造成砖混结构顶层墙体开裂的因素固然很多,但其中最关键的因素,还是屋面保温隔热层问题。相当一部分屋面保温隔热层的厚度和施工质量未达到设计要求,或设计厚度过小,无法满足热工计算要求。由于屋面受阳光辐射时间比墙体长,吸收热量多,大量的热直接传给空心板或现浇板。此外钢 There are many factors that cause cracks in the wall of the top floor of a brick-concrete structure, but the most critical factor is the problem of roof insulation. A considerable part of the thickness and construction quality of the roof insulation layer did not meet the design requirements, or the design thickness was too small to meet the thermal calculation requirements. As the roof is exposed to sunlight for longer than the wall, it absorbs more heat and a large amount of heat is directly transmitted to the hollow slab or cast-in-place slab. In addition to steel