地面上的住宅板是否需要收缩缝，无论是素混凝土、钢筋混凝土还是后张混凝土；如果有，在住宅板中安装接缝是否有特殊考虑

Are contraction joints necessary in residential slabs-on-ground, whether for plain, reinforced, or post-tensioned (PT) concrete; and, if so, are there special considerations to installing joints in residential slabs