长三角滨海工业区竖向规划方法研究

该文针对长三角滨海区域地势平坦低洼、河网密布、防洪排涝标准偏低的现状,在市政详细规划阶段对新建工业区竖向规划方法进行研究,分别考虑了雨水排除高程要求、蓝线和绿线高程要求以及道路、桥梁、场地高程要求。市政详细规划阶段的竖向规划是在控制性详细规划基础上对用地高程做更细致的控制,其对于后续设计工作和项目的分期建设、合理控制投资均具有重要的意义。     

大跨简支系杆拱桥非线性稳定性

宁杭高速公路南河大桥为主桥130m跨径简支下承式钢管混凝土系杆拱桥。在考虑了拱桥非线性稳定性影响因素基础上,利用有限元ANSYS结构分析程序,建立了拱桥结构稳定性分析空间有限元模型,给出了该桥常见的失稳屈曲模态,研究了大跨简支系杆拱桥的非线性稳定性求解策略,并对南河大桥简支钢管混凝土系杆拱桥进行了非线性稳定性计算。结果表明,钢管混凝土拱脚处的拱肋首先形成塑性铰,破坏时的极限荷载达到正常使用荷载的3．50倍,满足稳定性要求。     

驾驶员道路认知特性模型

为了提供驾驶员车速控制模式建模所需的试验数据依据和评语隶属函数,采用模糊集合原理和模糊统计试验分析方法,研究了车辆驾驶员对道路结构和交通环境因素的安全性认知与评价思维过程。在实测226处国道二级公路典型路段道路结构数据基础上,根据对131处路段样本评价试验后得到的1 785组有效“专家”认知评语数据,得出了基于0.2-截集的各认知评语非零集和基于0.8-截集的各认知评语确定集,建立了车辆驾驶员对国道二级公路道路结构和交通环境要素的安全性模糊评价评语模糊子集和模拟计算模型。     

Wave load computation in direct strength analysis of semi-submersible platform structures

A wave load computation approach in direct strength analysis of semi-submersible platform structures was presented in this paper. Considering the differences in shape of pontoon, column and beam, the combination of accumulative chord length cubic parameter spline theory and analytic method was adopted for generating the wet surface mesh of platform. The hydrodynamic coefficients of platform were calculated by the three-dimensional potential flow theory of the linear hydrodynamic problem for platform with low forward speed. The equation of platform motions was established and solved in frequency domain, and the responses of wave-induced loads on the platform can be obtained. With the interpolation method being utilized, the pressure loads on shell elements for finite element analysis(FEA) were converted from those on the hydrodynamic computation mesh, which pave the basis for FEA with commercial software. A computer program based on this method has been developed ,and a calculation example of semi-submersible platform was illustrated. Analysis results show that this method is a satisfying approach of wave loads computation for this kind of platform.     

不同边坡河道交汇处岸线的连接设计及放样

两条边坡不同的河道交汇时,中心线可用圆弧线连接。但由于边坡不同,故岸线等不可能在中心圆弧线切点的同一截面处用较小半径的同心圆弧线来连接。为保证交汇处河道均匀渐变,可设计椭圆线连接两河岸线。用数介法可得椭圆的圆心及长、短半径,用CAD可绘出椭圆线,并为经纬仪或GPS放样提供数据。     

闵浦大桥钢桥面环氧沥青铺装技术应用

该文首先阐述了铺装层力学分析和正交异性钢桥面局部优化设计,然后介绍了闵浦大桥钢桥面环氧沥青铺装技术标准及其室内试验研究,并介绍了该项目铺装工艺设计、施工质量标准及施工过程的质量控制。     

大跨度人行桥横向振动研究现状及展望

随着人行桥跨度的不断增大,轻质高强材料的运用,以及城市景观方面的追求,现代人行桥越来越朝着轻柔的方向发展。基于现有大跨度人行桥中不断出现的横向振动问题,该文对人行桥的行人荷载特性、横向振动理论以及振动控制方法进行了讨论,提出了人行桥横向振动研究和设计中存在的缺陷和不足,以及当前迫切需要研究的内容与方向。     

隧道围岩大变形信息化施工

建议以实施隧道监控量测的必测项目为主导,为围岩和支护的变形过程把脉,强调监控量测信息的时效性及其核心指导作用,并依据工程实例——在乌鞘岭隧道9#斜井中,围岩和支护出现大变形状态下,评判初期支护的安全性、经济性,探讨初期支护参数合理性和衬砌施作时机。建立一套简洁的监控量程实施操作系统,努力实现隧道施工过程信息化,在施工实践中协调各个关键环节,并在实际的施工效果中得到检验。     

Time-varying performance prediction and system identification of internal combustion engines

Design for life-time performance and proper maintenance measures are usually needed to prolong the mean-time-between-failures of complex equipments such as internal combustion engines. To reach this, it is important to obtain the information of time-varying system performance in design stage and to identify the structural change at each moment. So a multidisciplinary model based method is studied in this paper to unify the time-varying performance(TVP) prediction and system identification(SI) of equipments. The related multidisciplinary model in this paper should be not only precise to give simulation results but also sensitive to the variation of system parameters. So the varying history of system performance along with the structural change can be obtained from the model. Then the value of system parameters can be identified by seeking roots with given detected responding data and relationship between system responding data and system parameters. A case study on a low power gasoline engine shows that the method presented in this paper can provide useful information for the development and maintenance of complex equipments.     

一种改进的单桩计算弹性理论法

弹性理论法是单桩计算的经典理论方法。然而在单桩计算的弹性理论法中,假定桩周各桩段所受的侧摩阻力为均匀分布,这与实际工程存在较大的差异。该文针对该问题,引入桩侧各桩段的侧摩阻力为线性分布的基本假定,根据桩土界面位移协调条件,推导了相应的单桩理论计算公式,为桩基计算提供理论参考。