BIM-Based Prediction Method for Construction Errors in Steel Tubular Trusses

BIM Error Prediction Principle
Establish a digital twin of the steel tubular truss based on the BIM model, and identify sensitive parameters such as key node displacements and weld gaps through sensitivity analysis. The perturbation method is used to solve the stiffness matrix, simulate the structural deformation trend under construction loads, and predict the critical working conditions where the node offset is ≤L/1000 (L is the span).

Error Dynamic Correction Technology
Combine the digital image method to monitor the centroid coordinates of nodes in real time, compare the BIM predicted values with the measured data, and adjust the assembly height of the next segment through target function optimization. For example, in a certain engineering case, after predicting a 20mm vertical offset, the actual adjustment was 18.89mm, and the error was controlled within 3.23%.

Construction Collaboration Application
The BIM model integrates allowable deviation standards (such as misalignment ≤1/10 plate thickness and ≤3.0mm), guiding the optimization of jig assembly and welding sequence. By pre-setting weld shrinkage parameters, closed-loop error control throughout the entire lifecycle from design and construction to acceptance is achieved.