某主厂房天面裂缝原因及防治措施

由变形变化引起的裂缝即主要由温度收缩变化产生应力引起的裂缝，在结构设计中，为防止这样收缩引起的破裂，可以采取“放”的办法，给结构留有自由变形的余地，或者采取“抗”的方法，限制变形，以强度抵抗最大应力．根据经验，宜采取“抗放兼施，以放为主”的作法较为经济可靠。

Analysis and prevention of crack in reinforced concrete building roofs

The deformation cracks in a structure are mostly caused by the s,hrinkage of the structure due to temperature change. In order to prevent these cracks, measures such as providing the structure with a deformation allowance, or increasing the structure strength to restrain the deformation are usually taken in designing the structure. Among the two methods of preventing deformation cracks, the first one was shown to be more reliable and less costing.