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Storey-based stability analysis of multi-storey unbraced frames

Structural engineering and mechanics : An international journal v.19 no.6 , 2005년, pp.679 - 705  
Liu, Y. (Department of Civil Engineering, University of Waterloo ) ;  Xu, L. ( Department of Civil Engineering, University of Waterloo)
Abstract

This paper presents a practical method to evaluate the effective length factors for columns in multi-storey unbraced frames based on the concept of storey-based elastic buckling by means of decomposing a multi-storey frame into a series of single-storey partially-restrained (PR) frames. The lateral stiffness of the multi-storey unbraced frame is derived and expressed as the product of the lateral stiffness of each storey. Thus, the stability analysis for the multi-storey frame is conducted by investigating the lateral stability of each individual storey, which is facilitated through decomposing the multi-storey frame into a series of single-storey PR frames and applying the storey-based stability analysis proposed by the authors (Xu and Liu 2002) for each single-storey PR frame. Prior to introducing decomposition approaches, the end rotational stiffness of an axially load column is derived and rotational stiffness interaction between the upper and lower columns is investigated. Three decomposition approaches, characterized by means of distributing beam-to-column rotational-restraining stiffness between the upper and lower columns, are proposed. The procedure of calculating storey-based column effective length factors is presented. Numerical examples are then given to illustrate the effectiveness of the proposed procedure.

주제어

#column effective length   #lateral stability   #multi-storey unbraced frame   #storey-based buckling  

참고문헌 (17)

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이 논문을 인용한 문헌 (5)

  1. 2007. "" Structural engineering and mechanics : An international journal, 26(4): 441~457 
  2. 2007. "" Structural engineering and mechanics : An international journal, 26(6): 651~672 
  3. 2007. "" Structural engineering and mechanics : An international journal, 27(3): 293~310 
  4. 2009. "" Steel & Composite structures : an international journal, 9(6): 499~518 
  5. 2010. "" Structural engineering and mechanics : An international journal, 35(4): 431~457 

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