A5060458559- Structural Response to Dynamic Loads
- Fire effects on concrete materials
- High-Velocity Impact and Material Behavior
- Vibration and Dynamic Analysis
- Concrete Corrosion and Durability
- Structural Behavior of Reinforced Concrete
- Structural Load-Bearing Analysis
- Structural Analysis and Optimization
- Cellular and Composite Structures
- Structural Engineering and Vibration Analysis
- Structural Integrity and Reliability Analysis
- Infrastructure Maintenance and Monitoring
- Innovations in Concrete and Construction Materials
- 3D Surveying and Cultural Heritage
- Facial Trauma and Fracture Management
- Corrosion Behavior and Inhibition
- Structural Health Monitoring Techniques
- Structural Analysis of Composite Materials
- Additive Manufacturing Materials and Processes
- Orthopedic Surgery and Rehabilitation
- Infrastructure Resilience and Vulnerability Analysis
- Probabilistic and Robust Engineering Design
- Seismic Performance and Analysis
- Dynamics and Control of Mechanical Systems
- Advanced Materials and Mechanics
University of Massachusetts Amherst
2016-2024
Stahl-Zentrum (Germany)
2016
Schweißtechnische Lehr- und Versuchsanstalt
2016
Columbia University
2011-2015
Aristotle University of Thessaloniki
2010-2011
This paper investigates issues that have arisen in recent efforts to revise long-standing knockdown factors for elastic shell buckling, which are widely regarded as being overly conservative well-constructed shells. In particular, this focuses on cylindrical shells under axial compression with emphasis the role of local geometric dimple imperfections and use lateral force probes surrogate imperfections. Local global buckling loads identified related two kinds Buckling computed four sets...
AbstractThis paper deals with the progressive collapse analysis of a tall steel frame following removal corner column according to alternate load path approach. Several techniques are considered (eigenvalue, material nonlinearities, and geometric nonlinearities), as well 2D 3D modelling structural system. It is determined that mechanism loss-of-stability-induced one can be identified by combining model an involving both nonlinearities. The reveals after initial column, its two adjacent...
Abstract The axial buckling capacity of a thin cylindrical shell depends on the shape and size imperfections that are present in it. Therefore, prediction shells is difficult, expensive, time consuming, if not impossible, because requires priori knowledge about imperfections. As result, designed conservatively using knockdown factor approach accommodates uncertainties associated with shells; almost all design codes follow this explicitly or implicitly. A novel procedure proposed for accurate...
Recent terrorist attacks on civil engineering infrastructure around the world have initiated extensive research progressive collapse analysis of multistory buildings subjected to blast loading. The widely accepted alternate load path method is a threat-independent that able assess response structure in case extreme hazard loads, without consideration actual loads occurring. Such simplification offers great advantages, but at same time fails incorporate role wider damaged area into modes...
In order to assess the robustness of a building structure progressive collapse, removal structural key component is utilized. For steel moment-resisting frame under column-removal scenario, two most prominent collapse mechanisms are yielding type (beam plastification) and stability (column buckling) mode. This paper presents an analytical method that can predict mechanism 2D any scenario estimate load location buckled column in case loss stability. The uses only linear elastic analyses...
Geometric imperfections are understood to play an essential part in the buckling of a thin shell, but how multiple defects interact control onset failure remains unclear. Here, we examine real cylindrical shells by experimentally poking soda cans with large imparted dimple. By high-speed imaging can’s surface, initiation from axial loading is directly observed, revealing that larger dimples tend set initial location. However, influence shell’s background geometric can still occasionally...
An assessment of the elastic-plastic buckling limit state for multi-strake wind turbine support towers poses a particular challenge modern finite element analyst, who must competently navigate numerous modelling choices related to tug-of-war between meshing and computational cost, use solvers that are robust highly nonlinear behaviour, potential multiple near-simultaneously critical failure locations, complex issue imperfection sensitivity finally interpretation data into safe economic...
Abstract Departures of the geometry middle surface a thin shell from perfect shape have long been regarded as most deleterious imperfections responsible for reducing shell’s buckling capacity. Here, systematic simulations are conducted both spherical and cylindrical metal shells whereby, in first step, dimple-shaped dents created by indenting into plastic range. Then, second dented is analyzed, under external pressure axial compression shells. Three distinct analyses carried out: (1) elastic...
Abstract Auxetic architected materials present a novel class of damage-tolerant with tunable mechanical characteristics and high energy absorption due to their unique ability laterally contract densify when subjected axial compressive loading. The current state research on negative Poisson’s ratio mainly focuses 2D geometries few families 3D limited experimental comparisons between different architectures various geometrical features. Furthermore, manufactured via laser powder bed fusion,...