Pub Date : 1900-01-01DOI: 10.7712/120119.7298.18802
S. E. Rahimi, R. Rupakhety, S. Ólafsson
{"title":"TUNED VIBRATION ABSORBERS FOR CONTROL OF TALL BUILDINGS UNDER WIND AND EARTHQUAKE LOADS","authors":"S. E. Rahimi, R. Rupakhety, S. Ólafsson","doi":"10.7712/120119.7298.18802","DOIUrl":"https://doi.org/10.7712/120119.7298.18802","url":null,"abstract":"","PeriodicalId":414988,"journal":{"name":"Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122262125","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 : 1900-01-01DOI: 10.7712/120119.6922.19344
L. Kotoulas, G. Manos
Unreinforced stone masonry made of low strength mortar has been used for centuries in forming old type stone masonry “Greek” churches. The seismic performance of such stone masonry structures damaged during recent strong seismic activity in Greece combined with long term effects from foundation settlement is presented and discussed. In order to obtain a quantification of the in-plane sliding shear failure criterion a number of stone masonry triplets were built with weak mortar and were tested in the laboratory. Measurements from such shear-sliding tests involving three stone and two mortar joints are presented and discussed together with corresponding numerical simulation results. The cohesive surface interaction constitutive law, with values of its parameters validated through the used process of the specific triplet test, can be also employed in forming realistic limit-state criteria for stone masonry elements. The used simplified dynamic linear elastic analysis can yield realistic prediction of the expected performance of such stone masonry structures. However, the necessity to obtain a more comprehensive set of measured strength properties for such type of masonry construction must be also underlined. From this simplified dynamic linear elastic analysis it can be concluded that the soil-foundation deformability results in a significant increase in the tensile stresses at the region that the tympanum of the spherical dome is supported on the vaulting part that springs from the two interior masonry pilasters and the apse. This conclusion is in agreement with the observed damage that developed in the region of the structural system for this church.
{"title":"UNREINFORCED STONE MASONRY CHURCES IN GREECE UNDER GRAVITATIONAL AND EARTHQUAKE ACTIONS","authors":"L. Kotoulas, G. Manos","doi":"10.7712/120119.6922.19344","DOIUrl":"https://doi.org/10.7712/120119.6922.19344","url":null,"abstract":"Unreinforced stone masonry made of low strength mortar has been used for centuries in forming old type stone masonry “Greek” churches. The seismic performance of such stone masonry structures damaged during recent strong seismic activity in Greece combined with long term effects from foundation settlement is presented and discussed. In order to obtain a quantification of the in-plane sliding shear failure criterion a number of stone masonry triplets were built with weak mortar and were tested in the laboratory. Measurements from such shear-sliding tests involving three stone and two mortar joints are presented and discussed together with corresponding numerical simulation results. The cohesive surface interaction constitutive law, with values of its parameters validated through the used process of the specific triplet test, can be also employed in forming realistic limit-state criteria for stone masonry elements. The used simplified dynamic linear elastic analysis can yield realistic prediction of the expected performance of such stone masonry structures. However, the necessity to obtain a more comprehensive set of measured strength properties for such type of masonry construction must be also underlined. From this simplified dynamic linear elastic analysis it can be concluded that the soil-foundation deformability results in a significant increase in the tensile stresses at the region that the tympanum of the spherical dome is supported on the vaulting part that springs from the two interior masonry pilasters and the apse. This conclusion is in agreement with the observed damage that developed in the region of the structural system for this church.","PeriodicalId":414988,"journal":{"name":"Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015)","volume":"55 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132118056","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 : 1900-01-01DOI: 10.7712/120119.7303.19317
S. Takhirov, L. Kempner, M. Riley, E. Fujisaki, B. Low
