既有建筑木结构无损检测实例分析

Case Analysis of Non-destructive Detection for Timber Structure of Existing Buildings

以某既有建筑木结构为例,采用多种无损检测方法对木构件、榫卯节点缺陷进行检测,并确定木材强度等级,基于检测结果对检测方法可行性进行分析。研究结果表明,钻入阻抗法能合理反映既有建筑木结构缺陷位置和几何尺寸;轻微炭化部位阻力曲线峰值并未显著降低,而严重炭化部位阻力曲线峰值明显低于完好部位;内窥镜法可对榫卯节点内部损伤进行合理表征;超声波-阻抗仪综合法在木材强度等级确定中具有可行性。

This paper took an existing building timber structure as an example,and used a variety of non-destructive detection methods to detect timber member,mortise-and-tenon joints defects and timber strengths. The feasibility of the detection methods was analyzed based on the detection results. The results show that the drilling resistance method can reasonably reflect the deflect location and geometry of timber structure of existing buildings. The peak of the resistance curve in the slightly carbonized area did not decreased significantly. The peak of the resistance curve in the severely carbonized area was significantly lower than the intact area. Endoscopy can reasonably characterize the internal damage of the mortise-andtenon joints. The ultrasonic-drilling resistance synthesis method is feasible in determining the strength grade of wood.