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检测及试验方法研究
卢 果，徐 骁，张 琪，杨 逍，张亚梅，熊远亮
摘 要：采用可埋入的超声压电传感器与商用超声检测仪相连，测试了不同强度等级装配式建筑梁板柱节点处的混凝土在不同龄期的强度与波速，建立了埋入式传感器专用测强曲线，并与传统方法进行了对比，验证了传感器的测试精确度。结果表明，埋入式自制传感器与传统传感器测试数据吻合度高，相同强度下两者测强曲线拟合相关系数接近1，平均相对误差满足规范中小于12%的要求。埋入式自制传感器可与现有超声测试技术兼容，有效地对缺少操作面及复杂的构件进行强度检测。Abstract:Self-madeembeddedpiezoelectricceramictransducersforultrasonictestingwasemployedandconnectedwithcommercialultrasonictestertoassessthestrengthoftheconcreteinbeam-column-slabconnectionofprefabricatedbuildings,andthestrengthofconcreteandthevelocitythatultrasoundtravelsthroughtheconcreteweremeasuredatdifferentages,andthecurvefromembeddedtransducersforstrengthmeasurementwasestablished.Thecurvefromtraditionaltransducerswasalsoestablishedtocomparetheirsimilaritytoverifytheaccuracyofthenewmethod.Theresultsshowthattheembeddedself-madetransducerandthetraditionaltransducerhaveahighcoincidencedegree,andthefittingcoefficientisveryhigh(upto1)andtherelativeerroriswithin12%.Theembeddedpiezoelectrictransducersarecompatiblewiththeexistentultrasonictestingtechnology,theycanmeasurethestrengthofmemberswithlessoperativesurfacesandcomplicatedshapes,whichisimpossibleusingtraditionaltechnology.
卢果,徐骁,张琪,等.埋入式超声传感器混凝土测强曲线研究[J].混凝土与水泥制品,2020(4):86-90.
LU G,XU X,ZHANG Q,et al.Research on the Strength Measurement Curve of Concrete from Embedded Piezoelectric Transducers[J].China Concrete and Cement Products,2020(4):86-90.
王晓航1，雅 菁1，尚静媛2，徐 杰2，陈 倩2，孙沫然2，赵 杰1
摘 要：基于传热学理论，利用红外热成像检测技术对钢板组合剪力墙界面脱空问题进行了研究。结果表明，采用主动式热激励和被动式热激励加热两种方式可以有效识别出钢板组合剪力墙界面脱空的缺陷位置和尺寸，当钢板壁厚为1mm时，可识别1cm2以上的缺陷；钢板壁厚为3mm和5mm时，可识别4cm2以上的缺陷。合理控制热激励功率和时间可以有效减小缺陷尺寸识别的误差率。结合工程实际，红外热成像法可以识别出钢板组合剪力墙界面脱空缺陷及未浇筑区域，便于在浇筑混凝土时进行实时跟踪检测。Abstract:Basedonthetheoryofheattransfer,theinterfacevoidproblemofsteelplatecompositeshearwallwasstudiedbyusinginfraredthermalimagingtechnology.Theresultsshowthatthepositionandsizeofinterfacevoiddefectinsteelplatecompositeshearwallcanbeeffectivelyidentifiedbyusingactivethermalexcitationandpassivethermalexcitationheating.Whenthethicknessofsteelplateis1mm,defectsabove1cm2canbeidentified,whenthethicknessofsteelplateis3mmand5mm,defectsabove4cm2canbeidentified.Theerrorrateofdefectsizeidentificationcanbeeffectivelyreducedbycontrollingthepowerandtimeofthermalexcitation.Combinedwiththeengineeringpractice,theinterfacevoiddefectandnon-pouringareaofsteelplatecompositeshearwallcanbeidentifiedbyinfraredthermographymethod,whichisconvenientforreal-timetrackingdetectioninpouringconcrete.
王晓航,雅菁,尚静媛,等.钢板组合剪力墙界面脱空的红外热成像法检测[J].混凝土与水泥制品,2020(4):91-95.
WANG X H,YA J,SHANG J Y,et al.Infrared Thermography Detection of the Interface Void of Steel Plate Composite Shear Wall[J].China Concrete and Cement Products,2020(4):91-95.