ANALYSIS OF DESIGN AND CONSTRUCTION INTEGRATION OF RIGID BRACING DOME

Rigid bracing dome is a new type of prestressed space structure，its upper part is a cable net system，and the lower part is a rigid rods supporting system，and the rigid rods of lower part are high strength steel tie rod except the brace rod． From the perspective of engineering application，the methods and steps for analysis of design and construction integration were given，and the key problems were pointed out． The key parameters for determining the geometric shape are span，rise，circumferential equivalent fraction，total number of radial divisions and node coordinate，and the parameters should be determined according to the concrete requirements of engineering practice， relevant specifications and high-strength steel tie rod materials． A new node of brace rod was given and determining method of key parameters also was given． The construction methods of node-by-node assembling and integral tensioning and lifting and concrete installation steps were provided． Simulation analysis was conducted on the construction process by FEDR ( finite element dynamic relaxation) method． The research results provided necessary theoretical reference for design and construction of engineering practice of rigid bracing dome．