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本文主要介绍一种新型的无线传感的预应力拉索钢结构索力监测技术。该技术基于振弦武传感器和无线传输技术,通过无线组网,传输数据,并实施远程监控。此项技术发展了一种适用于预应力拉索钢结构体系的应力监测系统,并在乐清市体育中心体育场投入使用,并证明了其技术的有效性,可满足未来类似大型钢结构项目的监测需求。 相似文献
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通过试验研究了高温后混凝土抗压强度与超声波速之间的关系,经对试验结果的回归分析,给出了混凝土超声波速与抗压强度之间的计算公式,并应用于工程实践,对火灾后混凝土强度的无损检测有一定指导意义. 相似文献
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The compressive strength and ilexural toughness as well as fracture energy of fiber reinforced highperformance concrete (FRHPC) subjected to different high temperatures were studied. The results showed that after exposure at 300,600 and 900℃, the concrete mixes retained 88.1% , 41.3% and 10.2% of the original compressive strength on average, respectively. Steel fiber and polypropylene (PP) fiber were both effective in minimizing the damage effect of high temperatures on the compressive strength. The HPC reinforced with steel fibers showed higher flexural toughness and fracture energy before and after the high-temperature exposures. In comparison, PP fibers had minor beneficial effects on the flexural toughness and fracture energy. The mechanical properties of HPC reinforced with hybrid fibers (steel fiber + PP fiber) were equivalent to or better than those of HPC reinforced with steel fibers alone. In addition, the failure pattern of FRHPC beams changed from pull-out of steel fibers at lower temperatures (20, 300 and 600℃) to tensile failure of steel fibers at higher temperature (900 ℃). 相似文献
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