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（1 西安建筑科技大學(xué)土木工程學(xué)院， 西安 710055； 2 陜西省建筑科學(xué)研究院， 西安 710082）
［摘要］在鋼結(jié)構(gòu)設(shè)計中應(yīng)考慮軸心受拉平板不完全連接時產(chǎn)生的剪力滯后效應(yīng)，國外規(guī)范對此做出了折減截面面積的相關(guān)規(guī)定，但是折減程度偏大，直接引入我國規(guī)范使用稍顯不經(jīng)濟。通過有限元軟件ABAQUS對國外相關(guān)試驗進行了模擬，驗證了模型的正確性，并使用該模型分析了焊縫長度、板寬度等參數(shù)對剪力滯后的影響，分析了考慮剪力滯后效應(yīng)和未考慮剪力滯后效應(yīng)時關(guān)鍵截面應(yīng)力分布情況。通過通用屈服彎矩法對桿件的恢復(fù)力曲線進行處理，得到了桿件屈服荷載，確定了面積折減系數(shù)。將有限元計算得到的折減系數(shù)和國外規(guī)范及征求意見稿進行對比和分析，最后給出了該折減系數(shù)的取值建議。
［關(guān)鍵詞］軸心受拉; 剪力滯后; 凈截面; 折減系數(shù)
中圖分類號：TU202，TU391 文獻標(biāo)識碼：A 文章編號：1002-848X(2014)09-0043-05
Analysis on shear lag effect of axial tension plate with side fillet welding connection
Luo Zheng1, Lei Siwei1, Zhang Fengliang2
(1 School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China; 2 Shaanxi Institute of Architecture Science, Xi’an 710082, China)
Abstract: In the steel structure design, the shear lag effect should be considered in axial tension plate with incomplete connection. Foreign codes have made relevant provision which is about reduction cross section area, but reduction degree is too large. It is slightly not economic if the foreign code is directly introduced into Chinese code. Through the finite element software ABAQUS, foreign related test was simulated to verify the accuracy of model, and the model was used to analyze the effect of weld length, plate width, etc. on the shear lag. The critical cross section stress distribution was analyzed by considering and not considering the shear lag effect. Through the general yield bending moment method, restoring force curves of member processing were analyzed to obtain the yield load. Then area reduction factor was determined. Compared FEM result with foreign code and Chinese code draft，the suggested values of the reduction coefficients were given.
Keywords: axial tension; shear lag; net area; reduction coefficient
作者簡介：羅崢，碩士研究生，Email：luozheng0130@gmail.com。
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