And it can be concluded that cracks on top floor ' s walls are caused by the temperature difference between floor or wall ' s inner and outer surface and the temperature difference between floor and walls . if the floor and wall ' s thermal resistance is appropriate , the cracks issue on cscbb can be solved 分析表明，砌体建筑顶层墙体的裂缝主要是墙体、屋面板内外表面温度差异和屋面板、墙体之间的温度差异所致，因此如果墙体和屋面的保温隔热措施合适，砌体建筑的温度裂缝问题是可以解决的。
This paper mainly studied the changing material regularity and the research of bearing capacity on damaged room slabs , steel corrosion is the based reason that caused structural damage and bearing capacity fall . so the paper carried out the bearing capacity experiment of six pieces of room slabs . the paper studied the changing property characteristic and the affecting degree of damage to bearing capacity 本文通过工程实例调查与试验研究相结合的方法，研究了钢筋锈蚀后性能变化规律；对破坏程度各不相同的六块屋面板加载试验，探求了构件破损后工作性能、变化特征和破损后对承载力的影响。
