感应加热破碎型钢混凝土构件试验研究  

EXPERIMENTAL STUDY ON DEMOLISHING STEEL REINFORCED CONCRETE COMPONENTS BY INDUCTION HEATING

作　　者：许崇浩 郑文忠[1,2] 胡明亮 王英[1,2] XU Chong-hao;ZHENG Wen-zhong;HU Ming-liang;WANG Ying(Key Lab of Structures Dynamic Behavior and Control(Harbin Institute of Technology),Ministry of Education,Harbin 150090,China;Key Lab of the Smart Prevention and Mitigation of Civil Engineering Disasters(Harbin Institute of Technology),Ministry of Industry and Information Technology,Harbin 150090,China)

机构地区：[1]结构工程灾变与控制教育部重点实验室(哈尔滨工业大学),哈尔滨150090 [2]土木工程智能防灾减灾工信部重点实验室(哈尔滨工业大学),哈尔滨150090

出　　处：《工程力学》2022年第4期100-112,共13页Engineering Mechanics

基　　金：国家重点研发计划项目(2017YFC0806100)。

摘　　要：感应加热破碎型钢混凝土(SRC)时,型钢直接被电磁感应加热,混凝土依靠型钢热传导被加热,型钢与混凝土之间产生温度差和变形差,为实现型钢与混凝土之间的分离提供可能。开展了6根无混凝土保护层和8根有混凝土保护层型钢混凝土试件的感应加热分离试验,试验结果表明:不同试件内型钢的温升曲线趋势基本相同,即型钢温度在450℃以下时,型钢升温较快,约为30℃/min~50℃/min;当型钢温度在450℃~700℃时,型钢温升变慢,约为20℃/min~30℃/min;当型钢温度达到700℃后,型钢温升平缓。当型钢温度不高于700℃时,随着型钢温度的升高,型钢与混凝土之间温度差及膨胀差基本呈线性增加。型钢与混凝土的膨胀差主要与型钢腹板高度相关,当型钢腹板高度为300 mm,膨胀差不小于1.80 mm时,可方便型钢与其所辖混凝土的分离;当型钢腹板高度为400 mm,膨胀差不小于2.12 mm时,可方便型钢与其所辖混凝土的分离。In the process of induction heating, the steel is heated directly by electromagnetic induction while the concrete is heated by heat conduction. The temperature and deformation differences between the steel and concrete are produced, which provide the possibility for the separation between the steel and the concrete. The induction heating separation tests of six steel reinforced concrete specimens without protective layers and eight steel reinforced concrete specimens with protective layers were carried out. The test results show that the trend of the temperature rise curve of the steel in different specimens is basically the same. When the temperature of the steel is below 450 ℃, the temperature rise of the steel is fast and the rate is approximately 30 ℃/min ~ 50 ℃/min.When the steel temperature is between 450 ℃ ~ 700 ℃, the steel temperature rise slows down and the rate becomes approximately 20 ℃/min ~ 30 ℃/min. When the steel temperature reaches 700 ℃, the steel temperature rises gently. When the steel temperature is no higher than 700 ℃, the temperature and expansion differences between the steel and the concrete increase linearly. The expansion difference between the section steel and concrete is mainly related to the height of the section steel web. When the height of section steel web is 300 mm and the expansion difference is not less than 1.80 mm, it is convenient to separate the section steel from the concrete. When the height of section steel web is 400 mm and the expansion difference is not less than 2.12 mm,it is also convenient to separate the section steel from the concrete.

关 键 词：型钢混凝土结构 温升曲线 试验研究 感应加热 膨胀差 

分 类 号：TU398[建筑科学—结构工程]