Finite Element Analysis On The Seismis Resistant Property Of The Different Form Of Connection Node Of The Adding Steel Stories On The Existing Building

The project of adding steel stories to the used/existing buildings occupies an increasingproportion in the activities of renovating the existing building depending on its peculiaradvantages on the technology and economic. The beam-column joints through the renovationundoubtedly become the key part in the buildings, which directly influence the stress performanceof the whole structure. Therefore, the research of the anti-seismic performance of the joints bydifferent types of connection is beneficial to understand the mechanical properties of thenodes/joints and improve the design of nodes form. The research of the anti-seismic performanceof the nodes has great significance and value both in the relevant theoretical research and in theengineering practice.In the early experiment I designed four entity models with different connectingnodes in adding steel stories to the existing building. All the testing components areadded in steel columns which are I-beam at the top of the existing concrete columnsby the method of chemical bonded rebar. The new added steel columns and theoriginal concrete columns have different connecting form, such as Articulated-U steelhoop reinforcement, Rigid-carbon fiber reinforced, Rigid-steel reinforcement andRigid. In the experiment, I added the low period repeat load to the four solid/entitymodels and get their hysteretic curves and other relevant parameters. And then Ianalyze the pros and cons of their anti-seismic performance by these parameters.In this dissertation, on the basis of the above-mentioned experiment, using thenode solid model which has an optimal seismic performance in the experiment as asample, I use ANSYS, the finite element analysis software, to establish the finiteelement node model. In addition, I also determine the form of different model units,define the material properties of every unit, set up the real constant, select a suitableyield criterion. While all the reinforced units are set up in the way of node, I use the entity modeling method to establish the concrete unit, determining the grid, applyingconstraint conditions, loading and solving.In this dissertation, a whole simulation of the forced and destroyed process forthe node models under low period repeat load has been done. And I make acomparison the result of the finite element node model and the node solid model, andmake a conclusion that the results of the finite element analysis and the experimentare basically consistent. And that proves the finite element node model can reflect theforce situation of the node. On the basis of this node model, a new node finite elementmodel can be drawn by changing node connection. And then through applying a lowperiod repeat load to the new node model, I can obtain its hysteresis curves and otherrelated parameters. And comparing it with the original model, I can get the differencesof the anti-seismic performance between/among these finite element node models.And I emphasize the differences of the anti-seismic performance index such asdissipative capacity and ductility performance of the different form of connectionnode models which are under low period repeat load.