港口后方物流园区规划研究

以一拟建的大型集装箱码头为主的港口为例,对包括临港工业区在内的集装箱码头后方物流园区进行了规划研究。分析了其物流的组成、流向和流量,对物流园区内的7大功能区域的用地面积进行了分析估算,结合港口的地理位置,提出了2个较为典型的总体平面布置方案,并进行了比选分析。     

北京市公共汽车票价之调研

优先发展公共交通是解决北京市交通问题的既定方略和必然要求。依据调查资料,本文选取票价作为关键因子,对比出租汽车的运营情况,进行统计学分析,得出北京市公共汽车单程收入相对较高的结论,并探讨在此情况之下仍然亏损的原因。在综合考虑企业经济效益和社会效益的基础上,提出了建立更加合理的票价体系、做好配套设施建设和改革等政策建议,为有关企业和部门实施“公交优先”战略提供一定的决策依据。     

上海长江大桥工程墩柱分节预制安装施工技术

上海长江大桥深水区非通航孔桥墩的墩柱采用分节预制安装施工技术取代传统的现浇施工工艺,为国内首创。文章介绍了墩柱分节预制、陆上立式运输、分节安装和现浇湿接头混凝土施工工艺。工程结果表明,该工艺安全、优质、高效,为我国江、海上桥梁墩柱施工开辟了一条新途径。     

深水气力提升装置输送效率分析模型

为设计和优化深水气力提升装置并估算其输送效率，基于连续性方程及冲量方程，耦合能量方程，并考虑气体体积膨胀和截面含气率变化，建立了一种通用的气力提升三相流装置的理论分析模型。该分析模型的计算结果与文献试验数据的吻合性较好。利用本文模型针对工程实例的计算分析表明，增大输送管径可有效提高提升系统的输送功效。     

梁板式高桩码头结构计算模型比选

通过计算比较分析,讨论了梁板式高桩码头结构计算的各种计算模型的适用性。分别以某15万t级集装箱高桩码头的结构段和单个排架段结构为研究对象,建立了梁板单元、实体单元和等效桩基实体单元的有限元分析模型,通过对控制工况进行计算比较,讨论了各种计算模型的计算效率、特点和适用性。计算码头桩基内力、横纵梁内力、沉降变形量时,可采用梁板单元结构段模型,作为近似,也可采用现设计规范推荐的投影梁板单元排架结构模型。     

Ultimate strength analysis of composite stiffened panels based on multi-scale approach北大核心CSCD

［Objectives］As composite materials have varied internal structures, an in-depth analysis of the damage mechanisms of their component materials can provide a research foundation for the ultimate strength analysis of composite stiffened panels. ［Methods］The microscopic, mesoscopic and macroscopic mechanical analyses of marine glass fiber reinforced plastic (GFRP) composite stiffened panels are carried out using a multi-scale approach. Microscopic and mesoscopic representative volume element (RVE) models of chopped strand mat (CSM) and woven roving (WR) materials are established, and the macroscopic equivalent stiffness is obtained by homogenizing the RVE models. The ABAQUS VUMAT subroutine is used to code the progressive damage evolution model of the composite materials to derive the damage evolution mechanism of the microscopic and mesoscopic models respectively. The equivalent strength of macroscopic laminates is also obtained. ［Results］The multi-scale approach can be used to accurately evaluate the macroscopic mechanical properties of composite materials, and the ultimate strength of composite stiffened panels is mainly determined by fiber bundle failure. ［Conclusions］The obtained macroscopic material parameters can be used to calculate the ultimate strength of composite stiffened panels, while the parametric study of the mesomechanics of composite materials can provide an analysis tool for investigating the influence of material processing technology. © 2023 Chinese Journal of Ship Research. All rights reserved.