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下承式钢箱拱桥具有跨越能力较大、外形美观、构造较简单、施工技术成熟等优点,下承式钢箱拱桥在施工过程中索力的大小直接影响到桥梁的成桥线形及结构的应力分布。今以杭州市某下承式钢箱拱桥为例,阐述在成桥线形纵坡大于理论值时,如何在保证索力、应力满足结构安全的条件下通过调整索力来控制桥面线形,以便桥面线形达到较为理想的状态。 相似文献
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桥梁施工的控制是桥梁施工技术中重要的环节之一。本文以某钢箱系杆拱桥工程项目为例,利用Midas/Civil有限元分析软件,对下承式钢箱系杆拱桥进行建模分析。对施工过程中的结构内力和位移等进行监控,对比理论数据与实际监控数据,控制拱桥的施工过程在允许的误差范围内。研究表明,模拟计算数据与实际监控数据在允许的误差范围内,为现场的施工提供了一定的理论依据。 相似文献
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莆田城港大道跨木兰溪大桥主桥是两跨简支的双肋下承式钢箱拱肋结合梁桥面系的异型系杆拱桥,2跨跨径均为72 m.介绍大跨径异型系杆钢拱桥吊装施工技术,对钢结构拱桥安装的主要受力杆件进行计算,可供同类吊装施工参考和借鉴. 相似文献
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探讨了转体施工拱桥合龙误差的成因,深入研究了转动轴的定位误差分析,推导出转动轴定位偏差产生跨中合龙偏差的计算公式。通过结构力学方法和平面有限元模型相结合分析了合龙误差对钢箱拱肋的力学性能影响。 相似文献
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混凝土拱圈的浇注及其收缩变形控制问题是复合型上承式拱桥的施工控制的关键。文章以某复合型上承式拱桥工程为背景,通过施工过程中优化混凝土配合比设计、合理划分拱圈施工段、确定合拢顺序以及施工过程中对线形及混凝土浇注等加强控制,确保了复合型上承式拱桥的施工安全和工程质量。 相似文献
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本文结合某高速公路大桥工程实例,分析了五跨五拱刚性梁刚性拱斜跨拱桥结构钢箱拱安装施工技术。在施工中采取了一系列技术措施,有效确保了施工的质量、安全和进度。钢箱拱在安装过程中,支架结构安全、钢箱拱变形和应力满足设计监控要求:钢箱拱合龙顺利,成拱线形良好,均能满足设计要求。 相似文献
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Andrea Kahn 《Journal of Architectural Education》2013,67(2):62-64
Sitelessness and loss of place suggest the instability of boundaries that otherwise sustain the legibility of public institutions. Such conditions negate conventional affinities between architecture, ceremonial urban space, monuments, and monumental sculpture. Nowadays, the theoretical basis for a relationship between these actors is in flux. This article takes up several different contemporary conceptions of public space and the public thing and employs them in an interpretation of two recent projects: Maya Lin's Vietnam Veterans Memorial and Richard Serra's ill-fated Tilted Arc. These projects embody changing conditions in the dialogue between art, architecture, and the city. 相似文献
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Jeffrey Cook 《Journal of Architectural Education》2013,67(1):62-64
Abstract JAE's White Issue is long overdue. The notion that architectural experimentation requires a rigorous feedback between design and research has been at play in design pedagogy since at least the 1960s and 1970s, which included the seminal research studio by Robert Venturi, Denise Scott Brown, and Steven Izenour, Learning from Las Vegas 1; the rise of operations research and systems engineering; the urban networks research of Shadrach Woods, the Smithsons, Constantinos Doxiadis, or Kenzo Tange; and the structure and materials research of Buckminster Fuller, Frei Otto, and Robert Le Ricolais, to name but a few. Concerns about the deterministic instrumentalism of systems thinking led to a new wave of humanism and composition, seen especially in the postmodernist uses of both historical examples and junkspace vernaculars as a Disneyesque brand image. The work of Venturi and Scott Brown, ironically, was to lead the way on the heels of the “duck vs. decorated shed” conclusions of Learning from Las Vegas.2 Unlike most postmodernists, however, Venturi and Scott Brown did not abandon research, and their understanding of the relationships between pop culture, branding, and marketing techniques remains sophisticated and timely. 相似文献
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介绍京杭运河大桥边跨拱肋支架的设计与施工,对上承式中小型中跨度拱桥施工方案的设计、不规则大型混凝土构件现浇支架的设计、现浇支架基础的处理、混凝土结构物三维线形的施工控制等方面进行探讨。 相似文献
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对系杆拱桥进行有限元建模,分析拱的平面内屈曲长度系数,并将其与EC3中推荐的数值进行比较。首先简要介绍了EC3中针对拱的平面内屈曲性能提出的分析方法。随后说明了系杆拱桥的模型、桥梁特性和计算方法,并进行了参数分析。同时也对拉索损坏的情况进行了讨论。最后归纳了研究结论。 相似文献
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结合麓湖桥中式拱桥施工实例,介绍了钢筋混凝土无铰板拱拱圈施工技术,并详细阐述了支撑拱圈的满堂碗扣支架的搭设方案设计与计算.该工程仅4个月就完成施工,施工安全、工程质量优良,可供同类工程参考. 相似文献