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轴心受压承载力试验构件计算长度修正方法
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作者 吴海洋 黄佩 陈小红 《电力科学与工程》 2017年第11期61-65,共5页
对L100×7、L110×7两种截面规格的角钢构件进行了轴心受压承载力试验,提出了一种剔除非理想铰接支座的影响,获得试验构件真实计算长度的方法。采用有限元对该方法进行了验证。最后采用现行规范方法计算得到了构件的轴压承载力... 对L100×7、L110×7两种截面规格的角钢构件进行了轴心受压承载力试验,提出了一种剔除非理想铰接支座的影响,获得试验构件真实计算长度的方法。采用有限元对该方法进行了验证。最后采用现行规范方法计算得到了构件的轴压承载力值,并与试验值进行了比较分析。结果显示,采用真实计算长度得到的单角钢轴心受压承载力相比采用名义计算长度提高了近30%,与试验值相差约10%~12%,与真型塔试验结果非常吻合,该方法可以用于轴心受压试验构件的计算长度修正。 展开更多
关键词 轴心受压承载力 计算长度修正方法 构件试验
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高速公路立交出入口变速车道长度的探讨
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作者 杨伟 《科技创新与应用》 2020年第36期55-56,共2页
近年来伴随着国民经济的飞速进步,国内机动车的存量也出现了快速增长的态势,新建成的道路的竣工速度显著滞后于车辆的增长。由于国内城镇化程度的持续提升,可以用于开发的土地愈加稀少,对现有道路实施升级改扩建是目前的主流模式。文章... 近年来伴随着国民经济的飞速进步,国内机动车的存量也出现了快速增长的态势,新建成的道路的竣工速度显著滞后于车辆的增长。由于国内城镇化程度的持续提升,可以用于开发的土地愈加稀少,对现有道路实施升级改扩建是目前的主流模式。文章讲述了变速车道模式的选取,并对比了国内外相关标准中变速车道尺寸的规定,设定算例计算变速车道的长度尺寸,得到的结果与国内标准中变速车道长度进行比对,对变速车道长度给出整改参照。 展开更多
关键词 变速车道 公路立交 长度计算方法
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基于时空数据的信号交叉口实时排队长度测算
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作者 石红云 《交通与运输》 2019年第2期28-32,共5页
为提高信号交叉口实时排队长度估计精度,判断交叉口实时交通状态,作为交叉口实时信号控制基础。以过饱和交叉口为例,利用磁频检测法,应用车辆到达离散模型及交通波理论研究车辆排队演化过程,实时计算有无专用转向相位两种情况下车辆排... 为提高信号交叉口实时排队长度估计精度,判断交叉口实时交通状态,作为交叉口实时信号控制基础。以过饱和交叉口为例,利用磁频检测法,应用车辆到达离散模型及交通波理论研究车辆排队演化过程,实时计算有无专用转向相位两种情况下车辆排队长度,并通过VISSIM和MATLAB仿真软件,验证算法的精度及实用性。结果表明,算法对于工程实用性较强,排队长度实时计算误差在工程应用可接受范围内,左转相位实时排队长度模型相比直行相位排队长度模型而言精度更高。 展开更多
关键词 排队长度计算方法 实时交通状态 检测器 专用转向相位
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An improvement to the simulation of phase-change heat-transfer during soil freezing and thawing 被引量:6
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作者 YANG Tao ZHENG Mao-yu 《Mining Science and Technology》 EI CAS 2009年第2期262-268,共7页
A new variable time step method,which is called the backwards calculating time step method,is presented in this paper.It allows numerical simulation of soil freezing and thawing while avoiding "phase change missi... A new variable time step method,which is called the backwards calculating time step method,is presented in this paper.It allows numerical simulation of soil freezing and thawing while avoiding "phase change missing and overflowing".A sensitive heat capacity model is introduced through which the calculation errors are analyzed.Then the equation using the self-adjusted time step is presented and solved using finite differences.Through this equation,the time needed for a space cell to reach the phase change point temperature is calculated.Using this time allows the time step to be adjusted so that errors caused by "phase change missing and overflowing" are successfully eliminated.Above all,the obvious features of this method are an accelerated rate for adjusting the time step and simplifing the computations.An actual example proves that this method can accurately calculate the temperature fields during soil freezing and thawing.It is an improvement over traditional methods and can be widely used on complicated multi-dimensional phase change problems. 展开更多
关键词 backwards calculating time step method phase change missing phase change overflowing
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On the complexity of average path length for biological networks and patterns
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作者 Waqar Asif Hassaan Khaliq Qureshi +1 位作者 Adnan Iqbal Muttukrishnan Rajarajan 《International Journal of Biomathematics》 2014年第4期51-61,共11页
Path length calculation is a frequent requirement in studies related to graph theoretic problems such as genetics. Standard method to calculate average path length (APL) of a graph requires traversing all nodes in t... Path length calculation is a frequent requirement in studies related to graph theoretic problems such as genetics. Standard method to calculate average path length (APL) of a graph requires traversing all nodes in the graph repeatedly, which is computationally expensive for graphs containing large number of nodes. We propose a novel method to calculate APL for graphs commonly required in the studies of genetics. The proposed method is computationally less expensive and less time-consuming compared to standard method. 展开更多
关键词 REDUCTIONISM average path length protein protein interaction.
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