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本文以算例的形式介绍和讨论了美国当前中、小型预应力混凝土公路梁桥的计算方法及构造细节。定型的标准梁是由全美公路及运输工作者协会(AASHTO)和美国预应力混凝土学会(PCI)制定,并按设计规范计算的。主梁为预制预应力混凝土构件,以先张钢绞线为力筋:工地现浇桥面板,并在中间支座处的顶板及梁底设置负、正弯矩的钢筋,以构成连续梁的普通配筋。本文以三跨连续梁为例,对AASHTO规范条款的应用作了适当的解释,对正负挠曲强度和剪切强度,传力锚固时梁端的局部配筋,应力损失以及长期挠度(或上拱)等也作了详尽的计算。
This paper introduces and discusses the calculation method and structural details of the current medium and small prestressed concrete highway bridges in the form of examples. Stylized standard beams were developed by the National Association of Road and Transport Workers (AASHTO) and the American Society of Prestressed Concrete (PCI) and were calculated according to design specifications. The main beam is a precast prestressed concrete member. The prestressed steel strand is used as the tendon: the site is cast with a bridge deck, and a negative and positive moment steel bar is arranged on the roof and the beam bottom at the middle support to form a continuous beam Ordinary reinforcement. Taking the three-span continuous beam as an example, the application of the AASHTO code is explained appropriately. The influences of the positive and negative flexural strength and shear strength, the local reinforcement of the beam end, the stress loss and the long-term deflection Arch) also made a detailed calculation.