FEM Simulation and Field Monitoring of Depropping Procedure of a Large-Span Single-Layer Latticed Shell

Abstract

This paper investigates the depropping procedure of a large span single-layer dome-shape latticed shell roof structure through numerical analysis and field measurements. The depropping procedure consists of six steps. For each step, the joint displacements and member internal forces of the roof structure were first predicated using a numerical model. Based on the simulations results, instruments as vibrating wire strain gauge, total station, accelerometer and global positioning system (GPS) were installed on the structure to monitor the actual displacements and variations of structural members' internal forces during the depropping procedure. The GPS data are compared with total station measurements to learn its applicability for monitoring depropping procedure of large roof structure. The comparison between the numerical results and field measurements demonstrates that the suggested simulation method is reasonable in the sense that the variation trend of deflection and internal forces of the structure can be captured. The GPS technology gives more accuracy measurements in horizontal displacement than vertical deformation. A combination of GPS technology and total station can increase the displacement measurement accuracy.