Optimized Design of Ultra-long Prestressed Steel Bundles for Large Span Continuous Rigid Frame Bridges
For long prestressed steel beam overall loss will cause large span continuous rigid bridge span of continuous scratching and web cracking,based on the optimization design of the reasonable bridge state,to reduce the resistance loss of the control target,put for-ward two parallel staggered anchor and segment anchor optimization scheme,and the main beam deflection,stress and prestress reserve ability of comparative analysis.The results show that the prestressed reserve of parallel staggered anchorage and segmented anchorage increased by 21.53%and 20.76%respectively,and the bending degree of the middle stage of the bridge was reduced by 14.28%and 88.91%respectively.The two optimization schemes can improve the carrying capacity of the structure,but the improvement effect is more obvious than that of the parallel staggered anchorage scheme.
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