摘要
多自由度结构拟静力实验中需对各自由度按照特定的力比例模式进行加载,因此力控制加载自然成为多自由度结构拟静力实验的选择。然而,结构进入倒塌阶段后承载力急剧下降,采用力控制加载的拟静力加载实验难以实施。为有效解决上述问题,本文提出了一种适用于多自由度结构拟静力实验的力和位移混合控制方法。采用此混合控制实验方法既能够保证结构各自由度的受力符合特定的力比例关系,又可以保证在结构进入倒塌阶段后实施稳定的加载控制。基于MTS公司的Flex-TestⅡm平台采用Visual Basic语言开发了多自由度力和位移混合控制拟静力加载实验控制软件TMPTG,并进行了具体实验验证了混合控制算法的有效性。
In quasi-static test for structures with multiple degrees of freedom system, the forces exerted on the structures commonly follow a prescribed force profile, e.g. triangular pattern; therefore, force control becomes the natural choice. However, force control are not applicable any more when the tested structure sustain significant strength degradation during the collapse stage. To this end, a force-displacement mixed control algorithm was devised to achieve the stable control of quasi-static loading using a prescribed force profile. Based on the Flex-Test IIm platform of MTS cooperation, a test program called TMPTG using the mixed control algorithm was developed, physical tests were conducted, and the effectiveness of the algorithm was verified.
出处
《结构工程师》
2011年第B01期37-41,共5页
Structural Engineers
