Analysis On Seismic Performance Of Prestressed Concrete Frame Structures Under Rare Earthquake

In order to get a ductile frame with only beam hinges in yield mechanisms, or a limited-ductile frame with both beam and column hinges in yield mechanisms but without hinges in side column, the moment amplification factors for the end sections of side columns have been increased in "Specification for seismic design of prestressed concrete structures". After increment of the moment amplification factors of end sections of edge columns, whether prestressed frame structure can be capable to capable to achieve limited-ductile design requirements and have better seismic performance? These will require further study.In order to more better study seismic performance of prestressed frame structure, a series of non-linear dynamic time-history analysis is carried on prestressed frame structure with different fortification intensity,different aseismic grade and different moment amplification factors of end sections of edge columns'under rare earthquake by OpenSees. And this paper further completed comparison study on seismic performance of prestressed and non-prestressed frame in the same site condition and meeting the needs of the same construction engineering. In this paper, the main work and conclusions are as follows:â‘ Nonlinear dynamic analysis results show that: Prestressed concrete frame with anti-seismic grade equal to 1,2,3 respectively which are designed according to the "Specification for seismic design of prestressed concrete structures" and "Code for seismic design of buildings" can avoid the general failure and local failure and achieve the seismic fortification goal of "No Collapsing With Strong Earthquake" under severe earthquake;â‘¡Comparative studies on prestressed concrete frame with anti-seismic grade equal to 2,3 respectively which are designed according to the "Specification for seismic design of prestressed concrete structures" and "Code for seismic design of buildings" show that: Prestressed concrete frame by increasing the side-column end moment magnification factor which is designed according to the "Specification for seismic design of prestressed concrete structures", except top floor, can effectively reduce or even avoid the plastic hinge of side column; In low-intensity area, it is more difficult to avoid the plastic hinge of side column, because of super strong reinforcing of prestressed concrete beam; â‘¢Comparative studies on seismic performance of prestressed concrete frame and non-prestressed frame shows that: The seismic performance of prestressed concrete frame is generally not lowwer than the seismic performance of non-prestressed concrete frame in the same site condition and meeting the needs of the same construction engineering;â‘£Simulation analysis shows that: Prestressed concrete frames with anti-seismic grade equal to 2,3 respectively which are designed according to current codes can not avoid the plastic hinge of bottom columns; The example shows that: prestressed frame column in Intensity Region 8(0.3g) with anti-seismic grade equal to 2 designed by the bottom column moment capacity amplification factor of 1.5 formes a limited-ductile frame with both beam and column hinges in yield mechanisms but without hinges in side column under severe earthquake; For its better seismic performance, so it is feasible for the bottom column moment capacity amplification factor to take as 1.5 of prestressed frame column in Intensity Region 8(0.3g) with anti-seismic grade equal to 2.