(同济大学  上海 200092)
【提要】  采用近似的线性节点刚度来反映连接的非线性弯矩转角关系，提出了正常使用极限状态下半刚性连接无侧移组合框架梁挠度的简化计算方法。分析常用的几种线性节点刚度对组合框架挠度的影响，给出了可应用于实际设计的合理的线性割线刚度模型。通过与有限元方法计算结果比较，表明建议的简化方法具有可接受的精确度，而且对节点特征的线性简化不太敏感。
【关键词】  挠度  正常使用极限状态  无侧移组合框架  半刚性节点  简化线性节点刚度
Simple Calculation of Serviceability Deflections of Continuous Beams for Composite Frames with Semirigid Connections/Wang Jingfeng,Li Guoqiang,Liu Qingping(Depart. of Civil Eng.,Tongji University,Shanghai 200092,China)
Abstract:A relativity simple method for calculating the deflections of beams in nonsway  composite frames provided with semirigid beamtocolumn connections is developed.It  approximates the true nonlinear connection momentrotation relation with simplified linear connection stiffness.The effect of several simplified linear  connection stiffness on the composite frames is studied and reasonable linear connection secant  stiffness is suggested.Comparisons with deflection from finite element method show the  proposed method  is  of acceptable accuracy and  is  comparability insensitive to the exact  simplifications made concerning connection characteristics.
Keywords:deflection; serviceability；nonsway composite frames；semirigid connections；simplified linear connection tiffness
*国家杰出青年科学基金资助项目(50225825)。