论文部分内容阅读
在大比例长悬臂梯形截面混凝土箱梁模型受弯性能试验研究的基础上,结合混凝土箱梁的特点,通过选用相应的单元类型和材料本构关系,运用ANSYS大型有限元分析程序模拟了试验全过程,模拟结果与试验结果吻合较好;大量参数分析表明:在弹性受力范围内,宽跨比是影响翼缘有效宽度计算系数的主要因素;在承载力极限状态下,影响翼缘有效宽度计算系数的主要因素有宽跨比、纵向受拉区钢筋配筋率、钢筋屈服强度以及混凝土抗压强度。分别给出了翼缘有效宽度计算系数在弹性工作状态下和承载力极限状态下的计算公式,为初等梁理论应用于解决混凝土箱梁正截面受弯承载力计算提供了试验和理论依据。
Based on the experimental study of the bending performance of large-span long-span trapezoidal concrete box girder models, combining the characteristics of the concrete box girder, the corresponding unit types and material constitutive relationships are selected, and the full-scale ANSYS program is used to simulate the test. The simulation results are in good agreement with the experimental results. A large number of parameter analysis shows that the width-span ratio is the main factor affecting the effective width calculation factor of the flange in the elastic force range; in the limit state of the bearing capacity, the effective width of the flange is affected. The main factors for the calculation of the coefficient are the width-span ratio, the ratio of reinforcement in the longitudinal tension zone, the yield strength of the steel bar, and the compressive strength of the concrete. The calculation formulas of the effective flange width calculation coefficient under the elastic working state and the limit state of the bearing capacity are given respectively, which provides the experimental and theoretical basis for the calculation of the flexural bearing capacity of the concrete box girder under the initial beam theory.