复合夹芯板大尺度燃烧性能试验方法

介绍德国、英国、ISO国际标准化组织关于复合夹芯板的大尺度燃烧性能试验方法,包括构件的耐火性能、屋顶外部防火性能及复合夹芯板建筑体的燃烧性能试验方法等,分析认为将复合夹芯板构建成建筑体,综合考察其防火性能更能代表实际应用情况.介绍我国复合夹芯板相关测试方法.     

钢—混凝土组合梁桥桥面板活载受力分析

依据国内外相关规范,采用有限元的方法计算了钢—混凝土组合梁桥桥面板活载的受力特性,并通过对计算结果的分析比较,得出了一些有意义的结论,为钢—混凝土组合梁桥桥面板的设计提供了参考借鉴。     

WZ结构夹芯墙板中心受压试验研究

对钢筋网架—混凝土组合结构夹芯墙板平面内中心受压进行了试验研究,分析了钢筋网架—混凝土组合结构夹芯墙板的中心受压性能、加载过程中钢筋及混凝土的应变、WZ夹芯墙板中心受压时的承载力、破坏形态,验证合厚度混凝土墙板模型成立.钢筋网架—混凝土夹芯板在中心受压时十分稳定,其承载力可以采用“合厚度混凝土墙板”模型公式计算.     

桥上板式轨道结构动力特性研究

采用有限元法,分析研究了一座采用板式无碴轨道的混凝土桥梁,当轨道结构的参数及行车速度发生变化时,桥梁和轨道结构响应力的变化,并得出了一些重要结论。     

Concrete panel thickness demand for the design of composite steel plate shear wall

Composite steel plate shear walls (C‐SPWs) are composed of an infill steel plate and reinforced concrete encasements. With an adequate thickness, the concrete encasement can effectively prevent the premature buckling of the infill steel plate. Researchers have provided nonconservative concrete thickness demands through analyses of approximate elastic buckling, for which the analytical model is too simplistic to simulate C‐SPW buckling. In this paper, the buckling of C‐SPW is addressed using a nonlinear finite element method. To assist this method, a formula for the buckling strength of C‐SPW is theoretically developed. Utilizing the results of nonlinear finite element analysis on C‐SPW, the effects of concrete panel thickness, concrete elastic modulus, infill steel plate thickness, panel aspect ratio, and stud spacing on the infill steel plate buckling are analyzed, and the critical drift ratio corresponding to the buckling of the infill steel plate is obtained. According to the criterion that the C‐SPW will not buckle until its drift ratio achieves the drift limit (0.4%), the minimum concrete panel thicknesses demands are captured from finite element analysis. Fitting these predicted minimum concrete thicknesses, an available formula is proposed for the concrete thickness demand in the design of C‐SPW.     

Dynamic instability of laminated sandwich plates using an efficient finite element model

For the first time, the dynamic instability of laminated sandwich plates subjected to in-plane edge loading is studied using an efficient finite element plate model, which is developed recently by the authors. The plate model is based on a refined higher order shear deformation plate theory. In this theory, the transverse shear stresses are continuous at the layer interfaces with stress free conditions at plate top and bottom surfaces. It is interesting to note that the plate model having all these refined features requires unknowns at the reference plane only. However, this theory requires C¹ continuity of transverse displacement at the element edges, which is difficult to satisfy arbitrarily in any existing finite element. To deal with this, a new triangular element developed by the authors is used in the present paper.     

空腹夹层板在纵横载荷共同作用下的挠度

结合剪力键式空腹夹层板在工程中的广泛应用,介绍了空腹夹层板在纵横载荷共同作用下的挠度计算公式,最后就该挠度计算公式的应用进行了探讨,以完善空腹夹层板结构的设计,促进该结构的应用。     

Progressive failure analysis of notched composite plate by utilizing macro mechanics approach

In this study, gradual and sudden reduction methods were combined to simulate a progressive failure in notched composite plates using a macro mechanics approach. Using the presented method, a progressive failure is simulated based on a linear softening law prior to a catastrophic failure, and thereafter, sudden reduction methods are employed for modeling a progressive failure. This combination method significantly reduces the computational cost and is also capable of simultaneously predicting the first and last ply failures (LPFs) in composite plates. The proposed method is intended to predict the first ply failure (FPF), LPF, and dominant failure modes of carbon/epoxy and glass/epoxy notched composite plates. In addition, the effects of mechanical properties and different stacking sequences on the propagation of damage in notched composite plates were studied. The results of the presented method were compared with experimental data previously reported in the literature. By comparing the numerical and experimental data, it is revealed that the proposed method can accurately simulate the failure propagation in notched composite plates at a low computational cost.     

斜拉桥锚拉板结构分析

为确保桥梁结构安全可靠,对某斜拉桥锚拉板进行了空间有限元分析,并根据计算结果提出了建议,为随后锚拉板结构尺寸的确定奠定了基础,从而保证设计的桥梁经济合理和安全有效。     

Interaction between laser-welded web-core sandwich deck plate and girder under bending loads

Present paper investigates the interaction between laser-welded web-core sandwich deck plate and supporting girder under bending loads. The study is based on two linear-elastic Finite Element (FE) approaches, i.e. one using beam elements to model the girder and shell elements to model the homogenized web-core sandwich plate. With this approach the obtained FE model is considerably smaller than in the case of modeling the full, periodic, 3D geometry with shell elements. The FE solution results in stress resultants for beam and shell elements. These stress resultants do not describe accurately the periodic stress response of the sandwich plate or shear stress distribution at girder web. Therefore, the paper utilizes analytical methods to calculate these stress components from the obtained Finite Element solution. The second computational approach is based on modeling the actual 3D topology with shell elements. The two approaches are shown to be in very good agreement. The investigation shows that the effective flange width of the sandwich is different for the top and bottom face plates indicating that the interaction is different for these face plates. The present study also shows that this difference between the two faces depends strongly on the orientation of the web plates of the sandwich with respect to girder axis and the stiffness of the girder. The investigation also shows that the normal stress response in bending is dominated by the interaction between the sandwich plate and the girder, but also by the shear-induced normal stresses at the outer surface of the plate.     

