The prestressed-reinforcement steel-pipe post scheme was implemented successfully in construction of Block No.

The change method of prestressed steel isn t described basically in specialized works.

The laws of variation of mechanical behaviors with the temperature are investigated for prestressed steel and non_prestressed steel.

In bonded prestressed concrete beam,the depth of compression is not only related to the ratio of tension reinforcement,but also is related to the kinds and schemes of prestressed reinforcement and common reinforcement and the lever of stress of the prestressed reinforcement.

If the prestressed reinforcement is arranged in certain cylindrical surface, the formula can be simplified peatly and the equivalent load can be expressed by the geometric property of curve of the reinforement along the developed cylindrical surface.

Since pre-stressed concrete box girders usually have a large number of curve pre-stressed tendons,a type of combined element is presented to simulate the prestressed tendons of box girders,and then the number of elements can be significantly reduced.

The formula for accurate calculation on the theoretical value of elongation for the post-tensioning prestressing steel has been derived from the principle of prestress losses due to friction.

Here both the more reasonable arrangements of prestressing steel in prestressed concrete beams with relevant observation also conducted in tests, and the experimental study of the better reinforcements in square reinforced concrete slabs, are given with some details.

The high temperature test for prestressing tendons was made,and the thermal creep strain model and thermal creep strain rate model were built according to the testing results.

Design methods, included the principle of defer-mining span and section, the selection of prestressing tendons and anchorages, the analy.