主梁

This paper describes chiefly the basic principle and method of the optimum design of the crane girder by using the feasible direction method.

本文主要阐述用FDM方法对起重机主梁进行优化设计的基本原理和方法，并对儿种主梁进行了初步计算。

The creep is the main reasons why the deflection of the girder is larger than that of code.

混凝土的收缩徐变和车辆超载是大跨度连续梁桥主梁下挠严重的主要因素之一。

According to in the theoretical calculation and the construction process to the king post amount of deflection and the linear survey, various stages Liang Ti elevation is under the effective control to the construction process in.

根据理论计算和施工过程中对主梁挠度和线形的测量，对施工过程中各节段梁体的标高得到有效的控制。

In this article,a simplification of the entire bridge lattice into a "Plate Girder Frame" whose solution can be found by means of the force method is used instead.

在现有计算双梁桥架的内力的方法中，都是将桥式起重机的主梁简化成简支梁来计算的。

Based on the generalized potential variational principle of nonlinear elasticity theory with large deflection, the incomplete generalized potential energy functional with large deflection is established on the space coupling free vibration of collaborated system structure by considering the effect of axial compressive and shearing strain energy of stiffening girder.

摘要基于大位移非线性弹性理论的广义变分原理，考虑加劲梁轴向压缩应变能和剪切应变能的影响，建立了协作体系斜拉桥空间耦合自由振动的大位移不完全广义势能泛函，通过约束变分导出了协作体系斜拉桥的加劲主梁竖向挠曲振动微分方程。

It is studied that the responses of overhead crane when the trolly is running. The simulation of lifting load process, location of the trolly and stresses of structure by computer are discussed and after verified by the experiments, we have got distribution function of stresses in stucture of overhead crane under different load states and distribution functions of location of the trolly.

研究了小车运行时桥式起重机的动态响应，讨论了起重机吊重载荷过程、小车位移及桥式起重机主梁结构应力的计算机仿真，在得到实测数据的验证之后，通过计算机仿真得出不同载荷状态及不同小车位移分布下桥吊主梁结构应力的分布规律。

In this paper, the dynamic characteristics of a beam with viscous damping layers are studied. For convenience to analyze by transfer matrix method, the concept of equivalent dissipated energy is utilized to transform the damping layers to be uniformly soloed into the beam body without changing thesis damping effect.

中文摘要本文是以梁含有黏滞阻尼作动态特性研究，为了方便作分析，本文利用传递矩阵法作分析，再以消散能等效原理，将阻尼均匀融入在主梁其不改变阻尼效益。

With the theory of energy random analysis of train derailment, the security of moving train on up line and down line of Laoluanhe bridges is analyzed contrastively, and the influence on improving resisting derailment ability of bridges by widening the distance between two main beams of the deck steel plate girder bridge is studied.

进一步运用列车脱轨能量随机分析理论，对比分析了老滦河桥上、下行线上的列车走行安全性，分析了增大钢板梁主梁中心距对提高桥梁抗脱轨能力的影响。

Each bridge is a two girder continuous structure extending over three spans with small haunches at the interior piers.

每一座桥是双主梁的连接梁，延伸三跨，在中间桥墩处具有小的加腋承托。

Through analying controlling methods , the paper uses the method of Grey Forecasting Control to forecast inflection of main beams" deflections , and redacts a program to calculate inflection of main beams" deflections and the elevation of formwork during the construction.

通过分析现有控制方法，提出采用灰色理论预测法对主梁挠度变化进行预测，并用C语言编写了程序以计算施工过程中梁段的挠度变化值。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