地脉动方法在砌体文物结构检测中的应用

Application of Micro-tremor Method In Historical Brickwork Building Test

砌体文物结构经过成百上千年风化和破坏,易出现强度降低、结构损坏,需进行相应的损伤现状检测,并采取保护措施。目前已有的目视、回弹、沉降监测等方法关注的是表观、局部现状,缺乏整体的判断。文中提出了利用地脉动方法中,卓越频率与监测点结构刚度具有良好对应关系的特点,将其应用到砌体文物检测中。文中详细介绍了该方法的原理,并以上海项宅检测结果为例,介绍了检测流程、布点方案,并分析得到了结构的刚度分布现状和残余刚度分布现状,经验证,分析结果与结构的损伤情况具有很好地对应性。

After hundreds of years＂ weathering and damage, the strength of the historical brickwork building reduces and its structure disrupts. These historical buildings are needed to be test before reparation. At present, the methods such as visual -test, rebound and settlement monitoring are used in structure test. These methods focus on external or partial part, but lacks integral estimation. In this article, the micro - tremor method is proposed to test historical buildings as the predominant frequency is relative to structural stiffness. It introduced the principal and further on, it gave the testing procedure, testing plan and at last, it gave the stiffness distribution map and residual stiffness distribution map. The analysis result proved that the index corresponded to structural damage index well.