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Full-Text Articles in Engineering
Proportioning And Properties Of Ultra-High Performance Concrete Mixtures For Application In Shear Keys Of Precast Concrete Bridges, Zhengqi Li
All Dissertations
Ultra-high performance concrete (UHPC) is defined as a cementitious based composite material with compressive strengths above 150 MPa, pre-and post-cracking tensile strengths above 5 MPa, and enhanced durability. To achieve desired properties, UHPC is typically produced with low water-cementitious materials (w/cm) ratio (i.e. w/cm < 0.25), high cementitious materials content (i.e. >1000 kg/m3), high quality aggregate, high dosage of high-range water reducing admixture (HRWRA) and reinforcing fibers. UHPC has distinct advantages in applications where narrow formwork and dense reinforcement are inevitable, high compressive strength concrete material is required and the surrounding environment is aggressive. The construction of shear keys in precast bridges is one of the important …
Reliability Of Bridge Superstructures In Wisconsin, Azam Nabizadehdarabi
Reliability Of Bridge Superstructures In Wisconsin, Azam Nabizadehdarabi
Theses and Dissertations
ABSTRACT
RELIABILITY OF BRIDGE SUPERSTRUCTURES IN WISCONSIN
by
Azam Nabizadehdarabi
The University of Wisconsin-Milwaukee, 2015
Under the Supervision of Professor Habib Tabatabai
Bridge reliability analyses form the basis of modern bridge design provisions. Such analyses are also used to evaluate bridge condition and assess future maintenance needs. The majority of these reliability assessments are based on evaluating risks associated with the various load effects exceeding their corresponding resistance. However, bridge components such as decks and superstructures typically do not reach the end of their service lives by exceeding the strength limit states (structural failure). Survival analyses, which are commonly used …
State Of Accelerated Bridge Construction (Abc) In The United States, Mike Ofili
State Of Accelerated Bridge Construction (Abc) In The United States, Mike Ofili
Honors College Theses
The purpose of this project is to develop a toolkit for the design and construction of bridges using prefabricated materials primarily to reduce the closure time and on-site construction time of newly constructed bridges or bridges undergoing renovation. The research focuses specifically on short span bridges in Georgia (40,60,80, and 120ft spans).
Areas of primary concern for this project were design, constructability, structural analysis, the use of concrete and steel girders, cost efficiency, and industry surveys. In this particular portion of the study, the surveys proved to be most effective when combined with information obtained existing research as well as …