Fire Resistance Analysis of Prestressed Steel Structure Based on the Study of High Temperature Mechanical Properties of Steel Strands

On the basis of existing test data high temperature mechanical properties 1860 grade steel strands, a regression model performance strands that can be used for theoretical analysis and numerical calculation is obtained. Based on non-stationary field in fire tall large space buildings, non-linear finite element method considering time integral effect to establish resistance large-span prestressed structure. Through fire-resistance example Beam String Structure, influence different source positions structures discussed.