差异工况下满堂支架关键测点及预警系统

刘圣洁¹，赵之仲^1*，陈旭²，隋明言¹，赵瑜隆¹

1.山东交通学院交通土建工程学院，山东济南250357；2.山东高速建设管理集团有限公司，山东济南250098

摘要：为有效避免施工过程中的支架坍塌事故，解决预警不及时的问题，建立承插型满堂盘扣支架计算模型，以角度变形为表征指标，分析不同施工工况下支架结构的受力变形，模拟分析支架破坏过程，确定关键测点及预警标准，建立杆件关键测点与角度阈值的对应关系；采用现场桥梁原位试验法，布设9轴姿态角度传感器采集数据，以各测点的角度阈值为监测指标，与现场数据进行对比分析。结果表明：支架的最大变形与最大应力均处在跨中部位；正常使用极限状态下，x方向跨中横向两端测点的荷载响应较好，最大的角度阈值为0.022 2°，y方向跨中边缘测点可作为y方向的关键测点，最小的角度阈值为0.006 5°；承载能力极限状态下，x方向的角度阈值比正常使用极限状态减小约50%，y、z方向的角度阈值比正常使用极限状态分别增大6%、24%；模拟结果与实际监测数据吻合，角度阈值作为监测指标有一定的实用性。

关键词：支架监控；变形；有限元；角度传感器；角度阈值;差异工况

Key measurement points and early warning system for scaffolding under different working conditions

LIU Shengjie¹, ZHAO Zhizhong^1*, CHEN Xu², SUI Mingyan¹,ZHAO Yulong¹

1.School of Civil Transportation Engineering, Shandong Jiaotong University, Jinan 250357, China；

2.Shandong Hi-Speed Construction Management Group Co., Ltd., Jinan 250098, China

Abstract:In order to effectively prevent scaffold collapse accidents during construction and address the problem of untimely warnings, a plug-in type scaffold calculation model is established, which uses angular deformation as the representation index. The stress and deformation of the scaffold structure under different construction conditions are analyzed, and the failure process of the scaffold is simulated, to determine key measurement points and warning criteria, and to establish the corresponding relationship between critical measurement points and angular thresholds. The on-site bridge in-situ test method is used, and 9-axis attitude angle sensors are deployed to collect data. The angular threshold of each measurement point is used as a monitoring indicator and compared with the on-site data. The results show that the maximum deformation and maximum stress of the scaffold are located at the mid-span position. Under normal serviceability limit state, the load response of the transverse measurement points at the ends of the mid-span in the x-direction is good, with a maximum angular threshold of 0.022 2°. The measurement point at the edge of the mid-span in the y-direction can be considered as a key measurement point, with a minimum angular threshold of 0.006 5°. Under the ultimate limit state, the angular threshold in the x-direction decreases by approximately 50% compared to the normal serviceability limit state, while the angular thresholds in the y-direction and z-direction increase by 6% and 24% respectively. The simulation results are consistent with the actual monitoring data, demonstrating the practicality of using angular thresholds as monitoring indicators.

Keywords:bracket monitoring; deformation law; angle sensor; inite element; angle threshold; different working condition