Joint Operation of Large-Span Trusses and Purlins in the Calculation of Progressive Collapse

One of the topical areas of modern design is the calculation of the stability of structures to progressive collapse. Large-span steel structures are widely used in both industrial and civil engineering. The study of the problem of resistance of steel frames to progressive collapse will reduce the risk of accidents. The study is devoted to the joint work of steel large-span roof trusses with purlins. As part of the study, a coating with a span of 12 m with trussed girders with a typical arrangement of ties and coating with an additional vertical truss was considered. For each of the options, the stress-strain state of the coating structures was studied in case of local damage to the element of the upper or lower belt of the truss. The possibility of including purlins in the work in case of damage to one of the elements of the truss belt has been studied. Numerical calculations were carried out in a quasi-static formulation, taking into account the nonlinear operation of the coating elements. For each coating variant, the maximum displacements and forces in the elements are determined, and a check was performed for the first group of limit states. Numerical studies have shown that with a typical arrangement of coating ties, the rigidity of the purlins is not enough to effectively redistribute the load from damaged elements to neighboring ones. The forces in the purlins that occur when the truss is damaged significantly exceed the bearing capacity of the purlins. Installing an additional longitudinal vertical truss can significantly reduce the deformation of the coating and more effectively redistribute forces in case of local damage.

A.R. TUSNIN, Doctor of Sciences (Engineering), Professor, Head of the Department of Metal and Wooden Structures (This email address is being protected from spambots. You need JavaScript enabled to view it.),
M.P. BERGER, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
T.V. GALSTYAN, postgraduate (This email address is being protected from spambots. You need JavaScript enabled to view it.)

National Research Moscow State University of Civil Engineering (26, Yaroslavskoe Highway, Moscow, 129337, Russian Federation)

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