Free Vibration and Modal Analysis of Tower Crane Using

Abstract—This paper presents finite element free vibration and modal analysis of a typical tower crane frame using SAP2000 and ANSYS. Three-dimensional beam elements and bar elements are employed for vertical and horizontal frames as well as the tie rods, respectively, to build up the numerical model. Then numerical example is considered and the first leading twelve fundamental frequencies and periods of the tower crane obtained by SAP2000 and ANSYS, respectively, are obtained. The associated modes obtained from these two softwares are also resented and discussed. The discrepancies between these free vibration characteristics of the first nine modes calculated from different analysis programs are small than 10 %, and thus can be accepted in the sense of engineering application. There exist additional vibration modes with high frequency predicted by different software