29000吨散货船槽型舱壁极限承载能力分析

Ultimate Load-Bearing Capacity Analysis of Corrugated Bulkhead of 29000 DWT Bulk Carrier

本文应用NASTRAN程序分析了29000吨散货船槽型舱壁的极限承载能力。结果表明，船体破损后槽型舱壁在海水压力和货物压力作用下工作类似于梁的性质。从偏于安全考虑，可取舱壁的极限承载能力为相应于弯矩一载荷曲线折转点的载荷。按这一定义，29000吨散货船槽型舱壁的极限承载能力为最大弹性承载能力的1．6倍，这为评价现有散货船的舱壁强度，提供了依据。

篢he ultimate load-bearing capacity of 29000 dwt bulk carrier's corrugated bulkhead is analyzed by using NASTRAN program. The results indicate that the corrugated bulkhead works as a beam under pressure of sea water and cargo due to hull damage. Within the extent of elasticity. the bending moment of bulkhead section is linear with load on it. When the flange of bulkhead enters into yielding state, nonlinearity appears between them. The nonlinearity becomes apparent with increase of acting load. When load reaches 1. 6 times of maxium elasticity load,the down end section of bulkhead appears“unloading”and bending moment curves start turning. When load is up to 1. 9 times of maxium elasticity load, the bulkhead loses loadsebearing capacity and collapes. On side of safety the corresponding load to turning point of bending moment curves may be taken as ultimate load-bearing capacity. According to this definition, ultimate load-bearing capacity of bulkhead of 29000 dwt bulk carrier is 1. 6 times of max. elasticity loacl, which gives foundation for comment on corrugated bulkhead strength of existing bulk carriers.