{"title":"SEISMIC PROTECTION OF HIGH-VOLTAGE EQUIPMENT BY FRICTION DAMPERS: NUMERICAL MODELLING CORRELATED WITH FULL-SCALE COMPONENT TESTS","authors":"S. Takhirov, L. Kempner, M. Riley, E. Fujisaki, B. Low","doi":"10.7712/120119.7303.19317","DOIUrl":"https://doi.org/10.7712/120119.7303.19317","url":null,"abstract":"","PeriodicalId":414988,"journal":{"name":"Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129962556","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 : 1900-01-01DOI: 10.7712/120119.7119.19577
Filippo Masi, I. Stefanou, P. Vannucci, Victor Maffi-Berthier
{"title":"ROCKING RESPONSE AND OVERTURNING OF MUSEUM ARTEFACTS DUE TO BLAST LOADING","authors":"Filippo Masi, I. Stefanou, P. Vannucci, Victor Maffi-Berthier","doi":"10.7712/120119.7119.19577","DOIUrl":"https://doi.org/10.7712/120119.7119.19577","url":null,"abstract":"","PeriodicalId":414988,"journal":{"name":"Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134435119","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 : 1900-01-01DOI: 10.7712/120119.7077.19083
R. Apostolska, A. Siljanovski, G. Necevska-Cvetanovska
{"title":"INFLUENCE OF HYSTERESIS MODEL PARAMETERS ON SEISMIC PERFORMANCE OF STRUCTURES BASED ON ENERGY INDICATORS","authors":"R. Apostolska, A. Siljanovski, G. Necevska-Cvetanovska","doi":"10.7712/120119.7077.19083","DOIUrl":"https://doi.org/10.7712/120119.7077.19083","url":null,"abstract":"","PeriodicalId":414988,"journal":{"name":"Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134579723","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 : 1900-01-01DOI: 10.7712/120119.6964.19813
Ezgi Tekergul, A. Zulfikar, E. Çelebi, O. Kirtel, Fatih Göktepe
{"title":"EFFECT OF TRENCH BARRIER ON FREE FIELD MOTION DUE TO THE TRAIN AND HIGHSPEED TRAIN PASSAGES","authors":"Ezgi Tekergul, A. Zulfikar, E. Çelebi, O. Kirtel, Fatih Göktepe","doi":"10.7712/120119.6964.19813","DOIUrl":"https://doi.org/10.7712/120119.6964.19813","url":null,"abstract":"","PeriodicalId":414988,"journal":{"name":"Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131888918","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 : 1900-01-01DOI: 10.7712/120119.7035.18724
A. Aloisio, Luca Di Battista, R. Alaggio, M. Fragiacomo
{"title":"ANALYSIS OF THE FORCED DYNAMICS OF A MASONRY FACADE BY MEANS OF INPUT-OUTPUT TECHNIQUES AND A LINEAR REGRESSION MODEL","authors":"A. Aloisio, Luca Di Battista, R. Alaggio, M. Fragiacomo","doi":"10.7712/120119.7035.18724","DOIUrl":"https://doi.org/10.7712/120119.7035.18724","url":null,"abstract":"","PeriodicalId":414988,"journal":{"name":"Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127570348","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 : 1900-01-01DOI: 10.7712/120119.6904.19716
R. Landolfo, Mario D' Anielo, I. Vayas
{"title":"VALORISATION OF KNOWLEDGE FOR EUROPEAN PREQUALIFIED STEEL JOINTS: THE EQUALJOINTS-PLUS PROJECT","authors":"R. Landolfo, Mario D' Anielo, I. Vayas","doi":"10.7712/120119.6904.19716","DOIUrl":"https://doi.org/10.7712/120119.6904.19716","url":null,"abstract":"","PeriodicalId":414988,"journal":{"name":"Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015)","volume":"10 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132808736","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 : 1900-01-01DOI: 10.7712/120119.7350.21300
Serafeim Bakalakos, Manolis Georgioudakis, M. Papadrakakis
. The extended finite element method (XFEM) enriches the polynomial basis functions of standard finite elements with specialized non-smooth functions. The resulting approximation space can be used to solve problems with moving discontinuities, such as cracks, while avoiding the computational cost of remeshing. As the crack propagates, many artificial degrees of freedom are introduced near the crack tip, which can inflate the size of resulting linear system to be solved. In addition, the stiffness matrix of the cracked body may become ill-conditioned, causing slow convergence of iterative solvers. To overcome this, domain decomposition methods for solving the resulting linear systems of crack propagation problems is combined with XFEM to improve its performance. A suitable decomposition is proposed to avoid inter-subdomain boundaries near crack tip area. It is shown that choosing the proper FETI method, offers significant speedup compared to a direct solver that uses the common finite element solution techniques by means of Cholesky/LDL factorization, even if the execution is performed on a single-core systems.
