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一、前言 部分预应力是1970年国际预应力协会——欧洲混凝土委员会(FIP—CEB)提出的一种新概念。部分预应力是结构在运营荷载下容许出现较大拉应力,但裂缝宽度必须控制。因此建造部分预应力混凝土桥一定会收到可喜的经济效果。 目前林区普遍采用的梁式桥,基本上是普通钢筋混凝土简支梁桥,而全予应力桥和有限予应力桥在林区有为数甚少。在这种状况下,要想加快林区桥梁建设步伐,达到满
I. INTRODUCTION Partial prestressing is a new concept proposed by the International Prestress Association - the European Concrete Commission (FIP-CEB) in 1970. Partial prestressing is the structure that allows for large tensile stresses under operating loads, but the crack width must be controlled. Therefore, the construction of partially prestressed concrete bridges will certainly receive encouraging economic results. At present, the beam bridge commonly used in the forest area is basically an ordinary reinforced concrete simply supported beam bridge. However, there are only a few full bridge and limited-stress bridges in the forest area. In this situation, in order to speed up the pace of the bridge construction in the forest area, it is full