Seismic Performance Study Of High-rise Concrete Structure Based On The Elastic-plastic Analysis Method

In recent years, various number of high-rise concrete structure in Chinacontinue to emerge, and the current specification for this structure elasto-plasticseismic design and performance evaluation of narration is too simplified and fuzzy,especially in method selection, index selection key problems urgent to be perfectand unified.In order to investigate the problem of using elastic-plastic analysismethod to evaluate the seismic performance of an irregular ultra-limit concretestructure tall building, this paper takes Zhong Xiang international Hotel whichlocated in the Chi Zhou city of An Hui province as the object of the study.Then,thispaper chooses the dynamic elastic-plastic time-history analysis method and thestatic pushover analysis method,which use the finite element software EPDA/PUSHto study on seismic performance evaluation of elastic-plastic stage and analysis therelated to the structure. During the process of evaluating performance, the methodselection, software selection, performance evaluation parameter setting, data errorsand other related aspects are analyzed and discussed which based on the topdisplacement, maximum inter-story displacement angle, interlayer harmful driftangle, floor plastic hinge distribution and other key indexes. The mainachievements are described as follows.(1) An irregular ultra-limit concrete structure tall building should not usestandard simplified inelastic displacement calculation method, priority should begiven to the dynamic elastic-plastic time-history analysis method. If using thepushover analysis method, easy to cause some omissions, such as the neglect of theupper floors carrying capacity is insufficient.(2) The software EPDA/PUSH has the advantages of saving time modeling,but the treatment also have obvious flaws-image display effect is not good, thedata processing work tedious.(3) This paper suggests, if the interlayer displacement angle exceeds the codelimits, we should further examine the maximum interlayer harmful drift angle, thebest is ensure that the interlayer harmful drift angle in maximum interlayer driftangle is not more than50%.(4) This paper proves that the18~20layers of the main tower structure underlarge earthquake are relatively weak floors, should take appropriate measures to strengthen the shear capacity to improve the seismic performance of the wholestructure deformation. In addition, the junctions of annex and main tower and thetwenty-fifth layer of main tower should be taken some strengthen measures toprevent local failure.(5) Different static pushover analysis loading modes result a large of influence:Rectangular uniform distribution pattern and Elastic CQC seismic force distributionpattern is not applicable to an irregular ultra-limit concrete structure tall buildingpushover analysis; Triangular distribution pattern, which with the results ofdynamic elastoplastic time-history analysis has some error, although the numericalerror both in about10%, but the position of the maximum displacement angle floorin the former judge is offset.(6) Because of the large amounts of data statistics and related documentverification,We think it has the numerical relations between the maximumelasto-plastic inter-story displacement angle and elastic maximum inter-storydisplacement angle, the former is about8~10times of the latter. If the designer findit is in excess of the magnification range in the actual project, it would be better toreview process of modeling and calculation parameters.