基于MATLAB的有限元结构分析

利用MATLAB易于编程和矩阵高效计算等优点,可使有限元的结构分析得以实现。结合平面桁架结构实例及平面刚架结构实例,编写相应的M函数文件,求得节点位移和反力,并绘出单元的内力图。结果表明,此方法简便、高效、实用。     

受腐蚀结构发生塑性内力重分布的过程分析

简要分析了在化工环境下，受腐蚀结构发生塑性内力重分布后的荷载效应变化情况，为化工环境下的结构设计充分利用塑性提供了可能。     

钢箱梁桥顶推施工中下部结构受力性能优化分析

文章以某钢箱梁桥中使用顶推施工技术为例,从顶推工作平台设置、顶推用临时支墩设置等具体工序对钢箱梁顶推施工技术进行了探讨,对顶推法施工中各项支点的受力情况进行了计算和分析,从而为顶推施工的顺利进行创造了良好条件。     

基于土木工程建筑中混凝土结构的施工技术分析

我国社会经济的发展促进了土木工程业的发展,人们对土木工程的质量要求越来越高,同时对建筑物的美学观念和安全需求也越来越明确。混凝土材料作为土木工程中最重要的原材料,其结构的施工技术直接决定着混凝土在土木工程建筑中能否发挥最大作用。本文对土木工程和土木工程中的混凝土做了简单介绍,根据混凝土的基本性质进行分析,探究了混凝土结构的施工技术。     

用有限元和近似法对弹性支承的圆库仓底结构进行内力分析

将某工程实例的桩基础作为弹性支承,用有限元法与近似方法对仓底结构进行了分析比较,认为对较复杂的仓底结构计算,用传统的近似法与实际情况有较大出入,应采用有限元法计算。     

建筑工程中大体积混凝土结构施工分析

社会经济的发展加速了城市化建设的进程,一方面直接改善了人们的物质生活水平,另一方面使得经济建设与土地资源的矛盾愈发尖锐,直接导致高层建筑成为当下建筑行业的主要发展趋势。要提升高层建筑的整体安全性与稳定性,则离不开大体积混凝土结构施工技术的科学应用。只有保障建筑工程中大体积混凝土结构施工的整体质量,才能为建筑工程项目整体质量的把控提供良好的基础条件。本文针对建筑工程中大体积混凝土结构施工的相关情况进行了详细地分析,以期从本质上提升大体积混凝土结构施工的效率与质量。     

矩形顶管管节内力变化及地表沉降规律分析

为了研究矩形顶管施工过程中管节内力变化规律及施工过程中地表沉降规律,以昆明轨道交通4号线菊华站B号出入口为研究对象,在管节间安装土压力盒,监测顶管施工时管节内力变化;在地表设置沉降监测点,监测顶管施工中地表沉降情况。监测分析结果表明：掌子面前方地表上浮,掌子面后方地表下沉;顶管轴线处位移大于顶管两侧位移;顶管纠偏操作会影响地表沉降规律;管节内力在截面表现为管节外侧内力大于内侧内力,同时表现出管节底部内力大于顶部内力,顶部内力大于两侧内力。     

型钢混凝土组合结构施工要点分析

型钢混凝土结构是我国建筑行业内常见的施工结构,它通过在钢筋混凝土中按需求加入型钢结构,来实现改善结构刚度,提高抗震性能和承载能力的效果。另外,钢结构由于其较好的防火性能和较高的稳定性,相对于普通结构在建筑行业中得到了更为广泛的应用。经过多年的使用和改进,该技术对钢材的用量需求已经大大减少。本文主要探讨型钢混凝土组合结构的使用情况,研究与其相关的施工技术。     

框架内力估算

土木结构内力计算的方法存在两大发展趋势 ,更精确的非线性有限元计算和快速简捷的解析估算 ,两者有着不同的应用范围。针对建筑结构中常见的框架结构 ,根据力学的基本平衡原理 ,引入一支座固定程度系数 R,提出了一种非常简便、精度可满足工程要求的估算框架内力的新方法 ,该方法同时适用于直梁框架和曲梁框架 ,可供有关人员在方案初步设计和工程现场使用。     

全钢载重子午线轮胎带束层帘线受力的有限元分析

建立11.00R20规格全钢载重子午线轮胎结构力学分析的二维和三维有限元模型,模型考虑了轮胎分析中因大变形而产生的几何非线性和材料非线性问题及轮胎与轮辋和路面的接触问题.采用ABAQUS软件对轮胎模型的装配与充气过程和轮胎在静负荷条件下带束层帘线的受力情况进行了分析,得到的各层带束层受力结果可帮助轮胎结构工程师评价带束层的设计方案.     

