Construction process monitoring of a large-span steel truss roof based on response-increment comparison strategy

Large-span spatial structures, with good appearance and plasticity are mostly used nowadays in urban landmarks. During the construction process, the loads are accumulated along with the construction conditions and the responses vary from the construction paths. Hence, a safety evaluation or monitoring of the construction process appears significant. During monitoring, the installation moment of strain gauges is not always the ideally non-loading status, the absolute or real strains in the structural components are difficult to acquire. Furthermore, the displacement monitoring for all key points reduces the construction efficiency. Herein, a response-increment real-time comparison strategy of stresses and unloading point displacements within numerical analysis is announced to avoid the above shortcomings. Based on a real large-span truss structure located in China, four construction schemes are proposed and investigated by simulation method. With the proposed construction scheme and monitoring strategy, a stress and displacement monitoring for the large-span truss structure was conducted. Through the comparison between the monitoring and simulation data, the proposed strategy is verified feasible for the construction monitoring, the efficiency is accelerated and the safety is guaranteed.