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（廣州容柏生建筑結(jié)構(gòu)設(shè)計(jì)事務(wù)所， 廣州 510170）

［摘要］3/4支撐是指支撐交點(diǎn)位于支撐節(jié)間高度h的3/4處的支撐。基于等效水平集中荷載，以頂點(diǎn)位移最小化為設(shè)計(jì)目標(biāo)進(jìn)行拓?fù)鋬?yōu)化得到的3/4支撐，其荷載邊界條件與實(shí)際工程中常見的跨層支撐有一定區(qū)別，設(shè)計(jì)時(shí)需要判斷其差異性。層間位移角和頂點(diǎn)位移作為不同設(shè)計(jì)目標(biāo)的差異亦不能忽略。對(duì)高寬比2～12有限元模型進(jìn)行參數(shù)化分析，結(jié)果表明：總體來看，高寬比越大則3/4支撐的抗側(cè)效率越高，有可能超過交叉支撐；隨支撐截面加大或柱截面減小，3/4支撐的抗側(cè)效率會(huì)逐漸提高；彎曲變形的比例越高，則3/4支撐越有效；3/4支撐角度的突變會(huì)導(dǎo)致層剛度的突變和層間位移角不均勻，內(nèi)筒的存在有助于緩解此問題；3/4支撐的扭轉(zhuǎn)剛度稍差于交叉支撐，對(duì)于平面不規(guī)則的結(jié)構(gòu)需要關(guān)注其差異。

［關(guān)鍵詞］高寬比； 3/4支撐； 交叉支撐； 拓?fù)鋬?yōu)化； 結(jié)構(gòu)效率

中圖分類號(hào)：TU318文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)04-0044-05

Study on structure efficiencies of 3/4 brace and cross brace with different height to width ratios

Chen Yin, Chen Xiaohang, Huang Yuangen

(RBS Architectural Engineering Design Associates, Guangzhou 510170, China)

Abstract:The 3/4 brace refers to the brace where the brace intersection is located at 3/4 of the total height h of the brace. Based on the equivalent horizontal concentrated load, the top point displacement minimization was taken as the design goal to conduct topology optimization to obtain the 3/4 brace, of which the load boundary conditions were different from the common cross-story brace in actual engineering, so the difference needs to be judged during design. The differences between inter-story displacement angles and top point displacements as different design goals could not be ignored. Parametric analysis of the finite element model with a height to width ratio of 2 to 12 shows that in general, the larger the ratio is, the higher the resisting lateral force efficiency of the 3/4 brace is, which may exceed that of the cross brace; as the brace cross section increases or the column cross section decreases, the resisting lateral force efficiency of 3/4 brace will gradually increase; the higher the proportion of bending deformation is, the more effective the 3/4 brace is; the abrupt change of the 3/4 brace angle will cause the abrupt change of the story stiffness and the uneven inter-story displacement angle, and the existence of the inner tube helps to alleviate this problem; the torsional stiffness of the 3/4 brace is slightly worse than that of the cross brace, and it is necessary to pay attention to the difference for the plane irregular structure.

Keywords:height to width ratio; 3/4 brace; cross brace; topology optimization; structural efficiency

作者簡(jiǎn)介：陳寅，碩士，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email：chenyin@gzrbs.com。