THE RESEARCH ON SENSITIVITY OF STABLE BEARING CAPACITY OF CROSS-LAYER AND HEAVY-LOAD TRUSS STRUCTURE TO INITIAL IMPERFECTION

In order to study the sensitivity of the Daqing West Railway Station's cross-layer and heavy-load plane truss structure to initial imperfection，based on the large displacement control theory LDC method，it was put forward static-deformation buckling analysis method to determine the initial imperfection of this truss structure． Using this method，it was also researched the nonlinear stability bearing capacity of plane truss structure under six kinds of initial imperfections，which was compared with the results of consistent imperfect buckling analysis method． It was made clear the geometrical imperfection sensitivity of the plane truss structure． Part of the results was compared with the scale model test results． Ｒesearches showed that geometrical imperfection had smaller influence on the bearing capacity of the structure，but greater influence on the structure deformation and stability． Through comparison and analysis，the static deformation buckling analysis method could be used as an effective method for calculating the bearing capacity of the structure stability．