钢框架-支撑结构施工变形分析及预测方法研究
刘哲 , 梁鹏 , 徐万林 , 苗子臻 , 周学军 , 孙延振
建筑钢结构进展 ›› 2026, Vol. 28 ›› Issue (4) : 47 -55.
钢框架-支撑结构施工变形分析及预测方法研究
Research on the Construction Deformation Analysis and Prediction Method of Braced Steel Frames
本文考虑焊接顺序、安装误差及加载方案等因素对钢框架-支撑结构施工变形的影响,采用有限元方法建立此类结构在不同施工工艺下的施工变形数据库;进而选取焊接顺序、冷却温度、柱身垂偏和加载方案4种影响因素,建立基于PSO-BP神经网络的施工变形预测模型,并结合实际工程数据验证所建模型的准确性。结果表明:钢框架-支撑结构施工过程中的竖向变形主要由焊接顺序和加载方案控制,由二者引起的结构最大变形分别占结构整体竖向变形值的61%和37%;横向变形主要由安装误差控制,由此引起的结构最大变形占总横向变形的94%;与实际工程数据对比可知,所建立的PSO-BP神经网络预测误差小于5%,能够较为精准地预测钢框架-支撑结构体系的施工变形。本研究成果可为工程施工阶段的早期决策提供技术参考。
In this paper, the influences of welding deformation, installation error, and loading schemes on the construction deformation of braced steel frames are taken into account. A construction deformation database for such structures under different processes is established by employing the finite element method. Furthermore, four influential factors, namely welding sequence, cooling temperature, vertical deviation of columns, and loading schemes, are selected to establish a construction deformation prediction model based on the PSO-BP neural network. The accuracy of the established model is verified by using actual engineering data. The results indicate that the vertical deformation during the construction of braced steel frames is mainly controlled by welding sequence and loading schemes, accounting for 61% and 37% respectively. The lateral deformation is mainly controlled by the vertical deviation error of columns, accounting for 94% of the total lateral deformation. Compared with the actual engineering data, the established PSO-BP neural network model yields a prediction error of less than 5%, indicating that it can accurately predict the construction deformation of the braced steel frame system. This study can offer a reference for early decision-making in construction.
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