## 1 Introduction
[24] focused their research on the long-period velocity pulse contained in near-fault seismic records and found that, although the near-fault and far-fault records have the same PGA (peak ground acceleration), the larger stresses and displacements of the dam were attained under near-fault records. Moreover, according to the characteristics of near-fault earthquakes, many scholars have conducted correlation analysis. [PERSON] and [PERSON] [25] proposed a seismic demand model of dams to estimate the vulnerability of the gravity dam subjected to the near-fault earthquakes. [PERSON] et al. [26] compared the dynamic characteristics of a gravity dam under forward-directivity (FD) and normal near-fault seismic records, and the impacts of FD records on the seismic demand analysis of structures were discussed. [PERSON] et al. [27] established a new reliability assessment method for the dam, and the random dynamic response of rockfill dam slopes under near-fault earthquakes was evaluated. When studying the seismic dynamic characteristics of a dam, it was usually assumed that seismic wave propagated along a vertical direction, which was reasonable for far-field earthquakes, but the wave usually had the obliquely incident angle in near-field earthquakes. Many studies have shown that there are significant differences between near-field and far-field earthquakes [28; 29; 30]. In recent years, the dynamic response of dams under oblique incidence of near-field seismic waves has been widely concerned. [PERSON] et al. [31] proposed an input method of oblique seismic waves for three-dimensional calculation and found the seismic oblique incidence may cause a significant increase in the amplitude amplification factors of displacement, velocity, and acceleration of the arch dam. [PERSON] et al. [32] took radiation damping of foundation and design seismic component into account and found obliquely incident SV waves and P waves had a greater influence on the area near the interface of dam and foundation than that of vertically incident seismic waves. [PERSON] and [PERSON] [33] discussed the nonlinear behavior of a gravity dam under obliquely incident SV waves and P waves and pointed out the vertically incident seismic angle was not suitable for near-field earthquakes. [PERSON] et al. [34] analyzed the nonlinear behavior of a concrete gravity dam under obliquely incident SV waves and P waves. They found that the damage distribution of the dam was significantly different with the various incident angle. The main significance of this research lies in the improvement of the original research ideas. Most studies on the dynamic response of dam under near-fault ground motions were based on the uniform seismic excitation method with the assumption of the wave propagating along a vertical direction. This study investigates the nonlinear dynamic behavior of the CC-RCC gravity dam under near-fault pulse and non-pulse seismic records, and also considers the effect of the seismic incident angles. Taking a CC-RCC gravity dam in southwest China as an example, a three-dimensional nonlinear numerical model of the gravity dam-foundation system is built. From the Pacific Earthquake Engineering Research Center website (PEER) [35], three as-recorded near-fault earthquake records with pulse effect are chosen on the basis of the target response spectrum which is determined by the site conditions. In addition, three corresponding non-pulse ground motions are fitted by the above pulse ground motions' response spectra. Considering the P wave incidence of an earthquake, the above six seismic records are input through the equivalent load force calculation method which is based on the viscous-spring artificial boundaries. Adopting the concrete damage plasticity(CDP) model [5], the influence of pulse effect and multi-angle seismic incidence on the gravity dam are considered.