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为适应高层建筑施工的需要,北京、上海、广州等地相继设计和试制了新型的自升塔式起重机,这种起重机的塔身可以自行接高,起重高度较大,如北京的 QT4-10型及上海的ZT120型自升塔式起重机,最大起重高度可达160米。由于起重高度大,在设计计算起重机金属结构及稳定性时,风荷载便成了一个主要的因素,据有关资料介绍。由于风力引起的倾复力矩往往超过最大起重静力矩,起重高度越大,风荷载的影响也就越大。所以对风荷载计算方法的探讨,对保证起重机的安全可靠及合理使用钢材均有很大意义。
In order to meet the needs of high-rise building construction, Beijing, Shanghai, Guangzhou and other places have been designed and trial-produced a new type of jack-up crane, the tower crane can pick up their own high lifting height, such as Beijing’s QT4- 10 and Shanghai ZT120 jack-up cranes, the maximum lifting height of up to 160 meters. Due to the high lifting height, the wind load has become a major factor in the design and calculation of the crane’s metal structure and stability. According to the information presented. As the wind-induced overturning moment often exceeds the maximum hoisting static moment, the greater the lifting height, the greater the impact of the wind load. Therefore, the discussion of wind load calculation method is of great significance to ensure the safe and reliable use of cranes and the rational use of steel.