ANALYSIS ON NON-UNIFORM TEMPERATURE FIELD OF LARGE-SPAN STEEL TRUSS STRUCTURE WITH INCLINED LEG

Large-span spatial structures are exposed to solar radiation for a long-time during construction, resulting in obvious temperature effects in the structures. Because of the unique space grid characteristics of the structure and the real-time change of the solar radiation angle, there is an obvious shielding effect between the members. Thusly, the temperature field of the structure not only changes with time, but also has uneven characteristics. Upon analyzing algorithm of structural temperature field with geographic meteorological information and members shielding, the transient temperature field of the structure is simulated and analyzed by taking the large-span steel truss structure with inclined leg as the research background. Combined with the long-term monitoring of temperature and micro strain, the uneven temperature field of the structure and the stress in the construction stage are discussed. The results show that: the shielding effect makes the maximum transient temperature difference between bars up to 21%, and the time variability and non-uniformity are very significant; the stress of the structure in the construction stage mainly comes from the temperature effect, and the temperature effect of the structure in the construction stage cannot be ignored.