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1.
基于平面桁架有限元分析的基本原理,利用MATLAB软件对某平面桁架编制了计算程序,得到了结构的内力计算结果、变形图和结构的动力特性,并将计算结果与ANSYS有限元分析软件的结果进行比较.结果表明,二者的计算结果一致.利用MATLAB可以编制结构有限元分析程序,计算速度快,数据准确,并能为复杂结构有限元分析提供参考. 相似文献
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为了获取某四驱汽车防滑差速器壳体的固有振动特性和验证所建有限元模型的正确性,以某四驱汽车防滑差速器壳体为研究对象,首先基于Abaqus软件对其进行模态仿真分析,得到了防滑差速器前6阶固有特性参数及其振型;然后运用锤击实验对防滑差速器进行模态分析实验,测取其振动情况;最后将两种方法获取的差速器壳体前6阶振型及振动频率进行对比。结果发现两种方法获取的各阶振型基本一致,固有频率误差在5%以内。这种以模态仿真分析为前提,模态实验为补充,仿真结果与实验结果相对比的分析方法有效地验证了有限元模型的正确性,为防滑差速器的有限元分析提供了有效的参考依据。 相似文献
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A double strut cable dome structural system was presented to improve the mechanical behaviour of a cable dome. This structure has good stability and is convenient to construct. To investigate its construction method and static performance, a structural model with a 6-m diameter was designed. From the nodal equilibrium equation, the calculation formulas for the prestress distribution with self-weight considered were deduced. Two types of construction methods, namely, assembling at high altitude and integral lifting, were adopted in the shape-forming process of the double strut cable dome, monitoring the internal force of the cable-strut components and the structural deformation. According to loading tests under full-span load and half-span load, the static behaviour of the structure was obtained and compared with the results from finite element analysis. Using the formulas deduced in this paper, the actual initial prestress considering self-weight for a double strut cable dome can be obtained accurately. This structure was suitable for tensioning the outer diagonal cables to apply prestress. Combined with the construction method for integral lifting, the difficulty and workload of the construction process can clearly be reduced, making the structure favourable for engineering application. Under an external load, the internal force of the ridge cables and inner diagonal cables decreases and the internal force of the other components increases. The results of the model tests were in good agreement with those of the finite element analysis. 相似文献
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The nonlinear analysis of reinforced concrete rectangular slabs undermonotonic transverse loads is performed by finite element method.The layered rectangu-lar element with 4 nodes and 20 degrees of freedom is developed,in whichbending-stretching coupling effect is taken into account.An orthotropic equivalentuniaxial stress-strain constitutive model of concrete is used.A program is worked out andused to calculate two reinforced concrete slabs.The results of calculation are in goodconformity with the corresponding test results.In addition,the influence of tension stif-fening effect of cracked concrete on the results of calculation is discussed. 相似文献
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《天津大学学报(英文版)》2015,(3)
In order to improve the seismic performance, deformation ability and ultimate load-carrying capacity of columns with rectangular cross section, engineered cementitious composite(ECC) is introduced to partially substitute concrete in the edge zone of reinforced concrete columns and form reinforced ECC/concrete composite columns.Firstly, based on the assumption of plane remaining plane and the simplified constitutive models, the calculation method of the load-carrying capacity of reinforced ECC/concrete columns is proposed. The stress and strain distributions and crack propagation of the composite columns in different states of eccentric compressive loading are analyzed. Then, nonlinear finite element analysis is conducted to study the mechanical