偏心梁和非偏心梁建模方法合理性分析

摘要

为了验证《结构共同规范》、《双壳油船规范》规定的非偏心梁和CSR散货船规范规定的偏心梁属性定义的合理性,采用一加筋板模型,利用MSC.Patran/Nastran对比在复杂弯曲状态下板梁组合模型有限元收敛解与同量级全板元位移及应力结果,发现偏心梁模型结果与全板元相对误差能够满足工程需求,非偏心梁不能满足工程需求.对比一条散货船和一条双壳油船发现,偏心梁与非偏心梁应力差距最大可达100.70 MPa,与普通钢的屈服极限235比值为42.85%.偏心梁模型计算结果更加符合实际,验证了CSR-H摒弃非偏心梁的合理性.%In order to validate the rationality of the in-plane beam in common structural rules (CSR) for double hull oil tankers and the eccentric beam in CSR for bulk carriers, a stiffened plate model was established in MSC Patran/Nastran.In the complex bending state, the convergence of displacement and stress in beam-plates combination model and the data in full plate element with the same mesh size was contrasted.It was found that the differences between the eccentric beam model and the full plate element are small, which can meet the engineering requirements, while the in-plane beam model can't meet the engineering requirements.Through a comparative analysis of a bulk carrier and a double hull tanker, the largest gap of the in-plane beam and full plate model can reach 100.70 MPa.So the eccentric beam modeling method is more reasonable.