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利用远程协同试验平台NetSLab,对一个多跨的桥梁结构进行了抗震试验研究。该平台是基于客户机/服务器概念开发的,提出了供结构拟动力远程试验用的数据模型和应用协议。它能够在远程结构实验室或计算机之间通过互联网传送控制和反馈数据。桥梁系统由3个柱子组成,分别在湖南大学、哈尔滨工业大学和清华大学之间模拟。湖南大学站点试验模型为GFRP约束弯曲型钢筋混凝土桥墩柱,哈尔滨工业大学站点试验模型为CFRP约束剪切型钢筋混凝土桥墩柱,清华大学站点则进行数值模拟。对该桥梁进行了3个水准地震作用下的远程协同拟动力试验,地震动加速度选用E l Centro波。试验结果表明,GFRP加固柱具有良好的延性及抗震性能,CFRP加固可阻止柱子的脆性剪切破坏,有效地提高其滞回性能及能量耗散能力,从而可大大地提高整个桥梁系统的抗震能力。
Using the remote collaborative testing platform NetSLab, a multi-span bridge structure is tested for its anti-seismic performance. The platform was developed based on the client / server concept and proposed a data model and application protocol for structural quasi-dynamic remote testing. It transmits control and feedback data over the Internet between remote structural labs or computers. The bridge system consists of three columns, which are simulated respectively between Hunan University, Harbin Institute of Technology and Tsinghua University. The site test model of Hunan University is GFRP confined flexural reinforced concrete piers, the test model of Harbin Institute of Technology is CFRP constrained shear type reinforced concrete piers, and the site of Tsinghua University is numerically simulated. The long-range cooperative quasi-dynamic test of the bridge under the action of three level earthquakes was carried out. The E l Centro wave was selected for the acceleration of earthquakes. The experimental results show that the GFRP reinforced columns have good ductility and seismic performance. The CFRP reinforcement can prevent the brittle shear failure of columns and effectively improve the hysteretic performance and energy dissipation capacity, which can greatly improve the seismic capacity of the whole bridge system .