1979年以来,天津市在研究和生产双钢筋混凝土构件方面,进行了大量的工作,在住宅建筑中已推广应用十几万平米。双钢筋混凝土构件的类型有短向空心板,实心板、整间大楼板、双向密肋复合大楼板。骨料有碎石和陶粒,标号一般为250~＃。实践表明,双钢筋混凝土构件的技术经济指标是好的。目前采用的双钢筋构件,主筋都是采用φ~b4、φ~b5冷拔低碳钢丝。其缺点是单筋 Since 1979, a lot of work has been done on the research and production of double-reinforced concrete components in Tianjin. Tens of thousands of square meters have been applied in residential buildings. Types of double-reinforced concrete members include short-direction hollow slabs, solid slabs, entire building slabs, and two-way multi-ribbed composite slabs. Aggregates are gravel and ceramsites. The number is generally 250~#. Practice shows that the technical and economic indicators of double-reinforced concrete components are good. At present, the double-reinforced steel members adopt the φ~b4 and φ~b5 cold drawn low-carbon steel wire as the main steel bars. The disadvantage is that the single bar