钢筋混凝土楼面梁或屋面大梁腹部裂缝北京铁路局北京勘测设计院钱益智现象在混合结构房屋中，经常采用钢筋混凝土屋面梁和楼面梁，这些梁有的选用进深梁标准设计图集，也有的是按该项工程的实际情况进行单独设计。这些梁的配筋构造均符合现行《混凝土结构设计规范》（ＧＢ... Reinforced Concrete Floor Beams or Abdominal Cracks in Roof Beams Beijing Railway Administration Beijing Survey and Design Institute Qian Jingzhi Phenomenon In mixed-structure buildings, reinforced concrete roof beams and floor beams are frequently used, and some of these beams are used to select the standard design drawings for deep beams. There are also separate designs based on the actual conditions of the project. The reinforcement structures of these beams are in line with the current “Specifications for Design of Concrete Structures” (GB...