Nonlinear Simulation Of Reinforced Concrete Local T-Shaped Column Transfer Story Joint Within Tall Buildings

In the current vogue of postmodemism,the ripe and perfect development in thespatial structural analysis technology is in straightforward advance,this make thecomplexity of the structure geometry and the new innovations in structural skyscrapers becoming possible.In the super tall building structures,with the nature of close communication between the structural engineer and the architect,the changes in technology have been tremendous to meet the dally update strategies of human living.These strategies are to include business arcades in the first stories;offices in middle stories;and living apartments in the top stories;also the parking spaces in the substructures.As the building increase in height,different structures systems are needed for reasons of efficiency and multipurpose required functions.These sudden changes of the load transfer path require the altemative transfer structures systems.called transfer story/floor.There are many different types of transfer floor such as beam,haunched beam,thick slab boxes,inclined column and truss.In the last few years a new type oftransfer story,the T-shaped thin—walled column has been experimented in building design without design code at present.Hence theoretical and experiment research are very important to enhance the safety and reliability ofthis kind transfer.Knowing that the combination of three—dimensional geometrically complex and the loading conditions of the transfer storystructures system in tall building,as well as the three—dimensional nonlinear behaviors of the reinforced concrete(RC)make conventional techniques insufficient to predict the behavior of the RC structures accurately;considering that some of these tall buildings structures are located in seismic zones and subjected to dynamic loads,the path--dependent three-dimensional nonlinear analysis ofthe haunched beam and T-shaped thin-walled transfer j oint is indispensable for correct simulation of their failure behaviors under diverse loading.Some efforts have been made experimentally to explore the elastic response mechanism of the specimen to study.Based on these research results and exploiting the ANSYS program capabilities,the current research will use those results to enhance the simulation of structural nonlinear performance of this complex reinforced concrete transfer structure type especially will address the nonlinear failure behavior of a haunched beam and T-shaped thin-walled column local transfer storyjoint is analyzed.Thus a nonlinear numerical analysis applying the finite element models witll ANSYS program is conducted by setting a set of material constitutive models based on the concrete and reinforcement materials nonlinear stress-strain relation. For verification of the technique in this paper,a so—called static vertical pressure load is added on the simulated specimen.By controlling the failure development and mechanism,peak·hardening behavior of the ultimate load on the transfer joint is obtained to predict the nonlinear failure mechanical characteristics ofa reinforced concrete.The mechanical characteristics analyzed include the stress distribution,cracks occurrence and propagation,and the failure pattem. ANSYS-nonlinear numerical results are compared with experimental data.Numerical result shows that nonlinear fmite element applied with ANSYS techniques can predict the failure mechanism and indicate failure sequence at the various stages of loading ofthis types ofRC transferjoint in the elastic range。...