Seismic assessment of high-rise buildings through dynamic nonlinear analysis

Abstract

This paper present a seismic assessment of high-rise buildings using dynamic nonlinear analysis. The work touches upon an urgent problem of ensuring the stability of high-rise buildings under seismic load and preventing their destruction. A mathematical model has been built to investigate the effect of seismic activity on high-rise buildings in the Sichuan province (China). Pearson’s test was used to compare the statistical dependence between variables in the study period. Values with a statistical significance of p ≤ 0.05 were considered statistically significant. The probability of earthquakes of 8 magnitude and above was found to be 5% with a frequency of recurrence of 3900 ± 400 yrs, p ≤ 0.001. The paper presents the technique of refractive geophysical research. The seismic reliability index was n = 3.2 at t = 5 s. The standard deviation was 2% and the χ2 statistic was 0.95. The overall (0.59, or 59%) and conditional (0.06, or 6%) risks of failure under seismic load were calculated for high-rise buildings with a service life of 100 years. The coefficients of seismic activity were as follows: 3.203 at the conditional risk level of 5%; 2.97 at the conditional risk level of 10%; and 2.523 at the conditional risk level of 30%.