RESEARCH AND APPLICATION OF STRUCTURE HEALTH MONITORING SYSTEM IN LONG-SPAN SPATIAL STRUCTURE

摘要

The attenuating capabilities of long-span spatial structures due to environmental erosion,material aging and long-term load effect,fatigue effect and mutation effect will inevitably lead to accumulated structure damage,reduced resistance against natural interference,and even extreme catastrophe. The structure health monitoring (SHM) technology for surveillance,evaluation and assessment of existing or new structures has attracted much attention in the engineering research and now attainted some degree of maturity. Real-time monitoring of structure parameters under construction and operative service period provides direct basis for assessing the structure health condition. A documented monitoring system and a group of specific sensors including Fiber Bragg Grating (FBG) strain sensors,accelerometers,displacement meters and tilt transducers were presented and applied in a new gymnasium,in Dalian Sports Center,a steel based structure with a large multi-chorded dome (cablebased latticed Shell). This paper discusses the principle of monitoring system development,sensor behavior and applied health monitoring results. Based on current development and field practice,it is found that the monitoring system managed to automatically analyze the test data,evaluate the structure health status and advertise warning ahead of loss.