| Due to the increasing shortage of urban land and the increasing number of super high-rise buildings,the study of seismic performance of super high-rise buildings is particularly important.The seismic performance analysis of super high-rise buildings is inseparable from the stable and reliable dynamic analysis algorithm.At present,a single implicit or explicit stepwise integration algorithm is mostly used to analyze the seismic performance of super high-rise buildings.Because of the characteristics of super high-rise structure with many degrees of freedom,super-multiple elements and complex element sections,implicit algorithms face the challenge of computational convergence when solving problems such as strong nonlinearity of materials and large geometric deformation,explicit algorithms face computational efficiency problems,and the parallel computing of explicit algorithms faces the difficulty of damping matrix processing.The development of dynamic analysis algorithms with computational accuracy,computational stability and computational efficiency is of positive significance for the study of seismic performance of super high-rise buildings.Considering the development characteristics of inelastic behavior of super high-rise structures in time and space domain,and combining the advantages of implicit algorithms with computational efficiency and the advantages of explicit algorithms for calculating strong nonlinearity,the implicit algorithm and the explicit algorithm are mixed in time domain,space domain and time and space domain respectively in this paper.Based on the self-developed finite element analysis platform,the temporal hybrid dynamic algorithm(THDA),spatial hybrid dynamic algorithm(SHDA)and spatio-temporal hybrid dynamic algorithm(STHDA)are developed.The accuracy of three types of hybrid algorithms is verified by the seismic time history analysis of a series of building structures,and then the performance is compared with some implicit and explicit algorithms.Mainly completed the following work:(1)Implicit iterative algorithms and explicit algorithms for hybrid algorithms are determined by preliminary screening,integration and comparison of a series of algorithms.Based on the classicity,timeliness and practical application of dynamic algorithms,the screening of a series of implicit iterative algorithms and explicit algorithms is completed.The preliminary screened algorithms are integrated on the self-developed finite element analysis platform,and the calculation results of several dynamic algorithms are verified by a single column model.Three finite element models of building structures,i.e.a low-rise RC frame(S1),a medium-rise RC frame(S2)and a medium-rise RC wall frame(S3),are generated,and then the seismic inelastic time-history analysis is carried out with integrated dynamic algorithms.The implicit iteration algorithms are evaluated by analysis parameters of the number of iterations and calculation time in time history analysis,and the explicit algorithms are evaluated by analysis parameters of the stability step and calculation time in inelastic analysis,the implicit iterative algorithm and the explicit algorithm for the hybrid algorithm are finally determined.(2)Aiming at the inelastic development characteristics of super high-rise structures in the time domain,the temporal hybrid dynamic algorithm for inelastic time-history analysis of strong earthquake of super high-rise structures is proposed.The bidirectional and automatic switching strategy between the implicit algorithm and the explicit algorithm and the method of calculating initial conditions at swithching time are determined,a concise and efficient general framework of the temporal hybrid dynamic algorithm is proposed.Four types of temporal hybrid dynamic algorithm are implemented on the self-developed finite element analysis platform based on the filtered implicit iterative algorithms and explicit algorithms.The temporal hybrid dynamic algorithm is validated and its performance is evaluated considering the completeness factor,the deviation factor and the calculation time factor,through the seismic time-history analysis of the S3 structure.A finite element model of super high-rise frame-core-tube structure(S4)is established,and is analyzed by two temporal hybrid dynamic algorithms with relatively better performance,which are compared with a single implicit and explicit integration algorithm,the analysis results show the advantages of the temporal hybrid dynamic algorithm.(3)The spatial hybrid dynamic algorithm is proposed aimed at the inelastic development characteristics of super high-rise structures in the space domain,and the spatio-temporal hybrid dynamic algorithm is proposed in combination with the temporal hybrid dynamic algorithm.The the interface partition strategy with node segmentation and the interface prediction-partition calculation-interface correction iterative strategy are used to realize the coupling calculation between partitions,and a general framework of the spatial hybrid dynamic algorithm is proposed.Combined with the temporal hybrid dynamic algorithm,a general framework of the spatio-temporal hybrid dynamic algorithm is proposed.Two types of spatial hybrid dynamic algorithm and four types of spatio-temporal hybrid dynamic algorithm are implemented on the self-developed finite element analysis platform based on the filtered implicit iterative algorithms and explicit algorithms.The accuracy of the spatial hybrid dynamic algorithm and the spatio-temporal hybrid dynamic algorithm is verified by seismic inelastic time-history analysis of a medium-rise RC frame structure(S5).Through the seismic inelastic time-history analysis of a high-rise RC frame structure(S6)and a super high-rise frame-core-tube structure(S7),the performance of three kinds of hybrid dynamic algorithm in time domain,space domain and time and space domain is evaluated,and the relatively optimal hybrid dynamic algorithm is determined. |
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