Effect of floor openings on the capacity of composite space trusses

El-Shami, Mostafa M.; Mahmoud, Sayed; Elabd, Maher

doi:10.1016/j.jksues.2016.03.002

Cited by 9 publications

(5 citation statements)

References 16 publications

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“…Mostafa El-Shami et al [4]presented the behaviour of composite space truss in the presence of openings. Both experimental and analytical with different end conditions for various location of openings are carried out.…”

Section: Marimuthu Et Almentioning

confidence: 99%

Numerical Studies on Composite Deck Slab With Floor Openings

Mary¹,

Raja²

2022

ASPS Conf. Proc.

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Openings in slabs are provided mainly for service works. According to the purpose of the services, the size of the openings was classified as small, medium, and large. The provision of openings in a composite slab was not addressed in design codes like EC-4 and IS 11384. Normally the Longitudinal shear interaction is the influencing factor in determining the capacity and elastic rigidity of a composite slab which may be affected by the presence of openings. In the market, there are various forms of embossment/indentation available to enhance the interlocking at the interface of the Cold Form Steel decking sheet and the topping concrete thereby an increased longitudinal shear resistance can be achieved at the interface. In this numerical study, Among the various type of embossments, combined types of embossments (rectangular and chevron) are considered then the m and k values are determined with the help of the Penalty Friction interaction approach and the same was verified with the known experimental values for a solid slab. In addition, Finite Element [FE] models with various sizes of floor openings were created under the guidelines of SCI publication P300 and SDI Technical Guidance on Deck Damage and Penetrations. The effects of those openings located in the high shear region and no shear region are studied. The simulated load-deflection responses of various FE floor opening models were compared.

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Section: Marimuthu Et Almentioning

confidence: 99%

Numerical Studies on Composite Deck Slab With Floor Openings

Mary¹,

Raja²

2022

ASPS Conf. Proc.

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“…The natural forms act in the direction of the least force [5]. Double-Layer Space Trusses comprise a set of members that are assembled to give different shapes, such as flat system, curved system, spherical system, and convex system [6,7]. The DLST is widely known for its square-on-square configuration system, and is also a type of system that possesses high structural redundancy and exceptional spatial ductility [8].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Analysis for Eccentricity Solution in Double-Layer Space Truss

Vital,

Silva,

Bezerra

et al. 2024

Buildings

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This paper shows an extensive study on the Typical Connections used in Double-Layer Space Truss. For this structural system, the ends of the bars are flattened to connect the bars. However, the flattening process results in a highly plastic stamping zone susceptible to warping with the appearance of two eccentricities, one of which causes rotation of the connection, with the presence of a bending moment with local rupture resulting in progressive collapse of the entire coverage system, as already evidenced in several countries. Therefore, eccentricity in this paper is studied and an analytical solution to the problem is presented through the use of a new device called a spacer. Furthermore, a preliminary study with complex numerical simulation was carried out with nonlinear analysis in ABAQUS were evaluated. For this study, nine space trusses were experimentally tested with reinforcement spacer in reduced trusses. After confirming the efficiency of the spacer proposal, another six space trusses were tested in the laboratory, this time, on a full-scale. In this study, two types of spacers were evaluated, one made of USI SAC 350 steel and another cheaper one made from recycled tires from heavy vehicles with multiple filaments of steel and nylon wires in the rubber layers. The two devices presented very close resistance capacity values, with a resistance gain of approximately 30% in relation to connections without reinforcement, with structural failure characterized by buckling of the bars. Finally, a numerical study of space trusses with spacers was developed. In practical design terms, from these FE simulations it was possible to determine the normal stresses for different spacers applied in the different modeled spans.

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“…MERO connection was widely used commercially and was developed in Germany by Dr. Ing. Max Mengeringhausen and Rohbauwwise [1,5,[11][12][13][14][15][16][17][18] (see Figure 1). After the invention of the MERO connection, several other systems were patented with the same principle: Steel ball, hexagonal screw, connection sleeve, and hollow section bar.…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis of Space Trusses Using Spacers of Concrete with Steel Fiber and Sisal Fiber

Silva

Bezerra

et al. 2020

Materials

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Space trusses are structural systems, generally made of tubes, used worldwide because of their advantages in covering long-span roofs. In addition to having a low cost, the truss weight is relatively reduced. The load capacity of these structures depends also on the strength of their node connection. Connections made with the superposition of flattened tube ends trespassed by one bolt are, generally, known as typical nodes. They are inexpensive but present eccentricities that reduce significantly the strength of such space trusses. To increase the truss load capacity, this research presents the results of an experimental program to reduce the eccentricities of the typical nodes. This reduction is done with a new type of spacer made of encapsulated concrete with steel fiber or sisal fiber. The experimental tests showed that the trusses with typical nodes collapsed under reduced load by local failure due to high distortions at the nodes. The trusses with encapsulated concrete spacer showed good results, with an increase in collapse load of 36% and failure by buckling bars.

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Effect of floor openings on the capacity of composite space trusses

Cited by 9 publications

References 16 publications

Numerical Studies on Composite Deck Slab With Floor Openings

Numerical Studies on Composite Deck Slab With Floor Openings

Experimental and Numerical Analysis for Eccentricity Solution in Double-Layer Space Truss

Experimental Analysis of Space Trusses Using Spacers of Concrete with Steel Fiber and Sisal Fiber

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