空腹夹层板有限元分析的两种模型

根据空腹夹层板的构造特点 ,提出了空腹夹层板有限元分析的两种计算模型。其一为板壳元、块体元模型 ,其二为板壳元、剪切元及梁元模型。结合一实际工程算例 ,对这两种计算模型作了分析对比 ,得到了一些有价值的结论     

泡沫铝芯体夹层板的抗侵彻性能数值模拟计算

结合试验,采用ANSYS／LSDYNA非线性动力分析有限元程序对泡沫铝芯体夹层板抗侵彻性能进行了数值模拟计算,主要对子弹、泡沫铝及泡沫铝芯体夹层板的计算模型的选取进行了阐述,并且对计算结果和试验结果存在的误差进行了分析说明。     

山西漪汾桥加固设计方案比选

以山西漪汾桥为例,对正交异性钢桥面与结合梁方案进行了对比,阐述了两者的优缺点,比较发现钢-混凝土组合梁能充分发挥钢材与混凝土这两种材料的优势,且钢梁架设计完成后可作为混凝土结构施工的模板。     

行走激励下大跨度空腹夹层板结构振动舒适度分析

随着大跨结构的发展,舒适度已成为评价楼盖结构性能的重要指标。针对大跨度空腹夹层板楼盖,考虑行走路线和步行频率影响进行了振动响应计算。分析表明,空腹夹层板的自振特性类似于实心平板,低阶振型主要表现为竖向振动;采用行走路线法评价楼盖舒适度时,应根据实际情况采用较长的路线并使其通过低阶振型中心;定点激励法计算的峰值加速度要低于通过低阶振型中心行走路线的计算结果,据此评价楼盖舒适度是有局限性的;楼盖上不同感受点的加速度响应峰值是不同的,较大的加速度响应峰值只出现在低阶振型中心周围。     

装配式钢结构复合夹芯墙板施工新技术研究及墙板性能模拟分析

针对装配式建筑受原材料配合比、配套材料、成型工艺、安装工序、结构荷载等作用,工程应用中产生裂缝的现象日益增多,对装配式建筑内隔墙板施工新技术及受力变形特性进行分析,采用有限元软件ADINA,建立水泥基复合夹芯墙板抗弯及抗剪计算模型,考虑几何非线性、材料非线性,提出计算基本假定,对水泥基复合夹芯墙板在横向均布荷载作用下抗弯及抗剪性能进行模拟,分析水泥基复合夹芯墙板的开裂荷载、极限荷载、复合墙板的荷载-挠度关系曲线及复合墙板的荷载-应变关系曲线,并将有限元分析结果与型式检验报告结果对比,验证计算模型的准确性,得出水泥基复合夹芯墙板是一种轻质高强、抗弯抗剪性能良好的内隔墙体。     

子模型法在大跨径斜拉桥桥面结构分析中的应用

在对大跨径混凝土桥梁整体结构有限元分析的基础上 ,应用子模型法对大跨径混凝土斜拉桥梁桥面板局部进行了有限元结构受力分析 ,分析轴向不同位置桥面板结构的变形特点及应变状态 ,并与所建立的普通路面模型基层弯沉进行对比分析 ,从桥面板弯沉及应变角度分析大跨径混凝土箱梁桥面铺装对沥青混凝土的性能要求 ,并总结了大跨径桥梁桥面铺装的力学分析方法 ,为大跨径混凝土桥梁沥青桥面铺装的设计提供参考依据。     

斜拉桥钢箱梁横隔板受力分析研究

针对横隔板在轮载作用下的受力特性进行了研究,选取一个节间的钢箱梁节段建立空间模型进行有限元分析,结果表明在设计荷载作用下,横隔板除开孔处会出现应力集中外,其他应力水平均满足规范要求,在钢箱梁设计中应合理开孔并控制开孔尺寸。     

一种新型FRP桥面板型材承载力研究

针对一种新型的拉挤成型FRP（纤维增强复合材料）桥面板型材进行了静载极限承载力试验分析,并通过有限元软件（ANSYS）进行了有限元仿真模拟,试验与有限元分析对比验证得出此FRP型材的破坏模式,并为FRP桥面板型材的实际工程设计与工程应用提供依据。     

不同边界空腹夹层板在纵横载荷作用下的挠度

针对建筑工程中作为楼盖的剪力键式空腹夹层板具有不同边界条件的现状,以对边固定、对边简支为例,说明不同边界条件的剪力键式空腹夹层板在纵横荷载共同作用下的挠度计算方法,指出其他各种边界条件的挠度计算公式可按该文思路导出。     

桥梁板损伤的有限元分析

本文分析了桥梁板损伤的特点,提出了桥梁损伤中有限元分析的目的与原则,论述了桥梁板损伤有限元分析的重要性和存在的相关问题,并提出了相应对策。以期桥梁建筑设计得到进一步完善,提高人们在生活工作中的安全性。