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

1.各种无损检测方法的研究(1)温莎销贯入法：温莎销贯入阻力与砖的抗压强度之间的关系式，(2)电磁雷达法：利用作者提出的基于有限差分法的分析方法，提出了改善电磁雷达设备内部图像的方法。(3)红外热像法：通过考虑颜色参数和阳光的吸收率来消除表面颜色和表面粗糙度对热像图像的影响的方法，以及利用数码相机测量的光照分布来改善人工光获得的热像的方法是…表面颜色评价砂浆力学性能的方法：研究了砂浆表面颜色与含水率、配合比、龄期及砂浆强度、动弹模数等力学性能的关系，阐明了颜色、含水率、动弹模数与砂浆力学性能之间的关系。2.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被应用于历史建筑的劣化诊断，如维柯福特避难所(建于1750年，砖结构，意大利国宝)，飞艇机库(建于1919年，钢筋混凝土结构，意大利国宝)，拉坎吉大桥(建于1920年，大分县石构)，砖烟囱(爱知县)、日本大学大楼(始建于1971年，千叶县钢筋混凝土结构)等，并证实了这些无损检测方法的适用性。较少

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