{"title":"DOMAIN DECOMPOSITION METHODS FOR CRACK GROWTH PROBLEMS USING XFEM","authors":"Serafeim Bakalakos, Manolis Georgioudakis, M. Papadrakakis","doi":"10.7712/120119.7350.21300","DOIUrl":"https://doi.org/10.7712/120119.7350.21300","url":null,"abstract":". The extended finite element method (XFEM) enriches the polynomial basis functions of standard finite elements with specialized non-smooth functions. The resulting approximation space can be used to solve problems with moving discontinuities, such as cracks, while avoiding the computational cost of remeshing. As the crack propagates, many artificial degrees of freedom are introduced near the crack tip, which can inflate the size of resulting linear system to be solved. In addition, the stiffness matrix of the cracked body may become ill-conditioned, causing slow convergence of iterative solvers. To overcome this, domain decomposition methods for solving the resulting linear systems of crack propagation problems is combined with XFEM to improve its performance. A suitable decomposition is proposed to avoid inter-subdomain boundaries near crack tip area. It is shown that choosing the proper FETI method, offers significant speedup compared to a direct solver that uses the common finite element solution techniques by means of Cholesky/LDL factorization, even if the execution is performed on a single-core systems.","PeriodicalId":414988,"journal":{"name":"Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131228811","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 : 1900-01-01DOI: 10.7712/120119.7081.19178
M. C. Varona, Raphael Gebhart, P. Bilfinger, B. Lohmann, D. Rixen
This paper presents a novel derivation for modal derivatives based on the Volterra series representation of nonlinear structural systems. After reviewing the classical derivation, new modal derivatives are proposed based on the employment of the Volterra theory and the variational equation approach. It turns out that the gained new derivatives are almost identical to the conventional ones, except for the fact that a sum/subtraction of eigenfrequencies results in our definition. In addition to the novel derivation, some possible impacts and applications of the new derivatives are presented and discussed, pursuing the aim that the conceptual results are also useful for practical purposes.
{"title":"A NOVEL DERIVATION FOR MODAL DERIVATIVES BASED ON VOLTERRA SERIES REPRESENTATION AND ITS USE IN NONLINEAR MODEL ORDER REDUCTION","authors":"M. C. Varona, Raphael Gebhart, P. Bilfinger, B. Lohmann, D. Rixen","doi":"10.7712/120119.7081.19178","DOIUrl":"https://doi.org/10.7712/120119.7081.19178","url":null,"abstract":"This paper presents a novel derivation for modal derivatives based on the Volterra series representation of nonlinear structural systems. After reviewing the classical derivation, new modal derivatives are proposed based on the employment of the Volterra theory and the variational equation approach. It turns out that the gained new derivatives are almost identical to the conventional ones, except for the fact that a sum/subtraction of eigenfrequencies results in our definition. In addition to the novel derivation, some possible impacts and applications of the new derivatives are presented and discussed, pursuing the aim that the conceptual results are also useful for practical purposes.","PeriodicalId":414988,"journal":{"name":"Proceedings of the 7th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2015)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132784258","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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