混凝土轴心受拉构件最小配筋率与抗裂度的协调

最小配筋率和裂缝宽度是混凝土结构设计中必须同时满足的验算项目。通过对一个工程实例中的轴拉构件进行分析,阐述了现行混凝土设计规范中最小配筋率建议值与抗裂验算的不协调现象。通过分析其原因,提出了与抗裂度相协调的最小配筋率建议值。该建议值既保证了轴拉构件不会出现一裂就断的脆性破坏,又保证了轴拉构件不会一裂就不满足裂缝宽度验算的要求,完成了最小配筋率与抗裂度的协调。

COORDINATION BETWEEN THE MINIMUM REINFORCEMENT RATIO AND CRACK CONTROL OF CONCRETE AXIAL TENSION MEMBERS

In the process of concrete structure design,minimum reinforcement ratio and crack width are two requirements needing to be satisfied simultaneously. An axial tension member in a project is analyzed to indicate that the advised value of the minimum reinforcement ratio is incompatible with the crack control requirements in the current concrete design criteria. In this study,the reason of this phenomenon is found out and a suggested value of the minimum reinforcement ratio considering the crack width requirements is proposed,which makes sure that the axial tension member will not only not break suddenly but also satisfy crack control requirements once it has the first crack.