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An improved multidimensional MPA procedure for bidirectional earthquake excitations.

Wang F, Sun JG, Zhang N - ScientificWorldJournal (2014)

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: College of Architecture & Civil Engineering, Dalian Nationalities University, Dalian 116600, China.

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.

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Strength reduction factor Rs spectra.
© Copyright Policy - open-access
Related In: Results  -  Collection


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fig1: Strength reduction factor Rs spectra.

Mentions: During the past years, some researchers have presented convenient Rs spectra models [32–34]. To combine with current Rs spectra, it is recommended in this paper to establish Rb spectra by analyzing the relationship between Rs spectra and Rb spectra. The approach is as follows: establish Rb/Rs ratio spectra based on different soil sites, analyze the influences of soil site classification, ductility factor, and participation coefficient ratio of vibration mode of two spindle axes, and establish simplified relationship of Rb/Rs. On this basis, establish Rb spectra with Rs spectra and simplified relation of Rb/Rs. The Rs spectra for three kinds of soil sites are shown in Figure 1.


An improved multidimensional MPA procedure for bidirectional earthquake excitations.

Wang F, Sun JG, Zhang N - ScientificWorldJournal (2014)

Strength reduction factor Rs spectra.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4129155&req=5

fig1: Strength reduction factor Rs spectra.
Mentions: During the past years, some researchers have presented convenient Rs spectra models [32–34]. To combine with current Rs spectra, it is recommended in this paper to establish Rb spectra by analyzing the relationship between Rs spectra and Rb spectra. The approach is as follows: establish Rb/Rs ratio spectra based on different soil sites, analyze the influences of soil site classification, ductility factor, and participation coefficient ratio of vibration mode of two spindle axes, and establish simplified relationship of Rb/Rs. On this basis, establish Rb spectra with Rs spectra and simplified relation of Rb/Rs. The Rs spectra for three kinds of soil sites are shown in Figure 1.

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: College of Architecture & Civil Engineering, Dalian Nationalities University, Dalian 116600, China.

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.

Show MeSH
Related in: MedlinePlus