基于碎片化分区的桥梁网络震后修复优先级分析与优化

ANALYSIS AND OPTIMIZATION OF POST-EARTHQUAKE RESTORATION PRIORITY OF BRIDGE NETWORK UPON FRAGMENTATION

  • 摘要: 为了研究区域性桥梁的抗震优化问题,针对城市桥梁网络的震后修复优先级,引入基于交通密度的网络碎片化分区方法(FaDPa),提出了考虑恢复性和经济性的双重韧性指标,并针对震后短时抢救以及长时修复的时段特征引入了分阶段优化方法,尤其在长时修复阶段基于不同的修复需求对其进行了分时期处理;在抢险救灾阶段和长时修复阶段分别融入碎片化理论,前者以恢复韧性、时间为目标对抢救顺序进行优化,后者以综合韧性、碎片恢复性、时间对修复顺序进行优化。研究结果表明:基于密度的碎片化理论对桥梁网络不同修复阶段的地震损伤程度做出了不同的划分,此基础上展开的分阶段修复工作在抢险救灾过程中对其综合韧性提升程度达到52.3%,在长期修复过程中不影响韧性优化的前提下增加了碎片恢复性,其功能水平提升可达20.3%;修复优化阶段,经过考虑不同修复方向的双重韧性指标以及分时期处理的优化理论可以根据决策者的需求进行灵活调整,且面临不同修复环境时都具有一定的适应性。

     

    Abstract: In order to study the seismic restoration of regional bridges, aiming at the post-earthquake repair priority of urban bridge networks, a network fragmentation partitioning method (FaDPa) based on traffic density was introduced, and a dual toughness index considering recovery and economy was proposed, and a phased optimization method was introduced according to the time period characteristics of short-term rescue and long-term restoration after earthquake, especially in the long-term restoration stage based on different restoration needs. The fragmentation theory was applied to the rescue and relief stage and the long-term repair stage respectively. The former optimized the rescue order with recovery toughness and time as the target, while the latter optimized the repair order with comprehensive toughness, debris recovery and time. The result shows that the fragmentation theory proposed makes different divisions based on density for the seismic damage degree of different repair stages of the bridge network. The staged repair work on this basis has improved its comprehensive toughness by 52.3% in the process of emergency rescue and disaster relief. Under the premise of not affecting the toughness optimization in the long-term repair process, the fragmentation resilience is increased, and its functional level is increased by 20.3%. In the repair optimization stage, the dual toughness index considering different repair directions and the optimization theory of time-phase processing can be flexibly adjusted according to the needs of decision makers, so that it can adapt to different repair environments, and the repair results considering fragmentation theory supplement the reliability of repair from different dimensions.

     

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