NUMERICAL INVESTIGATIONS INTO STABILITY AND DESIGN OF ARCHES WITH WEB OPENINGS
Yan-Lin Guo 1, Jia-xin Wang 1* and Peng Zhou 1
1 Department of Civil Engineering, Tsinghua University, Beijing, China
Steel Arch With Web Openings (SAWWO) consists of two chord members with spacing, where they are interconnected discontinuously through multiple flat-batten-plates to form an integrated steel arch. In this study, the formula for predicting in-plane global elastic buckling load of the SAWWO under pure axial compression has been initially derived, and it is validated by finite element analysis (FEA). By not considering local buckling for all components of the arch through limiting the slenderness of the chords and the height-to-thickness ratio of the webs, the normalized slenderness of the arch under pure axial compression, and the stability coefficient of the arch are introduced to account for the overall buckling and cross-sectional plasticity. Accordingly, a φ-λn curve of the arch for predicting its load resistance is then proposed. Moreover, the in-plane instability mechanisms, failure modes and load resistance of the arch under a uniform radial load, a full-span uniform vertical load (FSUVL), a half-span uniform vertical load (HFUVL) and their combined actions have been investigated respectively. As a result, a general strength design method is therefore established based on the research findings.
Steel arch with web openings (SAWWO); Overall elastic buckling load; Load resistance; Instability mechanism; Design method; Finite element analysis (FEA)