Experimental Evaluation of Flexural Performance Evaluation of Tapered H-Section Beams with Slender Web

춤이 큰 웨브 변단면 H형 보의 휨내력에 대한 실험적 평가

  • Received : 2007.04.02
  • Accepted : 2007.10.04
  • Published : 2007.10.27

Abstract

Pre-Engineering Building (PEB) system is one of the most economical structural systems. Tapered members can resist a maximum stress at a single location, whereas stresses of the rest of the members are considerably low. This results in appreciable savings both in terms of materials and construction costs. However, it was appreciated that special consideration would be required for certain aspects of this structural form. In particular, because of their slenderness, webs would buckle laterally and torsionally under the combined action of excessive axial, bending and shear forces. In this study, a total of four large-scale rafters with simple ends were tested. The main parameters were the width-thickness ratio of the web, the stiffener, and the flange brace. The purpose of this experiment is to evaluate the structural stability and to offer back-data on PEB design.

최근 대형 장스팬 규모에 많이 적용되는 PEB 시스템은 휨모멘트의 크기에 따라 부재형상을 최적화 한 변단면부재를 사용함으로써 경제적인 경쟁력을 갖는 구조시스템이다. 그러나 PEB 시스템의 관련기술은 대부분 외국에서 수입된 것으로 구조거동에 관한 연구 및 국내 설계규준이 미비하다. 특히 PEB 시스템에서의 변단면부재(래프터)들은 비조밀단면(noncompact section) 또는 세장단면(slender section)을 갖는 경우가 많으므로 좌굴에 대한 영향을 많이 받게 된다. 따라서 본 연구에서는 웨브의 판폭두께비, 스티프너 유무, 횡비지지길이 등을 변수로 하여 총 4개의 실대형 실험체를 제작 휨성능 실험을 수행하였다. 이에 대하여 세장한 웨브 변단면 부재의 구조 안정성을 실험적으로 평가하고 PEB 시스템의 설계를 위한 기초자료를 제공하고자 한다.

Keywords

References

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