在现浇 RC 框架实际结构中，楼板整浇后对结构整体性的增强作用使框架梁矩形 截面实际内力中存在不可忽略的轴力． 对竖向和侧向荷载作用下的 RC 框架梁矩形截面 内轴力沿着梁跨分布规律进行了研究，并分析了不同楼板布置形式下的 RC 框架梁内轴 力分布规律，研究结果表明:整浇楼板是框架梁内实际轴力沿梁跨呈不均匀分布的直接原 因，并且在负弯矩作用端为轴压力，数值不可忽略，设计过程应对其进行合理考虑;整浇楼 板对框架梁内实际轴力的影响方式为通过限制梁轴向变形从而使其产生梁内轴力;整浇 楼板主要对与之直接相连的框架梁内轴力产生直接影响，对不与之直接相连的框架梁内 轴力分布情况基本不产生影响． 此外，还在此基础上，分别对正负弯矩作用下的框架梁进 行了梁内轴力产生原因和组成分析，并进一步给出了考虑整浇楼板对框架梁影响的设计 建议，以期能更好实现“强柱弱梁”．

In cast-in-situ Reinforced Concrete (RC) frame structures，the strengthening effect of monolithic slab on the structural integrity makes actual axial force in frame beam cannot be ignored． The axial force distribution of frame beam along beam span in regular RC frame structures subjected to vertical and lateral loading were respec- tively detailedly analyzed． Moreover，the axial force distributions corresponding to different arrangement of mono- lithic slabs in RC frame structures were also studied and compared with each other． The research results show that: monolithic slab is the main reason of beam axial force uneven distribution in actual RC frames and the axial force presents as axial compression force at beam end with hogging moment which cannot be ignored during design stage; the influencing way of monolithic slab is to limit the axial deformation of beam and consequently generate beam axial force; monolithic slab mainly influence the frame beams which are directly connected with it，and almost has no influence on the frames beams which are not directly connected with it． Based on this，the causes and composi- tions of beam axial forces under the action of sagging and hogging moments were studied respectively． Then a de- sign recommendation considering the influence of monolithic slab on frame beam was proposed to improve the reali- zation effect of strong column weak beam．