（1 重庆大学土木工程学院  400045； 2 重庆工商职业学院工程技术系  400051）
【提要】  利用预应力次梁等效荷载对边主梁的有利影响，降低非预应力边主梁扭矩，并对多段预应力布筋形式产生的多段等效荷载进行了改进，利用实用等效荷载方法把多段均布荷载转化为满跨均布荷载，从而方便了楼盖结构的设计。
【关键词】  等效荷载  边主梁  扭矩  不等跨
Large Span Structural Boundary Girder Torsion Simplified Calculation/Jiang Feng 1，2，Li Tangning1（1 School of Civil Engineering，Chongqing Univ.，Chongqing 400045，China；2 Department of Eng. & Tech.，Chongqing Technology and Business Institute，Chongqing 400051，China）
Abstract:Favorable influence of equivalent load distributed prestressed secondary beam is utilized to reduce the torsional moment of boundary girder，and the form of the multisegment uniform distributed load produced by multisegment prestressed reinforcing bar is improved.It utilizes practical equivalent load method to turn multisegment uniform distributed load into fullspan uniform distributed load.The method facilitates the design of floor structure.
Keywords:equivalent load；boundary girder；moment of torsion；unequal span