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Evaluation of Hazard-Resistant Pipelines: Thermoplastic Pipe with Couplings

Sept. 27, 2019

The first in a series of testing programs at CU Boulder CIEST investigating performance of critical lifeline systems under extreme loading conditions. This study focuses on the response of various thermoplastic pipe materials and a coupling connection under externally applied axial and lateral loading. Internally pressurized, 6-in. (150-mm) diameter specimens were tested to failure under various loading scenarios including axial tension, compression, and cyclic loading as well as transverse 4-pt bending. This project initiated the development of self-reacting test frame capable of applying dynamic tension and/or compressive loading in excess of 100,000 lbs to linear structures up to 12 ft long. CIEST’s 1,000,000 lb four-post load frame was employed to apply lateral loading.

Building

Liquefaction of Silty Sands

Feb. 18, 2019

Silty-sand is an extremely complex material. Made up of sand and fine-grained, non-plastic or plastic, granular mediums, it has been shown through element testing that even static prediction of the anticipated strengths and behaviors is challenging. The limited, available literature on the behavior of this material during dynamic events is contradictory, and has presented no useful conclusions on how to account for this material. Utilizing my experience with this material gained during my PhD, I intend to focus on how we can use silty-sands in the centrifuge to produce accountable results to predict the influence of this material on liquefaction; hopefully leading to incorporation into performance-based design.

EERI Students Standing by Shake Table

CU EERI Seismic Design Competition 2019

Aug. 29, 2019

The CU Earthquake Engineering Research Institute (EERI) Seismic Design Team competed in Vancouver for 2019 competition.

Canoe Racing

Rocky Mountain 2019 ASCE Conference

Aug. 29, 2019

American Society of Civil Engineers hosts the Rocky Mountain Regional Conference with help from CIEST.

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Seismic Evaluation of HSS Column Splices under Combined Loading

June 28, 2019

Project included development of a bi-directional loading system to apply simultaneous axial and lateral loading to 6 in. diameter columns and splice connections. Nearly 60 full-scale tests were conducted to support evaluation of a new structural building system for seismic applications. Accredited testing performed to ISO/IEC 17025 standard following protocols provided by FEMA 461.

Students working

Concrete Mixing and Testing

CIEST served as a resource to students in AREN 4830 (Sustainable Materials and Structures) as they designed and tested concrete mixes and considered the variable environmental impacts of their chosen materials.

Prep

Structural Testing of Steel Deck Diaphragm Assemblies

Structural assessment of cold-formed steel diaphragm assemblies was conducted in accordance with AISI S907. The cantilever-style tests were performed on 12 x 12 ft square specimens and included both static and cyclic test protocols. Displacements exceeding ± 5 in. were applied to capture peak and residual strength of the joist/deck/fastener assembly, providing data relevant to system evaluation for seismically active regions.

Materials previously weighed in the laboratory and ready for the elaboration of four concrete formulations

Incorporation of Metal-Laden Granular Activated Carbon in Concrete Formulations

The principal objective of this project is to translate the already successful obtained laboratory results to a practice in an industrial trial jointly with Forterra, which is an international company that is dedicated to the fabrication of concrete sewer pipelines and manholes.

Juan Carlos Tiznado Aitken

Seismic Response with Compacted Granular Columns

The main goal of this project is to investigate how the use of compacted granular columns (CGC) may help improve the seismic performance of embankments on potentially liquefiable soils.

Camera image from inside centrifuge, looking out at Hiral Gandhi

Sandia Senior Design Test

March 19, 2018

The Sandia Senior Design Team were tasked to design a switch that activates at 9g, as part of a cubesat subsystem for their senior design project.

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