论文部分内容阅读
为了研究适用于公路混凝土槽形梁行车道板内力的计算方法,将公路混凝土槽形梁比拟成带有边梁的弹性矩形薄板,考虑边梁的挠曲和扭转,运用功的互等定理,推导出槽形梁的挠曲面方程,求得行车道板弯矩及挠度的计算公式,提出了边梁抗弯刚度及抗扭刚度的合理计算方法。采用该方法对一足尺模型试验梁进行了计算,并分别采用有限条法、比拟板理论、梁理论对不同边梁高度的槽形梁模型在轮载作用下行车道板的内力进行了计算分析。研究结果表明:运用比拟板理论计算行车道板中部在轮载作用下的弯矩及挠度具有较高精度;相较于梁理论,比拟板理论可进一步反映截面尺寸变化对槽形梁内力的影响及其整体受力特点。
In order to study the calculation method of internal force of roadway slab girder used in highway concrete, the concrete slab beam of highway is compared with the elastic rectangular thin slab with side girder, considering the deflection and torsion of side girder, using the reciprocal theorem of work, The equation of flexural surface of grooved beam is deduced, the calculation formula of bending moment and deflection of traffic lane slab is obtained, and the reasonable calculation method of bending stiffness and torsional stiffness of side beam is proposed. A full-scale model test beam was calculated by using this method. The calculation and analysis of the internal forces of the roadway slab under the wheel load were carried out by using the finite strip method, the slab theory and the beam theory respectively. The results show that using the plate theory to calculate the bending moment and deflection of the middle section of the roadway slab under wheel load has higher accuracy. Compared with the beam theory, the slab theory can further reflect the influence of the cross-section dimension on the internal force of the grooved beam And its overall force characteristics.