Funding for this research was provided by:
Natural Science Foundation of Beijing Municipality (9182017)
Cooperation Project of the Developmen- t Research Center of China Earthquake Administration (Y802701901)
Cooperation Project of Beijing Municipal Institute of Labor Protection (PXM2018 178304 000010)
Article History
Received: 11 November 2018
Accepted: 6 August 2019
First Online: 13 August 2019