Analytical and Numerical Investigation of Detachable Short Links with Flush and Extended-End Plate Connections
Analytical and Numerical Investigation of Detachable Short Links with Flush and Extended-End Plate Connections
Type of document
diplomová prácemaster thesis
Author
Saflor Lourrey May
Supervisor
Landolfo Raffaele
Opponent
De Martino Attilio
Field of study
Sustainable Constructions under Natural Hazards and Catastrophic EventsStudy program
Civil EngineeringInstitutions assigning rank
katedra ocelových a dřevěných konstrukcíDefended
2018-02-01Rights
A university thesis is a work protected by the Copyright Act. Extracts, copies and transcripts of the thesis are allowed for personal use only and at one?s own expense. The use of thesis should be in compliance with the Copyright Act http://www.mkcr.cz/assets/autorske-pravo/01-3982006.pdf and the citation ethics http://knihovny.cvut.cz/vychova/vskp.htmlVysokoškolská závěrečná práce je dílo chráněné autorským zákonem. Je možné pořizovat z něj na své náklady a pro svoji osobní potřebu výpisy, opisy a rozmnoženiny. Jeho využití musí být v souladu s autorským zákonem http://www.mkcr.cz/assets/autorske-pravo/01-3982006.pdf a citační etikou http://knihovny.cvut.cz/vychova/vskp.html
Metadata
Show full item recordAbstract
Along with the increasing utilization of steel in -capacity design of structures, an eccentrically braced frame (EBF) is one of the structural typologies introduced with links acting in bending and/or shear to resist horizontal forces. With efficiency considerations in post-seismic repair of structures, detachable seismic links have also been introduced. With these devices, only the links need to be replaced while the other members continue to be structurally appropriate to function. Studies have shown that there is significant development of axial force in links, but they are not considered in established design procedures. Considering this gap, this parametric study aims to achieve a more thorough grasp of shear overstrength and axial force as influenced by different parameters such as length ratio, strength of connection, stiffness, and boundary conditions. Twenty-five flush-end plate (FEP) and 15 extended-end plate (EEP) connections for short links are designed using the component method until Method 1 of link verifications are satisfied. The same configurations are also verified according to Methods 2 and 3. Numerical analyses are performed on the 40 models using FE software Abaqus 6.14 considering two boundary conditions: with fully rigid restraints and with deformable springs. From the analytical perspective, FEP connections have design limitations and cannot be used for all length ratios of HEB profiles, nor for 0.75es and es of HEA profiles. On the other hand, EEP connections have a wider range of application. For all analyses of assemblies performed, the values of shear overstrength at 0.08 rad link rotation are consistently close to 1.5 (1.4 to 1.66). The shear overstrength is also observed to decrease along with the increase of profile depth and/or length ratio. Moreover, wide-flange profiles have higher shear overstrength than narrow-flange profiles. In terms of axial force, there are also several parameters that affect the behaviour of its development. The imposed boundary conditions that represent the stiffness of the frame has significant effect on the level of axial forces, with higher forces for fully rigid BC and lower values for deformable springs. Short length ratio, low strength of connection, and high stiffness have been observed to affect the level catenary action in links, resulting to large compressive arches and lower tensile force (if the tension zone is reached). Lastly, tensile forces are found to be more detrimental than compressive forces in terms of bending resistance of the link-connection assembly. Along with the increasing utilization of steel in -capacity design of structures, an eccentrically braced frame (EBF) is one of the structural typologies introduced with links acting in bending and/or shear to resist horizontal forces. With efficiency considerations in post-seismic repair of structures, detachable seismic links have also been introduced. With these devices, only the links need to be replaced while the other members continue to be structurally appropriate to function. Studies have shown that there is significant development of axial force in links, but they are not considered in established design procedures. Considering this gap, this parametric study aims to achieve a more thorough grasp of shear overstrength and axial force as influenced by different parameters such as length ratio, strength of connection, stiffness, and boundary conditions. Twenty-five flush-end plate (FEP) and 15 extended-end plate (EEP) connections for short links are designed using the component method until Method 1 of link verifications are satisfied. The same configurations are also verified according to Methods 2 and 3. Numerical analyses are performed on the 40 models using FE software Abaqus 6.14 considering two boundary conditions: with fully rigid restraints and with deformable springs. From the analytical perspective, FEP connections have design limitations and cannot be used for all length ratios of HEB profiles, nor for 0.75es and es of HEA profiles. On the other hand, EEP connections have a wider range of application. For all analyses of assemblies performed, the values of shear overstrength at 0.08 rad link rotation are consistently close to 1.5 (1.4 to 1.66). The shear overstrength is also observed to decrease along with the increase of profile depth and/or length ratio. Moreover, wide-flange profiles have higher shear overstrength than narrow-flange profiles. In terms of axial force, there are also several parameters that affect the behaviour of its development. The imposed boundary conditions that represent the stiffness of the frame has significant effect on the level of axial forces, with higher forces for fully rigid BC and lower values for deformable springs. Short length ratio, low strength of connection, and high stiffness have been observed to affect the level catenary action in links, resulting to large compressive arches and lower tensile force (if the tension zone is reached). Lastly, tensile forces are found to be more detrimental than compressive forces in terms of bending resistance of the link-connection assembly.
Collections
- Diplomové práce - 11134 [602]
Related items
Showing items related by title, author, creator and subject.
-
Porovnání příčin leteckých nehod z pohledu odborného zjišťování a z pohledu pojišťoven
Author: Plos Vladimír; Supervisor: Němec Vladimír; Opponent: Mrázek Petr
(České vysoké učení technické v Praze. Vypočetní a informační centrum., 2011-10-14) -
Investigation of Aggregate Influence on Fracture Properties of Mortars by Finite Element Analysis
Author: Antoš Jakub; Supervisor: Zeman Jan; Opponent: Vorel Jan
(České vysoké učení technické v Praze. Vypočetní a informační centrum., 2013-06-28) -
Investigation of effect of concrete quality on structural behavior of selected elements
Author: Manos Anastasios; Supervisor: Štemberk Petr
(České vysoké učení technické v Praze. Vypočetní a informační centrum., 2014-06-28)