钢筋混凝土井字梁是从钢筋混凝土双向板演变而来的一种结构形式。双向板是受弯构件,当其跨度增加时,相应板厚也随之加大。但板的下部受拉区的混凝土一般都不考虑它起作用,受拉主要靠下部钢筋承担。本文主要研究建筑井字梁计算与设计应注意的几个问题。 Reinforced concrete cross-beam is a two-way plate from the evolution of a structural form. Two-way plate is flexural members, when the span increases, the corresponding thickness also increases. However, the lower part of the slab of the concrete slab generally do not consider it work, mainly by the lower part of the tension to bear. This article mainly studies several problems that should be paid attention to in the calculation and design of wellbore of building.