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关键词： 塔筒   基础   风力机   动力特性   有限元  

摘要： 建立750kW风力机组塔筒-基础的有限元模型,采用分块Lanczos法对模型的模态进行了分析,在得到了模型的固有频率和振型的基础上,对风轮旋转诱发塔筒的共振进行了分析。研究结果表明,风轮旋转不会引起塔筒与风轮共振。

关键词： 机械制造技术基础   有限元仿真   金属切削过程   挤压过程  

摘要： 介绍了有限元软件ANSYS的基本功能和应用范围,以模拟金属的切削、挤压等过程为例,分析了有限元仿真模拟在机械制造技术基础课程教学中的应用。有限元仿真模拟应用于机械制造技术基础课程教学中,具有节约教学学时、提高教学质量等优点。

关键词： 共同作用   有限元分析   上部结构刚度   地基沉降   次生应力  

摘要： 本文以花都大运家园工程的基础设计为实例,采用有限元软件Abaqus对建筑上部结构与地基基础共同作用进行简化有限元分析,通过对比是否考虑上部结构刚度的地基沉降对上部结构的应力影响,从而得出经济、安全、合理的结构体系。

关键词： 钢包回转台基础   工况   有限元  

摘要： 冶金工程中的钢包回转台具有7个工作状态。其基础受力情况较复杂。对于这种设备基础的受力分析,采用有限元计算分析是一个较好的方法。

关键词： 构架式基础   GTSTRUDL软件   动力分析  

摘要： 主要介绍石油化工装置的离心式压缩机构架式基础的动力分析要点及规范[1]中的动力分析方法,重点利用有限元软件进行构架式基础动力分析。以某乙烯装置的裂解气压缩机的构架式基础为例,使用GTSTRUDL软件计算分析基础的自振频率、最大振动速度和最大振动位移,验证基础的动力特性满足规范的要求,并通过两种不同模型的动力分析结果比较,提出满足工程要求的简便动力分析方法。

关键词： 深水高桩基础   水平撞击   船舶   非线性有限元   桥梁  

摘要： 随着世界经济飞速发展,海、陆、空等各个领域的交通也越来越发达,而三者之中陆地和河海的交通交叉最多。近年来,因为船舶的撞击而发生的桥梁的坍塌事故频繁,人们越来越关注对于加大桥梁基础水平抗撞击力的研究,以求进一步完善桥梁船舶撞击的设计和评估要求。对深水高桩基础水平抗撞击力的非线性有限元计算方法进行了研究,实例计算分析大桥工程,并对比我国的规范设计思想下的计算方法,证明深水高桩基础水平抗撞击力的非线性有限元设计思路是切实可行的。

摘要： The necessity for a protecting guard for the popular ceramic matrix composites (CMCs) is getting a lot of attention from engine manufacturers and aerospace companies. The CMC has a weight advantage over standard metallic materials and more performance benefits. However, these materials undergo degradation that typically includes coating interface oxidation as opposed to moisture induced matrix which is generally seen at a higher temperature. Additionally, other factors such as residual stresses, coating process related flaws, and casting conditions may influence the degradation of their mechanical properties. These durability considerations are being addressed by introducing highly specialized form of environmental barrier coating (EBC) that is being developed and explored in particular for high temperature applications greater than 1100°C. As a result, a novel computational simulation approach is presented to predict life for EBC/CMC specimen using the finite element method augmented with progressive failure analysis (PFA) that included durability, damage tracking, and material degradation model. The life assessment is carried out using both micromechanics and macromechanics properties. The macromechanics properties yielded a more conservative life for the CMC specimen as compared to that obtained from the micromechanics with fiber and matrix properties as input.

关键词： 缆机基础   排架式结构   三维有限元   结构计算   位移   应力   配筋  

摘要： 观音岩水电站采用辐射式缆机进行坝体及厂房混凝土浇筑,其左岸缆机基础跨冲沟布置,为弥补地形缺陷及减少混凝土量,跨冲沟段采用排架式结构,最大高度29.5m,最大跨度70m。由于该结构为三维空间结构,无法简化成平面模型,结合缆机副车轮压分为垂向和水平向的荷载特点,须采用三维模型进行结构计算,以分析结构的位移及应力水平,并对高应力区进行配筋计算。目前,该结构已经过各项检验,运行良好。

关键词： Design   Raft footings   BS8110   Reliability   Finite Element Method (FEM)  

摘要： In this study, a FORTRAN-based reliability-based design program was developed for the design of raft footings based on the ultimate and serviceability design requirements of BS8110 (1997). The well-known analysis of plate on elastic foundation using displacement method of analysis was used in conjunction with the design point method. The design point method was adopted for designing to a pre-determined safety level, beta(T). Example of the design of a raft footing is included to demonstrate the simplicity of the procedure. It was found among other findings that there is a saving of about 64% of longitudinal reinforcement applied at the column face using the proposed method as compared with the BS8110 design method. Also, the depth of footing required using the proposed procedure was found to be 47% lower than in the deterministic method using BS8110. Also, considering a target safety index of 3.0 was found to be cheaper than considering a target safety index of 4.0 for the same loading, material and geometrical properties of the footing. It is therefore concluded that the proposed procedure is quite suitable for application.

关键词： 有限元   筏板   基础   设计  

摘要： 文主要就有限元方法在建筑工程筏板基础设计中的应用做了一些分析和探讨。