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（1 甘肅省工程設(shè)計研究院有限責(zé)任公司，蘭州 730000；2 蘭州大學(xué)土木工程與力學(xué)學(xué)院，蘭州 730000）
［摘要］某標(biāo)志塔地上26層，主體高89.5m，高寬比為11.25，平面呈不規(guī)則的扇形，除頂部4層采用鋼筋混凝土框架結(jié)構(gòu)外，其余樓層采用鋼筋混凝土剪力墻結(jié)構(gòu)。該工程存在扭轉(zhuǎn)不規(guī)則、豎向結(jié)構(gòu)體系變化和高寬比過大等問題。針對問題采取的措施為：在墻肢端部設(shè)置翼緣，增大了抗扭剛度；結(jié)合電子廣告牌對結(jié)構(gòu)剛度要求較高、但該塔平時無人使用和工作的特點(diǎn)，按剪力墻結(jié)構(gòu)和框架結(jié)構(gòu)的限值分別控制層間位移角；對結(jié)構(gòu)進(jìn)行抗震性能設(shè)計，保證了結(jié)構(gòu)底部加強(qiáng)區(qū)滿足中震抗剪彈性和抗彎不屈服的要求；進(jìn)行了大震彈塑性時程分析，驗(yàn)證了結(jié)構(gòu)能夠達(dá)到“大震不倒”的設(shè)防目標(biāo)；針對高寬比過大引起的地基零應(yīng)力區(qū)過大的問題，采用了樁筏聯(lián)合基礎(chǔ)，提高了結(jié)構(gòu)的抗傾覆能力。上述措施較為經(jīng)濟(jì)合理。
［關(guān)鍵詞］扇形平面；扭轉(zhuǎn)不規(guī)則；標(biāo)志塔；豎向不規(guī)則；大高寬比；傾覆穩(wěn)定性
中圖分類號：TU973文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2021)03-0011-08
Structural design of a fan-shaped landmark tower with large height-width ratio
YANG Zhongping1, ZHANG Jingshu2, GUO Hang2, PENG Gaopeng1, GUO Shigang1
(1 Gansu Engineering Design Research Institute Co., Ltd., Lanzhou 730000, China;2 College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China)
Abstract:The height of a landmark tower which has 26 floors is 89.5m with height-width ratio of 11.25. The plane is an irregularity sector. The structure of top 4 floors adopts the reinforced concrete frame structure, and the structure of the rest of the floors adopts the reinforced concrete shear wall structure. The project has problems such as irregular torsion, vertical structural system changes and excessive height-width ratio. To solve these problems, measures taken can be seen as follows. The flange was set at the end of the shear wall limb to increase the torsional rigidity. According to the characteristics of electronic billboards that required higher structural stiffness, but the tower was not used and works at ordinary times, the inter-story displacement angle was controlled according to the limit value of shear wall structure and frame structure. The seismic performance design of the structure was carried out to verify that the reinforced area at the bottom of the structure met the requirements of shear elasticity and bending resistance under fortification earthquake. Then the elastic-plastic time history analysis were carried out to verify that the structure meets the requirement of “no collapse under rare earthquake”. Aiming at the problem of too large zero-stress area of the foundation caused by the excessive height-width ratio, the pile raft foundation was adopted to improve the anti-overturning ability of the structure. The above measures were relatively economical and reasonable.
Keywords:fan-shaped plane;torsional irregularity; landmark tower;vertical irregularity;large height-width ratio;overturning stability
*甘肅省建設(shè)科技項(xiàng)目（JK2020-12）。
作者簡介：楊忠平，學(xué)士，高級工程師，Email: yangzp5818@126.com。
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