Now showing 1 - 3 of 3
  • Publication
    Challenges and solutions to model-scale testing for composite deep foundations and existing foundation enhancement
    (American Society of Civil Engineering (ASCE), 2007) ; ; ;
    Laboratory testing for foundation design offers advantages over field-testing, especially, where existing installations preclude easy accessibility. Advantages include a homogeneous soil, ability to place instrumentation throughout the soil mass, and capacity to bring the system to failure, as well as control over the failure mechanism. Repeatability is also achievable. Laboratory work, however, has its own challenges. For model-scale work, a main impediment is scaling: strength, dimensions, and boundary conditions hinder accurate modeling of the soil and brings a difficulty in representing scaled foundations. This paper describes the construction-oriented solutions pioneered for meeting the geometric requirements of ⅛th scaled laboratory testing of composite deep foundations for existing foundation enhancement, including drilled shafts, helical piers, and grouting. Results of the testing program are included as verification of the usefulness of the techniques.
      2230Scopus© Citations 2
  • Publication
    Small-scale testing of rehabilitated pile groups
    The grouted, helical pier system (GHPS) is proposed as an example of a capacity improvement option for existing pile foundation groups. This paper explores the relative relationships between these geotechnical elements through the implementation of small-scale ground modification techniques causing increases in the axial capacity of the foundation, as measured as a function of load-based deflection. This initial set of tests indicates clear improvement of both piled and non-piled foundations through a variety of intervention methods both in terms of overall capacity and with respect to generating that capacity with smaller mobilization levels. The testing program also showed the likelihood for using some form of superposition as viable design methodology for predicting the performance of existing cast-in-place foundations that have been upgraded with ground-reinforcement and ground-improvement techniques.
  • Publication
    Building reuse assessment for sustainable urban reconstruction
    (American Society of Civil Engineering (ASCE), 2008-03) ;
    Building reuse is a linchpin to managing solid waste. Despite the various benefits beyond contributing to sustainability that can be realized through building reuse, including direct and indirect cost savings, truncated construction schedules, and reduced site disruptions, little formal consideration has been given to this topic, which places professional engineers at a disadvantage, when considering this as a design option. As each building project has its own specific requirements, reuse is not always the most economical solution, however, in cases where reuse is in part motivated by other factors such as heritage protection, substantial economic and environmental savings can be realized in tandem. Based on nearly two decades of professional experience, a generalized assessment method for reuse is proposed to facilitate benefit maximization. Applying this 10 step method, the costs related to building replacement and sustainable reuse are compared using two case histories and a theoretical building resulting. A clear correlation is shown as to the potential for savings as a function of project size.
      4320Scopus© Citations 48