预制混凝土梁吊点处应力集中效应的讨论

Discussion on Stress Concentration Effect at the Hoisting Point of Precast Concrete Beam

预制混凝土梁在吊装时可能会由于应力集中而导致构件开裂,影响使用寿命。使用有限元软件ABAQUS分析了梁截面尺寸、吊具形式和补强钢筋等因素对吊点处应力集中的影响。基于大量的数值分析,得出了考虑吊点应力集中效应的梁面折算正应力公式及相关系数的取值,以保证在设计中对预制混凝土梁的裂缝控制。

Precast concrete beams may crack due to stress concentration during hoisting,which affects it’s service life.In this paper,the finite element software ABAQUS is used to analyze the influence of beam section size,spreader form and reinforcing steel bar on stress concentration at the hoisting point.Based on a large number of numerical analysis,the normalized stress equation of the beam surface and the values of the correlation coefficient,which consider the stress concentration effect of the hoisting point,are obtained to ensure the crack control of the precast concrete beam in the design.