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Study of Effective Length Coefficient of Frame Column with Semi-Rigid Connections

Author: HaoJin
Tutor: DaiSuJuan
School: Shandong University of Science and Technology
Course: Structural Engineering
Keywords: Length Factor semi-rigid In sway No lateral displacement Buckling equation
CLC: TU391
Type: Master's thesis
Year: 2008
Downloads: 24
Quote: 0
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Abstract


Stable steel frame column design, required to calculate the length of the component l 0 calculation of length l 0 = the μl c coefficient μ called the calculated length coefficient. For rigid Steel Frames, the current design of steel structures (GB50017-2003) has been given a specific calculation results and tables. However, the stiffness of the connection used in the practice, are not entirely rigid connection or hinge, are in between the two, i.e. a so-called semi-rigid connection. The current design of steel structures for semi-rigid beams and columns connect this type of frame column length only general provisions described specific calculations and tables, therefore, how to determine the semi-rigid connection frame column length The steel frame design reasonable and has an important significance. Current calculated length coefficient derived under certain assumptions, did not fully consider the calculated length coefficient factors affecting the frame column, This article analyzes the various possible factors affect pillars calculated length coefficient;-depth study of a semi-rigid on The steel frame of column length coefficient. Both ends of the semi-rigid connections on both ends of the semi-rigid axial compression members balance equation derivation Sway and lateral displacement axial compression members buckling equation using matlab software for solving the equation obtained calculate the length of a single member in the different constraints coefficient values; approximation, angular displacement equation and three-column frame model derived with semi-rigid constraint node sway and sway steel frame length of columns coefficient formula, applied when rigid connections and semi-rigid connection conditions derived calculate the length of the value, the relative error is less than 5%, you can ignore the semi-rigid. Correction formula to consider when frame column and not at the same time lead to the column column critical bearing capacity and the framework of the overall instability actual uneven force breaks instability. The study results show that: for the sway steel frames, semi-rigid to its calculated length coefficient is significantly higher than the non-sway steel frame; semi-rigid column and foundation hinged Length Factor just pick higher than the pillar and foundation when; higher than the underlying semi-rigid top frame column. In this paper, we consider a semi-rigid effect obtained the effective length factor, not only can the structural design safer, more in line with the structure of the actual stress situation.

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CLC: > Industrial Technology > Building Science > Building structure > Metal structures > Steel
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