Analysis of vulnerability and ultimate bearing capacity of cable-stayed bridges
Based on the parametric vibration theory of the cable,the fundamental frequency of the cable,the stress trans-fer coefficient of the cable and the stress safety factor of the main beam are calculated and analyzed in a single pail cable-stayed bridge.Using Pareto multi-objective evaluation method,according to the optimization principle that the minimum damage ratio of the structure causes the minimum residual strength,the vulnerability of the cable under the single pair of broken cable damage scenario is studied,and the vulnerable cable order and the influence of the cable on the ultimate bearing capacity of the structure are determined.The results show that the outer cable of the cable-stayed bridge is more prone to parametric resonance.The Z6,Z8,and Z9 cables of the main span are vulnerable in the single pair cable damage scenario.The effect of single pair of side span cable fracture on the ultimate bearing capacity of the structure is less than 2％,and the fracture of main span cable Z6 reduces the ultimate bearing capacity of the structure by 14.5％.The re-search results can provide theoretical basis and reference for the study of vulnerable and weak parts of the cables of single-tower cable-stayed Bridges,the selection of key cable numbers for bridge health monitoring and the improvement of struc-tural safety.
single-pylon cable-stayed bridgestructural vulnerabilityparametric resonancebreak the ropeultimate bearing capacitystructural health monitoring
万方数据
维普
