Primary Study On Vulnerability Of High-Rise Buildings

In recent years，with increasing development of the economy and urbanization,more and more high-rise buildings are built in China, as a result, the vulnerability ofhigh-rise buildings becomes a high-valued subject. While with a few of earthquakedamages, the proper method to study the vulnerability of high-rise buildings should beearthquake response simulation based on the summary of earthquake damages. In thispaper, damages of high-rise buildings in Wenchuan Earthquake, Chi-chi Earthquake andCaracas Earthquake suggest that the long-period parts of seismic spectrems should beconsidered as a factor of vulnerability. In this paper, characteristic period is used as aparameter of spectrums, and multivariate statistical analyses are applied to analyze thenumerical results gotten by numerical simulation.Major work and conclusions of this paper are listed as follows:1Based on the analysis of earthquake damages, two models of real high-risebuildings as examples are built to perform time-history analysis under695cases. Therandomly-selected seismic waves are grouped according to the characteristic period ofeach wave, which is calculated according to ACT-06. In this paper, the maximalinter-story drift is a criterion of the damage of buildings. It has been counted that thevulnerability matrix and the damage index of building under earthquakes in each groupwith different peak ground acceleration.2In this paper, the variance analysis and the conjoint analysis are applied toexplore the effect of two factors, peak ground acceleration and characteristic period, onhigh-rise buildings seismic damages. The variance analysis of maximal inter-story driftindicates that characteristic period has a strong statistical relationship with damages aswell, and there is an interaction between the peak ground accelerations and thecharacteristic period which statistically relates to seismic damages. Meanwhile, thevariance analysis represents that although the interaction is a weaker factor compared topeak ground acceleration, its effect on damages is as strong as characteristic period. Theconjoint analysis reflects that the great contribution of the characteristic period to thevulnerability of high-rise buildings could not be ignored.3According to the results of two examples, the logistic model is used to predictdamages of high-rise buildings under earthquakes with different characteristic periodand peak ground acceleration.