An analytical study of precast, prestressed concrete girder spans using 0.7 in. strand

IF 0.9 4区 工程技术 Q4 CONSTRUCTION & BUILDING TECHNOLOGY PCI Journal Pub Date : 2023-06-01 DOI:10.15554/pcij68.4-02
K. Harries, B. Shahrooz, P. Ball, Tianqiao Liu, Venkata S.S.P. Sathiraju, A. Alabdulkarim, Richard A. Miller, R. Castrodale
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Abstract

It has been proposed that 0.7 in. (17.8 mm) diameter prestressing strand be permitted for use in bridge girders. If 0.6 in. (15.2 mm) diameter strand is replaced on a one-to-one basis with 0.7 in. strand, the pretensioning force can be increased by 35%. When designs use 0.7 in. strands as well as high concrete strengths, longer-span prestressed concrete girders may be achieved. An extensive analytical study is presented to assess the maximum girder span lengths that can be achieved when using 0.6 and 0.7 in. strands. A parametric design study with 584 cases was conducted to examine the influence of girder shape and size on the potential benefits of using 0.7 in. strands. A detailed finite element analysis of some of the longer spans achieved was also conducted. The impacts of using 0.7 in. strands on end-region detailing requirements, prestress transfer, and handling and erection stability of long-span girders were examined. Girder span increases of up to 22% were achieved using 0.7 in. strand in place of 0.6 in. strand. The larger pretension forces affected end-region detailing and increased congestion, though all resulting requirements were constructible. The longer spans affected girder stability calculations, and some girder types required a wider top flange to meet stability-related limit states.
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预制预应力混凝土梁跨度的分析研究。链
建议允许在桥梁主梁中使用直径为0.7英寸(17.8 mm)的预应力钢绞线。如果将直径为0.6英寸(15.2 mm)的钢绞线一对一地替换为0.7英寸的钢绞线,则预张力可增加35%。当设计使用0.7英寸绞线和高混凝土强度时,可以实现更长跨度的预应力混凝土梁。进行了一项广泛的分析研究,以评估使用0.6和0.7英寸绞线时可以实现的最大主梁跨度长度。对584个案例进行了参数设计研究,以检查主梁形状和尺寸对使用0.7英寸绞线的潜在效益的影响。还对所获得的一些较长跨度进行了详细的有限元分析。研究了使用0.7英寸绞线对大跨度梁端部区域细部要求、预应力传递以及搬运和架设稳定性的影响。使用0.7英寸绞线代替0.6英寸绞线,梁跨度增加了22%。较大的预张力影响了端部区域的细节设计,并增加了堵塞,尽管所有由此产生的要求都是可施工的。跨度较长会影响主梁的稳定性计算,一些主梁类型需要更宽的顶部翼缘来满足稳定性相关的极限状态。
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来源期刊
PCI Journal
PCI Journal 工程技术-结构与建筑技术
自引率
9.10%
发文量
15
审稿时长
>12 weeks
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