关于船舶规范中计算载荷的分析

ANALYSIS OF DESIGN LOAD IN SHIP SPECIFICATION

本文利用非线性切片理论，以两条不同类型的船舶为例，具体分析了现行规范中关于波浪弯矩、砰击振动弯矩以及弯矩迭加计算时存在的一些问题；指出了在确定计算载荷时应当计及船舶在波浪中的失速，所谓的谐振波不一定就是最危险的规则子波，按动量冲击理论计算以底部砰击为主的船舶是不合适的，不应把波浪弯矩和砰击报动弯矩的最大值简单相加来确定合成弯矩。

By using the nonlinear strip theory and taking two ships of different types as examples several problems existing in the present ship specification, such as the calculation of wave bending moment and slamming vibration bending moment, as well as the superposition of bending moments are discussed in detail. The paper indicates that the speed losses of ships in waves should be considered in the determination of design load, so called harmonic vibration wave need not be the most dangerous regular wave, it is not proper to calculate the bottom slamming of ships which have apparent flat bottoms according to the momentum slamming theory, and the total bending moment should not be obtained by simply adding the maximum values of wave bending moment to the slamming vibration bending moment.