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荷载     
相关语句
  load
    Strength and Limit Load Analysis of Concrete Arch Dams
    混凝土拱坝的强度计算与极限荷载分析
短句来源
    Computation of the Temperature Field and Temperature Load in Arch Dams (Ⅰ)
    拱坝温度场和温度荷载的计算(Ⅰ)
短句来源
    Computation of the Temperature Field and the Temperature Load in Arch Dams Ⅱ
    拱坝温度场和温度荷载的计算(Ⅱ)
短句来源
    Non-linear Analysis and Ultimate Load Estimation for Arch Dams
    拱坝非线性分析与极限荷载的估算
短句来源
    Further Study on Static Calculation of Water Load Acting on Tunnels
    再论隧洞水荷载的静力计算
短句来源
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  loading
    Fracture analysis of structure subjected to dynamic loading
    在动荷载作用下的结构断裂分析
短句来源
    Experimental study of the fracture characteristics of concrete under high speed loading
    高速荷载下混凝土断裂性能的试验研究
短句来源
    Research on Concrete Strength and Deformation Behaviour Under Dynamic Loading and Its Test Methods
    动荷载下混凝土强度变形特性及其试验方法的研究
短句来源
    A Finite Element Analysis of Displacement and Stress of Powerhouse Structure of Hydropower Station under the Temperature Loading
    水电站厂房结构在温度荷载下位移与应力的有限元分析
短句来源
    Fracture mechanics analysis method of crack in arch dam under temperature loading
    温度荷载作用下拱坝裂缝的断裂力学分析方法
短句来源
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  loads
    Study on Dynamic Response of Structures and Ground Subjected to Moving Loads
    移动荷载作用下结构与地基动力响应特性研究
短句来源
    Methods of solution for shape optimization of arch dams under static and dynamic loads
    在静力与动力荷载作用下拱坝体形优化的求解方法
短句来源
    The response of joints opening,dam stress and acceleration under earthquake loads are discussed.
    讨论了在地震荷载作用下抗震钢筋对坝体横缝张开度、坝体应力以及加速度响应的影响。
短句来源
    In this paper, interaction relation between gate structures and flow-loads is revealed through analysis of hydrody-namic loads and vibration characteristics of gate structures.
    通过水动力荷载与闸门结构振动特性分析,揭示闸门结构与水流荷载两者作用关系。
    The risk to construct a high RCC dam is much higher than that to construct a medium sized or low RCC dam due to the differences between their loads and resistances, the designing of the high RCC dam is also different.
    由于在荷载和抗力等诸方面的差异,RCC高坝的建设风险远高于中、低坝,尤其是200m级的高坝。 因此,与中低坝相比,高坝的设计要求也将有所不同。
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  load in
    Computation of the Temperature Field and Temperature Load in Arch Dams (Ⅰ)
    拱坝温度场和温度荷载的计算(Ⅰ)
短句来源
    Computation of the Temperature Field and the Temperature Load in Arch Dams Ⅱ
    拱坝温度场和温度荷载的计算(Ⅱ)
短句来源
    INFLUENCE OF TEMPERATURE LOAD IN THE FULL-STRESS DESIGN OF ARCH DAM
    拱坝满应力设计中温度荷载的影响
短句来源
    Calculating Method of Blasting Load in Rock Slope Engineering
    岩石边坡爆破动力荷载计算方法初探
短句来源
    Study of the Seismic Load in Workshop of Hydropower Station in River Channel
    河床式水电站厂房地震荷载研究
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      load
    Compounds Ia-Ih were hydrogenated with Pd-C to give IIa-IIh, and their hypoglycemic activity was evaluated with a glucose oxidase kit and insulin load test on normal mice.
          
    A complex load shading parameter is set up to describe various load shading schemes.
          
    The imaginary part of the load shading parameter describes the states of switches of load shading schemes while the real part is the corresponding amount of shaded load.
          
    The procedure to search the operation with the least amount of shaded load for a feeder and a connected domain are detailed.
          
    Results of analysis show that the direct load shading scheme under the most balanced topology is not always the optimal scheme.
          
    更多          
      loading
    With a loading molar ratio of Ag/Ti = 0.135 in TiO2 film, the maximum catalytic efficiency was observed.
          
