2019 In Review

 

2019 was an eventful year for Richard J. Driscoll, Consulting Engineer (RJDCE). The year saw new practice records for prospective projects, new projects, billings and revenue. In addition, RJDCE observed new milestones and completed new initiatives to propel future growth.

Looking Back to 2019

RJDCE followed a record year in 2018 with another record year in 2019. The number of new projects more than doubled compared to last year, resulting in healthy growth in billing and revenue. Most of this growth occurred in RJDCE’s forensic engineering practice area and included residential and non-residential condition assessments and distress investigations, construction damage claims and the practice’s first expert witness engagements. Even a couple of this year’s design projects either precipitated from forensic investigations or required incidental forensic services.

Continue reading “2019 In Review”

New RJDCE Website

Welcome to the new Richard J. Driscoll, Consulting Engineer (RJDCE) website!

Over the past several months, RJDCE has undertaken a reorganization and modernization of the practice’s website. Improvements to the website have included new content, improvements to navigation and a modern new theme. The previous website was derived from a personal website when the practice launched in 2015 and was built out over the next couple of years. This is the first major upgrade to the website since it was launched and built out.

Continue reading “New RJDCE Website”

What Contractors Should Know About Retaining Engineers

Construction contractors sometimes need to retain engineers or other design professionals as consultants. They may require engineering support to design temporary works used as part of the means and methods of construction or portions of the project delegated to the contractor by the design professional of record. In addition, contractors may benefit from professional advice to assist with bidding, to solve field problems or to resolve claims.

While the need for contractors to engage consultants is common, the contractors’ personnel may not be experienced clients personally. This can lead to poor consultant selection, inadequate scopes, unmet expectations, sub-optimal risk allocation and a variety of other problems. These problems can be avoided by being better informed of how the services of engineers and other professional consultants differ from more familiar goods and services and how the relationship between professional and client differs from other business relationships. Continue reading “What Contractors Should Know About Retaining Engineers”

How to Delegate Design the Right Way

“Delegated Design” is the means by which the Design Professional of Record (DPOR) passes design responsibility for certain details or elements of a project to the Contractor. It provides flexibility so that proprietary materials and components can be incorporated into the project without the need to complete multiple, detailed design options in the construction contract documents. In addition, delegated design allows the contractor to modify certain aspects of the design to use their preferred means and methods, thus reducing construction costs.

Continue reading “How to Delegate Design the Right Way”

What Everyone Should Know About Earthquakes and Structures

Partially collapsed building. 2008 Wells, NV Earthquake (Utah Geological Survey)

Most people understand that earthquakes can produce catastrophic damage to the built environment. However, given that large earthquakes are relatively rare, and that the television news cameras typically move on a few days after any disaster, a lot of people’s understanding of the effects of earthquakes may be shaped more by bad disaster movies than reality.

This is unfortunate because, as with other natural hazards, there are public policy choices regarding earthquake risk and recovery that would benefit from an informed public. Among these choices are building code requirements for earthquake-resistant construction. While it may violate some people’s idea of “common sense”, earthquake-resistant structural design is required by code to some extent in all jurisdictions in the United States. Another controversy is mandatory seismic retrofit requirements in some west coast cities for non-ductile concrete and “soft-story” wood frame buildings. Since news organizations may have little more scientific literacy than the public they must inform, they may have too simple an understanding of earthquakes and may overstate associated risks. This could result in disaster mitigation resources being spread too thin.

Whether you live in the west, the east or the heartland, you are exposed to some earthquake risk. It is therefore important to know certain things about earthquakes and how structures resist them. Continue reading “What Everyone Should Know About Earthquakes and Structures”

What’s Wrong with Your Monitoring Plan

Construction, particularly in the urban environment, often exposes nearby structures and facilities to hazards. These hazards are difficult to predict precisely and manifest as the work progresses. Impacts of this nature are associated with excavations, tunneling and foundation construction methods. Monitoring of potentially impacted structures and facilities can be necessary to control the risks associated with these construction hazards. A monitoring program may include a variety of means of observation and measurements, including periodic visual and photographic observations of the work and adjacent properties, survey readings and instrumentation to measure displacement, vibrations, groundwater levels and other phenomena.

Commonly used construction monitoring techniques have been available for over 50 years. Technology has reduced the cost and expanded the options for monitoring programs. In spite of this, the full benefit of construction monitoring is often not realized. Here are a few things that can be wrong with the monitoring program for your project: Continue reading “What’s Wrong with Your Monitoring Plan”

Nonlinearity and the Foundation Engineer

One of the challenges of real-world engineering problems is the need to predict the behavior of a system which may be complex, dynamic, nonlinear and subject to uncertainty as to loading and response. Foundation problems are a good example of this. The behavior of a foundation is complex; it is a soil structure interaction problem in which the behavior of the ground and the configuration of the superstructure will influence the results. Foundation behavior may be dynamic, in the sense that the response can be sensitive to initial conditions and the loading history. Loads can also be applied dynamically. However, the complex and dynamic nature of foundation problems is driven by the nonlinear behavior of structures and soil-structure interaction. Continue reading “Nonlinearity and the Foundation Engineer”

When to Use Soil-Structure Interaction for Excavation Support Design

When structural systems are used to retain in-situ soil during excavation, the resulting soil pressures are difficult to accurately predict. In addition to the uncertainty inherent to soil materials, and the inability to fully measure those properties, the pressures on an excavation support system or permanent foundation elements that similarly retain in-situ soil and any existing facilities thereon are indeterminate soil-structure interaction problems. As the structural system is loaded, usually by the excavation of supporting soil, it deforms. Movement of the excavation support mobilizes the internal strength of the soil. For a given load, the deformation stops when equilibrium is reached and the soil and support structure are sharing the task of retaining the soil.

This loading process is non-linear, time-dependent, and is influenced by a number of soil attributes, as well as the configuration and behavior of the excavation support structure, both globally and locally. Consequently, there are many approaches to estimate the soil loads on an excavation support system, all of which are based on simplifying assumptions of the soil-structure interaction. Continue reading “When to Use Soil-Structure Interaction for Excavation Support Design”

The Perils of Seal Renting and Permission Slips

I was once contacted by a marketing official of renewable energy firm looking for help with a small solar array project. His company had a solar installation designed offshore but needed an engineer licensed in the proper jurisdiction to seal the drawings…that afternoon. I balked at the request. I could not possibly perform a sufficient review of the design to represent to the jurisdiction that I was in responsible charge. The marketer insisted that my seal on the plans would just tell the jurisdiction that I would be involved going forward. Sure I would be… Continue reading “The Perils of Seal Renting and Permission Slips”