Abstract
A series of one-dimensional (1-D) site response analyses were performed using the nonlinear (NL) and equivalent linear (EQL) approaches to assess the applicability of the Vietnamese earthquake-resistance design code TCVN 9386: 2012. Six soil profiles were selected from three districts in Hanoi (Vietnam). A number of ground motions compatible with the rock design spectrum were used as input for carrying out analyses. The results highlight that the calculated response is higher than the design spectrum for site class C and lower for site class D. The normalized response spectra of the EQL approach results are higher than those of the NL approach. Moreover, the peak ground accelerations at the surface from EQL analyses are greater than those of the NL method because the latter generates a higher amount of nonlinearity. The results from the NL approach also illustrate that the deamplification phenomenon occurs in the soft soils of the Hanoi region (e.g., soil profile P3 and P5 of site class D). Additionally, the shear strains calculated from the NL method are closely matched with those from the EQL method, the difference between them increasing with a decrease in soil stiffness.
Highlights
The study of earthquake ground motions and associated earthquake risks plays an important role in the sustainable development of earthquake-prone countries
The purpose of this study is to perform site-specific nonlinear (NL) and equivalent linear (EQL) response analyses based on the profiles from different locations of Central Hanoi City (Vietnam), using a range of input ground motions
The maximum shear strain of soil profiles calculated in this study is less than 0.5%, profile P6 which reaches up to 1% and 2.5% for the NL and EQL approaches, respectively
Summary
The study of earthquake ground motions and associated earthquake risks plays an important role in the sustainable development of earthquake-prone countries. Site response analyses are usually performed to analyze ground amplification and to develop the design response spectra [1]. The northern part of Vietnam is located in the plate boundary between the South China plate and the Indochina plate. The plate boundary is the Red River fault zone that strikes in the NW–SE direction and extends over a length of 1000 km between the Gulf of Tonkin and Tibet [2] It caused large scale displacement and major tectonic features in Vietnam, such as rifting and folding.
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.
