钢框架-冷弯薄壁型钢组合墙体结构抗震性能有限元分析

利用有限元软件ABAQUS对纯钢框架试件、冷弯薄壁型钢组合墙体试件、钢框架-冷弯薄壁型钢组合墙体试件、覆双面OSB板的钢框架-冷弯薄壁型钢组合墙体试件进行水平低周往复荷载作用下研究,分析了试件的滞回曲线、骨架曲线、抗侧刚度、延性和耗能等。结果表明,钢框架与冷弯薄壁型钢组合墙体有明显的组合效应;冷弯薄壁型钢组合墙体能明显增强钢框架结构的承载力、刚度、延性和耗能能力;覆双面OSB板钢框架-冷弯薄壁型钢组合墙体结构抗震性能较不覆板的钢框架-冷弯薄壁型钢组合墙体结构抗震性能好。     

Pseudo-dynamic testing of a fabricated composite frame with steel plate shear walls

A pseudo-dynamic testing program was generated on a fabricated composite frame with steel plate shear walls (SPSWs) to study its seismic performance. The specimen was a three-storey single-bay frame, which was composed of H-section steel columns and composite beams, and was assembled by bolted height-adjustable steel beam-to-column connections (BHA connections). Beam-only-connected SPSWs were selected as lateral load resisting members. The specimen was subjected to four ground motions of progressively increasing intensity. The results showed that: (1) beam-only-connected SPSWs provided sufficient lateral load resistance, lateral stiffness, and energy dissipation capacity to the fabricated frame via the tension field action developed in their infill panels; (2) the fabricated frame, assembled by BHA connections, exhibited substantial redundancy and good ductility; (3) an undesirable failure mode of the fabricated frame, in huge earthquakes, included severe cracking in composite beams and block shear failure in SPSWs’ connections; (4) the inter-storey shear force distribution determined by ASCE/SEI 7-10 was verified with experimental data.     

带可恢复功能节点的装配式框架结构抗震性能

为实现装配式结构震损后能快速修复以恢复使用功能,提出一种带可恢复功能节点的装配式框架结构体系。利用ABAQUS 有限元软件对可恢复功能节点进行数值模拟,探讨可恢复功能节点的作用机理,并将可恢复功能节点布置到装配式框架结构中形成可恢复功能装配式框架结构,考察整体结构的受力机理,可更换耗能铰、装配式节点核心区与梁柱部件的失效演化规律。结果表明,节点的失效主要是由于可恢复功能节点在削弱钢板处的损伤累积引起的断裂导致?与现浇混凝土框架及节点加强型现浇混凝土框架相比,可恢复功能装配式框架的承载能力更高、延性更好,通过可更换耗能铰的塑性变形耗散能量大幅度提高了结构的耗能能力,且结构的损伤破坏集中在削弱钢板上,有效地避免了预制梁柱和节点核心区的损伤。震后通过更换损伤耗能元件即可恢复结构的使用功能,实现了损伤可控和震后功能可恢复的抗震设防理念,具有广泛的应用前景。     

仙游县后井水库溢洪道修复工程设计

分析后井水库溢洪道水毁原因,阐述溢洪道修复工程中泄槽设计采用多次纵向变坡,消能采用多级消力池及增加矩形条加糙陡槽消能,获得了良好的效果。     

底流消能综合式消力池挖深深度计算探讨简

底流消能是借助于一定的工程措施控制水跃位置,通过水跃发生的表面旋滚和强烈紊动来消除余能．底流消能综合式消力池适当降低护坦的高程,同时又修建不太高的消能坎,是一种造价经济的消力池．文章应用不同计算方法计算了综合式消力池的挖深深度和消能坎高度．将结果对比分析发现：采用能量方程的计算方法得出的消力池深度比较合适．而采用由动量方程得出的计算方法所得结果偏小33．5％．最后从原理上分析了由动量方程得出的计算方法计算结果偏小的原因．建议消力池挖深深度的计算采用能量方程得出的方法．     

弹性力学中混合变量的极值变分原理

本文建立了弹性力学空间问题混合变量的最小势能原理和最小余能原理，并根据该最小势能原理给出了弯曲薄板混合变量的最小势能原理。应用该势能原理计算了一复杂边界条件矩形板的弯曲。     

端板螺栓连接混凝土柱—蜂窝钢梁节点延性及耗能研究

为研究焊接环式箍筋柱与焊接蜂窝梁连接节点的破坏特征和抗震性能,进行了2个外伸式端板连接节点、2个平齐式端板连接节点的低周反复荷载试验,分析了各节点的破坏形态、承载力、延性、耗能性能、刚度退化等。试验结果表明:外伸式端板螺栓连接型试件的承载力最高,延性最好,耗能能力较强,但在极限荷载之后出现严重的刚度退化。     

钢筋锈蚀对再生混凝土梁柱节点抗震性能的影响

为研究钢筋锈蚀后再生混凝土框架节点的破坏特征和抗震性能,对钢筋未锈蚀、锈蚀而保护层未开裂、平均锈胀裂缝宽度为0．2mm及平均锈胀裂缝宽度为0．4mm四种情况下的再生混凝土及普通混凝土框架边节点,进行了低周反复荷载对比试验;观察节点的受力过程及破坏形态,分析试件的荷载一位移滞回曲线、承载能力、强度和刚度退化、延性以及耗能能力等力学特性．结果表明：相同锈蚀程度下,再生混凝土节点的强度比普通混凝土节点小,再生混凝土节点的刚度退化比普通混凝土节点严重,再生混凝土节点表现出更好的延性,再生混凝土耗能较普通混凝土耗能弱;随着钢筋锈蚀程度的增加,再生混凝土与普通混凝土节点的强度降低,刚度减小,延性减小,耗能能力降低．     

Ultimate load capacity and reinforcement of circular-hollow-section N-joint

Experimental research and numerical analysis were applied to study the ultimate load capacity(ULC) and reinforcement of circular-hollow-section N-joint.Four specimens were tested under static load.The ULC of each specimen was obtained and the detailed failure conditions were discussed.Based on the results, both welding a plate on the chord member and filling concrete in the chord member are effective to reinforce the N-joint, but it is suggested that these two methods should not be applied simultaneously.Mo...     

