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1 引言固定式塔机由于底架简单、支承稳定,得到了越来越广泛的应用。底部的四根斜撑杆(图 1)使塔身的危险截面由根部平面移到斜撑上支承面,能减少截面内力,改善底架受力状态,又缩短了塔身的计算长度。显然,对塔身的强度、整体稳定性都十分有利。斜撑上支点高度的选择,将直接影响塔身的强度、稳定性和斜撑的稳定性。因此,有必要
1 Introduction The fixed tower crane has been more and more widely used due to its simple chassis and stable support. The four diagonal struts at the bottom (Fig. 1) allow the dangerous cross section of the tower to move from the root plane to the support surface on the struts, which reduces the internal forces in the section, improves the stress on the undercarriage, and shortens the calculated length of the tower. Obviously, it is very beneficial to the tower’s strength and overall stability. The choice of the height of the fulcrum on the strut will directly affect the strength, stability and stability of the strut. Therefore, it is necessary