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针对地震作用下混凝土结构塑性铰区域动态应力的监测需求,提出利用压电智能骨料进行混凝土内部损伤过程动态应力监测的方法,采用试验手段对该方法进行验证:对1根在塑性铰区域布置压电智能骨料及应变片的混凝土柱施加水平方向动态往复荷载,得到混凝土应力及钢筋的应变时程并进行对比分析。结果表明:压电智能骨料可以监测混凝土开裂的过程,测得混凝土抗拉强度与理论值基本一致;压电智能骨料可以监测动态加载全过程的钢筋混凝土内部压应力重分布规律,并与钢筋应变片的应变变化规律相互印证,验证了该监测方法的可行性。
Aiming at the requirement of dynamic stress monitoring of plastic hinge in concrete structure under seismic action, a method of using piezoelectric smart aggregate for dynamic stress monitoring of internal damage process of concrete is proposed. The method is verified by experimental means: Piezoelectric smart aggregates and strain gauges were applied with dynamic reciprocating loads in the horizontal direction to get the stress history of concrete and the strain history of the reinforcing bars and to make comparative analysis. The results show that the piezoelectric smart aggregate can monitor the cracking process of concrete, and the measured tensile strength of concrete is basically consistent with the theoretical value. The piezoelectric smart aggregate can monitor the internal pressure stress redistribution in the whole process of dynamic loading, The strain variation of steel strain gauges confirms each other, which verifies the feasibility of the monitoring method.