北京明长城原青砖的超声波测强
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摘要
北京明长城的保护修缮工程需要遵循《长城保护条例》中"不可改变原状"原则,青砖作为北京明长城的主要砌筑材料,对其进行测试并获取其强度性能尤为重要,对长城结构安全、旧砖是否被替换及新砖强度的选择有重要的参考意义。选取北京明长城6个区县的旧青砖砖样,利用超声波检测仪对砖样进行声时测定,计算超声波波速,再结合青砖实际抗压强度,建立波速与抗压强度之间的曲线关系,即从超声波无损检测结果可推算出北京明长城原青砖的抗压强度。
In view of the protection and renovation of the Great Wall in Beijing,the principle of"unchangeable status"in the Regulations on the Protection of the Great Wall should be followed.As the main building material of the Great Wall in Beijing,the understanding of strength performance of the grey brick by testing is particularly important.It has important reference significance for the structural safety of the Great Wall,no matter whether old bricks are to be replaced or not,or the selection of strength for new bricks.The old grey brick samples of Ming Dynasty Great Wall from six counties in Beijing are selected.The acoustic time of the brick samples is measured by ultrasonic detector,and the ultrasonic wave velocity is calculated.According to the actual compressive strength of the grey bricks obtained from the test,the relationship curve between the wave velocity and compressive strength is established.That is to say,the compressive strength of the grey bricks of original Ming Dynasty Great Wall in Beijing is deduced from the ultrasonic nondestructive testing technology.
In view of the protection and renovation of the Great Wall in Beijing,the principle of"unchangeable status"in the Regulations on the Protection of the Great Wall should be followed.As the main building material of the Great Wall in Beijing,the understanding of strength performance of the grey brick by testing is particularly important.It has important reference significance for the structural safety of the Great Wall,no matter whether old bricks are to be replaced or not,or the selection of strength for new bricks.The old grey brick samples of Ming Dynasty Great Wall from six counties in Beijing are selected.The acoustic time of the brick samples is measured by ultrasonic detector,and the ultrasonic wave velocity is calculated.According to the actual compressive strength of the grey bricks obtained from the test,the relationship curve between the wave velocity and compressive strength is established.That is to say,the compressive strength of the grey bricks of original Ming Dynasty Great Wall in Beijing is deduced from the ultrasonic nondestructive testing technology.
引文
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[11]李密芳.烧结砖瓦产品的力学性能及其他性能[J].砖瓦,2009(9):131-140.
[2]丁伟,王占雷,刘波,等.现代手工青砖回弹测强曲线研究[J].工程质量,2013,31(8):18-21.
[3]张莉.刍议烧结普通砖强度的检测[J].建筑工程技术与设计,2015(30):849.
[4]王建东.超声技术在混凝土测强中的应用[J].武汉化工学院学报,2004,26(4):42-43.
[5]张志国,彭华,马寅生,等.超声波无损探伤检测在现代出土石质文物保护中的应用[J].地质力学学报,2005,11(3):278-285.
[6] MORALES CONDE M J,RPDRIGUEZ LI~NAN C,RUBIO DE HITA P.Use of ultrasound as a nondestructive evaluation technique for sustainable interventions on wooden structures[J].Building and Environment,2014,82:247-257.
[7]戴仕炳,刘斐,周月娥,等.古建筑烧结粘土砖性能检测的超声波方法研究[J].文物保护与考古科学,2016,28(2):16-23.
[8]孙磊,汤永净.古砖砌体冻融循环下轴心受压试验及超声波测试[J].结构工程师,2018,34(4):128-134.
[9] KOJIMA T, HAYA H, MINEGISHI K,et al.Ultrasonic velocity measurement for analysis of brick structure[C]∥2008IEEE Ultrasonics Symposium.New York:IEEE,2008:398-401.
[10] CECS 21:2000超声法检测混凝土缺陷技术规程[S].
[11]李密芳.烧结砖瓦产品的力学性能及其他性能[J].砖瓦,2009(9):131-140.