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Simulation Analysis on Construction Processes of Long-Span and Complex Steel Frames with Inclined Pillars
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摘要: 以某遗址保护工程大跨斜柱钢框架建筑为依托建立了有限元模型并对施工全过程进行模拟分析。基于现场实际情况,考虑了遗址原土堆载的影响,对模型进行优化并调整施工阶段,将预应力三阶段张拉方案调整为两阶段张拉方案,得到结构施工过程中斜柱支承系统各构件关键截面应力和桩顶位移,并与相应测点实测数据对比。结果表明:理论值与实测值吻合较好,各构件关键截面应力和桩顶位移均在容许范围内,两阶段张拉方案比较合理且能够保证结构施工过程的安全性;考虑遗址原土堆载的桩简化模型一定程度上能反映斜柱支承系统构件内力及桩顶位移变化规律,具有一定的实用性。Abstract: Based on a long-span and complex steel frames building with inclined pillars in a relic protection project, the finite element model was constructed to simulate the whole process of construction. Based on the actual situation of the site, considering the influence of the original soil piled up, the model was optimized and the construction process was adjusted, and the prestressed three-stage tensioning scheme was adjusted to a two-stage tensioning scheme; the stress in crucial sections of inclined pillar support system and the displacement of pillar tops were obtained during the construction process of the structure and compared with the measured data of the corresponding measuring point. The results showed that the theoretical values were in good agreement with the measured values. The crucial section stress and pile top displacement of each members were within the allowable range. The two-stage tensioning scheme was reasonable and could ensure the safety of the construction process of the structure. The simplified model of the piles could reflect the internal forces of the members of the inclined pillar support system and the displacement of the pile tops displacement to a certain extent, and had certain practicability.
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