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《建筑结构学报》2013,(Z1)
钢-混凝土组合结构是土木工程中一种主要的组合结构形式。在桥梁工程中,从基本受力性能出发,可分为组合梁、组合柱和组合拱。介绍了钢-混凝土组合桥梁的主要结构形式及其在我国应用的基本情况,着重介绍了近些年新出现的组合桥梁结构形式的研究进展与工程应用。传统的组合桥梁,如钢梁-混凝土板组合梁、波形钢腹板-PC组合梁、钢管混凝土拱桥等,在我国已有较多应用,规范体系也正在形成,今后应不断总结实践经验,完善规范,同时密切跟踪国际最新发展趋势,开展创新性的研究。新型组合结构桥梁的研发在我国异常活跃,如近年来提出了劲性骨架混凝土桥面板-钢管混凝土桁架组合桁梁、波形钢腹板-钢管混凝土组合梁、钢管混凝土劲性骨架柱、钢管混凝土主肢-混凝土缀板复合柱和混合柱、钢腹板(杆)-混凝土组合拱等新型桥梁组合结构,有些已在实际工程中得到少量应用,有些仍未在实际工程中应用。今后,应加强应用推广,并结合实际工程需要开展应用技术研究,形成应用指南或技术标准,进一步推动我国组合结构学科的发展和桥梁工程的技术进步。 相似文献
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《Planning》2014,(3)
钢管混凝土拱桥属于钢—混凝土组合结构的一种,它根据钢管与混凝土的组合关系分为内填型钢—混凝土拱桥组合形式与内填外包型钢—混凝土拱桥组合形式。本文主要介绍以上两种钢—混凝土拱桥破坏的几种主要形式及这几种破坏形式的主要原应,以及这几种破坏的形式的主要预防与加固方法。 相似文献
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《钢结构》2010,(6)
在连续钢-混凝土组合梁的设计中,在下垂段可利用横截面的塑性抵抗,该区段内钢梁的受压法兰与钢筋混凝土板相连。然而,在弯曲段正常采用横截面的弹性验证,该区段内钢梁的受压部分不受混凝土板的约束,更易于屈曲。在下垂段采用利用塑性抵抗而在弯曲段采用弹性抵抗的综合设计方法,能满足弯曲段弯矩低于弹性极限时,下垂段的塑性弯矩仍能上升的要求。研究的目标是:提出钢-混组合桥梁简化的概率非线性分析的框架及通过此框架获得实际的三跨连续钢-混组合公路桥梁的弹塑性设计。基于一次二阶矩近似,采用所提方法计算结构响应量的一阶和二阶统计矩(方差、协方差)。说明和讨论了基准问题的确定及概率数值结果。 相似文献
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《钢结构》2016,(11)
泸溪武水大桥为大跨度钢箱-混凝土组合系杆拱桥,主拱采用钢箱-混凝土组合拱,主梁采用钢管混凝土桁腹与混凝土桥面组合梁。钢箱拱肋的拱脚节段部分采用钢箱内灌注混凝土组合结构、拱肋其他节段部分采用内空钢箱结构。桥梁设计根据组合琴拱桥理论,合理调整拱轴线,改变拱肋截面大小,拱圈灌注混凝土,可减小拱脚水平推力、节省水平系杆;充分发挥组合材料的力学性能,增加拱肋刚度,增强主拱横向稳定性;提高截面的结构效率,有效减轻桥梁自重,提高桥梁结构耐久性。该桥方案设计实现了大跨度异型拱桥力学与美学的统一。针对大跨度拱桥水平推力、横向稳定、施工安装3大关键技术难题,提出新的解决思路和技术方法。对于主桥结构采用MIDAS/Civil空间有限元分析程序进行分析,结果表明:结构整体刚度好、结构稳定性好。 相似文献
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本文介绍了在工程上经常用到的有混凝土结构、钢结构、钢-混凝土组合结构这三种类型,并详细地探讨了钢-混凝土组合结构的发展及工程应用,分析了钢-混凝土组合结构需要进一步研究的问题。工程实践表明,该类结构具有显著的经济与社会效益,值得推广。 相似文献
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钢—混凝土组合桥混凝土徐变收缩分析 总被引:11,自引:0,他引:11
本文介绍钢混凝土组合桥梁混凝土徐变、收缩分析的方法,研究内容涉及结合梁桥及钢管混凝土组合拱桥。文末给出了可供参考的结论 相似文献
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Jiangang WEI Qingwei HUANG Baochun CHEN 《Frontiers of Structural and Civil Engineering》2010,4(3):370
The concrete arch bridge is a natural and appropriate structural solution, aesthetically pleasing and easily integrated into the environment, especially in mountainous and island areas. However, construction difficulty and cost will increase with heavy self-weight when the span enlarges. A potential solution is to use a composite box arch ring with steel web-concrete flange. Taking Wanzhou Yangtze River Bridge (the longest concrete arch bridge in the world with a main span of 420 m) as a prototype, trial designs of a composite box arch with steel webs (including corrugated steel webs and plain steel webs) and concrete flanges were carried out. Comparison of quantities and structural behaviors of the prototype concrete arch with the two trial designed composite arch was presented. It is shown that the self-weight of the composite arch can reduce about 28% and the structures can meet the design requirements, therefore it is possible to use the two composite arches in long span arch bridges. 相似文献
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Jiangang Wei Qingwei Huang Baochun Chen 《Frontiers of Architecture and Civil Engineering in China》2010,4(3):370-375
The concrete arch bridge is a natural and appropriate structural solution, aesthetically pleasing and easily integrated into
the environment, especially in mountainous and island areas. However, construction difficulty and cost will increase with
heavy self-weight when the span enlarges. A potential solution is to use a composite box arch ring with steel web-concrete
