½éÉÜ£º 1.½á¹¹µÄλÒÆ Displacements of structures ÏßλÒÆ£º½á¹¹Ä³µãÒƶ¯µÄ¾àÀ루£©Linear displacements or translation: the distance of movement of a point alone a line; ½ÇλÒÆ£¨×ª½Ç£©£º½á¹¹¹¹¼þij½ØÃæתµÄ½Ç¶È£¨£©Angular displacement or rotation:sectional rotation of a member of a structure. Ïà¶Ô£¨Ïߣ©Î»ÒÆ£ºÁ½µãÖ®¼ä¾àÀë±ä»¯ Relative linear displacement: the change of the distance between 2 points. Ïà¶Ô½ÇλÒÆ£¨×ª½Ç£©£ºÁ½½ØÃæÖ®¼ä¼Ð½Ç±ä»¯ Relative angular displacement:the change of the angle between 2 sections. 2.¹ãÒåλÒƵĸÅÄî Generalized displacements Ϊ±ãÓÚ½øÐÐÀíÂÛ·ÖÎöºÍ¹«Ê½ÍƵ¼£¬½«ËùÌÖÂ۵ĸ÷ÖֽṹλÒÆÓÃͳһµÄ·ûºÅÀ´±íʾ¡ª£¬³ÆΪ¹ãÒåλÒÆ¡£For the convenience of the proceeding of theoretical analysis and derivation of formulae, we denote all kinds of displacements by , which is termed as generalized displacements ×¢Remark£º¹ãÒåλÒÆ¿ÉÒÔ¿´³ÉΪ´ú±íλÒƵijéÏó·ûºÅ£¬ÔÚ¾ßÌåÎÊÌâÖбíʾ¾ßÌåλÒÆ. Generalized displacements may be looked at as abstract sign, which represents concrete displacement in concrete problems.