Experimental investigation on flexural performance of semi‐precast reinforced concrete one‐way slab with joint

Liu, Yunling; Huang, Junqi; Xiao, Chong; Xian-guo, YE

doi:10.1002/suco.202000676

Cited by 19 publications

(8 citation statements)

References 18 publications

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“…The state recommends the use of high-grade concrete and high-strength steel reinforcement. High-performance concrete has the advantages of high strength, high toughness, low strain rate at high temperatures and adaptability to special environments [23][24][25][26][27][28][29]. Based on this, the new assembled beam-column node components are made of C80 high-strength concrete, which can effectively reduce the cross-sectional size of the columns and save floor space compared with ordinary-strength concrete columns, while the integral strength and stiffness of the structure will also be improved, making it easier to meet the design code requirements of "strong columns and weak beams" [30].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Studies on the Seismic Performance of New Assembled Concrete Frame Beam–Column Joints

Liu

2023

Buildings

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A new type of assembled concrete beam–column joint based on a bolted connection was proposed, aiming to complete the post-earthquake node repair work by replacing precast beams and bolts. To study the seismic performance of the new beam–column joints, two full-scale components of the new joints were fabricated and subjected to low cyclic loading. The whole process from crack generation to component failure was investigated in detail, and seismic performance indicators such as the hysteresis curve, skeleton curve and stiffness degradation curve were compared and analyzed. Based on the experimental results, ABAQUS finite element software was applied to numerically simulate cast-in-place joints and test joints. Based on the failure mechanism of the new assembled beam–column semi-rigid joints, a stress analysis of semi-rigid joints was carried out. The research results show that the two new joints have good seismic performance and energy dissipation performance. Bolts and precast beams are the main stress components, and the repair of new joints can be completed by replacing bolts, which meets the seismic design concepts of “strong columns and weak beams” and “strong joints and weak components”. The larger the diameter of the bolts, the higher the load capacity and the lower the stiffness degradation rate. The finite element simulation results are high-accuracy and can well reflect the seismic performance of the components. It is found that cast-in-place joints are better in energy dissipation capacity than test joints, but the ultimate bearing capacity of test joints is better than that of cast-in-place joints. Based on the experimental stress characteristics of the nodal core zone, a mechanical analysis model of the nodal core zone of the new assembled concrete beam–column joints is proposed, and shear force calculation equations for the core zone of the new assembled concrete beam–column rigid joints and semi-rigid joints are derived.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Studies on the Seismic Performance of New Assembled Concrete Frame Beam–Column Joints

Liu

2023

Buildings

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“…The upper chord moment calculating formula has been recognized. Liu et al [22] studied the influence of connections on flexural performance of semi-precast slabs having steel truss on the precast portion and used finite element analysis to reproduce the experiments. The results showed that the steel truss could reduce the brittle failure and change it to a ductile failure to improve the flexural strength of the slab.…”

Section: Introductionmentioning

confidence: 99%

Effect of Stirrups on the Behavior of Semi-Precast Concrete Slabs

Abdullah

Mosheer

2022

Civ Eng J

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A semi-slab of precast concrete (or half-slab) is a structural system that consists of concrete at the bottom half of a slab and concrete cast in situ at the top. To avoid traditional formwork and minimize the bottom half of the slab, this section can function as formwork and reduce the thickness of precast slabs, which makes their transportation easy. The interface between precast and overtopping concrete is effective for the slab system's performance. To improve the half-slab floor system, it is needed to have a shear connector (stirrups). Therefore, to better understand the behavior of this slab system, six full-scale slab specimens (2×7.5 m) with different shapes of the stirrups and spacing between them were constructed for this study. One specimen was produced with no connections and served as a reference specimen, while the other employed stirrups to connect slab units. The tests found that the distribution and type of stirrups affect the structural performance of the semi-precast concrete slab. The maximum load capacity of slabs with rectangular or triangular connections was nearly more significant than reference slabs, reaching 136.11 and 86.11%, respectively. The maximum load increased by 81.4 % for rectangular connections and 54.9% for triangular connections when the distance between the connectors was reduced from 600 to 300 mm. Furthermore, stirrups in semi-precast slabs could improve the cracking behavior, stiffness, and ductility. Doi: 10.28991/CEJ-2022-08-08-09 Full Text: PDF

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“…Te above-reviewed research focused on the bridge slabs having a thickness of over 200 mm, and the corresponding CIP layer was much thicker than that in the LGSs for buildings. Among the studies on the LGSs with thin thickness, Liu et al [14] adopted the connection detailing as in Figure 2(a) in the LGSs for building structures. Tey experimentally investigated the efect of slab thickness, truss element spacing within the lapping zone, and lap length of crossbar on the fexural behavior of one-way LGSs where the connections were in the middle.…”

Section: Introductionmentioning

confidence: 99%

Flexural Behavior of Lattice Girder Slabs with Different Connections: Experimental Study

Yun

Jiang

Chen

2022

Advances in Civil Engineering

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Lattice girder slab (LGS) is a precast composite slab that serves as an alternative to conventional concrete-in-place (CIP) slabs. The load-bearing capacity of joints for the LGSs is essential for large-span slabs with precast constructions, while limited connections could achieve both free-of-formwork construction and higher flexural bearing capacity. In order to enhance the flexural behavior of LGSs with free-of-formwork joints, the straight bar lapping connection away from the midspan, loop connection, and straight bar lapping connection within keyway for midspan joints were proposed in this study. Seven full-scale one-way LGSs with different transverse connections were tested under the four-point bending tests to investigate the joint behavior. The overall response and failure mode were observed during the test. The load versus midspan deflection, deflected shape, and characteristic load capacity were analyzed and discussed. The study showed that all the slabs’ deformability could reach as high as l/50 without load reduction. The LGS with the straight bar lapping connection in the midspan had the lowest flexural capacity (70% of the capacity for LGS without joints), while the flexural resistance of the slabs with other connections could be increased by 21.4% to 44.6% compared to LGSs with the traditional straight bar lapping connection in the midspan. The LGSs with the connections having keyways had the most significant improvement and could achieve high flexural capacity and 110% of deformability of the LGS without joints. The findings could enrich the connection types for LGSs for construction convenience and mechanical efficiency and further provide reference for the design of the two-way LGSs.

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Experimental investigation on flexural performance of semi‐precast reinforced concrete one‐way slab with joint

Cited by 19 publications

References 18 publications

Experimental and Numerical Studies on the Seismic Performance of New Assembled Concrete Frame Beam–Column Joints

Experimental and Numerical Studies on the Seismic Performance of New Assembled Concrete Frame Beam–Column Joints

Effect of Stirrups on the Behavior of Semi-Precast Concrete Slabs

Flexural Behavior of Lattice Girder Slabs with Different Connections: Experimental Study

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