Simplified Calculation on Ultimate Load of Eccentrically Compressed Reinforced Concrete Members Under High Temperature 高温下钢筋混凝土压弯构件极限承载力简化计算
The data of tensile strength, ultimate conventional strains and elastic modulus under 11 different temperature conditions is obtained, by tensile testing with 110 pieces of polytetrafluoroethylene material samples. 通过对聚四氟乙烯材料110根样件的实际拉伸试验,获得了11个不同温度条件下的拉伸强度、极限名义应变和弹性模量变化数据。
At the same extrusion strain rate, both yield strength and ultimate strength decrease with increasing of the extrusion temperature. 固定变形速率时,升高变形温度则强度降低,延性增加。
It is presented that the methods for the cold-formed thin-walled short columns 'fire resistance design and checking computations by the curves of the descent coefficient of ultimate load at high temperature. 对于求出的柱高温下极限承载力退化系数曲线,给出了冷弯薄壁短柱抗火设计和验算方法。
The ultimate aim of the numerical simulation on temperature field in castings solidification process is for eliminating shrinkage/ porosity or limiting them within the user's permission. 铸件凝固过程温度场数值模拟为最终消除缩孔/缩松缺陷或将其限制在用户允许的范围内,以获得质量合格的产品提供了非常有效的手段。
Error Analysis to Calculating Value of Ultimate Stabilized Temperature Rise 最终稳定温升预测值的误差分析
In thermal balance test of the spacecraft, using temperature extrapolation technology obtain the ultimate thermal balance temperature of the spacecraft can be predicted accurately and the test duration can be shortened, and the development cost of the spacecraft can be reduced accordingly. 在航天器的稳态热平衡试验中,应用温度外推预报技术可以准确的给出航天器热平衡极限温度,缩短热平衡试验时间,从而降低航天器研制成本。
But as the strain rate is 30s-1, the ultimate reduction falls suddenly. So the temperature is unfavorable too high when the strain rate is very high. 以30s-1应变速度压缩时,在470℃时极限压下量陡然下降,说明变形速度很大时变形温度不宜过高。
The conception of bursting disk's ultimate elasticity prussure in normal temperature was advanced for the pressure vessel installed with bursting disk to ensure that the gas leak test could be carried out successfully and the bursting disk would have the correct property in the procedure of it using. 为保证气密性试验顺利进行和爆破片在使用中具有正常性能,对安装爆破片的压力容器提出了爆破片常温弹性极限压力的概念。
On the other hand, the ultimate density increased with the initial density at the same sintered temperature and keeping time. 在相同的烧结温度和保温时间下,烧结磁体的最终密度随着预成形坯初始密度的增加而提高。
The experimental results show that 0.2% yield shear stress, ultimate shear stress and 0.2% yield tensile stress, ultimate tensile stress under torsion tension combined high strain rate decrease with increasing temperature. 试验结果表明:该材料在高应变率扭拉复合加载下的名义剪切屈服强度、剪切强度极限和名义拉伸屈服极限、拉伸强度极限均随温度的升高而降低。
The results show that, with increasing the number of extrusion, the extrusion coefficient and specific resistance increase, but ultimate tensile strength and elongation at room temperature decrease. 试验表明,随着挤压次数增加,挤压系数升高,材料的室温抗拉强度及延伸率下降,电阻率升高。
The experimental results showed that the eggs of the banana moth could bear higher temperature, but 38 ℃ was ultimate temperature of the hatching for the eggs. 试验表明,蔗扁蛾卵具有较强的耐高温特性,而38℃是卵孵化的高温上限;
The results show that the strength of steels ( yielding strength and ultimate strength) increases under low temperature, while the plasticity ( elongation and sectional shrinkage) decreases. 试验结果表明,钢材的强度(屈服强度和极限强度)均随温度的降低而提高,塑性指标(伸长率和截面收缩率)随温度的降低而减小。
