共查询到19条相似文献,搜索用时 906 毫秒
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徐州某建筑结构的动力特性及地震反应分析 总被引:1,自引:1,他引:0
本文运用有限元分析软件对一高层建筑进行结构动力特性分析,建立高层建筑结构的三维计算模型,计算了该建筑物的固有特性;并采用时程分析法进行了地震反应分析,分别计算了四种地震波作用下顶层水平位移的时程曲线、水平位移沿楼高的分布曲线以及顶层加速度的时程曲线。计算结果表明,利用ANSYS软件建立三维模型,能较好的进行结构的抗震分析,并且为抗震设计人员提供可靠的依据。 相似文献
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实际边坡动力稳定性受地震竖向与水平方向效应共同作用,传统边坡地震永久位移计算方法较少考虑竖向地震波影响,采用实际地震的竖向与水平方向加速度时程曲线共同效应更符合工程实际。基于极限分析上限法和Newmark刚塑性滑块模型,提出一种基于实际水平向与竖向地震加速度时程曲线的边坡永久位移计算改进方法,以3个工程边坡为例,探讨了两组具有代表性实测典型水平和竖向地震地面运动记录对边坡地震永久位移计算的影响。研究结果表明:不考虑竖向地震加速度时程曲线时,本文方法可蜕化为与前人方法兼容;不同地震波的竖向与水平地震动时程曲线的叠加效应不同,竖向地震对边坡永久位移的影响不可忽略。 相似文献
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以某大跨度斜拉桥为背景,利用大型通用有限元分析软件ANSYS建立了计算仿真模型,采用分块Lanczos法得到了该斜拉桥结构的自振特性。在频域地震作用下,分别采用反应谱法和动力时程分析法对该斜拉桥在纵+竖向、横+竖向、纵+横+竖向激励作用下的地震响应进行了对比分析。分析结果表明:纵向地震激励对结构响应影响较为明显;由反应谱法计算得出的结果较动力时程分析法偏大,在弹性阶段反应谱分析结果是比较保守安全的。 相似文献
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以某超长大型步行天桥的抗震分析为例,在上部结构分析中引入了地基基础刚度。采用弹性时程和弹塑性时程等方法分析比较了固定约束、线性弹簧约束、非线性弹簧约束等不同模型在地震下的响应。计算表明引入基础刚度后,上部结构的动力特性发生变化,柱分担的地震剪力比例上升,墙的比例下降。在大震弹塑性时程分析中,基础的非线性变形起到了耗能作用,削弱了上部结构的地震响应。 相似文献
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《建筑结构》2014,(20)
中海油能源开发研究院项目为弱连接四塔连体结构,存在扭转不规则、凹凸不规则、楼板不连续、竖向抗侧力构件不连续、大跨连体多项超限。介绍了设计中所采取的针对超限的计算及构造措施;采用两个不同力学模型的空间分析程序进行多遇地震、设防烈度地震、罕遇地震下的对比计算分析,详细对比了单塔模型和四塔连体整体模型的计算结果;大跨连接体两端均采用弹性滑动支座与主体结构相连,以减小地震作用下连接体刚度与质量对主体结构的影响;采用罕遇地震时程分析校核以多遇地震为基础计算的罕遇地震等效支座位移,进行支座设计;同时针对结构中不同的薄弱部位做了相应的局部分析,采取了对应的补强措施。 相似文献
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本文介绍了广州新白云国际机场航站楼结构分析的四个关键技术问题,并对前三个关键技术问题进行了非线性有限元分析。四个关键问题是:主楼结构整体稳定性、连接楼结构整体稳定性、膜张拉对结构的影响以及梭形钢格构柱稳定极限承载力的确定。有限元分析结果表明,主楼三角形桁架屋盖的侧向稳定性较低,需加强屋面压型钢板的抗剪刚度以提高其稳定承载力。应用本文提出的膜简化计算模型有效地分析了刚性骨架支撑的张拉膜结构,本文同时对钢桁架下弦端部实心棒节点进行了弹塑性分析。 相似文献
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复采采场再生顶板结构及支架载荷确定 总被引:1,自引:0,他引:1
为确定复采采场支架的合理承载,通过理论计算、现场观测和顶板结构探测得到了复采再生顶板的结构分带特征,建立了再生顶板结构模型;基于该结构模型,结合现场观测和相似材料模拟实验,构建了下分层回采"支架–再生顶板"结构力学模型,应用该力学模型推导了支架载荷表达式,并进行了实例计算和现场验证。结果表明,再生顶板结构可分为"四带",即胶结再生带、弱胶结压实带、裂隙带和弯曲下沉带;再生顶板下回采下分层时,支架承载岩体可分为"两区",即完全承载区(A区)和部分承载区(B区);应用所推导的支架载荷表达式进行了实例计算,计算结果得到了现场支架载荷监测数据的验证。 相似文献
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本文介绍了2008年奥运会乒乓球比赛馆———北京大学体育馆预应力桁架壳体钢屋盖结构分析的三个关键问题:初始态预应力度的确定、地震作用下屋盖的地震响应分析以及屋盖的极限承载力分析。所有问题均采用非线性有限元分析,其中屋盖的极限承载力采用弹塑性非线性有限元进行分析,同时考虑了几何非线性和滑动支座滑动引起的支承条件的非线性变化。分析结果表明,预应力拉索和滑动支座的积极应用,使屋盖结构成为自平衡体系,提高了屋盖结构的效率,减小了下部支承结构的设计难度;屋盖的极限承载力取决于支座立柱、中央刚性环和屋盖支撑的强度和刚度。 相似文献
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Light-frame wood roofs are frequently used in the US for residential and commercial construction. High wind events, such as hurricanes, may cause severe damage to these structures by breaking the roof envelope and allowing penetration of wind-driven rain. Most previous wood panel reliability studies have used static, uniform wind pressure load models and code-specified load distribution rules for analysis. This study re-estimates the reliability of roof sheathing panels exposed to a specific hurricane event using actual wind pressure data and a more refined structural