橡胶止水带受力状态下的有限元分析

应用大型有限元分析软件ANSYS,建立了橡胶止水带于混凝土中在不同受力形式下的有限元模型,分析了在各种不同工况下止水带变形及应力的分布,描述了其可能出现裂纹的位置。通过分析计算得出,当止水带在混凝土中受力而产生应力时,对止水带伸缩性起主要作用的是中心孔的横梁结构,此部位承受了较大的应力。与此同时,计算得出在各种工况下止水带所受最大应力以及止水带中心孔横梁结构中心节点的最大反力。分析了各种工况下最大应力与位移的关系,以及止水带中心孔横梁结构中心节点反力与位移的关系。为止水带的设计、生产、安装及模型优化提供了依据。     

The performance of adhesive-bonded thin-gauge sheet-metal structures with particular reference to box-section beams

In an effort to reduce vehicle weight, the automotive industry is developing car body structures made from light-weight materials such as composites, plastics and aluminium alloys. Fabrication of these materials using traditional welding techniques is not feasible and adhesive bonding is now being investigated as a potential assembly method. To assess performance characteristics of bonded vehicles, thin-gauge sheet-metal box-section beams have been used to simulate structural details in automotive applications such as car bodies and commercial vehicles. Beams were fabricated from flanged strips by different joining methods to form box-section structures approximately $\text{1}\text{m long}\text{× 60}\text{mm square}$. Tests were carried out to determine torsinal and flexural rigidity and ultimate torsional and flexural strengths, and in the majority of tests, bonded structures gave better characteristics than the equivalent riveted or spot-welded beams. The failures of beams under 3-point bending have been related to buckling of the side webs and further experimental tests have shown that collapse is critically dependent on flange-bends radius. Finite element techniques have veen used to analyse stress distribution in the beam section and this confirms the experimental observations of beam collapse.     

含随机裂纹结构的弹塑性断裂分析

压力容器的失效大多为弹塑性断裂失效 ,CEGBR6、PD64 93、SAPV95等规范都采用J积分参量进行断裂评价。开展了裂纹尺寸为随机变量时的弹塑性断裂分析 ,讨论了弹塑性的随机平衡微分方程和J积分随机分析方法 ,推导了裂纹尺寸对 [B]矩阵和 [Dep]矩阵的影响。编制了弹塑性随机有限元程序 ,并采用数值方法进行了验证。结果表明 ,与Morte carlo方法相比误差为 1 0 5 %。     

Failure and stress analysis of internal pressurized composite pipes joined with sleeves

Failure and stress analyses were carried out for composite pipes adhesively joined with sleeves subjected to internal pressure. In the study, the composite pipes and sleeves were E glass fiber/epoxy with different fiber orientation angles. Circular pieces cut from four layered composite pipes with different orientation angle were used as sleeves. Composite pipes with different orientation angle were bonded using DP410 and DP490 type adhesives. The codes of a numerical model were generated via ANSYS software package for the numerical analyses, and the numerical results were verified using experimental results. The problems were analyzed by using a calculation method based on finite elements method (FEM). The finite element analyses (FEA) were carried out to predict the failure internal pressure. Radial, tangential, axial and shear stress values were obtained via numerical analyses for composite pipes and adhesive layers in the thickness direction. In addition, Von–Mises stress distributions that develop on the adhesive were obtained as well. The effects of orientation angle, sleeve length and adhesive type on strength of composite pipe and bonded zone were examined. The results showed that the adhesive type has higher effect on the strength of bonded composite pipes when compared with orientation angle and sleeve length. In addition, increase in sleeve length increased the failure internal pressure.     

约束阻尼处理梁的有限元解法

提出了一种整体划分单元的有限元法来建立两种约束阻尼梁的有限元模型，根据阻尼结构的变形能原理推导得出了其刚度阵和质量阵。通过一个算例证实了本法可提高运算速度和计算精度．     

气相色谱内标法测定O,O-二甲基硫代磷酰胺含量

建立了以苯甲酸乙酯为内标物,气相色谱内标法定量测定O,O-二甲基硫代磷酰胺含量的新方法。线性回归方程y=0.6837x+0.0186,相关系数r为0.9994,加标回收率达到96.28％,相对标准偏差为1.09％。该方法简便、准确、可靠,适用于O,O-二甲基硫代磷酰胺的质量检验。     

Screw-generated forces in granular media: Experimental,computational, and analytical comparison

This study presents an experimental, computational, and analytical comparison of a submerged, double-helix Archimedes screw generating propulsive force against a bed of glass beads. Three screws of different pitch lengths were studied. Each screw was tested at six speeds in approximately 10 trials for a total of 180 experimental trials. These experiments were then replicated in EDEM, a discrete element method (DEM) software program. DEM simulation results for thrust forces in the 30–120 rpm regime had a 5%–20% inflation of forces compared to experimental results. These simulations were then compared with resistive force theory (RFT) plate approximation of the screw geometries. We analyze a superposition-based partition approach to the full-length screws as well as force generation in shortened, one- and two-blade screws. We find that the force generation is dependent on the flow patterns and cannot be reduced to partitioned approximations as with simple intruders. © 2018 American Institute of Chemical Engineers AIChE J, 65: 894–903, 2019     

内外施焊接管焊接接头应力的有限元分析

应用Ansys有限元应力分析软件,根据钢制化工容器结构设计规定(HG20583-1998),分别建立了内部施焊和外部施焊的内伸入式接管与壳体间焊接接头的模型,分析了焊接接头处应力分布情况,并对焊接接头处的应力进行了对比。结果表明,内部施焊的整个焊缝X方向的应力平均值大于外部施焊焊缝;外部施焊的整个焊缝Y方向应力水平略大于内部施焊焊缝;内部施焊焊缝等效应力的应力值小,但其高应力区域范围较大。