3 000 t·h-1桥式抓斗卸船机结构局部稳定性计算
Calculation of Local Stability of 3 000 t·h-1 Bridge Grab Ship Unloader Structure
李明昊1
作者信息
- 1. 曹妃甸港矿石码头股份有限公司,唐山 063200
- 折叠
摘要
稳定性是结构正常工作的前提,以 3 000 t·h-1 桥式抓斗卸船机作为分析对象,采用理论计算的方法对其局部稳定性展开计算.该型卸船机主要由臂架、塔架腿、门架腿构成,这 3 部分的局部稳定性直接决定了整个卸船机的稳定性,因此需要对其盖板和腹板展开计算.首先根据结构受载、板壳参数计算板上边应力、板下边应力、板的剪切应力和复合应力,然后计算材料的等效临界压应力及等效临界复合应力,再求得各结构板件的材料利用率,最后根据起重机设计规范对计算结果进行评定.结果表明,板上最大边应力和复合应力分别为 158 MPa和 166.32 MPa,此时材料的等效临界压应力为 211.77 MPa、等效临界复合应力为188.36 MPa;材料最大利用率为 0.88,满足规范要求.此计算方法能够为卸船机设计和优化提供基础数据,也能够为卸船机及同类结构件的稳定性分析提供一定的借鉴和参考.
Abstract
The stability is the premise of the normal operation of the structure.Taking the 3 000 t·h-1 bridge grab ship unloader as the analysis object,the local stability is calculated by theoretical calculation method.The ship unloader is mainly composed of boom,tower leg and portal leg.The local stability of these three parts directly determines the stability of the whole ship unloader,so it is necessary to calculate its cover plate and web plate.First of all,the upper plate stress,lower plate stress,plate shear stress and composite stress are calculated according to the load and shell parameters of the structure,and then the equivalent critical compressive stress and equivalent critical composite stress of the material are calculated,and then the material utilization rate of each structure plate is obtained.Finally,the calculation results are evaluated by the crane design code.The results show that the maximum edge stress and composite stress on the plate are 158 MPa and 166.32 MPa respectively,and the equivalent critical compressive stress is 211.77 MPa and the equivalent critical composite stress is 188.36 MPa.The maximum utilization rate of the material is 0.88,which meets the requirements of the specification.This calculation method can provide basic data for the design and optimization of ship unloader,and can also provide a certain reference for the stability analysis of ship unloader and similar structural parts.
关键词
桥式抓斗卸船机/局部稳定性/材料利用率Key words
bridge type grab ship unloader/local stability/material utilization rate引用本文复制引用
出版年
2024
NETL
NSTL
万方数据