山东理工大学学报（自然科学版）

大跨度屋盖钢结构体系组成复杂，而卸载造成的结构内力重分布过程是影响施工安全的关键。基于福建某体育场对拉双拱屋盖钢结构卸载施工与监测方案，提出了针对该类型大跨结构的卸载安全监测技术。通过数值模拟分析了对拉双拱钢结构的卸载力学特性，确定了卸载方案与卸载监测方案，并实时监测了卸载阶段的结构应力、变形和温度。数值模拟和监测结果表明：卸载过程中位移和应力的实测值与模拟值较为吻合，实测温度应力处于设计范围内；延长监测周期后，结构应力和变形趋于稳定，说明有限元模拟可以指导施工顺利进行，监测方案的设计可以确保结构在卸载过程中的安全。

The composition of the large-span roof steel structure system is complex, and the redistribution process of structural internal forces caused by unloading is critical for construction safety. Based on the unloading construction and monitoring program of a tensile double-arch roof steel structure in a stadium in Fujian, an unloading safety monitoring technology for this type of large-span structure was proposed. The unloading mechanical characteristic analysis of the tensile double-arch steel structure was carried out through numerical simulation, and the unloading scheme and unloading monitoring scheme were determined to monitor the structural stress, deformation, and temperature effects in real time during the unloading stage. The numerical simulation analysis and monitoring results indicate that the measured displacements and stresses in the unloading process were in good agreement with the simulated values, and the measured temperature stresses were within the design range. Furthermore, after prolonging the monitoring cycle, the structural stresses and deformations tended to stabilize, which verifies that the finite element simulation can effectively guide the smooth progress of the construction and that the design of the monitoring scheme can ensure the safety of the structure in the unloading process.