强震区现浇预应力框架结构设计中的若干问题

海口美兰机场航站楼一期工程处于强震区，故采用有粘结预应力，以利于抗震。由于预应力次梁跨度较大，且连续梁为不等跨，与之相连的主梁中会引起较大扭矩，主梁抗扭问题不容忽视。肋梁现场测试结果表明，张拉某根梁时相邻梁位移的影响约占张拉大梁位移的１５％，而对间隔梁的影响可忽略不计。

SOME PROBLEMS OF A CAST-IN-PLACE PRESTRESSED CONCRETE FRAMED STRUCTURE IN A STRONG EARTHQUAKE REGION

The first stage of the aviation building of the Haikou Meilan Airport project has been located in a strong earthquake region.It is,therefore,that a prestress with bond method has been adopted,which would be beneficial to its earthquake resistance.Because the spans of prestressed minor beams are comparatively long and various,and they connected with their adjacent major beams,thus there would induce considerable twisting moment in the adjacent major beams.The major beam' s twist moment should not be neglected.The field test of rib-beam has demonstrated that in tensioning a rib beam,the displacement of adjacent beams would occupy an amount 15% of the tensioning beam' s displacement.While the displacement of other beams than next could be neglected.