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针对某型车架满载时车身产生严重弯曲变形的问题,在有限元法的基础上,利用ANSYS软件建立车架三维有限元分析模型,并进行变形和应力计算机仿真分析,结合变形实验,得到车架变形及应力变化规律,找出了车架产生严重弯曲变形的原因,并对大梁截面尺寸进行优化,提出优化改进方案。 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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采用有限元分析软件ANSYS对网格框架墙体进行了数值模拟,并结合前期试验,进行了数值结果与试验结果的比较。比较分析认为ANSYS软件能够较好地模拟墙体内力和变形发展的全过程以及裂缝的形成与发展过程,可以满足实际工程实施与科学研究的精度要求。在此研究基础上,又对前期试验中没有涉及到的其他参数进行了模拟,从而完善了影响钢筋混凝土网格框架新型墙体抗震的其他因素。 相似文献
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基于有限元法对流固耦合作用下的刀具转速开展搅拌效果及受力变形分析。 在流体动力学分析中,采用示踪剂浓度法、多重参考系法研究转速对搅拌效果的影响。 将静力学和动力学模块进行连接搭建,研究不同转速下的刀具受力变形情况,获得搅拌叶片的安全转速取值范围。 结果表明:在达到临界转速前,所需混合时间对转速的变化敏感,搅拌桨的受力和变形也随转速的增加而增大;从流场、混合时间、应力和应变的角度综合考虑,搅拌转速设置为200 rpm 时综合指标更高。 相似文献
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The progressive collapse of steel frame structures under the blast load was investigated using LS-DYNA.The multi-material Eulerian and Lagrangian coupling algorithm was adopted.A fluid-structure coupling finite element model was established which consists of Lagrange element for simulating steel frame structures and concrete ground,multiple ALE element for simulating air and TNT explosive material.Numerical simulations of the blast pressure wave propagation,structural dynamic responses and deformation,and progressive collapse of a five-story steel frame structure in the event of an explosion near above ground were performed.The numerical analysis showed that the Lagrangian and Eulerian coupling algorithm gave good simulations of the shock wave propagation in the mediums and blast load effects on the structure.The columns subjected to blast load may collapse by shear yielding rather than by flexural deformation.The columns and joints of steel beam to column in the front steel frame structure generated enormous plastic deformation subjected to intensive blast waves,and columns lost carrying capacity,subsequently leading to the collapse of the whole structure.The approach coupling influence between structural deformation and fluid load well simulated the progressive collapse process of structures,and provided an effective tool for analyzing the collapse mechanism of the steel frame structure under blast load. 相似文献
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Numerical Simulation of Dynamic Response and Collapse for Steel Frame Structures Subjected to Blast Load 总被引：4，自引：0，他引：4
The progressive collapse of steel frame structures under the blast load was investigated using LS-DYNA. The multi-material Eulerian and Lagrangian coupling algorithm was adopted. A flu-id-structure coupling finite element model was established which consists of Lagrange element for simulating steel frame structures and concrete ground, multiple ALE element for simulating air and TNT explosive material. Numerical simulations of the blast pressure wave propagation, struc-tural dynamic responses and deformation, and progressive collapse of a five-story steel frame structure in the event of an explosion near above ground were performed. The numerical analysis showed that the Lagrangian and Eulerian coupling algorithm gave good simulations of the shock wave propagation in the mediums and blast load effects on the structure. The columns subjected to blast load may collapse by shear yielding rather than by flexural deformation. The columns and joints of steel beam to column in the front steel frame structure generated enormous plastic defor-mation subjected to intensive blast waves, and columns lost carrying capacity, subsequently lead-ing to the collapse of the whole structure. The approach coupling influence between struc-tural deformation and fluid load well simulated the progressive collapse process of structures, and provided an effective tool for analyzing the collapse mechanism of the steel frame structure under blast load. 相似文献
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介绍了桥式起重机主梁设计的计算方法及校核过程。应用有限元软件建立主梁三维模型,并针对主梁进行了静力学分析。为保障主梁结构的可靠性,将主梁与端梁装配成桥架,建立了桥架整体模型,并进行了静态分析和模态分析,在确认桥架设计合理的基础上提出了改进方案。 相似文献
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Theoretical Calculation and Analysis of Slip and Deformation for Concrete Sandwich Panels 总被引：1，自引：0，他引：1