In the starter designing, the working point should be defined at the left of the maximum power point at room temperature, while at the right at ultimate low temperature. 最后总结了在设计开发起动机时,选择起动机的工作点常温下在最大功率点的左边,极限低温下在最大功率点的右边。
The mathematic control model was introduced including a different expression and some models for predicted cooling pattern of laminar flow/ ultimate cooling temperature in every predicted cooling pattern/ ultimate cooling temperature modified way and self learning. 控冷数学模型由层流冷却预设定冷却模式、各预设定冷却模式下终冷温度预报模型、终冷温度修正方式和自学习模型四个部分组成。
Therefore, studies on analysis and design method of cement concrete pavements in ultimate states based on actual composition of road traffic and temperature conditions become more important. In this paper, the traffic surveys and analysis of typical heavy-load road were performed firstly; 因此,根据公路实际的交通组成和温度状况,研究水泥混凝土路面结构极限状态的分析和设计方法成为迫切需要解决的问题。
Secondly, the ultimate principles of temperature field and thermal stress of concrete construction are illustrated in the aspect of heat transmission theory. Sluice temperature field and FEM form of thermal stress are deduced. 接着从热传导理论叙述了混凝土结构温度场和温度应力的基本原理,推导了适合水闸结构的温度场和温度应力有限元列式;
The comparison of ultimate strength on TT-type tubular under different temperature 空间钢管节点在高温下的极限承载力分析
Test results show that the ultimate compressive strength of the polycrystalline ice is directly proportional to the temperature and also to the logarithm of strain rate. 结果表明,极限抗压强度与负温和应变率的对数均呈正比例关系;
In this paper, a finite element software is employed to simulate the TT type tuber joints in the course of analysis, and non-linear FEM analysis is used to calculate the ultimate strength on TT type tubular under temperature. 采用有限元分析程序对TT型圆主管、方支管相贯节点进行了弹塑性大挠度分析,并且利用非线性分析的方法对节点在不同温度下的承载力进行了数值计算。
During the process of hot rolling, I phase was pulverized into large amount of dispersion particles, which pinned dislocation effectively, so ultimate strength and yield strength at room temperature were improved, as well as good plasticity was remained. 热轧过程中,I相转变成弥散细小的颗粒,能有效钉扎位错,提高了材料的抗拉强度及屈服强度,同时合金仍然保持着良好的塑性。
The higher the ultimate temperature is, The bigger the nitrogen releasing percent. 加热终温越高,氮的热解释放百分比越大;
The ultimate bearing capacity of Beams in this experiment at simple temperature, after high temperature and reinforced by CFRP is analyzed and compared. Obtain that for RC beams after fire damage strengthening with CFRP is an available method. 对本试验中梁在常温下、高温后及加固后的极限承载力进行了分析比较,得出碳纤维布对于火灾损伤后的钢筋混凝土梁,是一种较为有效的加固方法。
Ultimate axle load is decreased with increase of pavement temperature; the higher the temperature of pavement, the less load action supported by pavement structure and the easier once load damage of pavement occurs. 极限轴载随着路面温度的升高而减小;路面温度越高,路面结构所能承受的荷载作用就越小,路面越容易出现一次性加载破坏。
Test the harmonic prototype transmission precision and return difference, and calibrate the harmonic prototype rated load and ultimate load through the efficiency temperature rise experiment. 测试了谐波样机的传动精度以及回程差,通过效率温升实验标定了该谐波样机的额定载荷以及极限载荷。
By calculating the ultimate bearing capability and mechanical properties of reinforced concrete continuous beam at high temperature, the change law of internal force redistribution and deformation were analyzed in different load positions, loads levels and different numbers of heating spans. 通过计算火灾作用下钢筋混凝土连续梁的高温极限承载力和力学性能,分析了不同加载位置、荷载大小以及加温跨数等因素作用下变形和内力重分布的变化规律。