(西安建筑科技大学土木工程学院，710055)

［提要］引用国外最新的试验研究，对薄壁工字形钢梁在小片荷载偏心作用下的承载力问题进行了研究。数值分析结果与国外最新试验数据吻合良好。研究表明，影响薄壁工字形钢梁在小片荷载偏心作用下承载力的主要参数是腹板的厚度、屈服强度、荷载偏心值以及荷载作用长度，对这些参数都进行了定量的分析。基于国外已有的关于中心加载情况下的半经验公式和数值分析结果，提出了适用于荷载偏心值在0～15mm之间的承载力计算公式，建议公式与试验数据、数值分析结果相比较，表明建议公式是合理而偏于安全的。

［关键词］薄壁工字形钢梁；小片荷载偏心作用；数值分析结果

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