Issue 1, 17, 2017

• Published on 01/01/17

  Carga axial de diseño de columnas de marcos con contraviento concéntrico

  Edgar Tapia-Hernandez, Rocío Paola Martínez Cid
   

  Abstract

  Se presenta un estudio de la variación de la carga axial en columnas decrujías contraventeadas bajo demandas sísmicas. Las columnas estudiadas forman parte de edificios regulares de 10, 14 y 18 pisos estructurados con marcos momento resistentes dúctiles de acero con contravientos en chevrón. Los edificios se analizaron con 10 acelerogramas artificiales que se escalaron conforme a un espectro de diseño para suelo blando. Los resultados se comparan con metodologías publicados para determinar la carga axial de diseño. Con base en los resultados, se propone un métodopara estimar la carga axial de diseño para columnas de marcos momento resistentes contraventeados.

  Abstract

  Se presenta un estudio de la variación de la carga axial en columnas decrujías contraventeadas bajo demandas sísmicas. Las columnas estudiadas forman parte de edificios regulares de 10, 14 y 18 pisos estructurados con marcos momento resistentes dúctiles de acero con contravientos [...]

  • 14
  •  read

• Accepted for publication on 25/06/17

  Carga axial de diseño de columnas de marcos con contravento concéntrico

  Tapia-Hernández Edgar
   

  Abstract

  A study of the variation in axial loads on columns of braced bays along earthquake is presented. Studied columns belong to regular buildings of 10-, 14- and 18- stories structured with moment-resisting ductile braced steel frames in a chevron configuration. Subject buildings were analyzed under 10 artificial records which were scaled according to the design spectrum for soft soils. The results were compared with published methodologies to estimate the design axial load in columns. Based on the results, a methodology for estimating the design axial load in columns of moment-resisting braced frames is proposed.

  Abstract

  A study of the variation in axial loads on columns of braced bays along earthquake is presented. Studied columns belong to regular buildings of 10-, 14- and 18- stories structured with moment-resisting ductile braced steel frames in a chevron configuration. [...]

  • 0
  •  read

• Accepted for publication on 06/07/17

  Efectos de inundación por la combinación de escorrentía superficial y marejada ciclónica durante el Huracán Georges en la costa este de Puerto Rico

  Felix Santiago-Collazo, Walter Silva Araya, Juan González-López, Javier Maldonado-Maldonado
   

  Abstract

  Puerto Rico (PR) is located in a hurricane prone zone. The purpose of this study was to determine the flooding effects caused by the combination of the storm surge and surface runoff discharge during the passage of Hurricane Georges along the East coast of PR. The system was modeled using a combination of tools including: a two-dimensional hydrologic model and simulations of storm surge using a high-resolution oceanic circulation model. A coupling technique was developed to integrate the storm surge model results into the hydrologic model. The results show that the combined effect of storm surge penetration and inland runoff produced by heavy rainfall deposited by Hurricane Georges increased flood levels in the coastal zone. Without considering these effects, flood levels provided by tides and wind driven circulation models only, could underestimate the real hazard conditions. The net effect depends on the watershed conditions, the spatial and temporal distribution of rainfall and the local conditions of the river morphology near the coastline. Even though peak discharge is usually used as an indicator of hazard conditions and regulations promote zero increase in peak discharge, water volumes play a major role in water levels during flood conditions. This is more important during storm surge because ocean water penetrates inland, increasing water volumes and flood depths.

  Abstract

  Puerto Rico (PR) is located in a hurricane prone zone. The purpose of this study was to determine the flooding effects caused by the combination of the storm surge and surface runoff discharge during the passage of Hurricane Georges along the East coast of PR. The system was modeled [...]

  • 0
  •  read

• Accepted for publication on 17/06/17

  Impacto de la rigidez de la losa y la asimetría de las aberturas en la estimación de los desplazamientos laterales elásticos de muros

  Arturo Tena Colunga, Angel Eduardo Liga-Paredes
   

  Abstract

  Approximations obtained with the equivalent frame method and Beck-Coull method to assess elastic lateral displacement profiles of walls with openings are compared to results obtained with the finite element method using reasonably fine meshes. Multistory walls were studied, considering symmetric and asymmetric distribution of openings with respect to a vertical axis. The contribution of slabs in the lateral stiffness was considered through an equivalent flange as recommended in several building codes. Different stiffnesses are considered for the walls and the slabs. From the obtained results it is confirmed that approximations obtained with the studied methods increase as the number of stories of the wall increases, and that it is reasonable for an equivalent opening eccentricity up to 40%. The contribution of the stiffness of the slab had a small impact for the considered symmetric wall openings, but it was important for walls with asymmetric openings, impacting more the displacements of walls when they are more flexible.

  Abstract

  Approximations obtained with the equivalent frame method and Beck-Coull method to assess elastic lateral displacement profiles of walls with openings are compared to results obtained with the finite element method using reasonably fine meshes. Multistory walls were studied, considering [...]

  • 0
  •  read