基于AHP-熵权法的跨燃气管道现浇梁施工风险评价

为保障某跨燃气管道现浇梁施工安全,建立现浇梁BIM模型进行动态施工模拟,找出影响现浇梁施工的风险因素,从地质条件、外界影响、安全管理3个方面建立了跨燃气管道现浇梁施工风险评价体系;结合“熵”理论和层次分析法综合确定各影响因素权重并对现浇梁施工风险进行模糊综合评价;研究表明:①通过BIM动态模拟,直观全面地识别出施工风险,对现场施工风险超前预报。②通过结合层次分析法与熵理论,对4座桥墩施工风险进行模糊综合评价,左幅23#属于严重Ⅳ,右幅23#属于严重Ⅳ,左幅22#属于中等Ⅲ,右幅22#属于不严重Ⅱ。③根据风险评估结论提出了应对措施和策略,为安全施工明确了方向。

Construction Risk Assessment of Cast-in-place Beams Across Gas Pipeline Based on AHP-Entropy Weight Method

In order to ensure the construction safety of cast-in-place beam of a span gas pipeline,the BIM model of cast-in-place beam is established for dynamic construction simulation,and the risk factors affecting the construction of cast-in-place beam are found out.The construction risk evaluation system of cast-in-place beam across gas pipeline is established from three aspects of geological conditions,external influence and safety management,and the weight of influencing factors is determined comprehensively by combining Entropy theory and Analytic hierarchy Process(AHP),and the construction risk of cast-in-place beam is evaluated by fuzzy comprehensive evaluation.The research shows that:①through BIM dynamic simulation,the construction risk is identified intuitively and comprehensively,and the site construction risk is predicted in advance.②Through the combination of Analytic Hierarchy Process and Entropy Theory,the construction risk of four piers is fuzzy comprehensive evaluation.The left amplitude 23#belongs to serious IV,the right amplitude 23#belongs to serious IV,the left amplitude 22#belongs to mediumⅢ,and the right amplitude 22#belongs to non-seriousⅡ.③According to the conclusion of risk assessment,the corresponding measures and strategies are put forward,which defines the direction for safe construction.