一、纵向裂缝产生的原因沿板缝方向产生纵向裂缝的因素较多 ,程度也不尽相同 ,但归结起来 ,主要有如下几种 :一是板缝嵌缝质量低劣。装配式板是由多块条板拼接而成的体系 ,条板之间灌缝后成柱铰连接 ,能传递剪力 ,但不能传递弯矩 ,虽然仍非一体 ,但具有一定的整体性。相邻板之 First, the causes of longitudinal cracks Longitudinal cracks along the direction of the plate there are many factors, the extent is not the same, but summed up, there are the following: First, the poor quality of the plate caulking. Assembled panels are spliced ​​by a number of strips of the system, the slab between the post-filling joints into a column, can transmit shear, but can not pass the moment, although still not one, but with a certain integrity. Adjacent board