替换空心板的变高度后张预应力T梁设计研究  

Design of Post-tensioned T-beams with Variable Depth for Substituting Voided Slabs

作　　者：邢渊 李志峰 刘钊[2] 马增[2] 马松根 刘志勇 

机构地区：[1]华汇工程设计集团股份有限公司,绍兴312000 [2]东南大学土木工程学院,南京210096 [3]绍兴袍江建设投资有限公司,绍兴312000

出　　处：《结构工程师》2015年第4期60-64,共5页Structural Engineers

摘　　要：结合某空心板梁桥的单板受力病害,提出采用一种变高度后张预应力T梁替换空心板的处置设计方案。该结构方案的梁端与原空心板梁高度相等,跨中梁高适当增加,这样可以在不改变原桥面标高的前提下更新桥跨结构。为此,在截面构造上加密了T梁的肋间距(比一般横向装配式T梁的肋间距小),优化了预应力筋布置,并在T梁端部设计了"预埋钢板"和"抗剪钢筋骨架"两种抗剪加强构造,可为同类工程的改造设计提供参考。Regarding to the slab separately loading scenario in a voided slab deck,an alternative disposal method is presented to replace the original voided slab deck by post-tensioned T-beam with variable depth.In this design,the beam keeps the same depth at end part with the original voided slab and has an increased depth in the middle part.As a result,the new superstructure can be replaced without altering the existing bridge deck elevation.To achieve this,the rib spacing is reduced （smaller than that of prefabricated and transversely assembled T-beam）,and the cross section and the distribution of prestressed tendons is optimized as well.In addition,both “pre-embedded steel plates”and “shear reinforcement skeleton”are elaborately designed to enhance the end of the T-beam.The practice can be very informative for the similar retrofit projects.

关 键 词：空心板梁 T梁 变高度梁 桥梁改造 抗剪设计 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]