铁道建筑

针对整体式桥面T梁横向受力问题，本文提出一种基于实体有限元的横向受力计算方法，对梁体在设计荷载下的横向应力、节段内力进行分析，验证了传统杆系单元薄壁框架模型对T梁横向受力计算的精度。结果表明，在活载和温度荷载作用下，整孔梁的最大横向拉应力出现在横隔板处，不同荷载下桥面板顶部的最大横向拉应力的位置受横隔板影响；对于T梁纵向1m长节段的顶板，在恒载、活载、温度荷载、组合荷载作用下，实体单元法计算的弯矩绝对值的最大值分别是杆系单元法的0.92倍、0.69倍、1.56倍、0.99倍；对于T梁纵向1m长节段的腹板，在恒载、活载、温度荷载、组合荷载作用下，实体单元法计算的弯矩绝对值的最大值分别为杆系单元法的0.46倍、0.46倍、0.89倍、1.25倍；组合荷载作用下，杆系单元法和实体单元法计算的顶板弯矩图基本一致，腹板弯矩图存在区别。

Aiming at the problem of transverse force of T-beam of integral bridge deck， a transverse force calculation method based on solid finite element is proposed in this paper. The transverse stress and segment internal force of T-beam under design load are analyzed， and the accuracy of transverse force calculation of T-beam by traditional thin-walled frame model is verified. The results show that under the action of live load and temperature load， the maximum transverse tensile stress of the whole hole beam appears at the diaphragm， and the position of the maximum transverse tensile stress at the top of the bridge deck under different loads is affected by the diaphragm. For the roof of the longitudinal 1m long segment of the T beam， under the action of dead load， live load， temperature load and combined load， the maximum absolute value of the bending moment calculated by the solid element method is 0.92 times， 0.69 times， 1.56 times and 0.99 times that of the bar element method respectively. For the web of the longitudinal 1m long segment of the T beam， under the action of dead load， live load， temperature load and combined load， the maximum absolute value of the bending moment calculated by the solid element method is 0.46 times， 0.46 times， 0.89 times and 1.25times that of the bar element method， respectively. Under the combined load， the roof bending moment diagram calculated by the bar element method and the solid element method is basically the same， and the web bending moment diagram is different.