Updating History
A beloved 1921 Parker truss bridge in Healdsburg, California, underwent an extensive rehabilitation and seismic retrofit so that the community could continue to use the historic crossing....

Robotic Rebar-Tying System Uses Artificial Intelligence
A robotic rebar-tying system that uses artificial intelligence on bridge construction projects has been successfully tested in Pennsylvania....

Pipeline Protection
To improve the seismic reliability of three critical pipelines, California’s Santa Clara Valley Water District installed what is believed to be the first large-diameter earthquake-resistant ductile iron...

Safer in Seattle
Constructed in the early 1900s, the Elliott Bay Seawall, in Seattle, protects the city’s downtown waterfront from the erosive forces of Puget Sound and Elliott Bay. Because of its deteriorating condition...

State of the Practice for Laboratory Testing of Soft Soils: It's All in the Details
As with all material testing, soils testing has undergone dramatic advances in technology because of computer automation. In the 1970s, laboratories were filled with dial gages, proving rings, mercury...

Avoiding Impacts of Collapsed Mines on Railways: A Multidisciplinary Geophysical Detective Approach
The presence of abandoned mine workings can pose a significant risk to the use and development of surface structures above them, including railway lines. Typically, the adverse and often sudden effects...

Inexpensive, Portable, Nondestructive Equipment Tests Bridge Capacity
A research team at Rutgers University has developed cost-effective, portable, nondestructive equipment to test bridge capacity....

Guidelines for Construction Vibrations: How Much Rattle is Too Much?
The study of construction/blast-related ground vibrations on structures, people, and objects is a surprisingly diverse field. Vibration sources vary from blasting, all types of construction equipment,...

Claims against Geotechnical Engineers: Getting it Right in the Midst of Uncertainty
Geotechnical engineering is one of engineering's riskiest professions, prone to litigation due to the inherent uncertainty associated with characterizing the subsurface. Site investigations rarely provide...

Seismic Data from Smartphones: MyShake: Building a Global Smartphone Seismic Network
Increasing the density of earthquake-monitoring instruments at a fast rate and at a low cost is a dream for many researchers who study earthquakes. MyShake, a smartphone application developed by the Berkeley...

As I See It: Rethinking the One-Third Increase in Bearing Capacity for Seismic and Wind

Low-Gravity Experiments: Shear Testing Takes a Nose Dive
A major challenge to making celestial soil mechanics viable is to re-engineer the profession's toolkit to provide geotechnical solutions without the luxury of ex-situ and in-situ testing as we know them...

Calibration of Jackup Leg Foundation Model Using Full-Scale Structural Measurements
The fitness of jack-up rigs to operate in varying water depths and weather conditions is determined by "site-specific" structural assessments. These assessments are conducted by a wide range of companies...

Cracking the Nuclear Code: Finding an Alternative to the Nuclear Density Gauge
Two of the most basic quality control tests made in the field during soil construction are the soil’s moisture content and density. The establishment of a uniform procedure to compare the performance of...

You Designed It for the Big One, Right?
Illustrating and Communicating Uncertainty in a Deterministic Seismic Hazard Analysis
In seismic regions of the U.S. and worldwide, engineers design structures to withstand seismic ground motions resulting from a large, rare earthquake. But definitions of "large" and "rare" depend on who...

Performance-Based Earthquake Engineering
What Can It Do for You?
There's been a lot of talk, and some confusion, lately about performance-based earthquake engineering (PBEE). Many geotechnical engineers wonder -- what is it, how does it differ from what I've been doing,...

Permeable Pavement Research Needs
The implementation of permeable pavement installations and practices are expanding and becoming more commonplace. With this increased usage comes expanded and improved information on design,...

General
Design of Latticed Steel Transmission Structures specifies requirements for the design, fabrication, and testing of members and connections for electrical transmission structures. These...

Pipe Design
The pipes and joints, once installed, must be capable of safely withstanding, for the project design life, all in-use service loads, including those associated with the following factors:...

Evaluating Bridges With Unknown Foundations for Susceptibility to Scour: North Carolina Applies Risk-Based Guidelines to Over 3,750 Bridges
Scour occurs when flowing water removes erodible material such as sand and rock. For bridges over water, scour affects the stability of pier and abutment foundations and contributes to...

 

 

 

 

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