延性系数,ductility factor
1)ductility factor延性系数
1.Analysis of ductility factor of full-web steel reinforced concrete columns;实腹式型钢混凝土柱延性系数分析
2.The ductility factor decreases with th.随着轴压比的增加,钢管自应力混凝土位移延性系数下降;而自应力的存在不仅提高了反复荷载作用下钢管混凝土的极限水平承载力,同时也使其延性系数得到显著的增加。
3.In the reduction factor methods,through the Ry-μ-Tn relationships composed of reduction factor Ry,displacement ductility factor μ,and period Tn of structures,the displacement modification factor C of structures can be computed,then the maximum inelastic displacement of structures can also be got.折减系数法中,体系通过折减系数Ry、位移延性系数μ与周期Tn的Ry-μ-Tn关系式得出位移修正系数C,既而得出体系最大弹塑性位移。
英文短句/例句

1.A Study on the Ductility Coefficient of Hollow Concrete-Filled Circular Steel Tubular Columns空心圆钢管混凝土柱延性系数的研究
2.An Analysis of Factors which Influence the Displacement Ductility Coefficient of Pre-stressing Force Frame Structure影响预应力框架结构位移延性系数的因素分析
3.It is necessary to elaborate on the definition of a fatigue coefficient such as that for ductility.有必要对疲劳系数,如延性系数的定义作详细讨论。
4.Numerical Stability of Delay-Differential-Algebraic Systems and Block Methods;延迟微分代数系统的数值稳定性及其块方法
5.cupping(ductility) value压延系数,引伸系数,拉伸系数,深拉系数
6.Numerical Stability for Several Classes of Delay Systems of Linear Discrete and Distributed Type;几类线性离散与分布型延迟系统的数值稳定性
7.Deterministic BIST and Delay Fault Testing for Digital System;面向数字系统的确定性自测试与延迟故障测试
8.Inelastic displacement amplification factor for ductile structures with the same strength reduction factor等强度折减下延性结构的位移放大系数
9.Research on Networked Control Systems with Long Time Delay and Parameter Uncertainties具有参数不确定性的长时延网络控制系统研究
10.Research on the Delay Performance of GBN-ARQ and SR-ARQ Systems in Wireless Data Transmission无线数据传输的GBN-ARQ和SR-ARQ系统时延性能研究
11.Stability Analysis and Numerical Simulation of Rosenbrock Methods for Stiff Delay Systems;刚性延迟系统Rosenbrock方法的稳定性分析及其数值仿真
12.Global Exponential Stability for a Class of Linear Systems with Delayed Perturbations;具时延的时变拢动线性控制系统的鲁棒指数稳定性
13.Analysis of Asymptotic Stability of Generalized Neutral Delay Differential Systems and Numerical Examples;广义中立型延迟微分系统的稳定性分析及其数值实验
14.Numerical Method and Stability for Delay Systems with Impulsive and Stochastic Effects具有脉冲和随机扰动的延迟系统的数值方法与稳定性
15.Exponential Stability for Neural Networks Systems with Discrete and Distributed Time-varying Delays含离散和分布时变时延神经网络系统的指数稳定性(英文)
16.Delay performance of SW-ARQ system with limited number of retransmission based on adaptive frame-size technique基于自适应帧长技术重传次数受限的SW-ARQ系统时延性能
17.Strength reduction factor spectra of constant ductility factors for bi-directional earthquake motions双向地震作用下等延性强度折减系数反应谱研究
18.Stability of the Singular Networked Control Systems with Time-Delay and Data Packet Dropout具有时延和数据包丢失的广义网络控制系统的稳定性
相关短句/例句

