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   孫玉萍，  吳國(guó)棟
   （蘭州理工大學(xué)土木工程學(xué)院，蘭州 730050）

[摘要] 采用ABAQUS軟件將翼緣加強(qiáng)狗骨型節(jié)點(diǎn)與普通型節(jié)點(diǎn)、狗骨型節(jié)點(diǎn)、腹板開孔型節(jié)點(diǎn)進(jìn)行對(duì)比分析，研究單調(diào)荷載作用下的受力性能和低周循環(huán)荷載作用下的抗震性能。結(jié)果表明：翼緣加強(qiáng)狗骨型節(jié)點(diǎn)在塑性鉸外移的同時(shí)承載力比狗骨型節(jié)點(diǎn)和腹板開孔型節(jié)點(diǎn)高，梁端翼緣焊縫處應(yīng)力比腹板開孔型節(jié)點(diǎn)與狗骨型節(jié)點(diǎn)降低更為明顯，比普通型節(jié)點(diǎn)降低約90/0，能有效地緩解梁柱節(jié)點(diǎn)處的應(yīng)力集中，減小因焊縫質(zhì)量不高引起的脆性斷裂概率，延性系數(shù)比普通節(jié)點(diǎn)、狗骨型節(jié)點(diǎn)、腹板開孔型節(jié)點(diǎn)分別高27%，6.5%，14.3%，在保證承載力下降較小的情況下具有更好的變形能力，在實(shí)際工程中值得推廣。
[關(guān)鍵詞] 節(jié)點(diǎn)；受力性能；應(yīng)力集中；塑性鉸；抗震性能；延性系數(shù)
中圖分類號(hào)：TU391    文獻(xiàn)標(biāo)識(shí)碼：A  文章編號(hào)：1002-848X(2012) Sl-0721-05

Comparative study on mechanical behavior of modified connections of steel frame
Sun Yuping, Wu Guodong
( Department of Civil Engineering, Lanzhou Technological University, Lanzhou 730050, China)

Abstract: Using ABAQUS,widen flange-dog bone connection( WFD) ,ordinary connection( BASE), reduced beam section connection( RBS)  and opening in beam web connection( OBW) were compared. The mechanical properties under a monotonic loading and the aseismic behaviour under a cyclic loading of four connections were researched. Numerical analyses indicate that the bearing capacity of WFD connection is better than RBS connection and OBW connection while plastic lunge shift-away also. The stress in WFD connection weld area decreased greater than OBW connection and RBS connection, and lower than BASE connection 9%. The WFD connection can ease the stress concentration and reduce the probability of brittle fracture caused by bad welding quality. The ductility coefficient of WFD connection is greater than BASE connection, RBS connection and OBW connection 27%, 6.5%, 14.3% respectively, and has better deformability while bearing capacity reduced less. In practical engineering, WFD connection is worth promoting.
Keywords: connection; mechanical behaviour; stress concentration; plastic hinge; aseismic behaviour; ductility coefficient