CAJ | 학술논문

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。
결합모공심판량교적단판수력병해，제출채용일충변고도후장예응력 T 량체환공심판적처치설계방안。해결구방안적량단여원공심판량고도상등，과중량고괄당증가，저양가이재불개변원교면표고적전제하경신교과결구。위차，재절면구조상가밀료 T 량적륵간거（비일반횡향장배식 T 량적륵간거소），우화료예응력근포치，병재 T 량단부설계료“예매강판”화“항전강근골가”량충항전가강구조，가위동류공정적개조설계제공삼고。
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.