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Showing 1 to 20 of 44 for “"joists"”.
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Standoff Screws Used In Composite Joists
… as a mechanical shear connector in composite joists. Standoff screws are being investigated as an alternative to welded shear studs in short span composite joists. The data and results obtained from 106 pushout tests performed on the Elco Grade 8 standoff screw are presented. The test …
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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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Strength Calculation Model for Standoff Screws in Composite Joists
The objective of the research reported herein is to present a comprehensive evaluation of all available experimental data from push-out tests utilizing the ELCO Grade 8 standoff screws. The goal is to develop a strength prediction equation and determine reliability parameters compatible with the …
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Further Investigation of Standoff Screws Used in Composite Joists
… as a mechanical shear connector in composite joists. Standoff screws are being investigated as viable an alternative to welded shear studs in short span composite joists. The data and results obtained from 59 pushout tests performed on the 5/16 in. diameter Elco Grade 8 standoff screw are …
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Design of Floor Joists Manufactured via Large Scale Additive Manufacturing
… thesis specifically looks at the design of floor joists, the beams under the floor supporting the floor. In trying to build homes for those that lack adequate shelter, the MIT HAUS group has to design to minimize cost. The design of the floor joists seeks to minimize cost by designing a thin …
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Standoff screws functioning as mechanical shear connectors in composite joists
The results of sixty-five double-sided pushout tests utilizing the Elco grade 8, 5/16 in. diameter, standoff screw functioning as a mechanical shear connector are presented. In all tests, the base material, through which the screw was fastened, was fabricated out of back to back angle to simulate …
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A study of semi-rigid connections between longspan joists and columns
… type of semi-rigid connection between longspan joists and columns. It is also an attempt to establish a correct technique for testing full size longspan joists and column connections. Although not commonly utilized in industry, in which longspan joists most frequently are used as …
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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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Evaluation of deck fasteners functioning as shear connectors for composite steel joists
… as shear connectors for composite open web steel joists is studied. Results of thirty-six push-off tests are evaluated in terms of strength and behavior. Six types of deck fasteners are considered. They are: 1. #12-24 Teks/5 self-drilling, self-tapping screws. 2. 1/4-14 Teks/3 with a 1 1/4 in. …
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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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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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Lateral Movement of Unbraced Wood Composite I-Joists Exposed to Dynamic Walking Loads
… walking loads. Three 16 in. deep GPI® 65 I-joists were simply supported and laid parallel to each other, while the bracing was attached to the top flange. Five different brace stiffnesses were used: zero stiffness (control), 1.2 lb/in., 8.5 lb/in., 14.0 lb/in. and infinitely stiff. Two …
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The effects of cutouts in joists on the vibrational response of wood floors
This thesis presents the effects of cutouts in joists on the dynamic performance of wood floors. Ten floors and four-floor joist types were used to evaluate the vibrational response of wood floors with and without cutouts in the joists. Each floor was also subjected to different boundary conditions …
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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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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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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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Vibration characteristics of joist and joist-girder members
… and correct vibration problems. Long span-joists and joists-girders, with a span greater than forty feet, have not been considered for Murray's criterion and the Modified Reiher-Meister scale. This study shows that these two methods can be used to predict the acceptability of a long span …
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Fundamental frequencies of I-joist, solid-sawn wood joist, and truss floors based on tee-beam modeling
… and their frequencies were measured. The floor joists investigated included: solid sawn, parallel chord floor trusses, and composite I -joists. The first natural frequency of each tee-beam floor was predicted after measuring the deflection under imposed loading. A design procedure is presented …
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Improving the vibrational performance of wood floor systems
… floor systems constructed With either solid-sawn joists, I-Joists, or parallel-chard-trusses. Furthermore. using the model. it is shown that appropriate structural modifications can be used to improve the performance of wood floor systems by increasing natural frequency and reducing peak …
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Feasibility Study of Partially Restrained Connections
… the element. Combining this idea with steel joists, which are also quite common in construction, makes for shallower story heights and lower steel weights. This initial study analyzes partially restrained connections for both hot rolled shapes and steel joists using non-composite and …
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