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(東南大學(xué)建筑設(shè)計(jì)研究院有限公司, 南京 210096)

摘要: 南京揚(yáng)子江智慧中心為大型城市綜合體建筑,地下 3 層,地上為四塔建筑,建筑平面為上窄下寬收腰型平面,體型復(fù)雜. 巨型桁架位于底部裙樓南側(cè),高度為 16. 5m,寬度為 4. 1m,跨度為 62. 9m,平面投影為弧形;桁架內(nèi)側(cè)為指揮大廳,外側(cè)為連廊,均 3 層通高. 由于桁架跨度和高寬比較大,在屋面壓力作用下易發(fā)生平面外失穩(wěn);對(duì)于弧狀桁架,桁架結(jié)構(gòu)質(zhì)心位于支座連線之外,沿支座連線方向的附加彎矩增大了桁架失穩(wěn)的風(fēng)險(xiǎn),需采用有效的結(jié)構(gòu)形式和構(gòu)造措施,以保證桁架正常工作. 采用結(jié)構(gòu)概念設(shè)計(jì)、多模型包絡(luò)設(shè)計(jì)和有限元數(shù)值分析等多種力學(xué)分析方法,以實(shí)現(xiàn)結(jié)構(gòu)既定性能設(shè)計(jì)目標(biāo). 補(bǔ)充偶然荷載作用下結(jié)構(gòu)抗連續(xù)倒塌和人行荷載作用下結(jié)構(gòu)樓板舒適度兩種驗(yàn)算工況,保證巨型桁架滿足承載能力極限狀態(tài)和正常使用極限狀態(tài)要求.

關(guān)鍵詞: 巨型弧狀桁架; 平面外穩(wěn)定; 性能設(shè)計(jì); 抗連續(xù)倒塌; 樓板舒適度

中圖分類號(hào):TU393. 3 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002-848X(2023)02-0042-08

DOI:10. 19701 / j. jzjg. ZJ220033

Design of giant arc-shaped three-dimensional truss for Nanjing Yangtze River Wisdom Center

WANG Zhiming, CAO Rong, SUN Xun, ZHAO Yingkai, WANG Yongchun

(Architects & Engineers Co. , Ltd. of Southeast University, Nanjing 210096, China)

Abstract: Nanjing Yangtze River Wisdom Center is a large-scale urban complex building with three underground floors andfour towers above ground. The waist-shaped building plane is narrow at the top and wide at the bottom. The shape of thebuilding is complicated. The giant truss is located on the south side of the bottom podium, with the height of 16. 5m, thewidth of 4. 1m and the span of 62. 9m, and the plane projection of the truss is arc-shaped. The inner side of the truss is acity command hall, and the outer side is the cantilevered veranda, both of which are 3-storey high. Due to the large spanand height-width ratio of the truss, out-of-plane instability easily occurs under the action of compressive stress; for the arcshaped truss, the center of mass of the truss structure is located outside the connection line of the support, and theadditional bending moment along the line of the support increases the instability risk of the truss. Effective structural formsand structural measures should be adopted to ensure the normal operation of the truss. A variety of mechanical analysismethods such as structural conceptual design, multi-model envelope design and finite element numerical analysis were usedto achieve the given performance design goals of the structure. Two checking working conditions of structural resistance toprogressive collapse under accidental load and structural floor comfort under pedestrian load were added to ensure that thegiant truss can meet the requirements of ultimate state of bearing capacity and ultimate state of normal use.

Keywords: giant arc-shaped truss; out-of-plane stability; performance-based design; progressive collapse resistance;floor comfort

∗江蘇省重點(diǎn)研發(fā)計(jì)劃資助項(xiàng)目(BE2022606).

第一作者:王志明,博士,高級(jí)工程師,主要從事結(jié)構(gòu)設(shè)計(jì),擅長(zhǎng)高層和大跨鋼結(jié)構(gòu)設(shè)計(jì),Email:81989484@ qq. com.

[引用本文] 王志明,曹榮,孫遜,等. 南京揚(yáng)子江智慧中心巨型弧狀立體桁架設(shè)計(jì)[ J]. 建筑結(jié)構(gòu),2023,53(2):42-49,54. WANG Zhiming,CAO Rong,SUN Xun,et al. Design of giant arc-shaped three-dimensional truss for NanjingYangtze River Wisdom Center[J]. Building Structure,2023,53(2):42-49,54.