analysis model. The objective is to examine the adequacy of the simplified wind load and structural analysis models used for roof panel reliability analysis. In the procedure here, panel failure behavior is modeled by individual fastener extraction from the panel as dynamic wind pressure is increased. For reliability analysis, the limit state is based on panel pull-off. The results show that the use of a refined model provides some significant differences in panel reliability found from simplified techniques. 相似文献
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深圳大运中心体育馆整体钢屋盖由周边的单层折面网壳与中央圆顶构成。为了了解这一结构体系的受力特点,揭示结构的薄弱环节和破坏模式,验证有限元分析的建模策略,开展了1∶10缩尺的模型试验研究。介绍了该结构的受力特点、试验方案设计和理论分析假定,将试验结果与理论分析结果进行了对比,并对试验过程中的现象进行了深入分析。研究结果表明:结构在设计荷载工况组合下的响应基本保持线弹性,位移和内力实测值与计算值吻合较好;竖向荷载作用下,穹顶作用对单层折面网壳和中央圆顶的受力特性都有较为显著的影响。极限阶段的加载试验表明,环向拉杆对整体结构的受力起到较为重要的作用,而一根环向拉杆的断裂将致使传力路径的改变,从而导致较为不利的破坏现象。 相似文献
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The Guangzhou International Convention & Exhibition Center (GICEC) with roof dimensions of 210 m wide and 457 m long is the largest exhibition center in Asia and the 2nd largest of this kind in the world. This paper presents results from a combined study of wind tunnel test, full-scale measurement, and numerical analysis of wind effects on the long-span beam string roof structure. In the wind tunnel test, wind-induced pressures including mean and fluctuating components were measured from the roof of a 1:300 scale GICEC model under suburban boundary layer wind flow configuration. The Proper Orthogonal Decomposition (POD) method and the quasi-steady approach as well as probability analysis were adopted to estimate the characteristics of the fluctuating wind pressures on the roof. On the other hand, full-scale measurements of wind actions and wind-induced structural responses of the roof were conducted during the passage of Typhoon Nuri. The field data such as wind speed, wind direction, and acceleration responses, etc., were continuously and simultaneously monitored from a wind and structural response monitoring system installed on the roof structure during the typhoon. Detailed analysis of the field data was performed to investigate the characteristics of the typhoon-generated wind and the wind-induced vibration of the long-span roof structure under typhoon condition. The dynamic characteristics of the roof were determined from the field measurements and comparisons with those calculated from the finite element model (FEM) of the structure were made. The damping ratios of the roof structure were estimated by means of the random decrement method and the amplitude-dependent damping characteristics were presented and discussed. Finally, the full-scale measurements were compared with the model test results to examine the accuracy of the wind tunnel test results and to identify possible modelling errors in the numerical study. The results presented in this paper are expected to be of considerable interest and of use to researchers and professionals involved in designing long-span roof structures. 相似文献