混凝土受弯构件抗裂最小配筋率的讨论

简述GB50010—2002《混凝土结构设计规范》中混凝土受弯构件最小配筋率确定方法,对比中外混凝土设计规范中最小配筋率限值;通过工程实例阐明满足GB50010—2002规范中最小配筋率的钢筋混凝土受弯构件,其裂缝不满足规范限值的现象;以开裂弯矩作用下的裂缝宽度不超规范限值为原则,确定抗裂最小配筋率;分析结果表明:混凝土受弯构件抗裂最小配筋率控制设计。

MINIMUM REINFORCEMENT RATIO IN CONCRETE BENDING MEMBERS BASED ON COORDINATION WITH CRACK CONTROL

The determination of minimum longitudinal reinforcement ratio of flexural concrete members in Code for Design of Concrete Structures (GB 50010-2002) is presented in this paper. And this paper compares the limit of the minimum longitudinal reinforcement ratio in Chinese concrete design criteria with other countries' criteria. The crack width of a bending member does not satisfy the criteria's limit requirement while minimum reinforcement satisfied through an engineering example. The paper suggests a new formula of the minimum reinforcement ratio, whose serviceability is taken into account to assure that the minimum reinforcement ratio is compatible with the crack control.