ductility coefficient延性系数
1.Comparing two types of damage model,it is proposed to adopt the model based on the ductility coefficient.通过比较两种不同的损伤模型,建议采用一个基于延性系数的损伤模型。
2.Using the proposed seismic design method,displacement demands and ductility coefficient of structures under different seismic fortification levels were obtained,and a multi-level demand spectrum was also formed.利用位移能力谱方法,获得了结构在不同抗震设防水准下结构的位移需求和延性系数,并构造出多水准需求谱。
3.The rational distribution of rigidity,its rational value and its relations with the ductility of multistory shear structure applied with seldomly encountered earthquake action is given in this paper through taking yielding strength coefficient and ductility coefficient into account.文章通过考虑结构的屈服强度系数和延性系数两个物理量,给出多层剪切型结构在罕遇地震作用下合理刚度的分布、取值及其与结构延性的关系。
3)ductile coefficient延性系数
1.An investigation on ductile coefficient of steel-reinforced concrete columns;钢骨钢筋混凝土柱延性系数的研究
2.By using the mathematical method of curve integrals,it derives the mathematical formula to calculate the cross-section ductile coefficient of RC ring section member.从钢筋混凝土正截面承载力计算时的基本假定出发,建立了环形截面上各种应力图形的函数表达式,利用曲线积分的数学方法,推导出计算钢筋混凝土环形截面构件截面延性系数的数学公式。
3.About structure system without obvious yield point, we determine its ductile coefficient by adopting the method of simulation yield process, at the same time, parameter p(the radio of yield process), parameter ε(ductile interval coefficient)and imaginary yield point elongation are present and applied into resistant earthquake engineering design.提出了对于没有明显屈服点△y的结构体系(或材料),可以采用模拟屈服过程法确定其延性系数和p(屈服过程比)、ε(延性区间系数)假想“屈服平台”的概念,并且尝试应用于工程设计中。
4)ductility index延性系数
1.Firstly, the relationship between structural capacity spectrum and damage index is built, and various structural allowable ductility indexes for different levels seismic damage performance objectives are provided.首先,建立了抗力谱曲线和结构损伤指数的关系,得到了反映不同设防水准损伤目标的结构地震损伤容许延性系数;其次,应用屈服位移ChoPra能力谱法确定地震损伤延性系数;然后,提出了应用结构地震损伤延性系数和容许延性系数之间的关系来评定结构抗震性能的方法;最后,通过算例说明了本文方法实施的步骤。
5)story ductility factor层延性系数
6)ductility reduction factor延性折减系数
1.Seismic ductility reduction factor for MDOF shear structures;剪切型多自由度结构体系抗震延性折减系数
2.In order to analyze the characteristic of the seismic strength demand for shear-type structures,this paper analyzes the relationship between ductility reduction factors and displacement ductility factors with structure natural vibration period by the nonlinear time-history analysis of single-degree-of-freedom systems subjected to earthquake ground motions in different site conditions.为了研究剪切型结构抗震强度需求的变化规律,本文基于单自由度体系的非线性时程分析,研究了不同场地条件下延性折减系数与位移延性系数和结构自振周期的关系;采用修正等效单自由度体系位移延性折减系数的方法,研究了剪切型多自由度体系的延性折减系数;以基于中国建筑抗震规范设计的代表不同抗震能力要求的RC框架结构为分析对象,通过静力弹塑性分析,研究了RC框架结构的体系超强能力。
3.Structure ductility reduction factor is a key parameter to reduce elastic seismic strength demand to arrive at the design level in building seismic design.结构延性折减系数是抗震设计中把弹性抗震强度需求折减到弹塑性设计水准的关键参数。
延伸阅读

阀门技术注重流量系数和气蚀系数阀门的流量系数和气蚀系数是阀的重要参数,这在先进工业国家生产的阀门资料中一般均能提供。我国生产的阀门基本上没有这方面资料,因为取得这方面的资料需要做实验才能提出,这是我国和世界先进水平的阀门差距的重要表现之一。3.1、阀门的流量系数
阀门的流量系数是衡量阀门流通能力的指标,流量系数值越大,说明流体流过阀门时的压力损失越小。
按KV值计算式
式中:KV—流量系数
Q—体积流量m3/h
ΔP—阀门的压力损失bar
P—流体密度kg/m3
3.2、阀门的气蚀系数
用气蚀系数δ值,来选定用作控制流量时,选择什么样的阀门结构型式。
式中:H1—阀后(出口)压
H2—大气压与其温度相对应的饱和蒸气压力之差m
ΔP—阀门前后的压差m
各种阀门由于构造不同,因此,允许的气蚀系数δ也不同。如图所示。如计算的气蚀系数大于容许气蚀系数,则说明可用,不会发生气蚀。如蝶阀容许气蚀系数为2.5,则:
如δ>2.5,则不会发生气蚀。
当2.5>δ>1.5时,会发生轻微气蚀。
δ<1.5时,产生振动。
δ<0.5的情况继续使用时,则会损伤阀门和下游配管。
阀门的基本特性曲线和操作特性曲线,对阀门在什么时候发生气蚀是看不出来的,更指不出来在那个点上达到操作极限。通过上述计算则一目了然。所以产生气蚀,是因为液体加速流动过程中通过一段渐缩断面时,部分液体气化,产生的气泡随后在阀后开阔断面炸裂,其表现有三:
(1)发生噪声
(2)振动(严重时可造成基础和相关构筑物的破坏,产生疲劳断裂)
(3)对材料的破坏(对阀体和管道产生侵蚀)
再从上述计算中,不难看出产生气蚀和阀后压强H1有极大关系,加大H1显然会使情况改变,改善方法:
a.把阀门安装在管道较低点。
b.在阀门后管道上装孔板增加阻力。
c.阀门出口开放,直接蓄水池,使气泡炸裂的空间增大,气蚀减小。
综合上述四个方面的分析、探讨,归纳起来对闸阀、蝶阀主要特点和参数列表便于选用。两个重要参数在阀门运用中 。