Pseudo-dynamic Research On Three Story One-span Post-tensioned Precast Prestressed Concrete Frame

Pre-stressed fabricated concrete frames are assembled by pre-cast pre-stressed beamsand columns. These components are hoisted in site and the tendons are passed through themoiré pipes to form pre-stressing force in the joints of the frame, then the frames areformed. Post-tensioned precast prestressed structure can improve the mechanization level,reduce the labor intensity, speed up the construction progress and provide a new way forthe development of future architectural structure.Pseudo-dynamic test was conducted on three story one-span post-tensioned precastprestressed concrete model frame. Failure mechanism, deformation properties, rigiditydegradation and energy dissipation capacity of the frame were investigated. The results ofstudy show that the post-tensioned precast prestressed frame has strong deformationrecovery capabilities under the effect of horizontal earthquake, there is no obvious rigiditydegradation, and the biggest story drift angle meet requirements of code for seismic designof buildings. Under the restriction of the prestressed reinforced, the plastic hinge firstlyappears at beam end and there is no slight crack in the core area, the “strong column andweak beam” and “strong node” design requirements can be satisfied.The results obtained from elastic time-history analysis using Midas/Gen are comparedwith the test results, indicating that the displacement of the analytical model is close withthe results of the test structure. Then I use the program to proceed elastic-plastictime-history analysis for the test frame, it shows that the structure has better seismicperformance of failure. At last, elastic-plastic time-history analysis of test frame isproceeded under four different kinds of seismic waves, whose peak acceleration aremodified in the requirements of rare earthquake when seismic precautionary intensity is7(0.15g), it shows that the structure has better seismic performance.