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(西安建筑科技大學(xué)土木工程學(xué)院，710055)

［提要］引用國(guó)外最新的試驗(yàn)研究，對(duì)薄壁工字形鋼梁在小片荷載偏心作用下的承載力問題進(jìn)行了研究。數(shù)值分析結(jié)果與國(guó)外最新試驗(yàn)數(shù)據(jù)吻合良好。研究表明，影響薄壁工字形鋼梁在小片荷載偏心作用下承載力的主要參數(shù)是腹板的厚度、屈服強(qiáng)度、荷載偏心值以及荷載作用長(zhǎng)度，對(duì)這些參數(shù)都進(jìn)行了定量的分析。基于國(guó)外已有的關(guān)于中心加載情況下的半經(jīng)驗(yàn)公式和數(shù)值分析結(jié)果，提出了適用于荷載偏心值在0～15mm之間的承載力計(jì)算公式，建議公式與試驗(yàn)數(shù)據(jù)、數(shù)值分析結(jié)果相比較，表明建議公式是合理而偏于安全的。

［關(guān)鍵詞］薄壁工字形鋼梁；小片荷載偏心作用；數(shù)值分析結(jié)果

Load Carrying Capacity of Thin-walled Steel I-girders Subjected to Eccentric Patch Loading/Guo Peng, Guo Chengxi, He Baokang (Xi’an University of Architecture and Technology, Xi’an 710055, China)

Abstract:Based on the latest experimental study, the load carrying capacity of the thin-walled steel I-girders subjected to eccentric patch loading has been analyzed. The numerical calculating results agree well with the test data. The parameters affecting the load carrying capacity of the thin-walled steel I-girders subjected to eccentric patch loading are researched through a series of numerical test specimens. The parameters, which play an important role in the load carrying capacity, are the web thickness, the yielding strength, the eccentric value of the loading and the applied length of the loading. A new predicting expression is proposed to determine the load carrying capacity of the thin-walled steel I-girders subjected to eccentric patch loading. The comparison of the calculating results obtained from the new predicting expression with the test results and the numerical calculating results show that the new proposed expression is reasonable and conservative.

Keywords:thin-walled steel I-girders; eccentric patch loading; numerical calculating results