Investigation on Load Path of a Latticed Shell Structure under Localized Fire Based on Member Sensitivity

Thermal expansion of a member can affect structural bearing capacity when one or more members are subjected to fire. To explore the developmental rule internal force in latticed shell structure, computation method sensitivity is presented based on alternate path method. Taking K8 single-layer structure as analysis object, finite element models established by ANSYS, applying temperature loads radial and circumferent ribs, calculating each during heating, exploring at different temperatures. It revealed from numerical results that fire, proportional inversely distance coefficient an index, will be transmitted along with high sensitivity, load redistribution given under elevated temperature.