title: An improved multidimensional MPA procedure for bidirectional earthquake excitations.
abstract: Presently, the modal pushover analysis procedure is extended to multidimensional analysis of structures subjected to multidimensional earthquake excitations. an improved multidimensional modal pushover analysis (IMMPA) method is presented in the paper in order to estimate the response demands of structures subjected to bidirectional earthquake excitations, in which the unidirectional earthquake excitation applied on equivalent SDOF system is replaced by the direct superposition of two components earthquake excitations, and independent analysis in each direction is not required and the application of simplified superposition formulas is avoided. The strength reduction factor spectra based on superposition of earthquake excitations are discussed and compared with the traditional strength reduction factor spectra. The step-by-step procedure is proposed to estimate seismic demands of structures. Two examples are implemented to verify the accuracy of the method, and the results of the examples show that (1) the IMMPA method can be used to estimate the responses of structure subjected to bidirectional earthquake excitations. (2) Along with increase of peak of earthquake acceleration, structural response deviation estimated with the IMMPA method may also increase. (3) Along with increase of the number of total floors of structures, structural response deviation estimated with the IMMPA method may also increase.
authors.affiliation: College of Architecture & Civil Engineering, Dalian Nationalities University, Dalian 116600, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.affiliation: College of Architecture & Civil Engineering, Dalian Nationalities University, Dalian 116600, China.
authors.forename: Jian-Gang
authors.initials: JG
authors.lastname: Sun
authors.affiliation: Dalian Polytechnic University, Dalian 116003, China.
authors.forename: Ning
authors.initials: N
authors.lastname: Zhang
mesh_terms: D000465:Algorithms; D003252:Construction Materials; D055866:Earthquakes; D005844:Geology / Q000379:methods*; D055883:Structure Collapse / Q000517:prevention & control; D014732:Vibration