August 30, 2014

Experimental Basis of CFRP Renewal of PCCP

Abstract: This paper presents the results of the experimental phase of a three year research program sponsored in part by Water Research Foundation (WRF) to form the experimental basis of an American Water Works Association (AWWA) Standard on...

August 30, 2014

Post-Installed Anchors - The Present State of the Industry

By: Neal Anderson, Meinheit, Donald F.

Abstract: Formal concrete anchorage design provisions first appeared in ACI 318-02 as Appendix D, with applications limited to cast-in-place anchors and post-installed mechanical expansion anchors. The codified design provisions represented a...

August 30, 2014

Cure Behavior of Epoxies Used for CFRP Repair of Pipelines

By: Murat Engindeniz, Rasko Ojdrovic, Arnold, Scott, Jimenez, Tomas

Abstract: This paper presents the results of a laboratory testing program on the curing behavior of one impregnating epoxy (Tyfo® S) and one thickened epoxy (Tyfo® WS) that are most commonly used in carbon fiber reinforced polymer (CFRP)...

August 30, 2014

Saving Shoppers Garage - The History of One of Boston’s Early Parking Garages and the Project that Restored It

Abstract: In the early 1920s, parking was becoming a significant problem in city centers. Automobile ownership had increased dramatically in the previous 10 years—from about 469,000 registered cars on the road in 1910 to about 9,241,000 in...

August 30, 2014

To Test or Not To Test...? Glazing, roofing, masonry and air barriers: A guide to field quality control

Abstract: When properly applied, tests can yield valuable insight into the installed performance of systems, aid investigators in determining the cause of a failure, or help to determine if a product is performing to its intended level. However,...

August 30, 2014

Structural Analysis of Deeply Buried Flexible Pipe at Waste Disposal Sites

Abstract: Waste disposal sites require subsurface gravity pipe systems to collect waste leachate and safely convey it to treatment and disposal facilities. As the availability of suitable land for waste disposal sites decreases and the cost to...

July 30, 2014

Multiple Deterioration Mechanisms in Coastal Concrete Piles

By: Brett Holland, Kurtis, Kimberly E., Moser, Robert D., Kahn, Lawrence F., Aguayo, Fred, Singh, Preet M.

Abstract: The article presents a forensic investigation of precast prestressed concrete piles removed from the I-95 Turtle River Bridge, near Brunswick, GA. The piles exhibited extensive damage that led to the discovery of unexpected threats to...

July 30, 2014

How Thin is Too Thin? Evaluating slab thickness in reinforced concrete flat-plate construction

Abstract; Reinforced concrete flat-plate construction is popular among mid- and high-rise residential construction projects. It provides a great deal of flexibility in the placement of the structure’s vertical load-carrying elements (i.e....

July 29, 2014

Estimating effective damping introduced by a Pendulum Tuned Mass Damper using the Extended Kalman Filter

By: Roffel, Aaron J., Narasimhan, Sriram

Abstract: Pendulum tuned mass dampers (PTMDs) are common auxiliary damping devices used to attenuate excessive motion in tall structures. The concept of effective or equivalent damping is commonly referenced when quantifying tuned mass damper (...

July 29, 2014

Lateral Load Behavior of a Post-Tensioned Coupled Core Wall

By: Barbachyn, Steven, Kurama, Yahya C., McGinnis, Michael J., Sause, Richard, Kristen Peterson

Abstract: A 40%-scale multi-story reinforced concrete coupled core wall structure with unbonded post-tensioned coupling beams was recently tested under quasi-static reversed-cyclic lateral loading. This paper provides an overview of the design...