Push-over Analysis For Tall Frame-shear Wall Structure With Reinforced Concrete Short Columns

According to the existing seismic design theory in our country, we should follow the design principles of "strong column and weak beam, strong shear capacity and weak bending capacity" and be required accord with the design standards of "no damage in small earthquake, no falling in strong earthquake" when seismic designing. It’s easier to meet the requirements for the common structure form according to the conventional design, so some potential problems in the process of designing are easy to be ignored by designers, for example, reinforced concrete short columns structure has some worse seismic behavior. In the programming process. affected by the height of structure, height of the beam, stair landing and infilled wall and so on, the structure will form short columns often inadvertently. While for the seismic design of reinforced concrete short columns, the specification has also no manipulable provisions. So, the seismic design of structurals with reinforced concrete short columns becomes a problem. There are many researches on the seismic behavior of reinforced concrete short columns and the seismic performance improvement measures and researches on integral structure are less.For the integral structure containing many columns and the researches are relatively less both on experimental analysis and theoretical analysis. But with the problems being easy to appear in practice, it’s especially needed to study on the seismic performance of the integral structure containing many reinforced concrete short columns.This paper puts a engineering example as research object and carried out Pushover analysis for this example. Due to the building function and height of beams, there are a large number of short columns along the height range and the structure becomes a frame-shear wall structure with concrete short columns. And due to the lack of guidance and data of the structure design, designers can not judge the failure mode and seismic performance of the structures in earthquake, having many difficulties in the design process. In view of the above problems, this paper puts a engineering example as research objec. makes Finite element modelingang,makes mode analysis, carries out conventional elastic design and push-over analysis under frequent and rare earthquake in the Seismic fortification intensity is6degrees, the design value for0.05g base acceleration and Seismic fortification intensity is7degrees, the design value for0.1g base acceleration region.The paper describes the action of structure deformation characteristics, destruction form of the integral structure and the characteristics of failure, the concrete’s maximum stress distribution of the vertical component and component cracking characteristics in different intensity earthquake.And Study the component parts of the plastic hinge occurs, the plastic hinge type and degree of development of plastic hinges.Then proposed structure of the weak parts, and using capacity spectrum method to evaluated seismic performance under rare earthquakes.This paper uses Midas Gen structural finite element analysis software to make push-over analysis about a project example with many reinforced concrete short columns,and use the ATC-40capacity spectrum method for seismic performance evaluation,analyse the damage form and the overall work performance under frequent and rare earthquake in6degrees and7degrees.Finally,we make a seismic performance summary about the project example’seismic behavior and hope that analysis method in paper and analysis method have reference for after structure designs anticipation of providing some certain references for such structures.