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现场生产的预应力钢筋混凝土构件一般采用后张法,其预应力筋用Ⅳ级钢虽有用钢量少的优点,但因Ⅳ级钢供应紧张,规格不齐,锚具加工比较麻烦等原因故而目前Ⅱ级钢仍被广泛地作预应力筋。本文就以Ⅱ级钢粗钢筋为预应力筋的钢筋混凝土屋架,对预应力筋伸长值测定,张拉程序等问题作些探讨。众所周知,张拉预应力钢筋时要测定预应力筋的实际伸长值,实际伸长值与计算伸长值如相差不多,即认为张拉符合要求。这
Site-produced prestressed reinforced concrete members generally adopt the post-tensioning method. Although the IV steel with prestressing tendons has the advantage of less steel, it is due to the tight supply of IV steel, irregular specifications, and the troublesome processing of anchors. Currently grade II steels are still widely used as prestressing bars. This paper discusses the problems of determining the elongation value of prestressed tendons and the tensioning procedure by using reinforced concrete truss with prestressed tendons. It is well known that the actual elongation of prestressed tendons must be determined when the prestressed tendons are tensioned. The actual elongation is similar to the calculated elongation, ie the tension is considered to meet the requirements. This