Structures Subjected to Repeated Loading: Stability and Strength

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The strength and ductility of structures primarily depend on proper detailing of reinforcement in beam-column joints. Under seismic excitations, beam-column joint region is subjected to high horizontal and vertical forces whose magnitude is much higher than those within the adjacent beams and columns.

Fatigue & Material Properties

Beam-column joints have been recognized as critical element in seismic design of reinforced concrete RC frames. Conventional concrete loses its strength after formation of multiple cracks. Present study is aimed at investigating structural behaviour of beam-column joints using normal strength concrete NSC and HPFRC based beam-column joints utilizing steel fibers in varied aspect ratios, types and fiber contents.

Beam-column joint of a multistoried building has been modeled to scale. Seventeen specimens of exterior beam-column joint were cast and tested using HPFRC in different fiber contents to study load-deformation behaviour, failure pattern, stiffness degradation and ductility associated parameters. The typical results illustrate significant increase in compressive, tensile and flexural strength values in HPFRC based control specimens. Beam-column joints corresponding to fiber content of 9 percent with aspect ratio 80 in crimped shape has been observed to give maximum load carrying capacity, energy absorption capacity and resilience.

An optimum fiber contents corresponding to this value may therefore be utilized to provide significant dimensional stability, integrity, strength and ductility to beam- column joints subjected to cycle loading and can be substituted for conventional transverse reinforcement thereby allowing for relaxation in ties and stirrups in beam column joints. At the same time, detailing of reinforcement in beam-column joints affects the strength and ductility of structures.

SA02: Structural Analysis: Stability

It has been identified that insufficient seismic performance in the reinforced concrete RC structures built with low strength concrete or insufficient reinforcement and improper reinforcement detailing, resulting in non-ductile performance of moment resisting frames, lead to brittle failure of the members in a devastating manner.

These types of local failures can cause global failure of mechanism required in seismic upgrading of deficient structures.

Inflow Parameter Effects on Wind Turbine Tower Cyclic Loading on JSTOR

Interaction diagrams for design of concrete-filled tubular columns under fire Ductility of simple steel connections in fire Methodology for reliability-based design of steel members exposed to fire Capacity reduction and fire load factors for steel columns exposed to fire Stability of steel columns subjected to fire Fire behavior of concrete-filled steel circular hollow section columns with massive steel core Buckling of concrete filled steel hollow columns in case of fire Buckling of steel and composite steel and concrete columns in case of fire A coupled fluid-thermal-mechanical analysis of composite structures under fire conditions Behaviour of composite floor beam with web openings at high temperatures To shear resistance of castellated beam exposed to fire Numerical analysis of steel columns considering the walls on fire condition On the strength and DSM design of cold-formed steel columns failing distortionally under fire conditions.

The interaction behaviour of steel plated structures under transverse loading, bending moment and shear force Hybrid steel plate girders subjected to patch loading Numerical and experimental research in tapered steel plate girders subjected to shear Shear strength of steel plates with reinforced opening Crack initiation under static loads including the influence of residiual welding stresses The fatigue and serviceability limit states of the webs of steel girders subjected to repeated loading Imperfections in steel plated structures and their impact on ultimate strength Imperfection sensitivity analysis of longitudinally stiffened plated girders subjected to bending-shear interaction.

Influence of geometry on the dynamic buckling and bifurcations of cylindrical shells Buckling of a shallow rectangular bimetallic shell subjected to outer loads and temperature A geometry based method for the stability analysis of plates Critical loads and stability of an open elastic-plastic cylindrical shell with the core of variable stiffness. Stability bracing requirements of trusses Theoretical and experimental analysis of steel space-truss with stamped connection Real scale experimental analyses of circular hollow section multi-planar steel trusses Natural period of steel chimneys.

Authors assume the elastic-plastic flexural buckling in one plane without lateral torsional buckling behavior of members.


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Design formulae for Methods 1 and 2 for members are analyzed. Structures stiffness constrains are also incorporated in order to satisfy the limit serviceability state requirements.

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With the help of mathematical programming theory and extreme principles the structure optimization algorithm is developed and justified with the numerical experiment for the metal plane frames. Opis fizyczny. Liepa, L. Alawdin P. Limit Analysis of Structures under Variable Loads. Minsk: Tekhnoprint; Alawdin P, Bulanov G.

Introduction

Civ Environ Eng Reports. Alawdin P, Liepa L. Optimal shakedown analysis of plane reinforced concrete frames according to Eurocodes. Int J Mech Mater Des.


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December Alawdin P, Muzychkin Y. Limit analysis of structures with destructible elements under impact loadings.

Eng Trans. Mathematical models of optimization problems at shakedown. Mech Res Commun. Optmization of Elastic Plastic Beam Structures.

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Structural integrity and failure

Optimal shakedown design of bar systems: Strength, stiffness and stability constraints. Comput Struct. Method of fictitious system for evaluation of frame shakedown displacements. Optimal shakedown design of frames under stability conditions according to standards.


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  • Cyclic Loading Test of Structural Walls with Small Openings.
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European Convention for Constructional Steelwork;

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