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在我国改革开放早期的20世纪80年代,建造了大量的砖砌烟囱,这些砖砌烟囱如今已经服役了30多年,性能退化严重,加上当时的建造水平相对较低,还能否确保后续在使用年限中的正常安全使用,引起了人们的关注。通过对某工业厂区已经服役30年的某砖砌烟囱的实际尺寸、倾斜度、裂缝、砖砌体强度、砂浆强度、以及变形情况等相关项目的现场检测,发现服役30年的砖砌烟囱出现老化损坏严重现象,其中裂缝为其主要病害。基于实测数据对服役30年的烟囱进行承载力验算,并采用有限元软件ANSYS进行数值分析,结合两者结果可以得出该烟囱底部承载力明显不足和上部安全富余不多的结论,并从理论角度阐述了病害产生的主要原因。通过对此烟囱可靠性影响因素分析,对烟囱进行可靠度的综合评定。并结合相关理论,针对该烟囱已存在的安全性问题,提出了加固方案,并对该烟囱加固前后的受力性能进行利用数值模拟分析,结果表明,采用外粘扁钢加固方法的加固效果很好,施工方便、价格低廉、不影响正常使用,该烟囱加固后正常使用两年,目前各项性能表现良好。
In the early 1980s in China’s reform and opening up, a large number of brick chimneys were constructed. These brick chimneys have been in service for more than 30 years now and their performance has been seriously degraded. Coupled with the relatively low level of construction at that time, Life in the normal safe use, aroused people’s attention. Through the on-site inspection of relevant projects such as the actual size, inclination, crack, brick strength, mortar strength and deformation of a brick chimney which has been in service for 30 years in an industrial factory, it is found that the brick chimney which has been in service for 30 years appears Aging damage serious phenomenon, in which cracks as its main disease. Based on the measured data, the bearing capacity of chimneys in service for 30 years was checked, and numerical analysis was carried out by ANSYS software. Combined with the results of both, the conclusion was obtained that the bearing capacity of the chimney was obviously insufficient and the upper part of the safety margin was not enough. Point out the main reason for the disease. Through the analysis of the factors influencing the reliability of the chimney, the reliability of the chimney is evaluated comprehensively. According to the relevant theory, aiming at the existing safety problems of the chimney, a reinforcement scheme is proposed, and the numerical simulation analysis of the mechanical performance of the chimney before and after reinforcement is carried out. The results show that the reinforcement effect of the outer stick flat steel reinforcement method is very good Good, convenient construction, low prices, does not affect the normal use of the chimney reinforcement normal use for two years, the performance of the current good.