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预应力钢结构有哪几种类型?

发布时间:2015-9-9 9:18:16 浏览次数:568
1.是张力金属膜型。金属膜片固定于边缘构件之上,既可作为围护结构,又作为承重结构参与整体承受荷载。或在张力态下,将膜片固定于骨架结构之上,形成空间块体结构,复盖跨度,两者都是在结构成型理论指导下诞生的预应力新型体系。此类型已应用于1980年莫斯科奥运会的几个主赛场馆中,国内尚未建成此类结构体系。

2.是传统结构型。在传统的钢结构体系上,布置索系施加预应力以改善应力状态、降低自重及成本。譬如,预应力桁架、网架、网壳等。像天津宁河体育馆、攀枝花市体育馆及北京奥运羽毛球馆的预应力网架、网壳屋盖。目前,国内外的候机楼、会展中心均广泛地采用张弦立体桁架也归入此类。另一种是工程中应用已久的悬索结构,譬如,北京工人体育馆、浙江人民体育馆等。其结构由承重索与稳定索两组索系组成,施加预应力的目的不是降低与调整内力,而是赋予与保证结构刚度。

3.是吊挂结构型。结构由竖向支承体系(立柱、门架、拱架等)、吊索及屋盖三部分组成。支承体系高出屋面,于其顶部下垂钢索吊挂屋盖。对吊索施加预应力以调整屋盖内力,减小挠度并形成屋盖结构的弹性支点。由于支承体系及吊索暴露于大气之中,直指蓝天所以又称暴露结构。譬如,江西体育馆、北京朝阳体育馆、杭州黄龙体育场及长春体育场等。

4.是整体张拉型。属创新结构体系,跨度结构中摒弃了传统受弯构件,全部由受张索系及膜面和受压撑杆组成,其屋面结构极轻,设计构思新颖,是先进结构体系中的佼佼者,譬如,汉城及亚特兰大奥运主赛馆、慕尼黑奥运体育馆建筑群以及内蒙古自治区鄂尔多斯伊旗索穹顶体育中心。




1. Is the tension type metal film. Metal diaphragm fixed on the edge components, can be used as retaining structures, and bear loads as bearing structure in whole. Or under tension state, will be fixed on the frame structure of diaphragm, form the space block structure, covering span, both are in structure formed under the guidance of the theory of the birth of the new system. This type has been applied to the 1980 games in Moscow a few main pavilion, domestic have not been built this kind of structure system.

2. Is a traditional structured. Decorate in the traditional steel structure system, applying prestressed cable system to improve the stress state, reduce weight and cost. For example, the prestressed truss, rack, net shell, etc. Like NingHe gymnasium, mr.zhang stadium in tianjin and Beijing Olympic badminton hall of prestressed space truss and reticulated shell roof. At present, a squat, convention and exhibition center are widely adopted a three-dimensional truss are classified as such. Another is in the engineering application has long cable structure, for example, the Beijing workers' stadium, zhejiang people's stadium, etc. Its structure by bearing cable and stable cable cable system composed of two groups, prestressing is not the purpose of reducing and adjust the internal forces, but gives and ensure the structure stiffness.

3. The structure that is hanging. Vertical bearing structure by the system (columns, door frame, arch, etc.), sling and roof of three parts. Above the roof support system, in the top sagging wire hanging roof. Sling prestress to adjust the internal forces of the roof, reduce the deflection and the formation of roof structure of elastic fulcrum. Due to the supporting system and the sling exposed to atmosphere, pointing to the blue sky so say again exposed structure. Jiangxi stadium, Beijing chaoyang stadium, for example, hangzhou huanglong stadium and changchun stadium, etc.

4. The tension is whole model. Innovation structure system, the span structure, abandoned the traditional flexural members all by a cable system and the membrane surface and compression strut, its light roof structure, the design is novel, are of advanced structure, for example, and the Atlanta Olympic Games in Seoul main pavilion, the Munich Olympic stadium buildings, as well as Inner Mongolia erdos Iraqi flag cable dome is sports center.




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