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砖混结构住宅楼滞后裂缝,是指住宅楼在交付使用1～2年(甚至更长的时间)内出现的结构裂缝,其危害在于它产生的滞后性,而且很难维修。一、原因分析1.底层窗下墙两侧竖直裂缝。这类裂缝多发生在多层住宅楼的底层窗台下两侧,呈竖直开裂。发生的时间多在住宅楼竣工后的半年内。窗台下如设有暖气龛,裂缝多出现在暖气龛两侧的墙体上。主要原因是,外纵窗间墙既承受自身荷载,又承受上部窗过梁传来的荷载,同时还要承受内
The hysteresis cracks in a brick-concrete residential building refer to structural cracks that occur within 1 to 2 years (or even longer) of the delivery of the residential building. The danger is the hysteresis it generates and it is difficult to maintain. First, the reason analysis 1. The vertical cracks on both sides of the bottom wall of the bottom window. Most of these cracks occur on both sides of the bottom ledge of a multi-storey residential building and are cracked vertically. Most of the time occurred within six months after the completion of the residential building. Under the window sill, if there is heating, cracks appear on the walls on both sides of the heating bowl. The main reason is that the outer vertical partition wall bears both the self load and the load from the upper window lintel, and it also bears the internal load.