【摘要】 基于8根压电智能混凝土梁的主动控制试验,较为系统地研究压电智能混凝土梁在静力荷载和压电驱动器产生的驱动力作用下的变形恢复能力、应变恢复特性和裂缝闭合特征,重点分析配筋率、跨高比和驱动器埋设位置等因素的影响。试验结果表明,通过对压电智能混凝土梁施加驱动力,可以有效地实现智能混凝土梁的应变、变形和裂缝的主动控制,其中应变恢复率达到30%左右,变形恢复百分比在21%-42%之间,裂缝宽度闭合程度大致在12%-15%之间。另外,基于非线性有限元原理,编制压电智能混凝土梁的分析程序,实现压电智能混凝土梁主动控制的全过程分析。更多还原

【Abstract】 Based on the active-control experiments of eight piezoelectric smart beams,the strain and displacement restoring capacity and the characteristics of crack closing of smart beams,under static loads and actuating forces induced by piezoelectric actuators,are systematically studied.The influences of longitudinal reinforcement ratio,span-height ratio and locations of actuators are emphatically analyzed.Experimental results show that the control of piezoelectric smart beams is achieved well when the actuating force was applied to smart beams.Ratio of strain restoration is about 30%,ratio of displacement restoration about 21%~ 42% and ratio of crack closure gets to approximately 12%~15%.In addition,nonlinear FEM codes are developed for analysis of active control of piezoelectric smart concrete beams.更多还原