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工程力学  2014 

自适应张弦梁结构的内力控制理论研究

DOI: doi:10.6052/j.issn.1000-4750.2012.12.1000, PP. 159-165

Keywords: 自适应张弦梁,内力控制,风吸作用,移动荷载,时滞,可控区域

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Abstract:

自适应张弦梁结构是可根据外部荷载变化调节结构中的预应力,实现对结构工作状态控制的智能结构.该文首先分析自适应张弦梁结构的工作机理;然后建立结构的内力状态方程;接着对在风吸作用下下弦拉索退出工作的内力控制问题进行分析,并建立相应的控制模型;再对在移动荷载作用下上弦梁受力不均匀的内力控制问题进行分析,根据移动荷载的大小和移动速度,将荷载空间划分为无时滞可控区域和有时滞控制区域,并以结构最合理内力分布状态为目标分别建立各可控区域内力控制模型;最后通过数值算例验证该类结构的工作性能.数值结果表明,相对于普通张弦梁结构,自适应张弦梁结构通过自适应控制能够降低结构的内力峰值和初始预应力水平要求,并提高结构的承载力.

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