| The current "code for seismic design of buildings（GB50011）for the seismic design target of" repairable "earthquake in the description of the makes the performance of the structure under the action of" shock "is not very clear,this article tries to provides basis and reference for construction engineering design,in accordance with the specification of 8degrees of class b and class c RC frame structure design requirements,design respectively the RC frame structure,class b and class c under the action of the two kinds of structure earthquake damage analysis,to study the seismic performance of these two kinds of structure.（1）According to the provisions of the code,two RC frame structure buildings of Class B and Class C were designed with PKPM software respectively.The fortification intensity was8 degrees,and the number of structural floors,layout and section size were the same.The difference was that the earthquake resistance grade of Class B structure was 1,while that of Class C structure was 2.In this paper,the reinforcement of beam and column of class B and class C RC frame structure is compared and analyzed,the main results of the structure under frequent earthquake are analyzed,and the elasto-plastic displacement Angle between layers under rare earthquake is checked and analyzed.（2）Respectively for class b and class c RC frame structure design by ABAQUS finite element analysis model is established,and the model for modal analysis and checking,SATWE and ABAQUS in elastic stage,the calculation mode and cycle is roughly same,for more than two types of structure under severe earthquake damage analysis,the maximum interlayer displacement Angle of b class structure at 1/688,the structure of the c class maximum interlayer displacement Angle is 1/650,two kinds of main structure of the basic structure in good condition,can continue to use,does not require repair structure to achieve the requirement of the "small earthquakes not bad",two finite element models in accordance with the design requirements.（3）For class b and class c were conducted under the earthquake resistance of the RC frame structure dynamic elastic-plastic time history analysis,two kinds of structure under the action of the three waves of floor displacement,the interlayer displacement Angle and structure of the compression and tensile damage such as comparative analysis,the selection of structure response of the largest component damage on the structure of the calculation results of two kinds of comparative analysis,the analysis results show that: Under seismic fortification,moderate damage occurred to Class B and Class C structures,among which the compression damage of the end of the frame beams of two types of structures was moderate damage.The damage factor of Class B was about 0.4,and that of Class C was about 0.5.The compression damage of the bottom and top of the frame columns of each layer were all mild damage,and the compression damage factor was less than 0.3.The compression damage at the beam-column joint belongs to the medium damage,the damage factor of class B is about0.4,and the damage factor of class C is about 0.45.The plastic strain of the longitudinal bars at the bottom of the first frame column of class B structure is about 0.0035,while the plastic strain of the longitudinal bars at the bottom of the column of class C structure is about 0.005.The plastic strain of the longitudinal bars at the end of the one-story frame beam of class B structure is between 0.0018 and 0.006,while the plastic strain of the longitudinal bars at the end of the beam of class C structure is between 0.002 and 0.008.Because the damage of frame column and frame beam of Class B structure is obviously less than that of Class C structure,and the plastic strain of yield bar is less than that of Class C structure,Class B structure shows better aseismic performance than Class C structure.（4）For class b and class c RC frame structure under severe earthquake dynamic elastic-pl astic time history analysis,two kinds of structure under the action of the three waves of floor displacement,the interlayer displacement Angle and structure of the compression and tensile damage such as comparative analysis,the selection of structure response of the largest compo nent damage on the structure of the calculation results of two kinds of comparative analysis,t he analysis results show that: Under rare earthquakes,both Class B and Class C structures are seriously damaged,among which most of the compression damage of the beam ends of the fra me beams of the two types of structures belongs to medium damage with a damage factor of a bout 0.5,while the compression damage of a few beam ends of the first and second floors of t he structure belongs to serious damage with a damage factor of about 0.65 for Class B and 0.8for Class C.The compression damage at the top and bottom of each frame column and most of the beam-column joints belongs to the medium damage,and the damage factor is about 0.5.The compression damage at the beam-column joints of the first and second floors belongs to t he serious damage,and the damage factor is about 0.7.The plastic strain of most longitudinal bars at the bottom of frame column of type B structure is about 0.005,and the plastic strain of a few longitudinal bars is more than 0.009,while the plastic strain of part of longitudinal bars at the bottom of column of type C structure is about 0.006,and the plastic strain of the other part is about 0.011.The plastic strain of most longitudinal bars at the end of B type frame bea m is between 0.003 and 0.008,while that of most longitudinal bars at the end of C type frame beam is between 0.005 and 0.008.The compression damage of the beam-column member of t he B type structure is significantly less than that of the C type structure,the steel bars produci ng plastic strain of the frame column are significantly less than that of the C type structure,an d the plastic strain value of the yield steel bars in the beam-column member is also less than t hat of the C type structure,showing better seismic capacity than that of the C type structure. |
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