共查询到19条相似文献，搜索用时 147 毫秒
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关于“矩形截面偏心受压构件轴力——弯矩相关曲线分析”的探讨 总被引：1，自引：0，他引：1
在分析和总结了各种情况下钢筋混凝土矩形截面的偏心受压构件承载力N-M的相关曲线基础上,找出了给定截面尺寸、配筋和材料强度的偏压构件达到承载能力极限状态时所承担的数种Mu、Nu组合变化关系,并得出了当同一截面承受多种N、M内力组合时其最不利内力组合方式的确定方法及偏压构件在截面设计时设计图表的绘制,为设计计算提供了依据,同时也简化了计算。 相似文献
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通过圆形截面偏心受压构件强度验算程序设计实例,简要介绍了VisualBasic程序设计在桥梁结构计算中的运用,指出了其对实际工程利用的优势 相似文献
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本文通过对底部框架剪力墙-砌体结构采用ANSYS有限元软件进行建模,简化砌体结构的模型参数,然后进行模态分析,并在重力荷载和水平荷载作用下,采用时程分析法,对结构进行受力和变形分析,满足规范要求。 相似文献
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刘晓红 《洛阳工业高等专科学校学报》2005,15(4):27-29,82
根据轻骨料混凝土材料非线性的应力－应变关系，采用非线性分析的方法，对圆形截面的钢筋轻骨料混凝土偏心受压构件的正截面承载力做了全过程理论分析，建立了圆形截面偏心受压构件正截面承载力数值迭代的基本方程，同时也为简化计算方法提供了理论依据。 相似文献
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因为异形柱经常承受偏心受压加受扭的复杂受力,所以理论计算比较复杂。本研究使用有限元分析软件ABAQUS对T形截面型钢混凝土柱的抗扭性能进行了数值模拟分析,并考虑混凝土塑性发展探讨不同轴压比与钢骨率对型钢混凝土T形截面柱延性与抗扭承载力的影响。利用已有的实验数据,建立构件的受压有限元模型,通过对比荷载-位移曲线验证有限元材料本构的有效性。建立三组模型分析不同轴压比与钢骨率对构件抗扭力学性能的影响,为今后型钢混凝土异形柱的应用提供参考。 相似文献
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钱斌 《常熟理工学院学报》2007,21(8):31-34
利用龙格-库塔法求解了不同单摆构成的耦合摆的运动方程,分析了由两个不同质量的小球组合的耦合摆的运动情况;并根据数值解法的计算结果描绘了不同情况下耦合摆的振动曲线。与失调参数等于零时的振动模式相比,发现除了当初始角相同时振动情况保持不变外,失调参数不为零时的振动振幅、周期都随着失调参数的增加而增加,而且当初始相位角等值反相时,质量不变的小球的最大振幅增大,质量变化的小球基本保持同一最大振幅;当一个小球有初始相位角,另一个初始相位角为零时,振动情况与之相反。 相似文献
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工程实践中发现大量砌体结构出现裂缝，轻者影响美观，重者影响使用；因此对已开裂的砌体结构如何进行加固与处理显得非常迫切，本文针对砌体开裂提出了一些预防加固措施，同时也为施工和设计人员今后预防砌体开裂积累一些有益的经验。 相似文献
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To study the influence of slenderness on the axial compressive performance of autoclaved fly ash solid brick masonry columns, compression experiments were conducted on 12 samples of autoclaved fly ash solid brick masonry column and 4 samples of fired clay brick masonry column. The damage patterns and compressive performance were compared and analyzed. The experimental results indicate that the compressive bearing capacity decreases as slenderness increases from 3 to 18, and the compressive bearing capacity of the autoclaved fly ash solid brick masonry columns is lower than that of the fired clay brick masonry columns. The formulae for the axial compressive bearing capacity of autoclaved fly ash solid brick masonry columns were derived based on the experiments. The nonlinear FEA program ANSYS was adopted to simulate the behaviors of masonry columns. By comparing the simulation results and experimental results, it is shown that the simulation results agree well with the experimental ones. The rationality and applicability of the simulation results were verified. 相似文献
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通过制作多组试件对污水污泥页岩实心砖的轴心抗压性能进行试验,并和烧结粘土砖相对比,得出了污水污泥页岩实心砖砌体的轴心抗压强度指标值均高于相同等级条件的粘土实心砖砌体的轴心抗压强度值,为污水污泥页岩砖的实际应用提供了依据. 相似文献
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Numerical Derivation of Strain Rate Effects on Material Properties of Masonry with Solid Clay Bricks
