Explosive testing to assess dynamic load redistribution in a reinforced concrete frame building
department or school: Applied Science, Faculty of
department or school: Civil Engineering, Department of
data provider: DSpace
degree campus: UBCV
creator: Matthews, Timothy William
issued: 2011-03-03T06:54:23Z
issued: 2007
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: Guidelines have been developed in the United States to assist in the design of buildings resistant to progressive collapse. These guidelines outline several methods for considering the effects of dynamic amplification on load redistribution following sudden member failure in a structure. Previous analytical studies have been performed to evaluate the consistency of these guidelines, but very little testing has been conducted to verify the guidelines and analytical work performed to date. This study investigates the dynamic load redistribution occurring in a field test on a two-storey reinforced concrete frame specimen. The test consisted of removing a column with explosives and recording the deformations of the remaining columns in the structure. The explosives removed the load-carrying capacity of the column but also exerted an upward force on the structure. Observations from the test suggest the building frame remained linear-elastic. A linear analytical model of the test specimen was developed in ETABS. This model effectively captured the response of the structure during testing. The model was used to examine the response of the test specimen due to gravity load redistribution alone, as well as the total response of the structure, including the effects of the upward force from the explosion. A dynamic amplification factor of 1.89 was observed for the columns where the majority of the gravity load redistributed during in the experimental test. This value supports the maximum dynamic amplification of 2.0 proposed for linear structures by previous research and progressive collapse assessment guidelines. The response at these columns was dominated by one mode of vibration. At columns where less steady-state load was redistributed, dynamic amplification factors much greater than 2.0 were observed, although the absolute peak axial force increases were relatively small. Higher modes influenced by cantilevers along one side of the structure contributed significantly to t…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/31999
note: EXPLOSIVE TESTING TO ASSESS DYNAMIC LOAD REDISTRIBUTION IN A REINFORCED CONCRETE FRAME BUILDING by T I M O T H Y W I L L I A M M A T T H E W S B.Sc. C i v i l Engineering, University of Alberta, 2002 A THESIS S U B M I T T E D IN P A R T I A L F U L F I L M E N T OF T H E R E Q U I R E M E N T S F O R T H E D E G R E E O F M A S T E R OF A P P L I E D S C I E N C E in T H E F A C U L T Y OF G R A D U A T E S T U D I E S (Civ i l Engineering) T H E U N I V E R S I T Y OF B R I T I S H C O L U M B I A October 2007 © Timothy Wi l l i am Matthews, 2007 ABSTRACT Guidelines have been developed in the United States to assist in the design of buildings resistant to progressive collapse. These guidelines outline several methods for considering the effects of dynamic amplification on load redistribution following sudden member failure in a structure. Previous analytical studies have been performed to evaluate the consistency of these guidelines, but very little testing has been conducted to verify the guidelines and analytical work performed to date. This study investigates the dynamic load redistribution occurring in a field test on a two-storey reinforced concrete frame specimen. The test consisted of removing a column with explosives and recording the deformations of the remaining columns in the structure. The explosives removed the load-carrying capacity of the column but also exerted an upward force on the structure. Observations from the test suggest the building frame remained linear-elastic. A linear analytical model of the test specimen was developed in E T A B S . This model effectively captured the response of the structure during testing. The model was used to examine the response of the test specimen due to gravity load redistribution alone, as well as the total response of the structure, including the effects of the upward force from the explosion. A dynamic amplification factor of 1.89 was observed for the columns where the majority of the gravity load redistri…
has type: Thesis/Dissertation
is shown at: 10.14288/1.0101050
language: eng
degree discipline: Civil Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/31999