Pub Date : 2021-09-01DOI: 10.7712/120121.8564.19069
G. Minafó, G. Camarda
{"title":"GENETIC OPTIMIZATION FOR THE DESIGN OF SEISMIC RETROFITTING OF PLANE RC FRAMES WITH BUCKLING RESTRAINED BRACES (BRBS)","authors":"G. Minafó, G. Camarda","doi":"10.7712/120121.8564.19069","DOIUrl":"https://doi.org/10.7712/120121.8564.19069","url":null,"abstract":"","PeriodicalId":66281,"journal":{"name":"地震工程与工程振动","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82893757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-28DOI: 10.7712/120121.8788.19942
Igor Bouckaert, M. Godio, J. Almeida
{"title":"LARGE-DISPLACEMENT RESPONSE OF UNREINFORCED MASONRY STRUCTURES: COMPARISON BETWEEN ANALYTICAL SOLUTIONS AND DEM MODELS INCLUDING OPEN-SOURCE SOFTWARE","authors":"Igor Bouckaert, M. Godio, J. Almeida","doi":"10.7712/120121.8788.19942","DOIUrl":"https://doi.org/10.7712/120121.8788.19942","url":null,"abstract":"","PeriodicalId":66281,"journal":{"name":"地震工程与工程振动","volume":"74 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80753276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-01DOI: 10.7712/120121.8590.18977
Michalis F. Vassiliou, M. Broccardo, C. Cengiz, M. Dietz, L. Dihoru, S. Günay, K. Mosalam, G. Mylonakis, A. Sextos, B. Stojadinović
{"title":"3D ROCKING MOTION: BLIND PREDICTION CONTEST RESULTS AND INFLUENCE OF EVALUATION METRIC ON THE RANKINGS","authors":"Michalis F. Vassiliou, M. Broccardo, C. Cengiz, M. Dietz, L. Dihoru, S. Günay, K. Mosalam, G. Mylonakis, A. Sextos, B. Stojadinović","doi":"10.7712/120121.8590.18977","DOIUrl":"https://doi.org/10.7712/120121.8590.18977","url":null,"abstract":"","PeriodicalId":66281,"journal":{"name":"地震工程与工程振动","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85979116","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-01DOI: 10.7712/120121.8545.18965
L. Giudice, R. Wróbel, Antonios A. Katsamakas, C. Leinenbach, Michalis F. Vassiliou
Time history analysis is considered as the state-of-the-art in modeling of the seismic response of RC structures. Its validation involves predicting the response of an RC structure tested on a shaking table. However, blind prediction contests show that most contestants fail to predict the seismic response of the tested specimens. Given that numerical models are able to accurately capture the behavior of RC members at a component level, we can conclude that a large part of the error sources from the assumptions made to pass from component level to system level, i.e. assumptions related to damping formulation, component interaction, boundary conditions etc. In parallel, the prediction of the response of a structure subjected to a single ground motion has been proven to be too strict of a validation procedure. Oftentimes, a statistical approach involving many specimens and ground motions is necessary. Such an approach is clearly only feasible at a very small scale. At such scales, the reinforcement fabrication and positioning become major issues. We propose to use additive manufacturing technology to digitally fabricate the reinforcement cage necessary for the micro RC element. This paper presents the results from cyclic tests on 1:40 scale RC cantilever columns. The reinforcing cages were manufactured using a Selective Laser Melting 3D printer that was able to print rebars with submillimeter diameter and yield strength 378MPa. Two different microconcrete mixtures were used based on cement and gypsum. Each sample was reinforced with 18 longitudinal rebars of 0.6mm diameter, and 0.35mm stirrups with 2.5mm of spacing. The cyclic behavior of the columns closely resembles the behavior of full-scale columns indicating that such small-scale specimens can be used of the statistical validation of global level assumptions that numerical models make.
