Abstracts – Browse Results
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Al-Humaidi, H M (2007) A fuzzy logic approach to model delays in construction projects, Unpublished PhD Thesis, , Ohio State University.
Al-Kaabi, N S (2006) A fuzzy-based construction safety advisor (CSA) for construction safety in the United Arab Emirates, Unpublished PhD Thesis, , The Ohio State University.
Bu-Qammaz, A S A S (2015) Risk management model for international public construction joint venture projects in Kuwait, Unpublished PhD Thesis, , Ohio State University.
El-khawas, I N (1997) The optimal design of buildings: A life-cycle approach to energy efficiency, Unpublished PhD Thesis, , The Ohio State University.
Ellis, R A (1980) An analysis of the impact of public participation activities in water and transportation projects, Unpublished PhD Thesis, , Ohio State University.
Fereshtehnejad, S (2018) Multi-hazard lifecycle methods for aging structures and infrastructure systems, Unpublished PhD Thesis, , Ohio State University.
Garrett, C C (1991) Roadway infrastructure management and investment behavior studies for developing countries: A multicriteria approach to road improvement decision-making, Unpublished PhD Thesis, , The Ohio State University.
Godby, C J (2002) A computational study of lexicalized noun phrases in English, Unpublished PhD Thesis, , The Ohio State University.
Halfawy, M M R (1998) A multi-agent collaborative framework for concurrent design of constructed facilities, Unpublished PhD Thesis, , The Ohio State University.
Hauenstein, A D (1966) Construction: A taxonomy and syllabus of production practices with implications for industrial arts, Unpublished PhD Thesis, , The Ohio State University.
Jin, R (2013) A statistical modeling approach to studying the effects of alternative and waste materials on green concrete properties, Unpublished PhD Thesis, , Ohio State University.
Mahmood, N A (2021) Real-time site safety risk assessment and intervention for on-foot building construction workers using RFID-based multi-sensor intelligent system, Unpublished PhD Thesis, , The Ohio State University.
Pan, N-F S (2001) Fuzzy reasoning expert scheduling system (FRESS) for highway construction subject to rain impact: A case study in Taiwan, Unpublished PhD Thesis, , Ohio State University.
Sadoun, B I (1992) A modeling methodology for energy-conserving site design, Unpublished PhD Thesis, , The Ohio State University.
Sarma, K C (2001) Fuzzy discrete multicriteria cost optimization of steel structures using genetic algorithm, Unpublished PhD Thesis, , The Ohio State University.
Sirca, G F (2019) Analysis of full-scale in-service civil engineering structures, Unpublished PhD Thesis, , The Ohio State University.
- Type: Thesis
- Keywords: optimization; concrete structures; formwork; civil engineering; cost optimization; monitoring; programming; bridge; neural network
- ISBN/ISSN:
- URL: https://www.proquest.com/docview/2316520657
- Abstract:
This dissertation focuses on the analysis of full-scale in-service civil engineering structures such as bridges and dams. Four aspects of these types of structures are considered: suspension bridges, prestressed concrete bridges, concrete dams, and soil-filled sheet pile dams. The structures are evaluated using a Wavelet Neural Network (WNN) model for system identification, a neural dynamics model for cost optimization, an Infrared Thermography (IRT) model to detect near-surface defects in concrete, and a permeation grout test method to determine groutability of soils subject to surcharge loading. A new WNN model was developed for system identification of suspension bridge structures and its use in health monitoring systems for damage detection and applied to an in-service bridge structure. The model was formed by combining wavelet decomposition with neural networks by replacing the traditional sigmoid function with a wavelet function, to take advantage of their universal approximation property. A method is presented for the total cost optimization of large prestressed concrete structures, by taking into account the costs of the prestressed concrete, deck concrete, prestressed I-beam steel, deck reinforcing steel, and formwork. The problem is formulated as a mixed integer-discrete nonlinear programming problem. and solved using a robust neural dynamics model. An example is presented to demonstrate the practical application of the methodology presented. Typical network convergence curves using three different network starting points demonstrate the excellent convergence and the robustness of the optimization model. A new IRT method was developed to detect near-surface defects in large in-service concrete structures and was successful in detecting the defects. Although it is possible for a trained eye to examine an IRT image and find the defects in the image, the new method is significantly faster and more accurate. The method was able to detect all the known defects from time-lapsed images by taking advantage of the concrete emissivity where defective concrete temperatures change at different rates than non-defective concrete. An innovative permeation grout test is developed for determining groutability of soils under surcharge load where a soil sample is placed in a rigid container, a surcharge is placed on the soil, and pressurized grout is injected into the soil. After the grout has cured and the surcharge removed, the diameter of the grout column is measured and recorded. Then the test results are evaluated to determine whether the soil is groutable or not. The procedure is repeated at various surcharge loads and grout pressures to establish a relationship between grout pressure and permeation for a given soil overburden. The soils used in the test apparatus during the initial development of the test procedure are those with known and somewhat uniform grain size in order to validate the procedure. Once validated, the test apparatus may be used on soils obtained from the field.
Stanbury, J A C (1992) An exploratory empirical study of the international consulting engineering design services industry: A United States perspective, Unpublished PhD Thesis, , Ohio State University.
Tseng, C-H (2006) Safety performance analyzer for constructed environments (SPACE), Unpublished PhD Thesis, , The Ohio State University.
Vargas, C A (1998) Investigating construction falls using fault tree analysis and developing a prototype tool to reduce falls using expert system and computer-assisted instruction methods, Unpublished PhD Thesis, , The Ohio State University.
Wee, S (1993) A prototype of an expert system for pavement maintenance and rehabilitation strategy in the state of Ohio (espresso), Unpublished PhD Thesis, , The Ohio State University.
Yang, F (2022) Ascending the pagoda: A ground-up exploration of the ancient construction methods of dayanta using virtual reality, Unpublished PhD Thesis, , The Ohio State University.
Yoo, W S (2007) An information-based decision making framework for evaluating and forecasting a project cost and completion date, Unpublished PhD Thesis, , Ohio State University.
Young, D R (1968) The development of a construction industry interest inventory, Unpublished PhD Thesis, , The Ohio State University.
Yu, B (2007) Essays on structural analysis of procurement auctions, Unpublished PhD Thesis, , The Ohio State University.