Slip and deformation of concrete sandwich panels under uniformly distributed loads is concerned. The effect of slip on the deformation of concrete sandwich panels are studied,and the analytical expressions of slip and deformation for concrete sandwich panels is obtained. These formulae can describe the slip distribution and account for its effect on deformation. In order to restrict the bound of formula, the formula of crack moment is obtained. The results of theoretical calculation are compared with those of tests and finite element methods. The comparison shows that the results of theoretical calculation are in accord with those of tests and finite element methods. So the theoretical calculation can be used to calculate slip and deformation of concrete sandwich panels in practical projects. 相似文献
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以某沿海城市地铁车站结构为例,通过室内单桩竖向抗压静载试验,计算单桩极限侧阻力,理论验算和MIDAS 有限元软件数值模拟相结合,对比分析不同抗浮措施下车站结构底板位移、变形大小。 结果表明:围护结构法抗浮,车站底板竖向位移得到控制,但结构底板变形较大,底板水头高度为17.4 m 时,底板最大变形5.75 mm;抗浮锚杆和抗浮桩可有效减小结构底板变形,底板水头高度为17.4m 时,两种抗浮措施下底板最大变形分别为2.37 和2.04 mm;抗浮组合措施能够发挥各自优势,抗浮效果明显,对结构变形控制较好;排水减压法基于减小结构水浮力原理抗浮,抗浮效果显著。 相似文献
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大坝与坝基的稳定一直是工程师密切关注的一个安全问题. 论文提出2种分析重力坝和坝基稳定的方法: 一种是基于刚体极限平衡原理的直接分析方法, 它将坝体和岩基作为不变形的刚体, 利用该方法可直接计算出可能滑动面的安全因数; 另一种是基于弹塑性理论的间接分析方法, 它采用非线性有限元方法分析大坝和坝基的应力和变形. 根据收敛和突变准则来确定稳定安全度.结果表明:工程建筑物的破坏不仅仅是由于施加荷载的原因,同时也与组成材料的性质有关. 相似文献
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INTRODUCTION Damage detection of structures is very importantfor ensuring and evaluating the safety of structuresystems during their lifetime. The approaches de-veloped in this field may be generally classified intodynamic identification approach using dynamic testdata and static identification approach using static testdata (Wang et al., 2001). The dynamic identificationapproach has been highly developed, although severalinherent drawbacks and problems handicap the fullutilization o… 相似文献
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利用有限元分析软件ALGOR对平面框架进行竖向荷载作用下静力计算、动力模态及地震响应分析计算,并同手工计算方法进行了比较 如果计算的结构类型更为复杂,则有限元分析的优点更为突出 相似文献
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针对沉降计算的可靠性与方便性,提出了一种考虑三向变形的实用沉降计算方法。通过分析Skempton-Bjerrum沉降计算方法的不足,引入土体发生固结沉降时的三向变形效应,采用弹性力学理论,得出了考虑三向变形的沉降计算实用式。并用工程实例分析验证了该方法的可靠性。 相似文献
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本文采用三维杆系力学分析模型对钢结构框架进行分析,避免了传统的有限元方法要对构件大量划分网格进行计算而导致的计算自由度巨大,计算耗时的缺点。对于杆件单元,本文采用了一种变刚度的杆单元模型,建立了考虑塑性铰分布长度影响的构件单元刚度矩阵。在此基础上对经典的算例模型进行了静力全过程分析。 相似文献
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间接回指是指话语上下文中先行成分和照应成分之间没有直接指代关系的一种特殊回指形式。对间接回指的理解需要对其理解的认知过程进行分析。框架语义学作为一种认知语义学提供了对词汇意义的描写方法,其中的“框架”概念是一种对概念的认知组织形式。框架中一个概念元素可以激活概念中的其它概念元素。框架语义学对间接回指中指称确定和认知推理有较强的解释力。我们尝试运用F illmore提出的框架语义学对这种语言现象进行探讨。 相似文献
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提出了一种不修改通用有限元程序建立的随机有限元方法，即计算机随机产生多组零件尺寸，用通用有限元软件对每组数据进行计算，求出零件危险截面应力等。对应力数据进行检验，若应力服从正态分布、指教分布、威布尔分布、对教正态分布中任一种，强度可靠度可通过公式或数值积分得到。若应力分布不确定，则可靠度用Monte Carlo法求出。变形的可靠度用同样方法解决。用该方法编写的计算机程序，使形状复杂零件的可靠度计算成为可能。 相似文献
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ZHU Bin LEUNG A.Y.T. 《浙江大学学报(A卷英文版)》2006,7(8):1351-1357
INTRODUCTION Thin-walled structures have considerable tech-nological importance in many situations of engi-neering practice. The rotary and warping inertia terms should be considered in the analyses of thin-walled structures (Alwis and Wang, 1996), although it is difficult to obtain the analytical solutions of govern-ing differential equations, especially of thin-walled frame and spatial twisted structure. The finite element method (FEM) is widely used for vibration and sta-bility analy… 相似文献
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INTRODUCTION Steel framed structures are widely used in in-dustrial and commercial buildings. According to thedifferent lateral load resisting system, the steel framescan be mainly divided into four kinds (Fig.1a): themoment-resisting frame (MRF), concentricallybraced frame (CBF), eccentrically braced frame(EBF), and knee bracing frame (KBF). Fig.1b shows the difference in the lateral per-formances of the above frames that have similarstructural parameters. Although the MRF is an e… 相似文献
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在通用有限元程序MSC.MARC中加入基于纤维模型编制的THUFIBER程序和三维实体单元模型分别模拟钢筋混凝土桥墩和桥梁上部结构,建立了高墩大跨连续刚构桥的有限元模型。采用汶川地震记录,针对四川境内某一实际桥梁,分析了行波效应对其地震反应的影响。结果表明:波速较小时,行波效应对墩顶的位移有利。墩底是地震分析时的危险截面,行波效应对结构反应较为复杂,在某些截面上可能加大,也可能降低,在抗震设计时,应考虑行波效应的影响。 相似文献