基于全过程监测的大跨混凝土现浇梁组合支架体系工作性能分析

唐子超¹，仉洁²，胡莲生¹，孔祥民¹，崔凤坤^2*

1.中建八局第二建设有限公司，山东 济南  250022；2.山东交通学院交通土建工程学院，山东 济南  250357

摘要：为分析大跨混凝土现浇梁组合支架体系的实际工作性能，避免施工过程中支架倾覆事故，优化结构冗余设计，以济南市有轨电车项目三跨连续梁桥为依托，通过布设高精度传感器构建监测系统，采用全过程实时监测与有限元模拟相结合的方法，研究钢管柱、贝雷梁及盘扣支架组合体系的关键力学行为。结果表明：在施工全过程，组合支架体系主要构件的受力监测结果普遍比有限元计算结果小5%~15%，基于有限元模拟设计的组合支架体系整体具有较高的安全储备；贝雷梁跨中上弦杆应力监测结果与有限元结果的差异明显大于跨中下弦杆，表明有限元模型内部约束条件与实际工作条件存在差别；钢管柱间剪力斜撑的应力监测结果大于有限元模拟结果，在设计阶段应引起注意。

关键词：组合支架体系；全过程监测；有限元分析；工作性能

Performance analysis of a large-span cast-in-place concrete beam composite support system based on full-process monitoring

TANG Zichao¹, ZHANG Jie², HU Liansheng¹, KONG Xiangmin¹, CUI Fengkun^2*

1.China Construction Eighth Engineering Division Second Construction Co., Ltd., Jinan 250022, China;

2.School of Civil Engineering, Shandong Jiaotong University, Jinan 250357, China

Abstract: To analyze the actual working performance of the large-span cast-in-place concrete beam combined supporting system, to prevent support overturning accidents during construction, and to optimize structural redundancy design, a monitoring system is established based on the Jinan tram project′s three-span continuous beam bridge by deploying high-precision sensors. A method combining real-time monitoring throughout the construction process with finite element simulation is used to study the key mechanical behaviors of the combination system composed of steel pipe columns, Bailey beams, and buckle supports. The results indicate that during the entire construction process, the stress monitoring results of the main components of the combined support system are generally 5% to 15% lower than the finite element calculation results, suggesting that the overall design of the combined support system based on finite element simulation possesses a higher safety reserve; the stress monitoring results of the upper chord member of the Bailey beam at mid-span showed a significantly greater discrepancy compared to the finite element results than the lower chord member at mid-span, indicating that there is a deviation between the internal constraints of the finite element model and the actual working conditions; the stress monitoring results of the diagonal braces between the steel pipe columns are greater than the finite element simulation results, which should be noted during the design phase.

Keywords: composite support system; full-process monitoring; finite element analysis; working performance