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（中國建筑西北設(shè)計(jì)研究院，西安710003）

［提要］延安體育場東看臺(tái)與健身廣場采用后張有粘結(jié)預(yù)應(yīng)力混凝土框架結(jié)構(gòu)，健身廣場第一跨為275m預(yù)應(yīng)力混凝土轉(zhuǎn)換梁，東看臺(tái)采用2728m預(yù)應(yīng)力混凝土框架梁，使跨河跨路工程解決了市區(qū)排洪與交通問題。對(duì)梁端負(fù)彎矩較大的部位采取豎向加腋或水平加腋，有效地解決了露天結(jié)構(gòu)中構(gòu)件不出現(xiàn)裂縫的設(shè)計(jì)要求。對(duì)東看臺(tái)中間支座梁端負(fù)彎矩較大部位，采用一端在梁內(nèi)固定，另一端在第二跨梁底或梁側(cè)張拉的拋物線布筋方式，避免了因連續(xù)布筋過多造成預(yù)應(yīng)力偏心彎矩過大而引起的邊柱或懸臂梁受力不合理的現(xiàn)象。給出了結(jié)構(gòu)的特點(diǎn)和節(jié)點(diǎn)構(gòu)造，以及預(yù)應(yīng)力轉(zhuǎn)換梁施工階段驗(yàn)算結(jié)果及預(yù)應(yīng)力筋分段分批張拉的施工順序。

［關(guān)鍵詞］預(yù)應(yīng)力混凝土框架；轉(zhuǎn)換梁；預(yù)應(yīng)力次彎矩；施工驗(yàn)算；張拉順序

Design of Great Span Prestressed Reinforced Concrete Frame in Yan"an Stadium/Tian Min，Wang Ruiru（China Northwest Building Design Research Institute, Xi"an 710003，China）

Abstract:The bonded post-stressed concrete frame is used in the stand and playground of Yan"an StadiumThe first post-stressed concrete transfer beam of the playground is 27.5m, and the post-stressed concrete beam of the east stand is 27.28m. Horizontal and vertical haunch is used. The beam negative moment is big.The parabolic cable, whose one end is anchored in beam and the other end is stretched at the beam bottom or side, is used in the place of the east stand beam whose negative moment is big in middle pedestal. Some characteristics of the design and constructional detail of the frame joint are introduced. The checking calculation of the post-stressed concrete transfer beam in the construction period and the stretching sequence of the deformed bar is also introduced.

Keywords:poststressed concrete frame；transferbeam；submoment；checking calculation；stretching sequence