Long-Term Performance of Aging Structures

Bridges and buildings, dams and nuclear plants – all face growing risks to structural integrity as they age. They also share a common solution: advanced analyses from ANATECH, a Structural Integrity Associates company.

We have provided exceptional engineering solutions and advanced analyses to accurately determine structural risks and reliability. We understand that informed run/repair/replacement decisions begin with an accurate prediction of structural performance – and that's exactly what we deliver. Our state-of-the art solutions provide a realistic view of cost-versus-risk to help owners determine the need for and timing of structural or component replacement. Our assessment expertise, combined with an in-depth understanding of large complex structures, uniquely qualifies us to perform a broad spectrum of assignments.

Probabilistic-based methods are often used to evaluate structural reliability since variations can occur in the loading, material behavior, and composite structural performance over time. The goal of these methods is to establish the probability that a structural condition could develop and then evaluate the risk relative to the cost of preventing that condition.

We are a leader in accurately predicting long-term performance of aging structures. We have in-depth experience in the following areas:

Fatigue Cracking at Welded Connections: Our company performs analyses to determine the fatigue cracking performance of welded connections in hydraulic steel structures. These analyses use global modeling to determine the cyclic demands on the welded joint, local modeling to establish the residual stress distributions due to welding, and then evaluate the fatigue growth of cracks under cyclic loading. Our methodology has been incorporated into U. S. Army Corp of Engineers Guidance for ETL 1110-2-556, "Advanced Reliability Analysis of Fatigue Cracking in Horizontally Framed Miter Gates."

Aging and Degradation of Concrete and Steel Structures: With considerable experience in assessing the long-term structural performance of aging concrete structures, we are able to evaluate the causes and solutions for structures suffering from degradation due to Alkaline Aggregate Interaction (AAR), as well as excessive cracking and deterioration due to thermal cycling and freeze-thaw cycles.

Structural Risk and Life Cycle Management: We provide engineering and analytical support for assessing structural risk and for life cycle management. This work generally involves assessments and cost analyses to help owners discern the optimal timing for replacement of structures or components, in light of costs and risks.

Probabilistic Assessments: For systems with variable or uncertain characteristics, we uses probabilistic-based structural assessments to determine structural risks and reliability. Examples include structural risk from internal cracking in dam monoliths as a function of pool elevations and seismic hazard, structural reliability for fatigue cracking, and durability of aging concrete monoliths exhibiting significant cracking distress.

We are a leader in providing advanced engineering solutions for real-world applications, and our experience includes a diverse range of projects. We frequently provide structural engineering support for civil infrastructure applications, such as bridges, locks, and dams. We are also especially active in applications related to the nuclear power industry.