Performance, strategy, and evaluation of truss string structure based on active control

Active control is an intelligent regulation technology that can improve structural safety and enhance structural adaptability without changing the quality of the building structure. In order to make the truss string structure (TSS) adaptable to temporary loads during service, active control was introduced into TSS. In this study, an active control system including an actuating, a sensing, and a control device was established. The control effect of the active control system on the TSS under various temporary loads was studied experimentally, a control strategy for single-target monitoring of the TSS based on displacement state and stress state was proposed, and the evaluation method for active control of TSS was established by the control efficiency. The results show that the active control system can realize active control of the TSS with deformation as the target. Under symmetrical loads, monitoring any position can reduce the deflection of the TSS under the control strategy of displacement state and stress state, and the control efficiency is the same and can reach about 90 %. Under asymmetrical loads, the positions to be monitored under the control strategy of displacement state and stress state are different, and the control efficiency is higher under the control strategy of displacement state. However, due to the limitations of single-target monitoring, the control efficiency of TSS under asymmetrical loads is significantly lower than that under symmetrical load.