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...

Access Granted
In southeastern Pennsylvania, CSX Transportation sought to increase the productivity of its Trenton Line freight rail service by improving the vertical clearance of its tracks so that it could operate...

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...

Design of the Future Mexico City Airport: Attaining Resilience in Soft Ground
The Lake Texcoco region to the east of Mexico City is famed for its deep lacustrine deposits of compressible clay, which amplify ground shaking during seismic events. The area is also gradually subsiding...

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...

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...

Detailed Site Investigations
This section addresses site investigation issues that are important for detailed design and construction of microtunneling projects. These site investigations include the following: Geotechnical...

 

 

 

 

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