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（奧雅納工程顧問， 廣州 510620）
［摘要］廣州東塔采用了帶伸臂桁架的巨型框架-核心筒體系，其中巨型框架由8根巨柱和6 道環(huán)桁架組成，鋼構(gòu)件用量超過10萬t，鋼結(jié)構(gòu)的防火問題突出。巨柱截面尺寸達(dá)到3 500mm×5 600mm，超出《建筑鋼結(jié)構(gòu)防火技術(shù)規(guī)范》（CECS 200∶2006）中砂漿防火適用范圍，借助ANSYS軟件進(jìn)行模擬分析，論證了50mm厚砂漿防火性能可靠。對(duì)于轉(zhuǎn)換梁耐火極限小于被承托柱耐火極限的問題，建議《建筑設(shè)計(jì)防火規(guī)范》（GB 50016—2014）中確定耐火極限表格中對(duì)于具體鋼構(gòu)件的分類應(yīng)該考慮結(jié)構(gòu)受力特點(diǎn)，根據(jù)其破壞產(chǎn)生的嚴(yán)重性來確定防火等級(jí)和耐火極限。通過理論分析證明工程實(shí)踐中常用標(biāo)準(zhǔn)試驗(yàn)來確定鋼梁防火涂層厚度的做法是偏于不安全的，應(yīng)按照規(guī)范推薦公式計(jì)算確定。同時(shí)通過公式推導(dǎo)，給出基于規(guī)范經(jīng)驗(yàn)公式推導(dǎo)出的鋼梁防火涂層厚度快速判別方法。
［關(guān)鍵詞］鋼結(jié)構(gòu)防火； 巨柱砂漿防火； 耐火極限； 防火涂層厚度
中圖分類號(hào)：TU973文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2016)13-0068-04
Research of fire protection design and construction methods of steel structure of Guangzhou East Tower
Liu Yongce, Xiao Rong
(Arup International Consultants Co., Ltd., Guangzhou 510620， China)
Abstract:Guangzhou East Tower adopts mega frame-core wall with outriggers as its main structural system. The mega frame is comprised of 8 mega columns and 6 belt trusses. The steel dosage exceeds 100 thousand tons and fire protection problem of steel structure is prominent. The mega column section is 3500mm×5600mm that is beyond the application scope of mortar fire protection in Technical code for fire protection of building steel structure (CECS 200∶2006). ANSYS software was used to conduct simulation analysis to prove reliability of fire protection performance of mortar with 50mm thickness. For the problem that fire resistance limit of the transfer beam is smaller than that of supported column, it was proposed that fire resistance limit determination table in Code for fire protection design of buildings (GB 50016—2014) should consider mechanical properties of the structure in classification of concrete steel members, and that the fire rating and fire resistance limit should be determined according to the seriousness of its failure. By theoretical analysis, it is proved that it is not safe to determine the thickness of steel beam fireproof coating by standard test in engineering practice, and the thickness should be determined according to the formula recommended by the code. At the same time, formula was deduced to provide the fast discrimination method of the thickness of steel beam fireproof coating based on the code′s empirical formula.
Keywords:fire protection of steel structure; fire protection of mega column mortar; fire resistance limit; fireproof coating thickness
作者簡介：劉永策，碩士，工程師，Email： yong-ce.liu@arup.com。
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