A unified approach for steel and composite beams with web openings

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A unified approach for steel and composite beams with web openings

 

Author: Ko, Chi-hang
Title: A unified approach for steel and composite beams with web openings
Degree: M.Phil.
Year: 2002
Subject: Hong Kong Polytechnic University -- Dissertations
Girders
Composite construction
Building, Iron and steel
Load factor design
Department: Dept. of Civil and Structural Engineering
Pages: 1 v. (various pagings) : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1637846
URI: http://theses.lib.polyu.edu.hk/handle/200/2565
Abstract: A unified design method incorporating tee-section approach and perforated section approach is developed. The method provides a harmonized design method for steel beams and composite beams with web openings of various sizes and shapes. Hot rolled or fabricated compact steel sections with symmetric cross-section geometry are covered. No local buckling problem is considered. In the tee-section approach, simple design formulas for the determination of plastic moment resistances of both composite tee-sections and steel tee-sections at the low moment side and the high moment side of the web openings under co-existing axial force and shear force are derived analytically based on plastic stress blocks. The beneficial effect of axial force on the moment resistances is identified. Complete shear-axial-moment interaction curves are produced for the tee-sections. In order to assess the load capacities of beams with web openings, the design formulas from the tee-sections approach are extended for the analyses of the entire perforated sections by considering the equilibrium of forces around the web openings. Moment-shear interaction curves are generated for steel beams with web openings and the results are compared with those obtained from a separate finite element study. Similar moment-shear interaction curves for composite beams with web openings are also produced and discussed. Harmonized design of beams with web openings of different shapes is achieved through the use of equivalent octagonal openings. Transformation expression for steel beams with circular web openings has been proposed. Moment-shear interaction curves for these beams have also been generated and compared with finite element results. Over a hundred test data have been collected from various sources and a comprehensive database is established. Forty test data of composite beams with rectangular web openings, fourteen test data of steel beams with rectangular web openings, and nine test data of steel beams with circular web openings are selected from the database for the calibration of the proposed unified design method with the use of a specifically developed computer program. The proposed unified design method is considered to be straightforward and easy to understand. It may facilitate practicing engineers to take advantages of composite construction to build commercial buildings with improved performance and full integration with building services. Furthermore, based on the step-by-step design procedures provided, engineers will be able to perform quick and practical scheming design on steel and composite beams with large web openings.

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