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（上海聯(lián)創(chuàng)建筑設(shè)計(jì)有限公司北京分公司， 北京 100037）

［摘要］江蘇宿遷某購(gòu)物廣場(chǎng)主塔樓采用型鋼混凝土外筒-鋼筋混凝土核心筒混合結(jié)構(gòu)體系，由于其層高變化不均勻以及上部為loft樓層，使其在豎向呈現(xiàn)不規(guī)則性。通過在設(shè)備層布置帶狀桁架以及l(fā)oft樓層增加外圍層間梁，以增強(qiáng)結(jié)構(gòu)的抗側(cè)剛度，來滿足層間位移角的要求。對(duì)場(chǎng)地特征周期的取值以及多遇地震下選取何種地震影響系數(shù)曲線進(jìn)行了闡述。采用基于抗震性能設(shè)計(jì)方法，復(fù)核不同水準(zhǔn)下結(jié)構(gòu)的承載力與變形抗震性能，包括小震彈性計(jì)算、關(guān)鍵構(gòu)件中震設(shè)計(jì)以及罕遇地震下的彈塑性時(shí)程分析。提出有針對(duì)性的超限設(shè)計(jì)措施，使其能實(shí)現(xiàn)預(yù)定的設(shè)防目標(biāo)。

［關(guān)鍵詞］混合結(jié)構(gòu)； loft樓層； 帶狀桁架； 場(chǎng)地特征周期； 抗震性能

中圖分類號(hào)：TU318, TU973文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2018)15-0025-05

Structural design on out-of-code main tower building of a shopping plaza in Suqian

Niu Lijun

(Beijing Branch of  United Design Group Inc.(Shanghai), Beijing 100037, China)

Abstract:The main tower building of a shopping plaza in Suqian, Jiangsu Province, adopts a hybrid structural system of steel reinforced concrete outer tube and reinforced concrete corewall. Because of its uneven layer height change and the upper loft floors, it has vertical irregularity. The requirements of inter-story drift angle can be satisfied by arranging the waist truss and increasing outer inter-story beams in the loft floor to increase the lateral stiffness of the structure. The value of site characteristic period and the selection of seismic influence coefficient curves under frequent earthquakes were described. Based on the seismic performance design method, the bearing capacity and the seismic performance of the structures under different levels were reviewed, including the elastic calculation under frequent earthquakes, the design of the key members under fortification earthquake and the elasto-plastic time-history analysis under the rare earthquake. Targeted out-of-code design measures were put forward, so that it could achieve a predetermined fortification target.

Keywords:hybrid structure; loft floor; waist truss; site characteristic period; seismic performance

作者簡(jiǎn)介：牛麗軍，碩士，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email:asdniu_2004@126.com。