独塔波形钢腹板梁斜拉桥动力特性与抗震分析

斜拉桥一般都是交通运输的生命线工程,对斜拉桥进行正确的抗震分析设计具有重要的意义.以某高速公路跨越南水北调总干渠的波形钢腹板斜拉桥为研究对象,通过有限元建模,运用反应谱分析方法及线性时程分析方法,对该波形钢腹板斜拉桥进行动力特性及抗震分析,为其他同类工程提供了实践参考意见.     

Research on key technologies in design of middle pylon of Taizhou Bridge

At the middle pylon of a three-pylon two-span suspension bridge, the effect of unbalanced loads on the adjacent spans may result in a series of technical bottlenecks in design, such as stability and anti-slippage between saddles and main cables. This article presents the researches conducted on structure selection and behavior characteristics of middle pylon, interaction mechanism between main cables and saddles and their anti-slippage safety performance, elastic and plastic stability analysis and safety assessment of steel middle pylon, and fatigue design load and method for steel pylon of Taizhou Bridge. According to the research results, a longitudinal inverted Y shape steel middle pylon is used in design, effectively solving many technical difficulties, and this type of pylon has become a suitable middle pylon structural form for many three-pylon two-span suspension bridges.     

Space shape finding FE analysis for suspension bridge based on CR formulation method

The problem of geometric non-linearity simulation for spacial cable system was solved by introducing the truss element based on corotational coordinate (CR) system, cable structure materials and node coordinates and automatic refreshing algorithms for element internal force. And the shape-finding problem for maneuvering profile was solved with the Newton-Raphson based on energy convergence criteria with search function. This has avoided the regular truss element assumption extensively used in traditional methods and catenary elements which have difficulties in practical application because of the complicated formulas. The use of CR formulation has taken into account the stiffness outside the cable plane via a geometric stiffness matrix, realizing the 3D space analysis of a cable bridge and improving the efficiency and precision for the space geometric non-linearity analysis and cable structure, and enabling more precised simulation of geometric form finding and internal force of the large span suspension bridge main cable under construction.     

预应力斜拉索屋盖施工

预应力斜拉索屋盖是一种新颖的结构形式，某高校学生活动中心预应力斜拉索屋盖工程施工中通过采取一系列的措施，减少了拉索预应力损失及张拉拉索对屋盖造成的不利影响。     

±800kV换流站电缆屏蔽方式研究

对±800kV换流站电磁干扰的来源和传播途径进行了分析，给出了换流站中主要电磁干扰源的干扰强度，提出了电缆屏蔽的原则以及在实际工程中的应用。     

高速铁路电力供电系统的研究

高速铁路电力供电系统采用多种新技术、新设备提高供电可靠性．本文着重分析单芯全电缆设计过程中的技术难题和解决方法：使用智能箱变、电力远动系统对提高供电可靠性的作用．     

高校“三网”教学资源整合刍议

对高校的多媒体教学网、计算机校园网、双向有线电视网“三网”的教学资源进行整合，以实现教学资源共享，促进高校现代教育技术的快速发展。     

具有开口截面主梁的斜拉桥动力建模研究

开口薄壁断面是目前斜拉桥主梁的一种常用形式,本文根据薄壁杆件的特点,采用能量变分方法建立了能够考虑斜拉桥横向,竖向,纵向,弯扭耦合与纵向翘曲的空间梁单元的刚度矩阵和质量矩阵。通过对ANSYS进行二次开发,实现了上述功能,并通过算例对比了本文算法和常规算法的差别。     

分布电容导致控制电路失控问题

在远距离交流继电接触控制电路中,若以多芯电缆作为控制电路导线,其分布电容在一定条件下可导致自动控制系统失控。本文讨论导致失控的条件并给出有效控制距离的测量计算方法。     

悬索桥隧道式复合锚碇承载力计算方法

根据现场原位试验结果,分析了悬索桥隧道式复合锚碇系统(隧道式锚碇 预应力锚索)的可能破坏形态及其发生破坏的条件.采用极限理论,建立了锚碇系统的平衡方程.根据实际施工和设计特征,将锚碇-围岩接触面概化处理为4种力学模型,以节理力学理论和试验成果为基础,给出了相应的破坏准则.讨论了承载力简化计算公式中各分项系数的意义和取值方法,并用算例进行了验证.为设计工程师提供了对隧道式复合锚碇的一个整体设计思路和简化计算方法.