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结合工程设计实践,主要对门式刚架轻钢建筑结构设计中应注意的一些问题如门式刚架轻钢建筑的适用范围、门式刚架基本参数的初选、支撑和刚性系杆的布置、檩条和墙梁的布置及梁柱节点和柱脚锚栓设计等进行了探讨。 相似文献
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以平面正则刚架为例,介绍了杆系预应力砼结构的矩阵位移法,系统分析了预应力混凝土构件是混凝土材料高抗压性能和钢材高抗拉性能的理想组合,其结构广泛应用于各种具有大空间需要的建筑之中,并提出了随结构超静定位数的增加,大量的计算需用计算机,矩阵位移法是解决计算机编程的方便快速的方法。 相似文献
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从钢管混凝土系杆拱桥的设计出发,对主拱肋拱轴线形状、主拱肋矢跨比、主拱肋横断面形式的选择进行探讨,同时指出系杆拱桥宜采用柔性系杆刚性拱结构,系杆宜采用预应力钢管混凝土结构,吊杆应采用预应力,但其最后支持系杆拱桥的稳定问题是不容忽视的. 相似文献
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《The IES Journal Part A: Civil & Structural Engineering》2013,6(2):63-72
A new method is proposed for deriving the instability potential of initially stressed curved beams based on the rigid body and equilibrium considerations using the updated Lagrangian formulation. Starting from the rigid body rule, the virtual instability potential was derived for a spatially curved beam under real rigid displacements. Next, utilising the equilibrium equations for the boundary forces at the C1 and C2 states, another virtual instability potential was derived for the curved beam under virtual rigid displacements. Comparing the two potentials yields the one in total form for the curved beam. The present approach requires only simple integrations and analogical comparison of related virtual works, thereby avoiding the physically unclear, complicated derivations involved in previous procedures. Based on the first principles of rigid body rule and equilibrium, the derived potential energy is more concise than the conventional approach that requires the consideration of six stress components in the formulation. As an illustration, the present theory was successfully adopted in the buckling analysis of helical curved beams under radial loads. 相似文献
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广州珠江帝景会所游泳池圆形屋顶直径达34m,经过多方案比较,最后采用预应力混凝土梁体系。预应力主梁星形布置,每根内环柱支承斜向交叉的两根主梁,次梁环向布置。计算采用空间杆系模型,梁柱节点为刚接。结算结果表明,屋盖预应力大梁的挠度、裂缝宽度和控制截面的承载力均满足规范的要求。预应力筋的布置高度上下错开,避免了预应力相交的问题。工程的经验可以供类似工程参数。 相似文献
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环梁连接的RC梁-钢管混凝土柱框架试验研究 总被引:17,自引:0,他引:17
介绍了一个采用钢筋混凝土 (RC)环梁连接的 2层 2跨RC梁 -钢管混凝土 (STCC)柱框架的拟动力试验和静力试验。为了研究环梁在地震作用下的破坏形态 ,大部分节点设计成“弱环梁、强框架梁” ,即环梁屈服先于框架梁 ;少量节点设计成“强环梁、弱框架梁” ,即框架梁屈服先于环梁。试验表明 :小震时 ,框架的刚度降低很少 ;中震时 ,刚度降低约 3 0 % ;大震时 ,层间位移角小于 1 10 0 ;即使弱环梁已经破坏、层间位移角达 1 3 4,框架的承载力仍未下降 ;能够实现“强柱弱梁”和实现塑性铰形成于框架梁端的“强连接、弱构件”的抗震设计概念。RC环梁与STCC柱之间局部范围的缝隙不影响框架的整体抗震性能 ;环梁与柱之间几乎无相对竖向滑移。采用RC环梁连接的RC梁 -STCC柱框架具有良好的抗震性能。 相似文献
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There are situations in which a composite steel–concrete beam is subjected to torsion, such as members that are curved in plan or straight edge beams. The concrete slab and steel beam contribute to the torsional strength and stiffness of a composite steel–concrete beam, but this composite action is usually ignored in design codes of practice, which leads to conservative designs. Therefore, this paper investigates the ultimate strength of curved in place composite steel–concrete beams. Eight curved in plan composite steel–concrete beams have been tested under a single applied load at mid-span. Partial shear connection has also been considered in these tests. The composite steel–concrete beams have been designed with different span/radius of curvature ratios. This paper further supports the view that, in the presence of flexure, there will be an increase in the torsional moment capacity, but the flexural moment capacity does not greatly increase in the presence of torsion. A model has also been presented to represent the bending–torsion interaction for curved in plan composite steel–concrete beams with full and partial shear connection. 相似文献
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The purpose of this paper is to present the results of an experimental investigation of the behaviour of four types of thin-walled box beam and to compare the results with those obtained from theoretical analyses.Three steel models consisting of a straight single cell cantilever, a curved single cell cantilever and a simply supported twin box have been constructed, in addition to a continous prestressed concrete two-span double cell beam.Details are given of the methods of construction, instrumentation and experimental procedure for all the models.The behaviour of the individual models has been studied, with particular attention being given to the torsion and distortion of the box sections, the cross-sectional distributions of the longitudinal and transverse bending stresses and the deflections. Appropriate experimental results are presented, therefore, and are compared with those obtained from the specially developed thin-walled box beam finite element which has been presented previously in this journal. 相似文献
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介绍为满足金塘大桥预制梁场移运长60m、质量1600t的箱梁而专门研制的DLT900型轮胎式搬运机,两台搬运机可同步以直行、斜行或横行等多种模式工作,完成箱梁的起吊、台座间的转移以及装船的工作。设备是机一电一液一体化产品,拥有自主知识产权,采用了多项创新技术,主要包括GPS/RTK定位无线通讯控制系统等,为超大型整孔预制箱梁移运提供一种经济可行的新方案。设备已移运箱梁430片,出海装船400片,具有作业效率高,机动灵活,操作简便,人工劳动强度低等优点,在大型混凝土构件陆上移运施工中具有一定的参考价值。 相似文献
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为考察板件宽厚比对焊接箱形截面梁抗震性能的影响,对中国、美国、日本和欧洲的钢结构设计标准中的相关规定进行了比较,结果表明各国规范对于梁板件宽厚比限值的规定总体上具有较好的一致性。采用钢材循环加载本构,建立了多尺度非线性有限元计算模型。提出了刚性竖杆 箱形梁加载方式,模拟水平地震、重力荷载与轴向压力对箱形截面框架梁的作用。有限元分析结果表明,在设计常用的板件宽厚比范围内,箱形截面梁的弹性屈曲荷载均显著高于其屈服荷载。在水平往复荷载作用下,随着板件宽厚比减小,箱形截面梁极限变形角与延性系数随之增大,抗弯刚度降低速率变缓,塑性耗能能力显著增强。当满足一级抗震宽厚比要求时,焊接箱形截面梁的梁端截面转角约为1/30。承受轴压作用时梁刚度退化很快,变形能力减弱。当轴压比不大于0.2、满足一级抗震宽厚比要求时,梁端截面转角约为1/50。跨高比对梁承载力影响不大,但变形能力可以大幅度提高。横向荷载对梁抗震性能的影响显著,随着静载比(重力荷载代表值与屈服弯矩之比)增大,骨架曲线逐渐发生平移,抗弯刚度降低,耗能性能减弱。当地震弯矩与静力弯矩方向相同时,箱形截面梁承载力显著降低,静载比0.8时极限变形角可减小约50%;当地震弯矩与静力弯矩方向相反时,梁虽然承载力稍有提高,但极限变形角略有减小。 相似文献