{"title":"CYCLIC TESTING OF 1:40 SCALE CANTILEVER RC ELEMENTS WITH DIGITALLY MANUFACTURED REINFORCEMENT","authors":"L. Giudice, R. Wróbel, Antonios A. Katsamakas, C. Leinenbach, Michalis F. Vassiliou","doi":"10.7712/120121.8545.18965","DOIUrl":"https://doi.org/10.7712/120121.8545.18965","url":null,"abstract":"Time history analysis is considered as the state-of-the-art in modeling of the seismic response of RC structures. Its validation involves predicting the response of an RC structure tested on a shaking table. However, blind prediction contests show that most contestants fail to predict the seismic response of the tested specimens. Given that numerical models are able to accurately capture the behavior of RC members at a component level, we can conclude that a large part of the error sources from the assumptions made to pass from component level to system level, i.e. assumptions related to damping formulation, component interaction, boundary conditions etc. In parallel, the prediction of the response of a structure subjected to a single ground motion has been proven to be too strict of a validation procedure. Oftentimes, a statistical approach involving many specimens and ground motions is necessary. Such an approach is clearly only feasible at a very small scale. At such scales, the reinforcement fabrication and positioning become major issues. We propose to use additive manufacturing technology to digitally fabricate the reinforcement cage necessary for the micro RC element. This paper presents the results from cyclic tests on 1:40 scale RC cantilever columns. The reinforcing cages were manufactured using a Selective Laser Melting 3D printer that was able to print rebars with submillimeter diameter and yield strength 378MPa. Two different microconcrete mixtures were used based on cement and gypsum. Each sample was reinforced with 18 longitudinal rebars of 0.6mm diameter, and 0.35mm stirrups with 2.5mm of spacing. The cyclic behavior of the columns closely resembles the behavior of full-scale columns indicating that such small-scale specimens can be used of the statistical validation of global level assumptions that numerical models make.","PeriodicalId":66281,"journal":{"name":"地震工程与工程振动","volume":"74 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80506133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.7712/120121.8514.19628
Ida Mascolo, A. Fortunato, C. Olivieri, A. Gesualdo
In many seismically active regions of the world there are large numbers of masonry buildings. Most of these buildings have not been designed for seismic loads. Recent earthquakes have shown that many of these buildings are seismically vulnerable and should be considered for retrofitting. Different conventional and unconventional retrofitting techniques are available to increase the strength and/or ductility of unreinforced masonry (URM) walls. This paper reviews and discusses seismic retrofitting of masonry walls with emphasis on the conventional techniques. Retrofitting procedures are discussed with regard to a case study: a stone masonry building in Irpinia region, damaged by the 1980 earthquake. The interventions are evaluated by means of finite elements with a macroelement obtained with a homogenization technique. Linear and nonlinear procedures are compared, and peculiarities of each procedure are shown.
{"title":"SEISMIC RETROFITTING TECHNIQUES FOR EXISTING MASONRY BUILDINGS","authors":"Ida Mascolo, A. Fortunato, C. Olivieri, A. Gesualdo","doi":"10.7712/120121.8514.19628","DOIUrl":"https://doi.org/10.7712/120121.8514.19628","url":null,"abstract":"In many seismically active regions of the world there are large numbers of masonry buildings. Most of these buildings have not been designed for seismic loads. Recent earthquakes have shown that many of these buildings are seismically vulnerable and should be considered for retrofitting. Different conventional and unconventional retrofitting techniques are available to increase the strength and/or ductility of unreinforced masonry (URM) walls. This paper reviews and discusses seismic retrofitting of masonry walls with emphasis on the conventional techniques. Retrofitting procedures are discussed with regard to a case study: a stone masonry building in Irpinia region, damaged by the 1980 earthquake. The interventions are evaluated by means of finite elements with a macroelement obtained with a homogenization technique. Linear and nonlinear procedures are compared, and peculiarities of each procedure are shown.","PeriodicalId":66281,"journal":{"name":"地震工程与工程振动","volume":"98 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74170185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.7712/120121.8771.18591
Dewald Z. Gravett, G. Markou
