31 May 2024

Hydraulic Load Definitions for Use in Load and Resistance Factor Design (LRFD) Analysis, Including Probabilistic Load Characterization, of 10 Hydraulic Steel Structures: Report Number 1

Abstract: In the past, allowable stress design (ASD) was used to design steel structures. The allowable stresses used were determined from previous practice, with limited understanding of the reliability and risk performance provided by the structure. Engineering methods based on Load and Resistance Factor Design (LRFD) provide more accurate lifetime models of structures by providing risk-based load factors. Besides improved safety, cost savings can be provided through improved performance and, in some cases, by delaying rehabilitation. This research project develops LRFD-based engineering procedures for the evaluation and design of hydraulic steel structures (HSS). Hydraulic loads are a key element to the LRFD analysis. This report identifies the primary hydraulic loads and describes procedures that can be used to determine these hydraulic loads. Existing design guidance for HSS is described and presented in the individual chapters. The appendixes to the report provide examples of the procedures used to compute the hydrostatic, wave, and hydrodynamic loads. A new approach for determining wind-induced wave loads was developed. Design guidance for computing the hydrodynamic load was limited for many of the HSS. Additional research is recommended to improve capabilities for computing hydraulic loads. Details on these recommendations can be found in this report.

8 Sep 2022

Teamwork protects land, “helps ensure Mississippi River does not try to change course”

The Memphis District's Revetment Branch and Metals Units recently finalized a flapgate repair on what’s called the “Fritz Landing Culvert” in Lake County, Tennessee, in August 2022. Their hard work and collaboration will undoubtedly result in the extended protection of almost 7 thousand acres of land. Additionally, this project will contribute to decreasing the Mississippi River’s meandering ways, and thus safeguard many surrounding localities for many, many years to come.

16 Jun 2022

Unique ERDC facility allows researchers the opportunity for large-scale structural testing

There are many ways to test the load-bearing capability of structures, and fortunately, the U.S. Army Engineer Research and Development Center (ERDC) has a unique facility to accomplish this task.

18 Nov 2020

High water levels and wave events increase safety hazards

The U.S. Army Corps of Engineers urges caution around Great Lake piers, breakwaters and jetties, particularly during times of high wind and wave events. Many accidents and incidents near harbor structures occur during the turbulent weather season late in the year and higher than normal water levels pose an added threat. The lakeshore attracts local residents and visitors alike and some may not be aware of the powerful impacts that strong winds, storms and high water levels can bring. Dangers of High Water Levels, Waves. The Great Lakes are experiencing higher than normal water levels, which bring safety hazards such as submerged breakwaters, dangerous rip currents and electric shock risks.