Flexural and Shear Performance of Prestressed Composite Slabs with Inverted Multi-Ribs

Abstract

Half precast concrete slabs with inverted multi-ribs (Joint Advanced Slab, JAS), which enhance composite performance between slabs by introducing shear keys at connections between the slabs and improve structural performance by placing prestressing tendons and truss-type shear reinforcements, have recently been developed and applied in many construction fields. In this study, flexural and shear tests were performed to verify the structural performance of JAS members. Towards this end, two flexural specimens and four shear specimens were fabricated, and the presence of cast-in-place concrete and the location of the critical section were set as the main test variables. In addition, the flexural and shear performance of the JAS was quantitatively evaluated using a non-linear flexural analysis model and current structural design codes. Evaluation results confirmed that the flexural behavior of the JAS was almost similar to the behavior simulated through the non-linear flexural analysis model, and the shear performance of the JAS can also be estimated appropriately by using the shear strength equations presented in the current design codes. For the JAS with cast-in-place concrete, however, the shear strength estimation results differed significantly depending on the way that the shear contributions of the precast concrete unit and cast-in-place concrete were calculated. Based on the analysis results, this study proposed a design method that can reasonably estimate the shear strength of the composite JAS.

Shear Behavior of Concrete Encased Steel Truss Composite Girders

“…where f c is the compressive strength of concrete; A s and f s are the section area and stress of the diagonal web member, respectively; s is the spacing of the web members; and α is the angle of the diagonal member. Table 5 shows the shear strengths of the specimens calculated using Equations ( 5)- (7). The proposed equation only provided an estimation of the shear strength of the specimens.…”

“…Composite structural systems are widely used in construction sites because they afford long spans and reduced floor heights. In this regard, steel-concrete composite members with structural performance improved by efficiently utilizing the advantages of concrete and steel [1][2][3][4][5][6][7], prestressed concrete members with flexural and shear performance improved by introducing prestress into concrete with low tensile strength [8][9][10], and composite members applied with fibers and high-performance materials [11][12][13][14][15][16][17][18][19] have been developed hitherto.…”

“…Monti and Petrone [2] proposed shear capacity equations for composite truss beams and verified their proposed model based on nonlinear analysis and experiments. Ayyub et al [6,7] experimentally verified the resistance performance of prestressed steel-concrete composite members against positive/negative moments and suggested a linear analysis method for prestressed steel-concrete composite girders based on their experimental results. Khuntia et al [12] obtained shear test results of reinforced concrete members incorporating normal or high-strength fibers through a literature review and proposed a shear strength equation suitable for fiber-reinforced concrete based on the shear database collected.…”

Development of Multi-Tee-Type Precast Concrete Slabs with Insulating Materials for Structural Safety at the Construction Stage

“…Hence, reducing the PC slab volume has a great influence on the construction cost. The slabs used in the oneway PC method include hollow core slabs [1][2][3][4][5][6][7][8][9][10][11][12], double-tee slabs [13][14][15][16][17][18][19][20], and invertedtee slabs [21][22][23][24][25][26][27][28]. The double-tee slab, which has a section with the largest distance between the compression zone in the concrete and the tensile reinforcing bar for flexural bending, has great section efficiency when compared with its member weight.…”

Research on semi-precast prestressed concrete slab under short-term and long-term load

“…Rib elements with a common bottom plate are currently more and more popular constructions and are actively developed [4]. Researches are mainly focused on concrete topping and longitudinal shear [5]. The shape of the shear-key created between neighbouring TerivaPanel panels is designed to take over transverse forces (without having to reinforce joints) and redistribute the loads to the adjacent precast panels, as in other precast solutions [6][7][8].…”