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Research


Seismic Response of Moment Resisting Frames when Coupled with a Rocking Wall

In view of the appreciable seismic damage and several weak-story failures (some at mid-height) of multistory buildings that have been documented after major earthquakes, there has been a growing effort to develop an alternative hybrid structural system by coupling the response of moment resisting frames with rigid/stiff  walls which are allowed to uplift and rock during ground shaking; therefore, enforcing a uniform drift distribution.

High-Fidelity Finite Element Analysis using Substructuring Techniques

Over time, an increase in computational power has enabled modeling and analysis of finite element models (FEMs) with greater detail. However, even with the high-performance computers, the analysis of high-fidelity FEMs is still computationally expensive. Hence, the use of high-fidelity FEMs, especially for model updating purposes, can be cumbersome. To overcome these challenges, notably if the dynamic characteristics like eigenvalues, eigenmodes, and frequency-responses are the outputs of interest, component mode synthesis (CMS) methods are employed.

Bridge Piers that are Free to Rock and Rotate above their Foundation

The concept of allowing a tall, slender structure to uplift and rock was first advanced and implemented in modern civil engineering in the late 1960s in New Zealand with the design and construction of the stepping piers of the South Rangitikei Rail Bridge. Despite its remarkable design and its half-century-long outstanding seismic performance, the stepping design of the South Rangitikei Rail Bridge has not received the attention it deserves because even at present the design of nearly all tall valley bridges remains entrenched in capacity design, leading to disproportionally large and expensive pile or caisson foundations.

Student Research

If you are interested in research please feel free to email me or stop by my office.

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