(1.中广国际建筑设计研究院，北京100034；2.北京市建筑工程研究院，100039)
［提要］介绍了某办公楼地下室加层改造的框架柱加固及双向预应力楼板设计方案，并利用ANSYS有限元分析软件对该房屋边缘构件对加层楼板中预应力建立的影响进行了分析和探讨。结果表明，对于预应力板柱结构，边缘构件对与之平行的预应力的建立影响较大。
［关键词］预应力；板柱结构；有限元分析；边缘构件
Reconstruction Design and Finite Element Analysis of Prestressing Effects of a Newadded Underground Floor of an Office Building/Gao Huizong1,Liu Hang2,Wu Wenqi2（1 Zhongguang Building Design & Research Institute International, Beijing 100034,China;2 Beijing Building Construction Research Institute, Beijing 100039,China）
Abstract:Reconstruction design of twoway prestressed slabs and strengthening of frame columns of a newadded underground floor of an office building are introduced. ANSYS finite element analysis program is used to analyze the prestressing effects of the slab due to boundary members. It is shown that for prestressed slabcolumn structure, the boundary members will greatly influence the parallel prestressing force in the slab.
Keywords:prestress; slabcolumn structure; finite element analysis; boundary members