.3 times greater for shear force than the responses of fixed-base models.","PeriodicalId":49080,"journal":{"name":"Earthquakes and Structures","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47726134","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: 3

Seismic performance of South Nias traditional timber houses: A priority ranking based condition assessment South Nias传统木结构房屋的抗震性能:基于条件评估的优先级排序

IF 1.5 4区工程技术

Earthquakes and Structures Pub Date : 2020-06-01 DOI: 10.12989/EAS.2020.18.6.731

M. Sodangi, Z. Kazmi

{"title":"Seismic performance of South Nias traditional timber houses: A priority ranking based condition assessment","authors":"M. Sodangi, Z. Kazmi","doi":"10.12989/EAS.2020.18.6.731","DOIUrl":"https://doi.org/10.12989/EAS.2020.18.6.731","url":null,"abstract":"Due to incessant earthquakes, many historic South Nias traditional timber houses have been damaged while some still stand today. As Nias is part of an extremely active tectonic region and the buildings are getting older by day, it is essential that these unique houses are well maintained and functioning well. A post-earthquake condition assessment was conducted on 2 selected buildings; 'Buildings'was found out to be poor and the main structural members were not performing as intended. In 'Buildings B',the columns were not well anchored to the ground, no tie beams to tie the columns together, and eventually, the timber columns moved in various directions during the earthquake. The frequent earthquakes along with deterioration due to lack of proper maintenance program are responsible for the non-survival of the buildings. Thus, a process guideline for managing the maintenance of these buildings was proposed. This is necessary because managing the maintenance works could help to extend the life of the buildings and seek to avoid the need for potentially expensive and disruptive intervention works, which may damage the cultural significance of the buildings.","PeriodicalId":49080,"journal":{"name":"Earthquakes and Structures","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41292381","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