In this paper, numerical method is used to study the strain rate effect on masonry materials. A typical unit of masonry is selected to serve as a representative volume element (RVE). Numerical model of RVE is established with detailed distinctive modeling of brick and mortar with their respective dynamic material properties obtained from laboratory tests. The behavior of brick and mortar are characterized by a dynamic damage model that accounts for rate-sensitive and pressuredependent properties of masonry materials. Dynamic loads of different loading rates are applied to RVE. The equivalent homogenized uniaxial compressive strength, threshold strain and elastic modulus in three directions of the masonry are derived from the simulated responses of the RVE. The strain rate effect on the masonry material with clay brick and mortar, such as the dynamic increase factor (DIF) of the ultimate strength and elastic modulus as a function of strain rate are derived from the numerical results. 相似文献
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对底部框剪砌体房屋地震作用产生裂缝的原因进行分析,提出了在检测过程中应综合考虑此类结构的刚度、强度和延性的方法,对房屋检测有相当的参考价值· 相似文献
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针对目前高烈度区多层砌体结构住宅存在的问题和粘土砖被淘汰,采用混凝土结构形式建造多层住宅成为住宅产业的发展方向。通过对各种混凝土结构形式的比较,得出短肢剪力墙结构是建造多层住宅的首选结构形式．并对短肢剪力墙结构设计中存在的一些问题进行了探讨,最后通过实例对多层短肢剪力墙进行了设计和计算．为在高烈度地区建造此类结构提供了设计参考。 相似文献
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Terrorist attacks using improvised explosive devices (lED) can result in unreinforced masonry (URM) wall collapse.Protecting URM wall from lED attack is very complicated.An effective solution to mitigate blast effects on URM wall is to retrofit URM walls with metallic foam sheets to absorb blast energy.However,mitigation of blast effects on metallic foam protected URM walls is currently in their infancy in the world.In this palaer,numerical models are used to simulate the performance of aluminum foam protected URM walls subjected to blast loads.A distinctive model,in which mortar and brick units of masonry are discritized individually,is used to model the performance of masonry and the contact between the masonry and steel face-sheet of aluminum foam is modelled using the interface element model.The aluminum foam is modelled by a nonlinear elastoplastic material model.The material models for masonry,aluminum foam and interface are then coded into a finite element program LS-DYNA3D to perform the numerical calculations of response and damage of aluminum foam protected URM walls under airblast loads.Discussion is made on the effectiveness of the aluminum foam protected system for URM wall against blast loads. 相似文献
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In this study, nine simplified short composite columns consisting of core CFST (concrete filled steel tube) of different diameters and outer reinforced concrete were constructed to study their compressive performance under axial or eccentric compression. The failure mode is characterized by the crush of the outer concrete. The bearing capacity increases at first and then decreases with further increase of the position coefficient. It can be concluded that position coefficient is an important structural parameter that has considerable influences on the ultimate bearing capacity of the composite columns. The outer concrete, steel tubes and longitudinal reinforcement are found to work in a cooperative manner under axial or eccentric compression when the position coefficient is about 0.5. An improved bearing capacity algorithm that takes the position coefficient into account has been proposed based on the experimental and simulation results and current technical specification in China. It has been proven to be precise and safe. 相似文献
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本文通过对多层砖混结构的震害进行分析,并根据砖混房屋结构特点,结合自身设计经验,提出在砖混房屋抗震设计中应注意的几个问题及采取的相应措施,对多层砌体房屋的抗震设计具有重要的指导意义。 相似文献