斜拉桥架设分析的新算法

斜拉桥各架设阶段几何形态与内力的确定是施行工程控制的重要前提。目前普遍采用的倒拆法数据量大，计算周期长、对大跨度斜拉桥更是如此。本文提出一种斜拉桥架设分析的新算法——状态比较法。该方法无需做各施工状态间的模型转换，就可直接确定任意施工状态下的几何形态和内力。并可计入索的刚度损失、梁柱效应及大变形等非线性因素的影响。算例表明，该方法实用、正确、方便，是进行斜拉桥架设分析的一种理想方法。

水文测流铅鱼缆道主索、循环索设计实例分析

水文测流铅鱼缆道是我国水文站主要测流设施。文章通过南岔水文站水文电动缆道设计实例分析,重新计算了新选取的主索及循环索的各项要求,新选取的主索、循环索有效的提高了南岔站水文测流铅鱼缆道的测洪能力。摆脱了原有手摇缆道测洪能力低、测验设备陈旧的原始测流方式。经过科学计算,保证了设备、人员在水文流量测量工程中的安全,极大的提高了南岔站水文测验的精度和规范要求。

关于钻井勘探电力供应的分析

随着我国经济发展脚步的加快,我国对于能源的需求也不断增加。作为经济发展的主要能源,石油的开采一直以来都是我国经济发展建设的基础。钻井勘探的电力供应作为石油勘探开采的重要组成部分,其架设与运行稳定是目前钻井勘探电力供应部门的重要工作。文中就钻井勘探电力供应进行了简要的论述和分析。

Design and Experimental Analysis of NLT Trussed Rafter in Yellow Pine

The roof system of social housing in Brazil generally consists of components made out of native forest lumber of high market value. Taking into account the increasing number of planted forests and the need to develop new products and to add value to this timber, this work deals with the development and structural analysis of a roof system using yellow pine plantation wood （Pinus spp）, a sustainable material which however presents many defects. The NLT （laminated nailed timber） technology was chosen as it allows the use of shorter length and smaller cross section pieces, eliminating major defects. Seven samples of structural trussed rafters in NLT were tested; six made out of graded timber and one ungraded in order to verify the impact of the wood grading in the structural performance of the model. The results showed that the trussed rafter system in NLT meets the necessary structural performance requiring poor conditions of infrastructure for manufacture process, and that the graded wood samples showed better performance than the ungraded one.