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（浙江省建筑設(shè)計(jì)研究院， 杭州 310006）

［摘要］箱形斜交網(wǎng)格節(jié)點(diǎn)由多根箱形斜柱構(gòu)件和水平鋼梁匯交于節(jié)點(diǎn)板而成，其板件組成、受力變形及制作工藝均較為復(fù)雜?？紤]采用基于等效面積設(shè)計(jì)原則來(lái)保證節(jié)點(diǎn)承載力大于進(jìn)入節(jié)點(diǎn)的斜柱構(gòu)件承載力之和，即“強(qiáng)節(jié)點(diǎn)、弱桿件”；針對(duì)典型的中部平面斜交節(jié)點(diǎn)和角部空間斜交節(jié)點(diǎn)，通過(guò)ANSYS有限元分析研究其正常工作時(shí)的應(yīng)力變形和極限荷載下的破壞效應(yīng)；同時(shí)對(duì)斜交節(jié)點(diǎn)的板件焊接工藝和內(nèi)部混凝土澆灌工藝進(jìn)行了研究。結(jié)果表明：大震作用下正常工作時(shí)，斜交節(jié)點(diǎn)的整體平均應(yīng)力水平小于250MPa，保證了節(jié)點(diǎn)核心區(qū)在大震作用下不屈服，構(gòu)件角部由于應(yīng)力集中局部進(jìn)入塑性；極限荷載作用下，整體呈現(xiàn)斜柱構(gòu)件塑性屈曲破壞效應(yīng)，屈曲后斜交節(jié)點(diǎn)無(wú)法繼續(xù)承載。

［關(guān)鍵詞］斜交節(jié)點(diǎn)； 等效面積； 塑性屈曲； 極限荷載； 強(qiáng)節(jié)點(diǎn)、弱桿件

中圖分類號(hào)：TU355文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)10-0046-05

Finite element analysis and application of diagonal frame joint in super high-rise steel structure

Wang Zhen, Yang Xuelin, Feng Yongwei, Qu Haochuan

(Zhejiang Province Institute of Architectural Design and Research, Hangzhou 310006, China)

Abstract:The box-typed diagonal frame joint is composed of some box-typed inclined column members and horizontal steel beams converged on the joint plates. The composition of the plates, the stress-deformation and the production process are all complex. The design of the principle of equivalent area was considered to ensure that the bearing capacity of the joint is greater than the sum of the bearing capacity of the inclined column members, which fulfills the design principle of strong joint and weak member. For the typical joints of the middle plane diagonal joint and the corner space diagonal joint, the finite element analysis software ANSYS was used to study the stress and deformation under the normal working and the failure effect under the ultimate load. Then, the welding process and the internal concrete pouring process of the diagonal joint were studied. Results show that the overall average stress level of the diagonal joint is less than 250MPa under case of the normal working under  rare earthquake, ensuring that the core region of the joint will not yield under  rare earthquake and the corner of intersecting plates enter local plastic state due to the stress concentration effect. Under the ultimate load, the plastic buckling failure effect of the diagonal column member appears as a whole, and the diagonal joint cannot continue to bear the load after buckling.

Keywords:diagonal frame joint; equivalent area; plastic buckling; ultimate load; strong joint and weak member

*浙江省建設(shè)科研項(xiàng)目(2015K11)。

作者簡(jiǎn)介：王震，博士，高級(jí)工程師，Email: wzjggc@163.com。