Browsing by Author "Li, Yuhao"
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- Design Of A Miniature Base Isolation DemoPatil, Saurabh; Baishya, Ronit; Li, Yuhao (2023-05-15)In this project, we will design a miniature base isolation demo. The objective is to design the total mass, stiffness, and damping (mb, kb, cb) of a base isolation system for a single-story building, subject to the design spectrum described below. An effective isolator will result in a maximum moment that is significantly lower than that of the no-isolation case (fixed base). The target reduction in the base moment is shown in Table 1. The challenge is that as you make the isolator more flexible, it will also deform more and could break as well, so we also will place a limit on the maximum allowed deformation.
- Field Inspection of High-Density Polyethylene (HDPE) Storage Tanks Using Infrared Thermography and Ultrasonic MethodsBehravan, Amir; Tran, Thien Q.; Li, Yuhao; Davis, Mitchell; Shaikh, Mohammad Shadab; DeJong, Matthew M.; Hernandez, Alan; Brand, Alexander S. (MDPI, 2023-01-20)High-density polyethylene (HDPE) is widely used for above-ground storage tanks (ASTs). However, there are currently no guidelines for the non-destructive testing (NDT) and evaluation (NDE) of HDPE ASTs. Moreover, the feasibility, limitations, and challenges of using NDT techniques for the field inspection of HDPE ASTs have not been well established. This study used both infrared thermography (IRT) and ultrasonic testing (UT) for the field inspection of HDPE ASTs. Highlighting the implementation challenges in the field, this study determined that: (1) ambient environmental parameters can affect IRT accuracy; (2) there is an ideal time during the day to perform IRT; (3) the heating source and infrared camera orientation can affect IRT accuracy; and (4) with proper measures taken, IRT is a promising method for flaw detection in HDPE ASTs. Additionally, UT can be used following IRT for detailed investigation to quantify the size and depth of defects. The manuscript concludes with a discussion of the limitations and best practices for the implementing of IRT and UT for HDPE AST inspections in the field.