Design And Elastic-plastic Analysis For A Training Hall With Long-span Prestressed Frame Structure

Along with the continuous progress and development of society,requirements for the industry and civil construction are more and more now.It is not uncommon which requiring large columns and large span structure.The prestressed concrete technology just provides a solution to these requirements,the deflection and cracks of the building structure are also has better controled,while it has a smaller cross-section and less with the amount of steel and thus has a very good economic performance.So that the application of prestressed concrete technology is more and more common,and it is well applied in public and civil buildings which has large-span.Nowadays,prestressed concrete technology has been widely used in engineering examples,but when we talked about long-span prestressed concrete frame structure,there are still blind spots and shortcomings in the design.In this paper,starting from the design level of prestressed beam,we will refer to the architectural drawings of the design institute and then build the structural model by myself.With a complete pre-stress tendon layout is a prerequisite for post-calculation analysis,so the linear layout problem is the top issues of the design.And the deflection and crack of the large span concrete beam are checked.Finally,the whole structure is analyzed by periodic and modal,and all the parameters of the structure are in accordance with the relevant regulations.It is very important to select the prestressing force in prestressed concrete structure.The prestressing force not only affects the structural performance,but also involves the energy dissipation and seismic performance of the structure.In this paper,the seismic design method based on displacement is used to compare the seismic performance of the same structure in two sets of prestressing forces by a set of contrast of Pushover analysis.It can be seen that the high prestressing force can not be used too much.Under normal circumstances,the secondary PPR can have good seismic performance.It can meet the corresponding seismic fortification requirements,but also has better energy consumption and ductility.In this paper,a group of seismic waves is input into the structure by using finite element software which named Midas-building,and the dynamic elasto-plastic time history analysis is carried out.The relationship between the displacement angle,the displacement curve of the vertex displacement and the plastic hinge under the large earthquake is obtained,and the corresponding analysis is carried out and compared with the standard,which brings some research and reference value to the engineering practice.