Closure to “Analysis of Shear Lag Anomaly in Box Girders” by S.C. Lee, C.H. Yoo., and D.Y. Yoon

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In this article, the original researchers (Lee et al) reply to a commentary on their study of lag anomaly in box girders. These authors originally reported that the source of the is positive lag, positive lag creates negative lag through the or the compatibility requirement, and the origin or negative lag is positive lag. The commentary authors demonstrate why these conclusions are wrong. The commentary contends that positive lag and negative lag are caused by the secondary stresses, when the warping of the flange is partially or fully restrained; the secondary stresses result from the continuity requirement of the longitudinal displacements (therefore the term shear lag-aftereffect is needless); and both the positive lag and the negative lag are independent phenomena. In this reply, the original authors (Lee at al) defend their finite-element models, their analysis results, and the methodology used in their study. The researchers restate that their paper dealt with the wide flanges of practical cantilever box girders subjected to various types of lateral loading, and assumed that the mechanical properties are constant in the flanges. The researchers stand by their method and the tracing of the source of negative lag found in practical box flanges made of homogeneous material like structural steel.