flange. Taking Wanzhou Yangtze River Bridge (the longest concrete arch bridge in the world with a main span of 420 m) as a
prototype, trial designs of a composite box arch with steel webs (including corrugated steel webs and plain steel webs) and
concrete flanges were carried out. Comparison of quantities and structural behaviors of the prototype concrete arch with the
two trial designed composite arch was presented. It is shown that the self-weight of the composite arch can reduce about 28%
and the structures can meet the design requirements, therefore it is possible to use the two composite arches in long span
arch bridges. 相似文献
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针对双曲拱桥的提载加固,基于贵州省安顺市木浪河大桥的检测结果,提出了在主拱圈的拱脚上缘增大截面、下缘增大截面改造为箱形断面,以提高拱脚抵抗负弯矩、正弯矩的承载能力;对其它截面采用拱背增大截面以提高抵抗负弯矩的承载能力,相应也提高了抵抗正弯矩的承载能力;对正弯矩承载能力不足的截面,采用粘贴钢板的加固方法。结果表明:采用这种提载加固的设计方法,达到了提高荷载等级的目的,同时方便施工,便于达到加固效果。 相似文献
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钢桁腹预应力混凝土箱梁桥是采用桁式钢腹杆代替混凝土箱梁中混凝土腹板而形成的一种新型组合结构桥梁。介绍了这种桥型的发展、应用、结构特点及节点构造,并举例介绍了国内第1座钢桁腹预应力混凝土连续箱梁桥的设计情况,供工程设计人员参考。 相似文献
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三管式空间桁架钢管混凝土拱桥,截面构造简洁,可较好兼顾拱肋的横向、竖向刚度需求,具有截面形状稳定、吊杆(立柱)传力直接、施工便捷的优点。结合贵阳市花溪大桥的设计,提出了三管式截面的设计方法,分析了大桥的静力性能和极限承载力,表明大桥具有较好的刚度和安全储备;研究了拱肋管内混凝土采用泵送自密实混凝土的应用工艺,综合检测表明应用效果良好。 相似文献
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A new type of cable supported bridge, cable-stayed CFT arch bridge, was proposed and its static strength was studied in this paper. Arch ribs consist of concrete filled steel tubes (CFT). CFTs have high resistance against bending moments and compressive axial forces and are ideal as arch ribs. A cable-stayed CFT arch bridge with a main-span of 300 m was designed and the safety of its structural members was checked by the limit state design method. Large deformation analysis was used to obtain sectional forces. The CFT arch ribs and the steel box girders and towers of the designed bridge satisfied the required safety criteria for ultimate design loads. The applied loads were further increased until the bridge collapsed when the arch ribs buckled. The amount of steel required for the cable-stayed CFT arch bridge was significantly lower than that for the cable-stayed bridge. It has been found that the proposed cable-stayed CFT arch bridge is feasible and potentially economical. 相似文献
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Heinz Schmackpfeffer 《Stahlbau》2004,73(9):727-732
Steel‐Composite bridges with box girders which are to be inspected on foot. In the last years the development in shaping of cross sections of bridges over a valley shows a tendency to some special types in dependency on the site, which were built again and again. These are the cross sections with one trapezoid box girder, consisting of a steel trough and a concrete slab, which is to be inspecting on foot as well as cross sections with two airtight welded box girders of steel, connected with the concrete deck slab, too. All the bridges with these cross sections are so designed that there is only a composite effect in longitudinal direction. To realise an economical bridge building, there has to be taken some typical design criterions into consideration for each type of cross section. The following paper describes these design criterions for cross sections with one trapezoid box girder and points out the optimal cross section and the economical area of application. 相似文献