斜拉桥间隔挂索方案的可行性研究

依据中缅天然气管道工程(国内段)北盘江斜拉索跨越工程为背景,介绍一种间隔性挂索方案,即悬臂安装多段主梁,选择性张拉部分拉索,以提高施工速度,尽早实现主跨合龙,并对该方案的可行性进行全过程有限元仿真分析。通过对比分析两种假设方案的计算数据,验证了方案的可行性,为该类轻型斜拉桥快速合龙架设方案提供参考。     

Cyclic testing of steel column-tree moment connections with weakened beam splices

Traditionally, the beam splice assemblies of column-tree connections are designed according to the full-strength design principle. Actually, the beam splice is set up at a certain distance from the column face, thus the plastic moment capacity of the beam splice does not need to be greater than the plastic moment capacity of the beam. This paper experimentally presents the effects of the weakened beam splice on the seismic performance of column-tree steel moment connections. Cyclic tests of two column-tree connection specimens with weakened beam splices and one specimen following the full-strength design principle were conducted to verify their inelastic behavior and failure modes. The test results showed that the moment resisting capacity of the column-tree connection specimens with weakened beam splices did not obviously decrease. Also, their energy dissipation capacity was better than that of the specimen following the full-strength design principle.     

Research on design of through-diaphragm connections between CFRT columns and HSS beams

The through-diaphragm connection detail has been identified as a good choice for attaching HSS beams to concrete-filled rectangular tube columns in engineering applications. In this research program an analytical study was conducted to comprehend the behavior of this detail and develop the accompanying design guidelines. The experimental results are presented elsewhere. In this paper two analytical models were established to predict the shear stiffness and yield shear strength of the HSS beam and panel zone, respectively. Theoretical results based on the proposed model well agreed with the experimental data. Finally, design provisions were introduced to check the strength in the connections.     

论中国审美思维在传统建筑空间环境中的体现

本文通过对中西方审美思维模式的比较,以及对中国"主体性、意念性、浑整性"三种传统审美思想特点的阐述,分析和阐释了这种思维特征在中国传统建筑空间环境创作中的具体表现和运用,实证了其在传统建筑空间营造中的广泛存在性,同时论述了传统审美思维在当今建筑设计领域的应用。     

探析房建工程施工质量管理和控制

近年来,因为我国市场经济的飞跃,建筑行业也得到了崛起,建筑工程量随之年年攀升,这使得建筑市场泥沙俱下。施工单位一定要强化对建筑工程质量的控制,保证房建工程不会出现质量问题。本文初步探讨了房建工程施工质量的管理控制问题,对于如何加强对建筑工程质量管理掌控的方法手段提出了一些看法。     

美国NEBS认证

电子通讯设备进入美国市场必须进行NEBS认证.介绍了NEBS两大标准的内容、要求和认证等级.根据经历过NEBS认证的设备商的经验,总结给出了NEBS认证过程中的注意事项和建议.     

无卤型电缆用无机耐火隔板 无卤型电缆用无机耐火槽盒

1　前言　　近年来 ,我国电力部门、供电部门和用电量较大的工矿企业 ,因电缆着火延燃酿成火灾时有发生 ,给国民经济带来较大损失。电缆火灾事故无论是由外界火源引起 ,或是自身故障造成 ,都有火势猛、蔓延快、抢救难、损失重大的特点 ,电缆着火原因多样化 ,又难以从根本上避免     

对工程中弱电系统和机房防雷接地的体会

本文在总结现场监理工作经验的基础上,简要介绍了弱电系统和机房接地的重要性及技术要点。     

由基频计算拉索拉力的实用公式

振动法测索力广泛应用于索结构的施工控制、状态评估和健康监测,其基本原理是基于弦振动理论。弦理论忽略了索的垂度和抗弯刚度的非线性影响,在实际应用中有时会带来不可接受的误差。采用能量法和曲线拟合方法,建立了分别考虑索垂度和抗弯刚度影响,由基频计算索力的实用公式。对公式的适用范围进行了讨论,并与现有解的结果进行了比较,表明本文公式可满足精度要求。     

凤梨养管月历

近年来,千姿百态,品种繁多的凤梨受到越来越多人们的喜受。时值新年,红艳艳的凤梨一枝独秀,好看又讨喜,而且观赏期长,养管又较方便,更令它成为家庭养花的新宠。若是家有凤梨,应该怎样养护?每个月要做些什么工作?本栏的"凤梨养管月历"会为你一一细细解说。