performance of reinforced ECC/concrete composite columns with rectangular cross section. It is found that the simulation results are in good agreement with the theoretical results, indicating that the proposed method for calculating the load-carrying capacity of concrete/ECC composite columns is valid. Finally, based on the proposed method, the effects of ECC thickness, compressive strength of concrete and longitudinal reinforcement ratio on the mechanical performance of reinforced ECC/ concrete composite columns are analyzed. Calculation results indicate that increasing the thickness of ECC layer or longitudinal reinforcement ratio can effectively increase the ultimate load-carrying capacity of the composite column with both small and large eccentricity, but increasing the strength of concrete can only increase the ultimate loadcarrying capacity of the composite column with small eccentricity. 相似文献
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倒T型钢混凝土组合梁正截面抗弯承载力计算分析 总被引：1，自引：0，他引：1
由一般的非对称性工字型钢混凝土组合梁,采用变形协调模型推导总结不同情况下的型钢混凝土组合梁正截面抗弯承栽力计算公式,进而得到倒T型钢混凝土组合梁的正截面承载力。通过算例,采用推导的理论公式及ANSYS软件对等截面、等含钢量的两类组合梁的极限承栽力进行分析计算,表明倒T型钢混凝土组合梁正截面受力较工字型钢混凝土组合梁好及采用的理论公式是正确可行的。 相似文献
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陈鹏 《泰州职业技术学院学报》2011,11(4):57-60
以有限元方法为理论基础,借助于大型通用有限元软件ANSYS,利用Beam4单元及Shell63单元建立符合实际情况的框架模型,施加季节温差,并将混凝土收缩折算成温差作用,分析框架结构变形、梁柱内力、板中的应力大小和分布的变化规律,并提出混凝土框架结构设计建议。 相似文献
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针对辽宁省九五重点工程某水库碾压混凝土坝的整体规划与设计要求，有关设计与施工部门一起，提出了九个有关大坝施工和温度控制方案．本文针对各个方案的大坝升层填筑方式，坝址气温变化条件，混凝土各种时变特性（强度特性、蠕变特性、自生体积变形、添加剂氧化镁自身体积变形，弹性模量等），提出了较为复杂的计算模型，并采用有限单元法对大坝进行了非稳定温度场，温度应力，总应力的计算，研究了各种大坝温度控制方案优越点，提出最佳方案．经工程会议鉴定，计算成果正确，计算精度较高，为相关设计、施工单位采纳为施工招标，设计与施工的依据之一． 相似文献
10.
采用参考面单元技术并引入虚拟杆单元,建立筋条局部脱胶开裂复合材料梁／板结构后屈曲分析的有限元简化模型。着重研究不同开裂尺寸和位SLM置对复合材料层合加筋板后屈曲承载能力的影响。计算表明：开裂位置相同,开裂尺寸增加会导致后屈曲承载能力降低;开裂尺寸相同,随着其位置由筋条中心向端部移动,加筋板的后屈曲承载能力逐渐上升;值得注意的是,筋条端部开裂使加筋板的后屈曲承栽能力显著降低,其影响远大于筋条中心位置开裂。 相似文献
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This paper proposes a theoretical method using finite element analysis （FEA） to calculate the plastic collapse loads of pressure vessels under internal pressure, and compares the analytical methods according to three criteria stated in the ASME Boiler Pressure Vessel Code. First, a finite element technique using the arc-length algorithm and the restart analysis is developed to conduct the plastic collapse analysis of vessels, which includes the material and geometry non-linear properties of vessels. Second, as the mechanical properties of vessels are assumed to be elastic-perfectly plastic, the limit load analysis is performed by employing the Newton-Raphson algorithm, while the limit pressure of vessels is obtained by the twice-elastic-slope method and the tangent intersection method respectively to avoid excessive deformation. Finally, the elastic stress analysis under working pressure is conducted and the stress strength of vessels is checked by sorting the stress results. The results are compared with those obtained by experiments and other existing models. This work provides a reference for the selection of the failure criteria and the calculation of the plastic collapse load. 相似文献
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提供力学服务是永磁装置重要的用途之一,因而磁场力的计算是磁力在机械设计、应用的重要内容。本文介绍了公式算法的推导结果,通过公式法和ANSYS有限元分析两种方法对永磁铁样本进行磁场模拟计算,得到永磁体铁块的磁场特性和磁吸附力。最后通过实际测量永磁铁样本的磁感应强度验证了公式算法和有限元分析方式的合理性、可行性,分析了公式算法和有限元分析两种方式计算的磁力与实际磁场力的误差大小,并得到了永磁铁表面磁感应强度的变化规律。 相似文献
