Applicability of Non-Destructive Testing Methods to Historical Buildings Focusing on Brick Structure

本文的研究结果总结如下：1。(1)温莎销贯入法：在大量试验的基础上，提出了温莎销的贯入阻力与砖、水泥砂浆、石灰砂浆抗压强度的关系式。欧洲许多历史砖结构都采用了温莎销抗压强度的关系式。(2)电磁雷达方法：利用作者在时域有限差分法的基础上提出的解析方法，对电磁雷达设备获得的内部图像进行改进。(3)红外热像法：提出了通过考虑颜色参数和阳光吸收率来消除表面颜色和表面粗糙度对热像图像影响的方法，以及利用数码相机测量的照度分布来改善人工光获得的热像图像的方法。(4)通过表面颜色估算砂浆力学特性的方法：研究了表面颜色与砂浆含水量、配合比、龄期以及砂浆强度、动态弹性模量等力学特性之间的关系，明确了颜色、含水量、配合比与力学性能之间存在比较相关性。(5)钻孔锚固法估算地表强度：利用自行研制的钻孔锚固仪估算砂浆与陶土表面强度的相关曲线。无损检测方法在历史建筑诊断中的适用性研究上述无损检测方法已应用于维科福特圣堂（1750年建造，砖结构，意大利国宝）、飞艇吊架（1919年建造，钢筋混凝土结构，意大利国宝）、罗坎寺桥（1920年建造，石头结构，大分县）、砖烟囱（爱知县），日本大学建筑物（1971年建造，钢筋混凝土结构，千叶县）等，并证实了这些无损检测方法的适用性。少

The results of this study are summarized as follows :1.Study on Various Non-Destructive Testing Methods(1)Windsor Pin Penetration Method : The equations expressing the relationship between penetration resistance of Windsor pin and compressive strength of brick, cement mortar and slaked lime mortar which was used in many historical brick structures in Europe were proposed based on a wide range of experiments.(2)Electromagnetic Radar Method : The method for improving internal image obtained by electromagnetic radar apparatus was proposed by using the analytical method developed by the authors based on the finite difference time domain method.(3)Infrared Thermography Method : The method for eliminating the effects of surface color and surface roughness on thermographic image by considering color parameters and absorption rate of sunlight, and the method for improving thermographic image obtained by artificial light by using the distribution of illumination measured by digital camera were … More proposed.(4)Method for Estimating Mechanical Characteristics of Mortar by Surface Color : The relationships between surface color and water content, mix proportion, age, mechanical characteristics of mortar such as strength and dynamic modulus of elasticity were investigated, and it was clarified that there is a comparative correlation between color, water content, mix proportion and mechanical properties.(5)Method for Estimating Surface Strength by Anchoring of Drill : Correlation curves for estimating the surface strength of mortar and terracotta by using the drill-anchoring apparatus developed by the authors.2.Study on Applicability of Non-Destructive Testing Methods to Diagnosis of Historical BuildingsNon-destructive testing methods mentioned above were applied to the diagnosis of deterioration of historical buildings such as the Sanctuary of Vicoforte (constructed at 1750, brick structure, national treasure of Italy), a hanger of airship (constructed at 1919, reinforced concrete structure, national treasure of Italy), the Rakanji bridge (constructed at 1920, stone structure, Oita Prefecture), brick chimneys (Aichi Prefecture), a building of Nihon University (constructed at 1971, reinforced concrete structure, Chiba Prefecture) etc., and the applicability of these non-destructive testing methods was confirmed. Less