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近年来双向钢-混凝土组合楼盖的应用日益广泛,但对其试验研究和理论分析较少,工程应用中对单、双向钢-混凝土组合楼盖力学特性的差异研究不多,对两种楼盖形式的经济性和适用范围比较模糊。采用非线性有限单元法计算分析了单、双向钢-混凝土组合楼盖静、动力特性,分析结果表明:双向组合楼盖通常具有更高的刚度和承载力,但随着长宽比增大,空间作用降低,单位面积用钢量增加;综合考虑组合楼盖力学特性、经济性以及施工等因素,建议长宽比小于1.3时采用双向布置。 相似文献
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Wen Lingyan 《建筑结构》2008,(8)
用梁格法、拟板法、有限元法对四边简支双向钢-混凝土组合楼盖弹性阶段的变形及内力进行分析。通过与试验结果的对比可以看出,拟板法和有限元法计算简支双向组合楼盖比梁格法更经济且计算结果更全面。改变梁格数及板厚跨比进行算例分析可知,拟板法可用于分析常见结构布置的简支双向钢-混凝土组合楼盖。 相似文献
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当前越来越多的公共建筑采用大柱网、大空间的钢结构楼盖,根据常见18 m、21 m、24 m、27 m、30 m、33 m、36 m、39 m的大跨度结构,分别对型钢–混凝土组合梁楼盖、型钢梁混凝土楼盖、钢桁架–混凝土组合楼盖、矩形钢–混凝土组合楼盖四种不同的结构楼盖方案,应用结构分析软件建立数值模型,进行经济性分析,结果表明考虑材料价格及施工的便易性,建议18~30 m跨度优先采用型钢–混凝土组合梁楼盖;30~33 m跨度可选用型钢-混凝土组合梁楼盖或钢桁架–混凝土组合楼盖;33 m以上跨度建议优先采用钢桁架–混凝土组合楼盖。 相似文献
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结合具体工程,介绍了在钢-混凝土组合结构住宅的施工中,楼盖施工采取的逆作顺序,以及钢管混凝土柱、钢骨混凝土主梁和密肋楼盏施工时所采取的一些先进的施工方法。 相似文献
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A.V.A. Mello P.C.G. da S. Vellasco L.R.O. de Lima 《Journal of Constructional Steel Research》2008,64(10):1142-1151
Structural engineers have long been trying to develop solutions using the full potential of its composing materials. At this point there is no doubt that the structural solution progress is directly related to an increase in materials science knowledge. These efforts in conjunction with up-to-date modern construction techniques have led to an extensive use of composite floors in large span structures. On the other hand, the competitive trends of the world market have long been forcing structural engineers to develop minimum weight and labour cost solutions. A direct consequence of this new design trend is a considerable increase in problems related to unwanted floor vibrations. For this reason, the structural floors systems become vulnerable to excessive vibrations produced by impacts such as human rhythmic activities. The main objective of this paper is to present an analysis methodology for the evaluation of the composite floors human comfort. This procedure takes into account a more realistic loading model developed to incorporate the dynamic effects induced by human walking. The investigated structural models were based on various composite floors, with main spans varying from 5 to 10 m. Based on an extensive parametric study the composite floors dynamic response, in terms of peak accelerations, was obtained and compared to the limiting values proposed by several authors and design standards. This strategy was adopted to provide a more realistic evaluation for this type of structure when subjected to vibration due to human walking. 相似文献
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杭州湖滨国际名品街塔楼工程改造范围非常广,结构设计难度非常大。主要的改造内容有:1)东塔的底部拆除两层楼板,新加一层楼板;2)西塔的底部拆除三层楼板,新加两层楼板;3)两塔通过新增的三层裙房和标准层连廊连为一体,形成了带错层的连体结构,结构的体型发生了重大变化。从整体结构出发,讨论结构体系的选择。通过调整结构布置来优化各项抗震指标,进而深化局部构件的加固和关键构件的节点设计,并分析了这些构件的优缺点。 相似文献
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新天翔广场为一栋地下2层、地上24层的高层商住楼,由于存在部分搭接柱转换,塔楼采用主次楼层的结构形式,对部分楼层而言还存在楼板不连续的情况,且部分楼层采用无梁楼盖体系,属超限高层建筑。介绍了工程的特点和结构设计情况,设计时采取了基于性能的抗震设计和比现行规范要求更为严格的抗震措施。经对结构进行多模型的弹性分析和时程分析可知,其工作状态和性能均能达到预期性能目标和规范要求。 相似文献
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以连云港市东方海逸豪园工程项目C#、D#楼工程实例,详细介绍型钢混凝土组合结构转换层的图纸深化设计、型钢混凝土梁、柱及模板支撑系统施工方案及大体积混凝土采用一次性连续浇筑工艺等一系列施工措施。该工程实践结果证明,结构深化设计合理,组织管理严密,型钢混凝土组合结构转换层施工方法得当,降低了施工成本,保证了工程质量和结构安全。 相似文献
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冷轧带肋钢筋混凝土叠合板试验研究 总被引:6,自引:0,他引:6
对四块大尺寸冷轧带肋钢筋叠合板进行加载试验,在研究其承载力、挠度、变形性能的基础上,将叠合板楼盖应用于几个实际工程,结果表明该种叠合板楼盖不仅在结构、抗震性能上有其优点,而且施工速度快,节省模板,造价低廉,是一种值得推广的新技术、新工艺. 相似文献
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Composite steel-concrete flexural members have become increasingly popular in the design and construction of floor systems, structural frames, and bridges. A subtype of such composite floors is a system featuring composite trusses, also referred to as composite open-web joists, which can span large lengths and provide open web space for the installation of typical utility conduits. One problem that arises with respect to composite joists has been the installation of welded shear studs. In many composite trusses, the composite action can significantly reduce the required size and thickness of the top chord. The thinner the top chord member becomes, the more difficult it is to weld studs without burning through the base member. Likewise, as the joists get smaller, the greater the sweep (lateral out-of-straightness) tends to become. For these reasons, a form of shear connector other than welded shear studs is of interest. The results of the elemental push-out tests, analytical study and the resulting strength prediction models for the strength of the shear connection have previously been presented by the authors. This paper presents the analytical and experimental findings pertaining to the design and behavior of composite truss members with standoff screws as shear connectors. 相似文献