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结合龙滩碾压混凝土重力坝工程实例,模拟薄层浇筑时大坝的温度场变化,通过成层浇筑大体积混凝土的一维温度场计算对比分析,得出对类似工程设计和施工有益的建议,即可用有限单元法模拟成层浇筑混凝土温度场,与理论解差分解相结合,更好地应用到大体积混凝土施工过程的仿真计算中去。 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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The study of the interfacial and bond behaviour of reinforced cement-based materials is important for understanding the mechanical behaviour of such composites. This paper presents extensive experimental, theoretical and finite element analyses of pull-out tests of galvanised steel strips with different geometries, in lightweight cement-based material blocks with different densities and mechanical properties. The theoretical model proposed here is capable of determining the pull-out strength and bond stress versus the slip relationship between components of reinforced cement-based materials. This bond-slip relationship is then implemented in finite element simulation through the user-defined subroutine of ABAQUS software. Based on the results, a trilinear bond-slip model is suitable for modelling the interface between a steel strip and a cement-based material interface. 相似文献
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采用Ansys有限元软件对8根不同锈蚀率的FRP片材加固钢筋混凝土梁的受弯性能进行数值分析,研究纵筋锈蚀率对FRP加固梁的裂纹开展、破坏模式、承载能力以及延性和变形能力的影响.研究结果表明:低钢筋锈蚀率的梁发生受压区混凝土压碎破坏;中等锈蚀率的梁钢筋屈服后,钢筋与混凝土界面发生黏结滑移,最后FRP剥离破坏;高锈蚀率的梁钢筋没有达到屈服强度便发生黏结滑移,最后发生受压区混凝土压碎破坏.钢筋锈蚀越严重,FRP加固钢筋混凝土梁的承载力降低得越多.试件RCB-1(锈蚀率为0)的承载力为115 kN,而试件RCB-7(锈蚀率为20%)的承载力仅为42 kN.与FRP加固未锈蚀的钢筋混凝土梁相比,FRP加固锈蚀钢筋混凝土梁的变形能力较高.试件RCB-1和试件RCB-7的最大跨中挠度分别为20 mm和35 mm,而试件RCB-5(锈蚀率为10%)的最大跨中挠度达到了60 mm. 相似文献
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采用ABAQUS有限元软件对各种强度等级下各龄期钢筋混凝土梁的受扭性能进行分析。各龄期混凝土的本构关系采用塑性损伤模型,受拉指标采用断裂能。有限元分析结果表明:各龄期混凝土的抗扭承载力随龄期的增长而增长,开裂前早龄期混凝土梁的抗扭承载力主要由混凝土承担,钢筋的贡献很小;前3d是混凝土扭矩增长最快的主要时间段,开裂扭矩和极限扭矩达到28 d的60%左右。最后,根据有限元参数分析结果,在现行规范的基础上提出了早龄期混凝土梁开裂扭矩和极限扭矩的修正公式。 相似文献
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为了对处于环境温、湿度中的混凝土的收缩变形进行有效数值模拟分析,提出了一种数值解析与有限元分析相结合的方法.根据多孔介质热质传输原理描述混凝土中湿热迁移过程的耦合偏微分方程组,借助Laplace变换及传递函数将其简化为拉氏域内的简单微分方程并求解,然后通过Laplace逆变换得到物理空间内的温度和含湿量.在此基础上利用有限元分析方法得到混凝土湿热耦合收缩变形.该方法克服了其他求解过程中特征值复杂、耦合困难及准确性差的问题,并有效解决了现有有限元软件难以处理湿度应力及变形的难题.以Hundt试验为算例的数值计算表明,模拟结果与试验数据具有良好的相关性. 相似文献
19.
Yi-feng Wu Hao Wang Ai-qun Li Dong-ming Feng Ben Sha Yu-ping Zhang 《浙江大学学报(A卷英文版)》2017,18(5):363-376
Based on the explicit finite element (FE) software ANSYS/LS-DYNA, the FE model for a sliding lead rubber bearing (SLRB) is developed. The design parameters of the laminated steel, including thickness, density, and Young’s modulus, are modified to greatly enlarge the time step size of the model. Three types of contact relations in ANSYS/LS-DYNA are employed to analyze all the contact relations existing in the bearing. Then numerical simulations of the compression tests and a series of correlation tests on compression-shear properties for the bearing are conducted, and the numerical results are further verified by experimental and theoretical ones. Results show that the developed FE model is capable of reproducing the vertical stiffness and the particular hysteresis behavior of the bearing. The shear stresses of the intermediate rubber layer obtained from the numerical simulation agree well with the theoretical results. Moreover, it is observed from the numerical simulation that the lead cylinder undergoes plastic deformation even if no additional lateral load is applied, and an extremely large plastic deformation when a shear displacement of 115 mm is applied. Furthermore, compared with the implicit analysis, the computational cost of the explicit analysis is much more acceptable. Therefore, it can be concluded that the proposed modeling method for the SLRB is accurate and practical. 相似文献
20.
采用有限元分析方法考察梁和柱的截面尺寸、角型连接件尺寸、铆钉直径及端距等对节点性能的影响,根据计算得到的弯矩-转角曲线拟合出三参数模型中形状系数n 值的近似计算公式。结果表明,柱翼缘厚度和角型件厚度对节点初始刚度和极限承载力影响显著,梁高和铆钉端距的影响次之。形状系数建议公式计算结果与试验结果吻合较好,可为该类连接节点设计方法提供理论依据。 相似文献