基于多层框架的子结构远程协同试验方法研究

Remote collaborative test method of multistory frame as substructure

将互联网技术应用到子结构混合试验方法中,便形成了基于网络的远程协同试验方法。建立了一套基于OpenFresco试验平台的远程协同试验系统,以一个局部单层的三层多跨偏心支撑组合钢框架结构为原型,取左边跨带有K形偏心支撑的三层钢框架作为试验子结构1,取右边跨带有Y形偏心支撑的单层钢框架作为试验子结构2,进行了缩尺比例为1/2结构模型的局域网协同试验和互联网远程协同试验。根据试验结果,分析了试验子结构的位移加载精度,作动器加载时差,并将混合模型的命令位移与全结构的纯数值模型模拟结果进行了比较。结果表明:在局域网协同试验中,绝大多数工况下的反馈位移峰值与命令位移峰值接近,个别超过了20%,作动器平均每步的加载时差在0.349 s左右,这个时差主要由有限元分析、作动器逼近加载和稳定产生,在7度设防地震作用下,混合模型分析结果与全结构数值模拟结果基本吻合;在互联网远程协同试验中,随着地震波加速度峰值的增大,位移峰值误差有明显的减小趋势并逐渐趋于平稳,作动器平均每步的加载时差比局域网大0.035 s,这个差值主要由网络通讯产生,在8度罕遇地震作用下,混合模型分析结果与全结构模拟结果仍然比较接近。综上,基于OpenFresco建立的远程协同试验系统,具有良好的稳定性和精度,能够有效地对多层框架子结构混合模型进行抗震性能试验。

A remote collaborative test method based on network is formed through the application of internet technology to the substructure hybrid test method.A remote collaborative test system based on the platform of OpenFresco was established.A three-story and multi-span eccentrically braced steel frame structure with a local single story was taken as the prototype,and the three story steel frame with a K-eccentrically bracing on the left was taken as the experimental substructure 1,and the single story steel frame with a Y-eccentrically bracing was taken as the experimental substructure 2.The collaborative test based on Local Area Network(LAN)and the remote collaborative test based on Internet were carried out with a scale of 1/2 collaborative model.According to the test results,the displacement loading precision of the experimental substructure and the loading time difference of the actuator are analyzed,and the command displacement of the collaborative model is compared with the simulated results of the completed numerical model.The results shows that,in the LAN collaborative test,the peak value of the feedback displacement is close to the peak value of the command displacement in most of the loading cases,and the individual is more than 20%.The average loading time difference of the actuator is about 0.349 s,which is mainly caused by the finite element analysis,the actuator approximation and stability.The results of the collaborative model are basically consistent with the numerical simulation results of the complete structure during the seismic fortification level of 7 degree intensity.In the Internet remote collaborative test,with the increase of the peak of seismic wave acceleration,the displacement peak error has a significant decreasing trend and tends to be stable gradually.The average loading time difference of the actuator in the Internet is 0.035 s more than the average loading time difference in the LAN,and the difference of 0.035 s is mainly generated by the network communication.The results of the collaborative model are still close to the numerical simulation results of the complete structure during the rare earthquake level of 8 degree intensity.In conclusion,the remote collaborative test system based on OpenFresco has good stability and precision,and can be used to test the seismic performance of the multistory frame as experimental substructure.