    The effects of experimental variables such as the buffer solutions, pH and the amount of loading enzyme were investigated for the optimum analytical performance.
          
    The loading efficiency of porcine hemoglobin (pHb) in microcapsules is more than 90%.
          
    The oxidation current of methanol on the Pt-CNTs/GC electrode did not always increase with the increase in the amount of Pt loading.
          
    The result indicates that there is an optimal Pt loading for methanol oxidation.
          
    更多          
      loads
    The effects of different viscous damping diameters, inlet pressures of pipe rupture valve, and elevator loads on the hydraulic elevator system's dynamic performance are analyzed.
          
    The research about hysteresis characteristic of finger seal (FS), which was carried out based on the model with static loads, could not reflect the dynamics behavior of FS system when the rotor runs at high speed.
          
    Unified solution of limit loads of thick wall cylinder subject to external pressure considering strain softening
          
    Volumetric loads of TN dropped dramatically and effluent TN concentration increased quickly when the concentration of average dissolved oxygen was more than 4.0 mg/L.
          
    It is found that stabilization of the optimum specific substrate loads provides the maximum economic coefficient of the process.
          
    更多          
      load in
    A complex approach to studying the physiological basis of the individual and typological features of functional states and tolerance of physical load in healthy young individuals using superslow physiological processes (SSPP) was elaborated.
          
    Electrical activity of the triceps surale muscle under static load in patients with chronic peripheral circulatory insufficiency
          
    A Hemodynamic Reaction to the Orthostatic Load in Schoolgirls with Various Behavioral and Blood Circulation Types
          
    The exercise performed at 50% of maximum muscular force was taken as an optimum load in kinesotherapeutic programs.
          
    The total training load in group II was significantly lower than in group I (77 ± 5 vs.
          
    更多          


    This paper discusses some problems which are found to be important in designing the arch dam of the Liv-Hsi-Ho-hydroelectrical power station. The arch dam under discussion has a max. height of 82 m and spans 255. m, situated in a V-shaped valley. It is an overflow arch dam of the various radius and thickness type. The technical design has been nearly finished and the dam is now under construction. The first problem discussed is the investigation of the stability of arch dam under various ioads when the dam...

    This paper discusses some problems which are found to be important in designing the arch dam of the Liv-Hsi-Ho-hydroelectrical power station. The arch dam under discussion has a max. height of 82 m and spans 255. m, situated in a V-shaped valley. It is an overflow arch dam of the various radius and thickness type. The technical design has been nearly finished and the dam is now under construction. The first problem discussed is the investigation of the stability of arch dam under various ioads when the dam is rested on a rock foundation with unexpected jointe and cracks. Methods and formulas for the determination of stability factors are recommended. Then the paper reviews the various methods of stress andlysis of arch dams now in use and finds that the cantilever-arch method (or so called the trial load method) is a suitable one. An amphified procedure is suggested, with this procedure and by means of certain tables of founda- tion and arch deformation constanis, the analysis of stressos and deflections of a circular arch including the effect of foundation deformation can be simplified greately without sacrifyinq dccuracy. The necessdry tables needed in analysis will be presented in an dnother paper. The problems of temperature control and temperature stresses determination are also impor- lant ones in arch dam design and construction. This paper discusses the vdrious principles of temperature control and method of computation, and describes the one accepted in this dam. The priciples of analysis of temperature stresses of arch dams are discussed in detail. Finally the problem of discharginq floods over the arch dam is described in brief. The design work in this respect has not been finished, further investigations and model tests are roquired.

    本文旨在论述流溪河拱壩工程在设计中一些主要问题。拱壩最大壩高82公尺,壩顶弧长255.5公尺,位于一V形山谷中。壩体大不同半径和厚度拱壩并采用壩顶溢流形式。工程设计及施工已接近完成。本文首先探讨了拱壩壩头岩基具有节理和裂隙时在不同荷载下的稳定问题。推荐了决定系数的方法和公式。其后就现有的拱壩各种放力分析方法进行了论述并认力悬臂拱法(或称试载法)较为适用。本文对于试载法提出了改进步骤,利用这些改进步骤并借用一定数量的基础和拱圈变形常数表则计算应力分析和包括基础变形的圆拱变位可大大简化并无损其精度。在分析中所需数表将另著文介绍。控制拱壩温度和确定温度应力问题在拱壩设计和施工中也极关重要。本文论述了温度控制的各种原理和计算方法,并描述了本工程所采用的措施。对于拱壩温度应力的分析原理曾加论述。最后曾就拱壩壩顶溢流问题加以简述。有关此项新颖问题的设计,需待进一步研究并进行模型试验。

