共查询到20条相似文献，搜索用时 385 毫秒
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钢筋砼L-形截面双向拉弯构件正截面承载力的研究 总被引：1，自引：0，他引：1
对钢筋砼 L-形截面双向拉弯构件的正截面承载力进行了研究 ,还对三根钢筋砼 L-形截面双向拉弯构件进行了试验研究 .编制了计算机程序 ,可用于各种类型截面的计算 ;并用此程序对 L-形截面在双向拉弯作用下的 N- M相关曲线、等轴力下的 Mx- My相关曲线进行了计算分析 ,理论计算结果与试验结果吻合较好 相似文献
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为探究SRC柱抗拉性能基于ANSYS分析的可行性,并进一步深入了解SRC受拉构件的应力、变形分布情况,选取轴心、小偏心和大偏心3根受拉构件进行试验,并绘制荷载位移曲线,且用ANSYS对构件的应力和变形进行分析,形成ANSYS荷载位移曲线,将两种曲线进行对比分析,发现ANSYS荷载位移曲线可以较准确地反映试验构件的变化趋势. 相似文献
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钢筋混凝土受扭构件计算中,薄膜元理论计算模型需要一套准确的材料本构关系方程,本文考虑了钢筋混凝土受扭构件开裂后受拉混凝土的作用,分析了其对受扭构件承载力和变形的影响.对计算模型中的受拉混凝土和钢筋的本构关系方程作了改进,并对受扭构件承载力和变形做了计算,理论结果和试验结果吻合较好. 相似文献
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根据近期开展的PFRP布受弯构件加固试验和多年的结构试验经验,并结合工程结构设计、施工经验,对PFRP布加固试验张拉、锚固关键问题提出了符合工程实际的解决方法而能用于工程实际。 相似文献
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工程木是现代木结构建筑的常用材料,依据相关标准试验测定花旗松的物理力学性能,得出了花旗松木构件的本构关系,即木材受拉时为线弹性,受压时为弹塑性,这为木结构构件的理论分析和试验研究提供了借鉴作用. 相似文献
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《光的传播》一课,要求学生通过实验认识光是沿直线传播的。教材中设计的实验是:用纸卷一个直筒,通过这个纸筒,能看见电灯发出的光,把纸筒折弯,就看不见电灯发出的光。由此来证明光是沿直线传播的。 在第一班教学时,实验之后却有一部分学生这样告诉我:“纸筒直的时候,能看见电灯发出的光,可纸筒折弯以后,由于通道被堵死了,所以就看不见电灯的光了。”我一看他们的纸筒,发现由于纸筒很软,稍微用力一折,里 相似文献
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采用高延性纤维增强水泥基材料部分代替钢筋混凝土梁受拉区的混凝土得到 ECC/RC 组合梁构件,可以有效提高梁的延性及抗裂性能. 基于平截面假定和材料本构模型,分析组合梁构件在受力过程中各个阶段的截面应力应变状态,得到各阶段承载力的计算方法. 根据混凝土结构设计规范,提出了 ECC/RC 组合梁极限承载力的简化计算方法,并给出了组合梁构件的弯矩-曲率关系,得到组合梁延性的简便计算方法.最后,采用一个组合梁的试验结果对理论公式进行验征. 结果表明: 计算结果和试验结果吻合得较好,证明所提出的组合梁各阶段受弯承载力计算方法是正确的,具有一定的理论意义和参考价值. 相似文献
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在零构件疲劳失效的分布规律的基础上,对多种零构件疲劳强度可靠性实验数据进行统计分析,充分利用疲劳S-N曲线的对数线性关系,通过引入静态机械性能参数断裂真应力和疲劳循环基数两个特征值点,较好地实现了零构件制造工艺性能参数与疲劳特性结合,获得一种零构件疲劳可靠性工程评价方法。本文还报告了在连杆、转向节、混凝土道路小样零构件的疲劳强度可靠性评估工作中的试验、统计、应用情况。本文方法具有简单、实用、易于推广的特点。 相似文献
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The paper is to design and construct a coupled elasto-plasticity damage constitutive model for concrete. Based on the energy dissipation principle, the Hsieh-Ting-Chen four-parameter yield function is used. The model can reflect different strength characteristics of concrete in tension and compression, and reduce the limitation and lacuna of the traditional damage constitutive models for concrete. Furthermore, numerical test for concrete stress-strain relation under uniaxial tension and compression is given. Moreover, the damage process of concrete gravity dam is calculated and analyzed in seismic load. Compared with other damage constitutive models, the proposed model contains only one unknown parameter and the other parameters can be found in the Hsieh-Ting-Chen four-parameter yield function. The same damage evolution law, which is used for tension and compression, is good for determining stress-strain constitutive and damage characteristics in complex stress state. This coupled damage constitutive models can be applied in analyzing damage of concrete gravity dam and arch dam. 相似文献
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对MTS810电液伺服材料试验机在位移控制和载荷控制两种控制方式下的动力学响应特性进行了研究。以岩石压缩测试数据为例,对载荷-时间曲线、位移-时间曲线进行了对比分析,发现岩石破坏过程中,位移控制方式下可以观察到岩石的局部损伤至破坏的演化过程,载荷在岩石破坏时刻突然降为0;而载荷控制方式下看不到损伤演化过程,载荷未突然降为0。说明试验机本身的结构响应会影响对试样力学性能的测试。 相似文献
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莫协强 《安顺师范高等专科学校学报》2013,15(4):117-119
当机械系统的零件作随时间而变化的运动时,该系统就为振动系统,因此机械零件对动载荷的响应可认为是振动.机械设计中要考虑的响应为应力和变形,而激励(动载荷)为力和加速度.文章将概率论与随机过程在阻尼器力学性能试验中的应用进行分析. 相似文献
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This paper presents a precise solution to predict the behavior of steel fiber reinforced concrete (SFRC) under the four point
bending test (FPBT). All the force components at the beam section (before and after cracking) are formulated by applying these
