Abstract
Lightweight cable–membrane structures can span large distances and undertake aesthetically pleasing shapes. They are widely used for roofs and modern structural canopies and in the aerospace industry for large on-board antenna reflectors that are to be deployed in space. This paper studies a wind-induced vibration under different cable stress relaxation conditions based on the wind load time-history to obtain the dynamic behavior of such a structure. Particularly, the focus is put upon its wind resistance in the event of stress relaxation. This research can provide an important reference for the design of wind resistance, damage assessment, and emergency maintenance for the spoke-wise cable–membrane structure (SCMS).
Highlights
The lightweight structures of cable membranes are sensitive to the wind
To obtain the dynamic behavior of an spoke-wise cable–membrane structure (SCMS) under wind load, especially its wind resistance in the event of stress relaxation, this paper deals with the wind-induced vibration of a membrane structure in the conditions of the cables stress relaxation that is loaded by the simulated wind load time-history
To analyze the wind-induced vibration with varying relaxations of cable, the stress relaxation was set to 3% of the initial prestress applied in the finite element simulation and used five conditions, which are single URC relaxation (SUR), single LRC relaxation (SLR), two adjacent URCs relaxations (TAUR), two adjacent LRCs relaxation (TALR), and TACR
Summary
The lightweight structures of cable membranes are sensitive to the wind. A small change in the wind load could lead to the large deformation and even destruction of a cable membrane. The study of Hao et al [15] shows that the prestress relaxation occurs in the actual structure during the construction process, and their construction monitoring data show that the stress distribution of the structural cable system is not uniform These factors would affect the mechanical properties of the membrane structure under wind load. To obtain the dynamic behavior of an SCMS under wind load, especially its wind resistance in the event of stress relaxation, this paper deals with the wind-induced vibration of a membrane structure in the conditions of the cables stress relaxation that is loaded by the simulated wind load time-history It should create an additional essential reference for the design of wind resistance, damage assessment, and emergency maintenance for SCMS
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