(Betti, Deodatis, Ling, Smyth, Sun)
Analysis and design of a large range of structures, including buildings and bridges subjected to seismic loading. Active, passive, and hybrid control of structures. Seismic risk analysis and loss estimation of structural systems and lifelines. Geographical information systems. Geotechnical earthquake engineering, soil liquefaction.
Urban storm water and waste management. Modeling of hydraulic and pollutant transport. Analysis and design of watershed flows including reservoir simulation. Estuaries and flushing analysis of coastal embayments. Unsaturated zone hydrology. Geo-environmental containment systems and site remediation. Water and waste management for developing communities. Applications of Geographic Information Systems (GIS).
(Betti, Fish, Smyth, Waisman)
Reliability and fatigue of aging aircraft. Mechanics and thermal science of composite materials, thin films, and coating for aircraft and aerospace applications. Active vibration control. Multifunctional materials for unmanned air vehicles.
Development and application of decision support systems for infrastructure asset management. Strategic indicators of infrastructure performance and service. Economically sustainable strategies for provision of civil infrastructure systems and services. Portfolio approaches to infrastructure development, operation, and management. Procurement processes and project delivery systems. Risk allocation and management of integrated facility delivery and system-wide operation and maintenance contracts.
(Fish, Waisman, Yin)
Development of modern building materials that are environmentally friendly and compatible with sustainable development. Use of recycled materials such as waste glass and carpet fibers in concrete. Beneficial use of highly contaminated dredged material and waste incinerator ash. Architectural concrete and gypsum products. Efficient material handling and production technologies. Fiber-reinforced cement slurries for oil-well construction.
Research opportunities in risk assessment and risk management of the civil infrastructure subjected to natural and man-made hazards including earthquakes, floods, wind and blasts. Infrastructure components include buildings, bridges, aboveground and underground transportation facilities, lifelines, etc.
Research opportunities in computational stochastic mechanics, stochastic finite element methods, simulation of stochastic processes and fields, linear and nonlinear stochastic dynamics.
Mathematical modeling of the constitutive behavior of cementitious materials, including fiber-reinforced cement composites. Damage mechanics and low-cycle fatigue behavior. Response of reinforced concrete members to strong cyclic loads.
(Dasgupta, Fish, Waisman, Yin, Sun)
Nonlinear elasticity; constitutive modeling of solids at large strains, numerical analysis of static and wave propagation problems. Viscoelasticity and plasticity; nonlinear creep, non-isothermic dynamic visco-plasticity; constitutive equations for geomaterials. Mechanical properties of coated fabrics. Failure criteria for composite materials. Fracture mechanics; fracture under dynamic loading, large strain effects in fracture of elastic solids. Continuum damage mechanics.
Structural Control and Health Monitoring
Today, buildings and bridges are built capable of monitoring their condition, diagnosing weaknesses and providing, if needed, corrective actions for performance improvement and/or prognosis for maintenance planning and resource allocation. These emerging areas are becoming more and more popular in civil engineering structures thanks to powerful computational resources and advances in inexpensive sensing, often employing multi-tiered wireless networks. In the department, today, research is conducted on identification of linear and nonlinear dynamical systems, with particular emphasis on development of techniques for damage detection. By using information about the structure's response to known and unknown input, it is possible to derive sophisticated models of the structures that allow to pinpoint locations where possible damage has occurred. For this task, it is important to have a reliable model of the structure and researchers in this department have been conducting extensive studies on the development of algorithms for the identification of linear and nonlinear structural models. Among the recent projects, the identification of the Verrazano-Narrows Bridge (New York) and of the new Carquinez Bridge (California). Still in the area of suspension bridges, researchers in this department are involved in a major research project on the monitoring of the corrosion in the main cable of suspension bridges: this project, sponsored by the Federal Highway Administration, has the goal of developing an innovative multi-sensor system that will be embedded in a main cable of suspension bridges and provide an online estimate of the remaining cable strength.
(Betti, Deodatis, Dasgupta, Fish, Ling, Smyth, Waisman, Yin)
Dynamic fluid-structure interaction; acoustic scattering and radiation from submerged shells, use of alternate surface expansion functions. Dynamics of fluid-filled shells. Behavior of structures under wind loading. Ocean structures subjected to wind-induced waves. Dynamic response of inelastic structures at large deformations. Nonlinear dynamic finite element analysis. Nonlinear vibrations and chaos: stability bifurcations, effects of tensile failure under periodic loading. Active, passive and hybrid control of structures under dynamic loading in the time and frequency domain. Floor design for vibration control by passive and active damping systems.