Search

Your search keyword '"CAO Zhenggang"' showing total 174 results
Start Over Author "CAO Zhenggang"
174 results on '"CAO Zhenggang"'

49. A hybrid non‐parametric ground motion model of power spectral density based on machine learning.

Author

Ding, Jiawei, Lu, Dagang, and Cao, Zhenggang

Subjects
*GROUND motion, *EARTHQUAKE engineering, *STANDARD deviations, *REGRESSION analysis, *RESEARCH personnel, *EARTHQUAKE hazard analysis
Abstract

In the fields of engineering seismology and earthquake engineering, researchers have predominantly focused on ground motion models (GMMs) for intensity measures. However, there has been limited research on power spectral density GMMs (PSD‐GMMs) that characterize spectral characteristics. PSD, being structure‐independent, offers unique advantages. This study aims to construct PSD‐GMMs using non‐parametric machine learning (ML) techniques. By considering 241 different frequencies from 0.1 to 25.12 Hz and evaluating eight performance indicators, seven highly accurate and stable ML techniques are selected from 12 different ML techniques as foundational models for the PSD‐GMM. Through mixed effects regression analysis, inter‐event, intra‐event, and inter‐site standard deviations are derived. To address inherent modeling uncertainty, this study uses the ratio of the reciprocal of the standard deviation of the total residuals of the foundational models to the sum of the reciprocals of the total residuals of the seven ML GMMs as weight coefficients for constructing a hybrid non‐parametric PSD‐GMM. Utilizing this model, ground motion records can be simulated, and seismic hazard curves and uniform hazard PSD can be obtained. In summary, the hybrid non‐parametric PSD‐GMM demonstrates remarkable efficacy in simulating and predicting ground motion records and holds significant potential for guiding seismic hazard and risk analysis. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

50. SEISMIC PERFORMANCE OF SIX-STORY FABRICATED STEEL FRAMES UNDER PSEUDO-DYNAMIC TESTING

Author

Du Peng, Wan Zongshuai, Liu Han, Cao Zhenggang, and Fan Feng

Subjects
Computer science, business.industry, Bolted beam-height adjustable steel beam-to-column connection, Buckling-restrained brace, Fabricated steel system, Pseudo-dynamic test, Geography, Planning and Development, Structural engineering, Development, business, Dynamic testing
Abstract

In order to study the seismic behaviors of fabricated steel frames with bolted beam-height adjustable steel beam-to-column connections (BHA connections), a six-story steel frame was designed to run pseudo-dynamic experiments. Experiments were first carried out with the steel frames with and without buckling-restrained braces (BRBs) under three different types of seismic records under 35 gal and 70 gal. Then the seismic records of EL_CENTRO amplified from 220 gal to 1,600 gal were loaded on the braced frame. Results showed that there was no detachment, sliding, or yielding detected in BHA connections. After BRBs were installed, the story drift and the top-story maximum displacement could easily meet the codes, and the structure was still working in the elastic stage under 620 gal. It could therefore be concluded that BHA connections have excellent seismic performance and they are suitable for application in fabricated steel frames. The braced frame using BHA connections has good lateral stiffness and energy dissipation capacity.

Published
2017

Catalog

Books, media, physical & digital resources
See catalog results