The Duration Effect of Pulse-Type Near-Field Earthquakes on Nonlinear Dynamic Analysis and Damage Evaluation of Hydraulic Tunnels

Current research trends in significant hydraulic engineering projects focus on investigating the seismological properties of intensity and frequency content pulse-type near-field earthquakes structural response. Conversely, duration impact is not expressly addressed seismic design code for underground buildings. Currently, various indicators as-recorded strong ground motions mainly consider effective initial acceleration component record. In contrast, velocity (EVD) original time-history record have rarely been addressed. Specifically, there a gap between To illustrate response, an EVD NFGM was used. This can be calculated excitations with set threshold values that enable quantitative examination effects. A fluid-hydraulic tunnel-rock interaction system built used to estimate response characteristics induced by different NFGMs. The investigation’s findings highlight inelastic dynamic damage degree are strongly affected EVD. Additionally, fixed value 5–95% showed excellent correlation coefficient also found most suitable alternative indicator replace index. addition, reduced methodology near-fault earthquake records presented validated, this method being improve efficiency analysis arched tunnels.