基于冲击法的混凝土结构空隙检测应用研究

Application Research on Concrete Structure Void Detection Based on Impact Method

钢管混凝土(CFST)是许多土木工程结构必不可少的承重部件。钢管混凝土结构中,混凝土和钢接触面之间的空隙降低了钢管混凝土结构的承载能力。文中基于冲击法提出对钢管混凝土结构地下空隙进行检测,记录非空隙和空隙区域的敲击声音信号,分析声音信号功率谱密度(PSD),并利用支持向量机确定是否存在空隙。试验结果表明,预测精度为94.17%,证明文中方法简单、高效、准确。

Concrete filled steel tube(s CFST)are essential load-bearing components in many civil engineering structures.In steel-concrete structures,the underground void between the concrete and stee lcontact surface reduces the bearing capacity of the steel-conrcete structure.The article proposes the detection of underground voids in steel-concrete structures based on the impact method,records the knocking sound signals in non void and void areas,analyzes the power spectral density(PSD)of sound signals,and uses support vector machines to determine the presence of voids.The experimental results showt hat the prediction accuracy is 94.17%,proving that the propoesd method is simple,efficient,and accurate.