当建筑的长度过大、平面图形有曲折变化或同一建筑物的个别部分荷载、高度及地基承载力有很大不同时,建筑构件由于温度变化、地基的不均匀沉陷或地震的原因产生变形,引起建筑物不规则裂缝或破坏,为了避免建筑物出现这种不利情况,常在建筑设计与施工时,预先留变形缝将建筑物分开。但是,预留变形缝需增加相应的构造措施,亦不经济,同时因设 When the length of the building is too large, the plane figure has zigzag changes, or the load, height and foundation bearing capacity of the individual parts of the same building are very different, the building components are deformed due to temperature changes, uneven subsidence of the foundation or earthquake. Caused by irregular cracks or damage to buildings, in order to avoid such unfavorable conditions in the building, often in the design and construction of the building, leaving deformation joints in advance to separate buildings. However, the preparation of deformation joints needs to increase the corresponding structural measures and is not economical.