钢筋混凝土梁裂缝宽度计算分析

为判断和验证GB 50010—2010《混凝土结构设计规范》中裂缝宽度计算的有效性问题,采用理论分析和案例计算的方法讨论裂缝计算公式的适用性。得出规范公式,只要梁上有荷载作用均能计算出裂缝宽度,不符合梁裂缝开展条件;只有梁受拉边缘应力超过材料强度时才会出现裂缝。该文运用理论分析及案例计算得出梁裂缝宽度并非从0开始。规范公式计算裂缝宽度小于临界值时裂缝并未开展,应通过材料力学原理计算最小裂缝宽度。梁裂缝限制时弯矩一般小于承载力极限状态。

In order to judge and verify the validity of crack width calculation in GB 50010—2010 Code for Design of Concrete Structures,the applicability of crack calculation formula is discussed by means of theoretical analysis and case calculation.It is concluded that the crack width can be calculated as long as there is a load on the beam,which does not meet the conditions for the development of the beam crack,and the crack will occur only when the tensile edge stress of the beam exceeds the material strength.In this paper,theoretical analysis and case calculation show that the beam crack width does not start with 0.When the crack width calculated by the standard formula is less than the critical value,the crack does not develop,and the minimum crack width should be calculated by the principle of material mechanics.When the beam crack is limited,the bending moment is generally less than the limit state of bearing capacity.