Three-dimensional analysis of a thick FGM rectangular plate in thermal environment

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应用大挠度薄板功的互等定理求解四边固定矩形板的挠曲方程

应用大挠度弯曲薄板的第二类功的互等定理,求解均载四边固定大挠度弯曲矩形板的挠曲面方程。     

Three-dimensional analysis of a thick FGM rectangular plate in thermal environment

The thermal behavior of a thick transversely isotropic FGM rectangular plate was investigated within the scope of three-dimensional elasticity. Noticing many FGMs may have temperature-dependent properties, the material constants were further considered as functions of temperature. A solution method based on state-space formulations with a laminate approximate model was proposed. For a thin plate, the method was clarified by comparison with the thin plate theory. The influences of material inhomogeneity and temperature-dependent characteristics were finally discussed, through numerical examples. Project (No. 10002016) supported by National Natural Science Foundation of China     

Bifurcation and chaos of a 4-side fixed rectangular thin plate in electromagnetic and mechanical fields

We studied the problem of bifurcation and chaos in a 4-side fixed rectangular thin plate in electromagnetic and mechanical fields. Based on the basic nonlinear electro-magneto-elastic motion equations for a rectangular thin plate and the expressions of electromagnetic forces, the vibration equations are derived for the mechanical loading in a steady transverse magnetic field. Using the Melnikov function method, the criteria are obtained for chaos motion to exist as demonstrated by the Smale horseshoe mapping. The vibration equations are solved numerically by a fourth-order Runge-Kutta method. Its bifurcation diagram, Lyapunov exponent diagram, displacement wave diagram, phase diagram and Poincare section diagram are obtained.     

应用大挠度薄板功的互等定理求解一对边固定一对边自由的矩形薄板

应用大挠度弯曲薄板的第二类功的互等定理，求解均载一对边固定一对边自由大挠度弯曲矩形板的挠曲面方程。     

Winkler地基上四边自由矩形薄板的1/3次亚谐共振与混沌分析

研究Winkler地基上四边自由矩形薄板的复杂运动,按照弹性力学理论建立Winkler地基上四边自由受简谐激励作用矩形薄板的动力学方程;利用Galerkin方法将其转化为非线性振动方程;应用非线性振动的多尺度法求得了系统满足1/3次亚谐共振情况时的一次近似解,并进行数值计算;分析激励、调谐值、阻尼等对系统响应曲线的影响;应用Floquet理论分析了系统的稳定性问题;应用Melnikov方法得到了系统可能产生混沌运动的条件。     

磁场中矩形薄板的非线性内共振响应

给出了横向磁场作用下矩形薄板的磁弹性振动方程,针对一边固定、三边简支的矩形薄板,通过位移模态展开,并利用Galerkin法得到两自由度内共振非线性振动微分方程组。算例分析中,利用数值方法得到了系统内共振时两阶模态的时间历程响应图和相平面图,并分别讨论了系统初值及磁场强度对系统振动的影响。结果表明,系统呈现明显的非线性内共振特征。     

变厚度矩形薄板弯曲问题的DQ法研究

针对矩形薄板的线性挠曲控制微分方程及其边界条件,在空间域采用DQ法离散,得到以板各节点弯曲挠度为全部待定参数的线性方程组,只需一次求解该方程组即得到各节点的弯曲挠度,再由高阶Lagrange插值得到薄板全域内的任意点挠度。     

对边固支另两边简支矩形薄板弯曲问题的哈密顿方法

利用哈密顿体系以及辛几何中的分离变量和本征函数展开的方法,给出了求解对边固支另两边简支的矩形薄板弯曲问题的方法,并通过实例计算和分析说明了该方法的正确性.     

部分覆盖被动约束层阻尼板的动力特性分析

由薄板的基本方程出发,考虑粘弹性层与基板、约束层间的法向和切向相互作用力的影响,导出部分带状覆盖被动约束层阻尼（Passive Constrained Layer Damping,PCLD）板在两端简支另两端任意边界情况下的一阶常微分矩阵方程,方程的状态向量由4个独立的位移变量和内力变量组成,可方便地应用于位移和应力边界条件。同时,利用精细积分法和传递矩阵原理求解特征方程,计算了多种情况下PCLD板的固有频率和损耗因子。通过与参考文献结果相比,验证了本文方法的正确性。最后,分析了覆盖位置和覆盖率对结构减振特性的影响。     

浅谈语言表达和文化之间的联系

语言与文化相互依赖、相互影响。语言是文化的重要载体；文化对语言有制约作用。本文对语言的内在系统，从语言的形式和结构上作了分析，并对语言的社会功能和其它外在因素进行了探讨。