受浸泡砖砌体力学性能及加固修复方法的研究

发布时间：2018-04-29 14:13

本文选题：砖砌体 + 浸泡　；参考：《东南大学》2015年硕士论文

【摘要】：近年来,以砌体结构为主的历史建筑群和村镇房屋频繁遭遇洪水灾害而损毁严重,造成了历史建筑的社会价值、历史价值的流失和村镇人民的经济损失、生命安全威胁。当前对洪水浸泡下砖砌体的力学性能研究主要集中在24小时以内短期浸泡下的抗压、抗剪性能的对比,而实际水灾时砖砌体的浸泡时间有可能达到数日。通过研究长期浸泡下砖砌体的力学性能,提出适用于洪水浸泡后砌体房屋的可靠性鉴定和加固修复方法,是目前亟待开展的研究课题之一本文主要对砂浆、砖、砖砌体进行不同浸泡时间下的抗压强度试验,根据砂浆类型对砖砌体分类,砂浆采用不同配合比的混合砂浆和石灰砂浆,通过试验观察砂浆、砖和砖砌体的受压破坏现象和抗压强度随浸泡时间的变化规律。试验表明：混合砂浆在表面潮湿状态和风干4天后强度随浸泡时间呈现出先下降再回升最后下降并趋于稳定的变化趋势；石灰砂浆在表面潮湿状态下强度为零,风干状态下强度随浸泡时间变化较小且随着风干时间的增加强度逐渐恢复。浸泡后砖强度随浸泡时间变化较稳定,砖砌体的抗压强度随着浸泡时间逐渐降低。基于以上试验研究和既有文献的成果,对受浸泡砖砌体的力学性能进行分析研究。首先,分析受浸泡砂浆强度随浸泡时间的整体变化趋势,采用分段函数进行线性拟合,建立了受浸泡砂浆强度的实用公式。再结合受浸泡砂浆、砖、砖砌体抗压强度试验值,对砖砌体抗压强度公式进行参数修正,在此基础上建立了受浸泡砖砌体的抗压强度实用公式。总结分析既有文献成果,建立了适用于受浸泡砖砌体的抗剪强度模型公式。最后,基于受浸泡砖砌体的力学性能研究,分析水浸泡对砌体房屋的可靠性影响程度,结合一般砌体房屋的可靠性鉴定方法,提出了洪水浸泡后砌体房屋的可靠性鉴定方法。同时,针对历史建筑,提出了XYPEX勾缝加固砖砌体的修复方法,并通过试验研究了XYPEX对砖砌体的承载力和完整性修复方面的效果。
[Abstract]:In recent years, historical buildings and houses with masonry structure as the main body are frequently damaged by flood disaster, which results in the loss of historical value, the loss of historical value, the economic loss of people in villages and towns, and the threat to the safety of life. At present, the study on the mechanical properties of brick masonry under flood immersion is mainly focused on the comparison of compressive and shear resistance under short-term immersion within 24 hours, but the immersion time of brick masonry may reach several days in the actual flood. By studying the mechanical properties of brick masonry under long-term immersion, this paper puts forward the methods of reliability appraisal and strengthening and repairing for masonry buildings after flood immersion, which is one of the research topics that need to be carried out in this paper mainly for mortar and brick. The compressive strength of brick masonry was tested under different soaking time. According to the type of mortar, the masonry masonry was classified and mixed mortar and lime mortar with different mix ratio were used to observe the mortar. The compressive failure phenomenon and compressive strength of brick and brick masonry vary with immersion time. The experimental results show that the strength of the mixed mortar decreases first and then rises and then decreases with the soaking time after 4 days of surface moisture and air drying, and the strength of lime mortar is zero under the wet condition of the surface. Under the condition of air drying, the strength changed little with the soaking time and gradually recovered with the increase of air drying time. After soaking, the strength of brick is stable with immersion time, and the compressive strength of brick masonry decreases gradually with immersion time. Based on the above experimental research and the results of existing literature, the mechanical properties of marinated brick masonry are analyzed. Firstly, the trend of the strength of marinated mortar with soaking time is analyzed, and the practical formula of soaking mortar strength is established by using piecewise function to carry out linear fitting. Based on the experimental values of the compressive strength of marinated mortar, brick and brick masonry, the formula of compressive strength of brick masonry is modified, and the practical formula of compressive strength of marinated brick masonry is established. Based on the analysis of the existing literature, the shear strength model formula for marinated brick masonry is established. Finally, based on the study of the mechanical properties of marinated brick masonry, the influence of water immersion on the reliability of masonry buildings is analyzed. Combined with the reliability appraisal method of general masonry buildings, the reliability identification method of masonry buildings after flooding is put forward. At the same time, aiming at the historical buildings, the paper puts forward the method of repairing brick masonry strengthened with XYPEX hook joint, and studies the effect of XYPEX on the bearing capacity and integrity of brick masonry by experiment.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU364

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