The Effect of Rigid-soft Legs on Mid-span Deflection in Gantry Cranes

ZHANG Da-peng, CHENG Wen-ming, XIAO Wu-neng


In practical application, when the test weight is insufficient, it is urgent to solve the safety and reliability problems of crane structure. The deflection value is one of the key inspection indices of crane girder under rated loading in overall test. Therefore, it is very important that the influence of structure parameters on the mid-span deflection is quantified. For large-span and heavy-duty gantry cranes, the effect of rigid-soft legs on mid-span deflection was not considered in the past. So a mathematical model was established for universal large-span and heavy-duty gantry cranes. Considering the coupling effect of the bending moment of girder and legs, the analytical solution was derived and obtained on the basis of the variational principle. Then, the experimental model was designed and experiments were performed on the WEW-600B type testing machine. The experiment data show that the analytical solution of the gantry-frame structure deflection is more accurate than the pre-existing calculation method, which provides an analytical tool for the design and inspection of gantry structures.



Keywords: gantry crane,  deflection,  analytical solution,  structural stiffness

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GUO Jian-sheng. Investigate on the stiffness performance of frame-structure in container gantry crane [J]. Loading and Unloading of Port. 2001. 137(3): 11-13. (In Chinese)

ZHOU Yi-qing. ZHANG Shan-yuan. Solitary waves and chaotic behavior in large-deflect ion beam [J]. Journal of North University of China: Natural Science Edition. 2012.33(6): 613

YE Lie-ping. LIN Xu-chuan. QU Zhe. et al. Evaluating method of element importance of structural system based on generalized structural stiffness [J]. Journal of Architecture and Civil Engineering. 2010.27( 1): 1 — 7. (In Chinese)

CHEN Yu-ji. LUO Qi-zhi. LIU Xiao-jie. Mechanics analysis of thin-walled box continuous girder with variable cross-sections in considering influence of large deflection and shear lag [J]. J Cent South Univ; Science and Technology. 2008. 39 (4): 845 — 819. (In Chinese)

CHEN Chang-hua. ZHANG Yuan-hai. Influence of shear lag warping displacement functions on deflection of box girders [J]. Journal of Lanzhou Jiaotong University. 2010. 29(4): 91— 94. (In Chinese)

ZHANG Yi-min. HE Xiang-dong. LIU Qiao-ling. et al. Stiffness reliability-based sensitivity analysis of beam structurewith arbitrary distribution parameters [J]. Chinese Journal of Computational Mechanics. 2007,21(6): 785 — 790. (In Chinese)

ZHENG Min. LIANG Shu-guo. XIONG Tie-hua. Study on the reliability-based wind resistant optimization of transmission line lowers [J]. Journal of Hunan University: Natural Sciences Edition.2014 .41(6) :35 —42. (In Chinese)

TANG He-sheng. SU Yu. XUE Song-tao. et al. A Method of reliability design optimization using evidence theory and differential evolution [J]. Journal of Hunan University: Natural Sciences Edition.2014 .41(4) :33_38. (In Chinese)

HOLST C. BURGHOF M. KUHLMANN H. Modeling the beam deflection of a gantry crane under load[J]. Journal of Surveying Engineering. ASCE.2014.140:52—59.

HOLST C. ELING C. KUHLMANN H. Automatic optimization of height network configurations for detection of surface deformations [J]. J Appl Geod. 2013. 7(2): 103—113.

LEE HM, PARK H S. Gage-free stress estimation of a beamlike structure based on terrestrial laser scanning [J]. Com put Aided Civ Infr Eng. 2011. 26(8):617-658.

CASTILLO E. MINGUEZ R. CASTILLO C. Sensitivity a-nalysis in optimization and reliability problems [J] . Reliab Eng Syst Saf. 2008. 93( 12): 1788- 1800.


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