assumptions: a realistic stress-strain model is used for concrete behavior in compression, a linear response is considered
for the uncracked tension region in a concrete constitutive model, and an exponential relationship is proposed as a stress-crack
opening in the crack region which requires two parameters. Then the moment capacity of the critical cracked section is calculated
by using these forces and satisfying equilibrium law at the section. Parametric studies are done on the behavior of SFRC to
assess the sensitivity of the solution. Finally, this solution is validated with some existing experimental data. The result
shows the proposed solution is able to estimate the behavior of SFRC under FPBT. 相似文献
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The recently developed elastic-viscoplastic self-consistent model with various self-consistent schemes was applied to study the effect of basal texture on the mechanical behavior of magnesium alloy AZ31B sheet. The influence of the basal texture was investigated using various initial textures generated by artificially tilting the measured texture of the reference AZ31B sheet around in a transverse direction. The material parameters for the various models were fitted to experimental uniaxial tension and compression along the rolling direction and were then used to study the effects of the basal texture on the yield stress, R value, ultimate stress and uniform strain under uniaxial tension. The effect of the basal texture on sheet metal forming was further assessed by calculating the limit strain under in-plane plane strain tension. An assessment of the predictive capability of polycrystal plasticity models was made based on comparisons of predictions and experimental observations. Among the available self-consistent approaches, the Affine self-consistent scheme resulted in the best overall performance. 相似文献
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基于AutoCAD动态块在机械设计中的应用方面进行了深入的研究。动态块的参数确定和动作确定直接对机械设计效果影响很大。通过基于AutoCAD的动态块来实现典型零件的设计工作。通过内、外螺纹剖视图的实例,给出了在机械设计中使用动态块的规律、方法和优势所在。 相似文献
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FRP加固RC圆柱正截面受弯承载力计算（英文） 总被引：1，自引：0，他引：1
运用数值计算方法对FRP加固钢筋混凝土（RC）圆柱截面特性进行计算,发现截面破坏时受压区高度主要受轴压比、FRP约束强度比和纵筋配筋特征值3个主要参数影响.根据数值计算的结果进行回归,提出了受压区对应圆心角θ的计算方法.数值计算结果显示,横向约束导致的混凝土应力提高以及纵筋屈服后的强化效应使RC柱破坏时截面受弯承载力远大于规范规定值.根据理论分析和36个大比例试件实测结果提出截面破坏时受弯承载力计算方法,计算结果与试验结果吻合很好.最后,对一个典型柱变形能力进行参数分析,研究轴压比,纵筋配筋特征值和FRP约束强度比对正截面变弯承载力的影响.结果显示FRP加固圆柱破坏时受弯承载力可以比规范规定的未加固柱受弯承载力提高50%左右. 相似文献
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Recent research has shown that circular hollow section (CHS) joints may exhibit non-rigid behavior under axial load or bending.
The non-rigid behavior significantly affects the mechanical performance of structures. This paper is concerned with the parametric
formulae for predicting axial stiffness of CHS X-joints while braces are in tension. The factors influencing the axial stiffness
of CHS X-joints under brace axial tension are investigated, including the joint geometric parameters, the axial force of the
chord, and bending moments of braces in two directions, etc. Effects of various parameters on axial stiffness of CHS X-joints
are examined by systematic single-parameter nonlinear analysis using shell finite element methods. The analysis is implemented
in a finite element code, ANSYS. The observed trends form the basis of the formulae for calculating the joint axial stiffness
under brace axial tension by multivariate regression technique. In order to simplify the formulae, two non-dimensional variables
are introduced. The proposed formulae can be used to calculate the joint axial stiffness in the design of single-layer steel
tubular structures. 相似文献