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Showing 1 to 20 of 40 for “"joist"”.
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Vibration characteristics of joist and joist-girder members
… development of lightweight steel beam and steel joist-concrete slab floor systems, floor vibration problems are becoming more and more prevalent. This paper presents the experimental and analytical study of the vibration characteristics of steel joist and joist-girder members. Three aspects were …
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Fundamental frequencies of I-joist, solid-sawn wood joist, and truss floors based on tee-beam modeling
Full size wood joist floors were built and their frequencies were measured. Double tee-beam floors were built and also cut from the full size floors and their frequencies were measured. The floor joists investigated included: solid sawn, parallel chord floor trusses, and composite I -joists. The …
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Fundamental Natural Frequency of Steel Joist Supported Floors
… determining the first natural frequency of steel joist supported floors were studied. The aspects are: 1) determining which finite element model best predict the behavior of joist-slab tee-beams, 2) investigating the ability of proposed equations to calculate the effective moment of inertia of …
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Investigation of Steel Joist Supported Wood Floor Systems
… investigates four aspects associated with steel joist supported wood floor systems: 1) acceptability, 2) prediction of deflection, 3) prediction of frequency, and 4) effects of diagonal bracing. Six full scale floor systems and two two-joist floor systems were constructed in the laboratory. Span …
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Investigation of Ultimate Strength of Composite Open-Web Joist-Girders
… of generating composite action using open-web joist-girders, designed and manufactured by Nucor Corporation. In addition to comparing the relative performance of these systems, it was intended to determine whether the current accepted design procedure for composite joists could be extended to …
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Methods to improve the vibration characteristics of joist supported floor systems
… has generated more efficient designs of steel joist-concrete slab floor systems. Though the structural integrity is rarely compromised, these floor systems are more susceptible to human-induced vibrations which may be annoying to the occupants of the structure. The purpose of this investigation …
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Analytical Evaluations of Buckling Behavior of Wood Composite I-Joist with Sinusoidal Web
… is an important limit state for wood composite I-joist because the in-plane bending stiffness is typically greater than torsional lateral bending stiffness. Web local buckling is another important limit state because of the thin-walled web configuration. To increase the buckling capacities of wood …
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Effects of Bottom Chord Extensions on the Static and Dynamic Performance of Steel Joist Supported Floors
… on deflections and vibration characteristics of joist supported floor systems when joist bottom chord extensions are installed. To understand the effect of bottom chord extensions on deflections, natural frequency, damping, mode shape and effective mass, extensive analytical and experimental …
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Investigation of several aspects of the vibration characteristics of steel member-supported floors
… in resisting a heel-drop impact for steel joist and steel beam-concrete slab floors, 2) the effective moment of inertia of steel joist and joist-girder members, 3) the ability of joist seats to provide composite behavior between the supporting member and overlying slab, and 4) the effects …
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Elastic-plastic finite element modeling of long span composite joists with incomplete interaction
… of seven long span composite open-web steel joists. These analyses account for the incomplete interaction between the concrete slab and the steel joist by modeling the nonlinear behavior of the steel shear connectors. Experimental tests on long span composite open-web steel joists were …
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Strength of welded headed studs in ribbed metal deck on composite joists
Standards for stud strength in composite joists are presently not available. Existing standards for composite design are targeted for composite beam design while design of a composite joist requires more emphasis on stud strength to fully develop the joist bottom chord. Stud placement in the deck …
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Effects of a Flexible Foundation on the Response of a Timber Shear Wall
… relatively flexible foundation, such as a floor joist, which would alter the stiffness, and therefore the response of the wall. Research on flexible foundations is limited at best, and there is a string need to examine the behavior of shear walls on flexible foundations. The study consisted of …
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The effect of stiffness and mass on the dynamic response of wood floors
… the effects of coefficient of variation (COV) of joist modulus of elasticity (MOE), floor mass and stiffness, imposed load, and boundary conditions on the floor vibrational performance. Three main parameters used to describe the vibration are resonant frequency, damping ratio, and root mean square …
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Deflection comparisons of different wooden floor systems
… on floor sections with 2"x4" , 2"x6", and 2"x8" joists at four different stages of construction. Stage A was joist alone; stage B joists plus 1/2" plywood subflooring; stage C, stage B plus 25/32" oak strip flooring laid parallel to the joists; and stage D, stage B plus oak strip flooring laid …
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Longitudinal Slab Splitting in Composite Girders
… splitting in composite hot rolled girders and joist girders was investigated. Two different type of framing configurations were studied with two tests conducted per configuration. The framing configurations were designated as either flush-framed or haunched, which describes the framing of the …
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Ultimate strength analysis of partially composite and fully composite open-web steel joists
The behavior of composite steel joists with various degrees of shear connection is investigated. The results of eight full-size composite joist tests, conducted as a portion of the study, are presented. Joist spans range from 24 ft. to 30 ft. and depths from 8 in. to 18 in. Six types of mechanical …
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Evaluation of long span composite joists
… of longspan composite open-web steel joists are studied. Eight full scale single span composite joists were tested to failure to evaluate their performance in both the elastic and inelastic ranges. The test specimens' spans, depths, slab depth, and amount of shear connection was …
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Reconsidering Composite Action on Strength of Wood Roof Systems
… reconsidering composite action, produced by the joist-sheathing interaction of the assembly, on the bending strength of joists. The effect of composite action can be quantified by considering a composite T-beam, with the wood joist being the web and the structural sheathing being the flange. …
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Finite Element Analysis of Unbraced Structural Wood I-Joists Under Construction Loads
… rotational response of unbraced wood composite I-joists to worker loads. All experimentation and modeling was conducted on simply supported I-joists varying from 11-7/8 inches to 14 inches in depth and 20 feet to 24 feet in length. I-joists were subjected to static and dynamic loads. The …
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Lateral-Torsional Buckling Instability Caused by Individuals Walking on Wood Composite I-Joists
… unfinished structures. Workers walking on wood I-joists on roofs and floors are prone to fall hazards. Wood I-joists have been replacing dimension lumber for many floor systems and a substantial number of roof systems in light-frame construction. Wood I-joists are designed to resist axial stresses …
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