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Chuang-Sheng Yang, Roberto T. Leon, Reginald DesRoches
This paper presents the results from an experimental program on the behavior of special inverted-V braced frames with suspended zipper struts subjected to pushover loading. The model tested was a one-third-scale frame designed on the basis of a procedure proposed by the …
José Wilches, Roberto T. Leon, Hernán Santa María, Anibal Graterol
Abstract Connections between concrete filled members are common in tall buildings, bridges, and offshore structures because of their robust structural performance. While extensive research has been done on isolated concrete-filled structural members, relatively little research has been conducted on composite connection regions. …
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Luis Antonio Díaz, Sérgio Britto Garcia, Rayan Khan, Gustavo Ayares et autres
Although the WHO strategy aims to eliminate the hepatitis C virus (HCV) as a public health threat by 2030, national strategies are variable worldwide. This study aimed to assess the establishment of different policies and strategies to eliminate HCV in the Americas. …
cl, ca, us, gt, ar, bo, br (code pays fourni par la source)
Roberto T. Leon, Jay Harris, Conrad Paulson
The USA has a very significant stock of existing steel buildings that were built before modern design provisions were incorporated into design codes for seismic and hurricane actions. Until about 10 years ago, evaluation and retrofit of structures were based on two …
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The rehabilitation of existing structures and the incorporation of functional recovery principles for new structures are themes of great relevance for structural engineers in the USA today. Sustainability and community resilience paradigms require that building owners carefully assess conditions of existing infrastructure …
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William N. Collins, Tristan Yount, Ryan J. Sherman, Roberto T. Leon et autres
Impact energy tests are an efficient method of verifying adequate toughness of steel prior to it being put into service. Based on a multitude of historical correlations between impact energy and fracture toughness, minimum impact energy requirements that correspond to desired levels …
us (code pays fourni par la source)
Dan V. Bompa, Ahmed Y. Elghazouli, T. Bogdan, Matthew R. Eatherthon et autres
This paper examines the cyclic performance of reduced beam section (RBS) moment connections incorporating larger member sizes than those allowed in the current seismic provisions for prequalified steel connections, through experimentally validated three-dimensional nonlinear numerical assessments. Validations of the adopted nonlinear finite …
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Abstract This paper briefly reviews the evolution of composite codes in the USA in the context of important changes for the 2022 edition of the American steel design specification for buildings Major changes include the incorporation of composite walls as a new …
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Daniel Salinas, Ioannis Koutromanos, Roberto T. Leon
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Dan V. Bompa, T. Bogdan, Ahmed Y. Elghazouli, Edurne Nuñez et autres
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José Wilches, Roberto T. Leon, Hernán Santa María, Claudio Fernández et autres
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