手法を比較

	非線形時刻歴解析	応答スペクトル解析
分野	土木工学	土木工学
系統	Process / pipeline	Process / pipeline
提唱年	1959	1941
提唱者	Nathan M. Newmark	George W. Housner
種類	Time-stepping numerical method for earthquake engineering	Linear modal analysis for earthquake response
原典	Newmark, N. M. (1959). A method of computation for structural dynamics. Journal of the Engineering Mechanics Division, 85(3), 67-94.	Housner, G. W. (1941). Calculating the response of an oscillator to arbitrary ground motion. Bulletin of the Seismological Society of America, 32(2), 143-149.
別名	Nonlinear dynamic analysis, Step-by-step integration, Time domain analysis	Elastic response spectrum, Design spectrum method, Modal response spectrum
関連	4	4
概要	Nonlinear time-history analysis is a numerical method that solves the equations of motion step-by-step in the time domain, using recorded or synthetic earthquake ground motions as input. Developed by Newmark in 1959, this approach captures the full dynamic response of structures including material nonlinearity, geometric effects, and energy dissipation mechanisms.	Response spectrum analysis is a linear modal method for estimating earthquake-induced forces and displacements in structures. Introduced by Housner in 1941, this approach uses design spectra that represent the maximum response of single-degree-of-freedom oscillators at different natural frequencies to compute the structural response by combining modal contributions.