884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

方鋼管混凝土柱-型鋼梁節(jié)點(diǎn)斷裂分析及延性節(jié)點(diǎn)研究*

王萬禎1, 2，   楊保證2，   顧   強(qiáng)3，   黃俊偉2

(1 寧波大學(xué)建筑工程與環(huán)境學(xué)院，寧波 315211；2 蘭州理工大學(xué)土木工程學(xué)院，蘭州 730050；3 蘇州科技學(xué)院土木工程學(xué)院，蘇州 215011)

［摘要］運(yùn)用結(jié)構(gòu)鋼橢球面屈服模型和橢球面斷裂模型，對梁柱節(jié)點(diǎn)試驗(yàn)進(jìn)行了數(shù)值模擬分析，得出了等效考慮焊接殘余應(yīng)力和焊接缺陷的對接焊縫斷裂因子CI的修正系數(shù)k。對方鋼管混凝土柱-型鋼梁節(jié)點(diǎn)進(jìn)行了基于橢球面強(qiáng)度模型的數(shù)值模擬和斷裂分析，結(jié)果顯示：柱對梁的強(qiáng)約束使對接焊縫處應(yīng)力集中嚴(yán)重，該處的等效應(yīng)力和平均應(yīng)力幅值均較高，當(dāng)對接焊縫應(yīng)力場函數(shù)達(dá)到建議的橢球面斷裂準(zhǔn)則臨界值時(shí)，該處發(fā)生斷裂。以結(jié)構(gòu)鋼橢球面斷裂模型為評判依據(jù)，提出了降低對接焊縫等效應(yīng)力和平均應(yīng)力幅值（即提高節(jié)點(diǎn)延性）的構(gòu)造建議。

［關(guān)鍵詞］鋼管混凝土柱-型鋼梁節(jié)點(diǎn)；橢球面屈服模型；橢球面斷裂模型；等效應(yīng)力；平均應(yīng)力；斷裂

中圖分類號：TU391文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2011)01-0026-04

Fracture analysis and ductile joints of concrete filled square

steel tube column-steel beam connections

Wang Wanzhen1, 2, Yang Baozheng2, Gu Qiang3, Huang Junwei2

( 1 Faculty of Architectural, Civil Engineering and Environment, Ningbo University, Ningbo 315211,China;

2 School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China;

3 School of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215011, China)

Abstract:Using an elliptical yield model together with an elliptical fracture model, the correctional coefficient of fracture index was obtained to equivalently calculate the effects of residual stress and disfigurement through numerical simulation and fracture analysis of beam-column connection tests. The concrete filled square steel tube column-steel beam connections were numerical simulated and analyzed based on the elliptical yield model and the elliptical fracture model. Numerical results show that the strong constraint of column on the beam leads to high stress concentration in beam flange butt weld, where the equivalent stress and the average stress amplitude are high. The butt weld fractured when the stress function reached the ellipsoidal fracture critical value. Using the ellipsoidal fracture criterion for evaluation, the details of connection were proposed to reduce equivalent stress and average stress amplitude in butt weld.

Keywords:concrete filled square steel tube column-steel beam connection; elliptical yield model; elliptical fracture model; equivalent stress; average stress; fracture

*國家自然科學(xué)基金項(xiàng)目(50808098)，寧波市自然科學(xué)基金(2010A610082)，寧波大學(xué)科研項(xiàng)目(XKL100)。

作者簡介：王萬禎，博士，副教授， Email：wangwanzhen1975@sina.com。

參考文獻(xiàn)

［1］HAMBURGER. Moment-frame connection qualification criteria for seismic design ［R］. Fourth International Workshop on Connections in Steel Structures, Roanoke,VA, 2000.

［2］CALADO L, MELE E. Cyclic behavior of steel beam-to-column joints: governing parameters of welded and bolted connections ［R］. Fourth International Workshop on Connections in Steel Structures, Roanoke,VA, 2000.

［3］PARK J W, KANG S M, YANG S C. Experimental studies of wide flange beam to square concrete-filled tube column joints with stiffening plates around the column ［J］. Journal of Structural Engineering, 2005, 131(12): 1866-1876.

［4］王萬禎. 高強(qiáng)鋼廣義屈服和破壞理論［J］. 固體力學(xué)學(xué)報(bào)，2007，28(4)：389-392.

［5］王萬禎. 結(jié)構(gòu)鋼開裂準(zhǔn)則及斷裂試驗(yàn)分析［J］. 工程力學(xué)，2008，25(5)：27-31.

［6］王萬禎. 鋁合金宏觀斷裂準(zhǔn)則［J］. 西安交通大學(xué)學(xué)報(bào)，2007，41(5)：616-620.

［7］黃俊偉，王萬禎，楊俊曉. 基于廣義強(qiáng)度模型的空心球節(jié)點(diǎn)承載力分析［J］. 甘肅科學(xué)學(xué)報(bào)，2009，21(3)：126-130.

［8］李波，楊慶山. 腹板開孔型鋼框架梁柱節(jié)點(diǎn)抗震性能試驗(yàn)研究［J］. 哈爾濱工業(yè)大學(xué)學(xué)報(bào)，2006，38(8)：1303-1305.

［9］楊慶山，李波，楊娜. 腹板開圓孔鋼框架梁柱節(jié)點(diǎn)的性能研究［J］. 工程力學(xué)，2007，24 (9)：111-121.

［10］FEMA-350. Recommended seismic design criteria for new steel moment-frame buildings［S］. 2000.

［11］陳惠發(fā). 土木工程材料的本構(gòu)方程［M］. 余天慶，王勛文，劉再華，譯.武漢：華中科技大學(xué)出版社，2001.

［12］SUSANTHA K A S, GE HANBIN, USAMI TSAMI. Uniaxial stress-strain relationship of concrete confined by various shaped steel tubes ［J］. Engineering Structures, 2001, 23（10）:1331-1347.

［13］韓林海. 鋼管混凝土結(jié)構(gòu)——理論與實(shí)踐［M］.北京：科學(xué)出版社，2004.

［14］鐘善桐. 鋼管混凝土結(jié)構(gòu) ［M］. 3版. 北京：清華大學(xué)出版社，2003.

［15］JGJ101—96 建筑抗震試驗(yàn)方法規(guī)程［S］. 北京：中國建筑工業(yè)出版社，1997.