    In this Paper,the important problems of temperature stresses in arch dams are analyzed. Firstly,we consider the transient elastic three dimensional temperature stresses.It is pro- posed to cut the dam into horizontal and vertical systems,compute the stresses and dis- placements arisen therein by the nonlinear temperature distribution on the assumption of Plane section of Bernoulli-Navier,then adjust the displacements of the horizontal and ve- rtical systems by the so called trial load method.Some tables are...

    In this Paper,the important problems of temperature stresses in arch dams are analyzed. Firstly,we consider the transient elastic three dimensional temperature stresses.It is pro- posed to cut the dam into horizontal and vertical systems,compute the stresses and dis- placements arisen therein by the nonlinear temperature distribution on the assumption of Plane section of Bernoulli-Navier,then adjust the displacements of the horizontal and ve- rtical systems by the so called trial load method.Some tables are prepared to simplify the calculation.A simple method is suggested to calculate stresses in thick archs.The method of equivalent hydraustatical pressure for temperature variations in arch dams is discussed. The defects of this method are pointed out. Secondly,the influence of creep of concrete is considered.For mature concrete the creep C(t,τ)may be expressed by the following formula: C(t,τ)=C_[1-e-r(t-τ)](49) Where Co and r are constants determined by tests,τ is the time at which the load is applied,and t is the time considered.Then for the sinusoidal temperature stresses,σ= F(x,y,z)sin t,the coefficient k of stress relaxation may be computed by k=sinθ-E_C_r·(g sinθ-ωcosθ)/g~2+ω~2(59) θ=tan~(-1)[(g~2+ω~2)/(E_C_rω)-g/ω](58) Where k=(max.elastic temp.stress)/(max.Visco-elastic temp.stress), E_0=Young's modulus of concrete,θ=time lag of max.str,g=r(1+E_0C_0).As shown in the second example,for concrete of portlant cement,k=0.417 for annual temperature variations,k=0.993 for 15 days Variations,k=1.00 for daily Variations,the stress-time curves are shown in Fig.10.Cofficient k is independent of x,y,z. Thirdly,the problem of subcooling is considered.The stresses caused by subcooling at the time of grouting contraction joints are also reduced by creep of concrete at later time. The final coefficient k of stress relaxation may be computed by k=1/(1+E_0C_0)(65) As shown in the third example,k=0.357 for concrete of portlant cement.

    本文对拱坝温度应力的几个主要问题进行了研究。全文分为三部分,第一部分研究拱坝瞬时弹性温度应力的计算问题,建议把伯努里-纳维埃关于断面在变形后保持为平面的假定与试荷载法相结合来解决拱坝温度应力的空间问题,并提供了计算公式和图表,以便利计算。对厚拱坝的应力分析提出了一个简捷的近似处理方法。对温度折算成静水压力计算的方法进行了评述,指出了它的缺点。第二部分研究混凝土徐变对拱坝温度应力的影响,我们引用马斯洛夫教授关于混凝土徐变的积分方程来分析外界温度按简谐变化时的温度应力问题,得到了一个方便的计算公式。第三部分研究拱坝灌缝时的过度冷却对降低温度应力的效果问题,也建议了一个计算方法。

    ~~

    少筋混凝土,就其性质而言,是介于混凝土及钢筋混凝土之间的建筑材料,很多大型水工建筑物是由少筋混凝土建成的。本文系按照1956年修订的4236-48,重新推导了少筋混凝土水工结构在各种荷载作用下的计算公式。这些公式可用于钢筋流限为σ_T=2,500,2,850,3,500公斤/公分~2的构件,这就扩大了技术科学博士拉乌普曼所建议的少筋混凝土计算方法的应用范围。根据本文导出的公式,可以编制便于计算的图表。

     
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