Analysis On Seismic Performance Of Concrete Frame-wall Structures Reinforced With High-strength Steel

The popularization and application of the high-strength steel on concrete structures is an important measure to realize energy-saving and emission-reduction in China.It will be helpful to make the conservation and rational use of resources and energy,will be helpful to promote the scientific development of engineering construction,will be helpful to promote the structural adjustment and transformation of construction,will be of great significance to carry out sustainable developments.In China,HRB335 bars have been replaced by HRB400 bars completely for the moment,the popularization and application of HRB500 bars are carried out,the development of HRB600 bars are completed.And some experimental investigations of concrete members reinforced with high-strength steel have been carried out by several scientific research institution,but few studies focus on seismic behaviors of frame-wall structures reinforced with HRB500 and HRB600.In this analysis,several frame-wall structures on the Zone of Fortification Intensity 7(0.15g),8(0.3g)and 9(0.4g)in China reinforced with HRB400,HRB500 and HRB600 bars respectively,are designed confirming to the latest draft of the revising Code for the Design of Concrete Structures.Then inelastic seismic response analyses of the frame-wall structures with inputs of ground motions are conducted by Perform-3D.The seismic response rules and seismic performances of the RC frame-wall structures reinforced with HRB500 and HRB600 bars are compared with those frame-wall structures reinforced with HRB400 bars.After the further comparison and research,main conclusions from the works are got as following:1)The maximum displacements of the frame-wall structures reinforced with HRB500 and HRB600 bars are roughly the same as those of the frame-wall structure reinforced with HRB400 bars.Under ground motions in rare earthquake,with the increase of the strength grade of reinforcement,the most story drift angle of the structures are increasing slightly,and the maximum of top displacement of the structures are increasing slightly.2)Under ground motions in fortification earthquake and rare earthquake,the tendency of the floor shear along the floor of the frame-wall structures reinforced with HRB500 and HRB600 bars are roughly the same as those of the frame-wall structures reinforced with HRB400 bars,and the maximum of floor shear are emerged in the basement.3)Under ground motions in fortification earthquake and rare earthquake,the tendency of the floor shear distribution of the frame along the floor of the frame-wall structures reinforced with HRB500 and HRB600 bars are roughly the same as those of the frame-wall structures reinforced with HRB400 bars.4)Under ground motions in fortification earthquake and rare earthquake,with the increase of the strength grade of reinforcement,the outputs of plastic hinges of beams,columns and shearwalls of the frame-wall structures are decreased obviously.5)Under ground motions in fortification earthquake and rare earthquake,the performance assessments of the frame-wall structures reinforced with HRB500 and HRB600 bars are the same as those of the frame-wall structures reinforced with HRB400 bars,depending on the most story drift angle.Under ground motions in rare earthquake,the performance states of frame-wall structures on the Zone of Fortification Intensity 7(0.15g)and 8(0.3g)are not severe broken,the performance states of frame-wall structures on the 9(0.4g)are medium broken.Then the most story drift angle of the frame-wall structures reinforced with HRB400,HRB500 and HRB600 bars are less than 0.01 rad,which can satisfy the requirement in the Code for the RC frame-wall structures.It is shown that the seismic behavior of the frame-wall structures reinforced with HRB500 and HRB600 bars is good,which are designed confirming to the latest draft of the revising Code for the Design of Concrete Structures.