地震过程剪应力监测压电智能骨料  

Seismic shear stress measurement using PZT based smart aggregate

作　　者：侯爽[1] 张海滨[1] 欧进萍[1] 

机构地区：[1]大连理工大学,辽宁大连116024

出　　处：《土木工程学报》2013年第S1期195-201,共7页China Civil Engineering Journal

基　　金：国家自然科学基金(50908031;51161120359)

摘　　要：提出用于监测地震过程中混凝土结构剪应力的压电智能骨料(Smart Aggregate,简称SA),该压电智能骨料采用d15型PZT作为敏感元件。为研究该压电智能骨料对剪应力的响应,对压电智能骨料的两侧面反对称施加剪力,并建立该压电智能骨料的有限元模型,研究剪应力在其中的传递规律,从理论上得出该压电智能骨料的灵敏度系数;设计施加剪应力的模具,通过电液伺服试验机对该压电智能骨料施加动态荷载,荷载频率为地震作用下通常出现的结构响应频率,荷载幅值大于普通混凝土结构的抗剪强度。试验表明,在混凝土抗剪强度范围内,该压电智能骨料对剪应力的灵敏度保持恒定,试验结果与理论结果吻合较好,表明文中建立的有限元模型是可靠的。综上,该文提出的压电智能骨料可以用于地震损伤全过程剪应力监测。A kind of smart aggregate for seismic shear stress monitoring in concrete structures is proposed. The SA uses d15-mode PZT as the sensing element. A calibration test is designed in which cyclic shear stress with a dominant frequency of the earthquake response spectrum is applied on the two opposite sides of the proposed SA using a specially designed loading mold. The maximum applied stress is larger than the shear strength of ordinary concrete to allow for measurement during failure. The Finite Element( FE) model is established for researching the distribution of stress in the SA,and we calculate the sensitivity of the SA in theory. The calibrated sensitivity value and the calculated valve are approximately the same,indicating that the established FE model is reliable,the sensitivity of SA is also very stable in test result. In conclusion,the proposed SA can be used in monitoring the overall shear stress development process in concrete during a seismic event.

关 键 词：压电智能骨料 PZT 剪应力 混凝土 

分 类 号：TU528.041[建筑科学—建筑技术科学]