Abstract
It is a hot research topic to perform the dynamic interaction analysis between the engineering structure and the soil by using the time-domain method. This paper studies the seismic behaviour of the layered sites and the seismic response of the structures using the viscous-spring artificial boundary theory. The artificial boundary model of viscous-spring is initially based on homogeneous foundation. For the layered site (Foundation), the traditional homogeneous model or equivalent load input mode is not suitable, which may bring great error. By introducing the changes of coefficients and phases of reflection and transmission of seismic waves at the interface between layers, an improved method of equivalent load input mode of traditional viscous-spring artificial boundary model is proposed. This new wave model can simulate the propagation law of seismic wave in layered site more accurately, which is available for the seismic performance of engineering structure under the condition of large and complex layered site. At last, the simplified homogeneous model, the equivalent load input method and the improved layered model input method are used to study the seismic response of the engineering example. It is shown that the results calculated by the three methods are different, which shows that the homogeneous foundation model and the conventional equivalent load input method of seismic wave cannot simulate the seismic force accurately, whereas the improved wave input model can better reflect the characteristic of traveling wave in layered sites.
Highlights
Complex layered sites are often encountered in the construction process of various large-scale civil, water conservancy and transportation projects
This paper study the seismic behavior of layered sites and has developed an improved seismic input mode of the viscous-spring artificial boundary theory based on the characteristic of traveling wave
For the seismic response analysis of layered site, its dynamic characteristics have an important influence on the structural dynamic response
Summary
Complex layered sites are often encountered in the construction process of various large-scale civil, water conservancy and transportation projects. The analysis of structure-foundation interaction using time-domain method is a hot topic, in which the viscous-spring artificial boundary performs well in the application of computational precision, stability and large-scale finite element software, and its ground motion input mode is easy to simulate the propagation process of seismic wave and the non-uniform change of field motion caused by the oblique incidence of seismic wave, so it has been widely used [12]. One method is to take the soil parameters adjacent to the foundation as homogeneous soil model instead of the layered sites Another method is based on layered foundation model but adopt conventional equivalent load mode of ground motion input mode, which only converts incident wave and reflected wave at the free top surface into equivalent load form and inputs them into the system to solve the dynamic response of the whole system. Engineering example demonstrates the accuracy of the new seismic input mode and its implementation
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
