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（中國建筑西北設(shè)計(jì)研究院有限公司， 西安 710018）
［摘要］西咸新區(qū)1A樓高位三層整體向東、南方向突出，具有偏心布置、尺寸突變、豎向構(gòu)件不連續(xù)等特性，屬于特別不規(guī)則建筑，采用的是純鋼框架-中心支撐核心筒-懸挑桁架的結(jié)構(gòu)體系。詳細(xì)介紹了該項(xiàng)目在超限結(jié)構(gòu)設(shè)計(jì)中五方面的設(shè)計(jì)難點(diǎn)：結(jié)構(gòu)的選型、懸挑結(jié)構(gòu)的處理、結(jié)構(gòu)耗能機(jī)制及二道防線的計(jì)算、關(guān)鍵構(gòu)件性能目標(biāo)的確定、人字形中心支撐橫梁不平衡力的驗(yàn)算方法等。同時(shí)，針對超限專家提出的意見采取了相應(yīng)的加強(qiáng)措施。
［關(guān)鍵詞］中心支撐核心筒； 懸挑桁架； 耗能機(jī)制； 結(jié)構(gòu)選型； 人字形中心支撐； 不平衡力驗(yàn)算
中圖分類號(hào)：TU391文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)14-0020-05
Analysis on difficulties for out-of-code structural design of 1A building in Xi-Xian New Area
ZHANG Tao, WANG Hongchen, CHU Ling
(China Northwest Building Design & Research Institute Co., Ltd., Xi′an 710018, China)
Abstract:The three stories in the high zone of the 1A building in Xi-Xian New Area protrudes to the southeast, with eccentric layout, abrupt size changes, and vertical component discontinuity. It belongs to a special irregular building and adopts the pure steel frame, concentrically braced corewall and cantilever truss in the structural system. The design difficulties of the project in five aspects of the out-of-code structural design were introduced in detail, including the selection of the structural system, the treatment of the cantilevered structure, the calculation of the energy dissipation mechanism of the structure and the calculation of the second line of seismic defense, the determination of the performance goals of key components, and the calculation method of the unbalanced force of the herringbone-shaped concentrically braced beam.At the same time, the corresponding strengthening measures were carried out in view of the opinions made by over\|limit experts.
Keywords:concentrically braced corewall; cantilever truss; energy dissipation mechanism; structural system selection; herringbone-shaped concentrically brace; calculation of unbalanced force
作者簡介：張濤，碩士，高級(jí)工程師，Email：715022465@qq.com。
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