{"title":"A NEW PARALLEL ALGORITHM FOR THE OPTIMUM EMBEDDED REBAR MESH GENERATION FOR LARGE-SCALE REINFORCED CONCRETE STRUCTURES","authors":"Dewald Z. Gravett, G. Markou","doi":"10.7712/120121.8771.18591","DOIUrl":"https://doi.org/10.7712/120121.8771.18591","url":null,"abstract":"","PeriodicalId":66281,"journal":{"name":"地震工程与工程振动","volume":"79 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74475440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.7712/120121.8663.18917
Claudia Canuti, M. Morici, A. Dall'asta, G. Leoni
{"title":"APPLICATION OF THE EMPIRICAL PREDICTIVE DAMAGE MODEL OF HISTORICAL CHURCHES","authors":"Claudia Canuti, M. Morici, A. Dall'asta, G. Leoni","doi":"10.7712/120121.8663.18917","DOIUrl":"https://doi.org/10.7712/120121.8663.18917","url":null,"abstract":"","PeriodicalId":66281,"journal":{"name":"地震工程与工程振动","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74546770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.7712/120121.8614.18818
Giacomo Miluccio, D. Losanno, F. Parisi, E. Cosenza
{"title":"FRAGILITY OF EXISTING ITALIAN BRIDGES TO TRAFFIC LOADS","authors":"Giacomo Miluccio, D. Losanno, F. Parisi, E. Cosenza","doi":"10.7712/120121.8614.18818","DOIUrl":"https://doi.org/10.7712/120121.8614.18818","url":null,"abstract":"","PeriodicalId":66281,"journal":{"name":"地震工程与工程振动","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72926766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.7712/120121.8631.18620
A. Aloisio, F. Boggian, R. Tomasi
The European Union has sponsored the development of a new friction dissipating system, for improving seismic behaviour of existing buildings. The proposed system consists of CLT-elements connected to the external beams of existing reinforced concrete building using steel profiles. Each of the steel profiles consists of two separate plates connected by a friction connection made by preloaded bolts in elongated holes. The authors carried out the experimental testing of the friction connection by estimating the corresponding hysteresis curve. A Duhem-like mechanical model, matching with the experimental results, simulates the cyclic response of the connection. The authors investigate the seismic performance of a structural archetype, a plane RC frame with CLT shear walls equipped with this sort of friction dampers. It is assessed the optimum preload condition to achieve an optimal seismic performance according to the Italian seismic scenario by the fragility assessments. A selected suite of earthquakes is the basis of Incremental Dynamic Analysis (IDA) of the structural archetype, without and with the friction device. The optimum preload of the dissipating systems descends by optimizing the structural performance: maximizing the dissipated energy by preventing damage to the CLT panel and the reinforced concrete frame.
{"title":"OPTIMIZATION OF THE SLIP FORCE IN A NOVEL FRICTION-BASED CONNECTION FOR THE E-CLT TECHNOLOGY","authors":"A. Aloisio, F. Boggian, R. Tomasi","doi":"10.7712/120121.8631.18620","DOIUrl":"https://doi.org/10.7712/120121.8631.18620","url":null,"abstract":"The European Union has sponsored the development of a new friction dissipating system, for improving seismic behaviour of existing buildings. The proposed system consists of CLT-elements connected to the external beams of existing reinforced concrete building using steel profiles. Each of the steel profiles consists of two separate plates connected by a friction connection made by preloaded bolts in elongated holes. The authors carried out the experimental testing of the friction connection by estimating the corresponding hysteresis curve. A Duhem-like mechanical model, matching with the experimental results, simulates the cyclic response of the connection. The authors investigate the seismic performance of a structural archetype, a plane RC frame with CLT shear walls equipped with this sort of friction dampers. It is assessed the optimum preload condition to achieve an optimal seismic performance according to the Italian seismic scenario by the fragility assessments. A selected suite of earthquakes is the basis of Incremental Dynamic Analysis (IDA) of the structural archetype, without and with the friction device. The optimum preload of the dissipating systems descends by optimizing the structural performance: maximizing the dissipated energy by preventing damage to the CLT panel and the reinforced concrete frame.","PeriodicalId":66281,"journal":{"name":"地震工程与工程振动","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75496392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.7712/120121.8744.19033
Leonardo Cipriani, A. Dall'asta, G. Leoni, M. Morici, A. Zona
{"title":"FIRST RESULTS OF LONG-TERM MONITORING OF PORTICO VARANO IN THE CAMERINO DUCAL PALACE (ITALY)","authors":"Leonardo Cipriani, A. Dall'asta, G. Leoni, M. Morici, A. Zona","doi":"10.7712/120121.8744.19033","DOIUrl":"https://doi.org/10.7712/120121.8744.19033","url":null,"abstract":"","PeriodicalId":66281,"journal":{"name":"地震工程与工程振动","volume":"499 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77343224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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