弧形预应力混凝土屋面箱梁的施工监测研究

施工监测关系到工程结构的安全，而目前行业内关于建筑工程中弧形预应力混凝土箱梁的工程施工监测研究很少.结合某学生活动中心场馆的工程实际，为确保施工过程的安全，针对屋面结构中受力较大的异形箱梁构件，制定了专门的监测方案，进行施工全过程跟踪监测.采用有限元分析软件Midas Gen对该场馆“蝴蝶形”屋面结构的施工过程进行数值模拟，按照实际施工步骤，利用单元生死技术分析了屋面关键构件箱梁的应力和位移变化过程，并将实际监测数据与数值模拟结果进行对比.研究表明,实际监测结果与模拟结果吻合较好，证明该施工模拟方法的可行性；施工过程中箱梁的应力及位移在可控范围内，满足施工验收要求.该工作和研究成果对建筑工程中类似大型异形构件的设计和施工有重要的参考价值.
Construction monitoring is related to the safety of engineering structure.However，the research of construction monitoring is limited in building engineering involved with curved prestressed concrete box girder.Combined with engineering practice of a student activity center venue，the monitoring scheme was made and conducted to ensure the safety in erection process for the curved box girder subjected to large force at the same time，and to keep tracking the whole process of construction.Construction simulation for a butterfly-shaped roof structure of the venue was conducted based on Midas Gen finite element software.According to the actual construction process and the element birth and death technology，the stress and displacement changing tendency of the roof box girder were analyzed in detail.The results derived by the monitoring and simulation were compared.The results show that the simulation method was validated by the good agreement between the results obtained from monitoring and simulation.The stress and displacement of the box girder are in control，and the construction scheme can satisfy the need of construction.The research results provide important reference for the design and construction of the similar large profiled component in building engineering.