Construction process monitoring of space trusses

Structure deflection and bar strain tests were carried out on two new bolt-ball-grid structure at different construction stages. After analyzing deflection test results, it is found that non-load effects directly caused obvious deflection, reflecting the effects of components of geometric precision. Standard load value directly caused the testing and calculation of deflection difference and this obviously indicated that the connection between elements are important status. The construction process deflection control should be decomposed and treated differently. Strain test and analysis show that the bar average stress level of calculated and measured are fairly, but some change from pull to push or from push to pull, and the moment always exists in all bars. Numerical calculation shows that the structural deformation and forces are changed with the construction process, some bars may even yield. All these imply that construction calculation is very important and the average moment stress ought to be considered in truss structure design.