Papers by Keyword: Push-Out Test

Abstract: Composite steel-concrete sections have a broad benefit through increasing structural strength as well as minimizing the self-loads. All past researches were concerned with pre-installed shear connectors (PRSC) in the manufacturing of composite sections. A new fabrication technique for steel-concrete-steel composite sections were presented in the current study by the post-installation shear connectors (POSC) passed-through an embedded polymerizing vinyl chloride (PVC) pipes. The performance of normal strength concrete prisms with a specified strength of 32 MPa connected to square steel tubes (SST) was investigated. Six specimens were fabricated in both methodologies, PRSC and POSC were experimentally tested by Push-out test. The spacing of the shear connectors was changed for every two specimens fabricated in two different ways in order to obtain a full behavioral view. However, POSC does not have full-bond to concrete prisms, the test revealed a comparable strength of POSC specimens. The test shows a slight increase in the ultimate strength of PRSC specimens by (12.11, 11.19, and 9.45) % than POSC specimens for 100mm, 150mm, and 200mm spaced shear connectors.

Abstract: Fe-SMA is attempted to be applied to large structural members such as pipe joints and vibration absorbers. However, if the pipe joint is used as pipelines and curved pipes in the underground, etc., it is considered that the applications require the long endurance for several loading conditions at various deformation rates. In the past, the axial strength of the pipe joint is estimated under a quasi-static tensile test at just single strain rate. However, it is hard to find papers which estimate the axial strength of the pipe joint as well as examining its rate sensitivity. In this study, at first, the pipe joint made of Fe-SMA is prepared. It is attempted to conduct a push-out test at various deformation rates and find the joint strength when a tightening function of the joint is lost. Here, the joint strength is defined by the strength when circumferential strain on the surface of joint starts decreasing. Additionally, rate sensitivity of axial strength defined is discussed.

Abstract: The LVL-concrete composite (LCC) structure is a hybrid in system which the LVL member is well connected to the concrete slab by a connector to produce composite action. Various types of connector with different stiffness and shear capacity are available in the market currently. The stiffness of the connector is identified through the push-out experiment. The notch connections for LVL concrete composite beams have higher stiffness and strength compared to mechanical fasteners. This paper discusses the experimental results of symmetrical push-out tests on 3 different types of connector, 150mm rectangular notch with 10mm diameter screw, 100mm rectangular notch with 8mm diameter screw and 100mm triangular notch with 8mm diameter screw. The experimental test was shear push out to failure and the type of failure was discussed. The 150mm rectangular notch was found to be strongest among all and low cost. The 100mm rectangular notch was found to be slightly stiffer than 100mm triangular notch but 100mm triangular notch is easier to construct with only 2 cut. The maximum strength and stiffness at ultimate limit states and serviceability limit states of each type of connection were discussed in this paper.

Abstract: This work presents the experimental tests carried out to evaluate the behaviour of different types of shear connectors proposed for cold formed steel (CFS) section integrated with ferrocement slab as potential used for composite beam. Ten push-out test specimens of cold-formed steel lipped channel sections connected with ferrocement slab were tested. Three types of shear connectors were studied comprised of bolts, self-drilling-screw and bar angle. The connection behavior is analysed in terms of its load-slip relationship and the failure mode. The parametric studies were performed to investigate the effect on the shear connector’s capacity by varying the number of layers of wire mesh used in ferrocement slab and types of shear connector used. A theoretical analysis (Eurocode 4) was carried out to verify the experiment results. The results show that the experimental and theoretical proved to have good agreement with each other.

Abstract: According to the previous experimental research on bond-slip, select push-out test as experimental method research on bond-slip between cold-formed thin-walled steel and foam concrete. Through the observation of the specimens in the push-out test, combining with the natural bonding mechanism and influencing factors summarized the failure mode and its law of composite member. The reference and basis for the experimental research and theoretical analysis of it in the future are provided.

Abstract: Based on the push-out test of the improved PBL shear connector, a finite element modal was established. In the FEA software of ANSYS, element type of Solid65 was adopted to simulate concrete; element type of Solid45 was adopted to simulate perforated rebar and steel plate, and element type of Conta173 and element type of Targe170 were adopted to simulate the interaction between perforated rebar and concrete, corrugated perforated plates and concrete. From the calculation of finite element modal, carrying capacity of the shear connector and the relative slip between steel plate and concrete were got. By comparing, the result of experiment is well with the result of calculation. Furthermore, the finite element modal is used to simulate mechianial properties of double row holes PBL shear connector. From the result of calculation, it can be concluded that the carrying capacity of double row holes shear connector is higher than the single row hole shear connector.

Abstract: Push-out tests were conducted to study the performance of shear studs in composite beams with profiled sheeting. All stud specimens were through-deck welded on steel beams. Three variables, i.e. the presence of profiled sheeting, the direction of the steel sheeting and the loading patterns were studied. Comparison between test results and predictions according to design specifications were also proposed. The research shows that, direction of the profiled steel sheeting has little influence on the ultimate load with shank shearing failure; shear failure of concrete rib decreases the shear strength; and the shear resistance of a parallel concrete rib is about twice of a transverse one.

Abstract: Relying on a practical application in pre-stressed concrete box-girder with corrugated steel web, four angle shear connector specimens are made and experimented in push-out test. The results show that: in the ultimate load level, failure model appears after large slip occurring between connector and concrete which shows a good ductility of angle shear connector. The main influence factors for the bearing capacity of connector is thickness of angle web, U-shaped steel provides certain shear resistance ability to same extent. Finally, through the contrast analysis between measured values and theoretical values, a new bearing capacity formula is proposed. Compared with the recommended formulae, the calculated results from proposed formula is most close to the text results, thus new formula can be used for security design and calculation.

Abstract: Relying on a practical application in pre-stressed concrete box-girder with corrugated steel web, four models of Twin-PBL shear connector are made and experimented in push-out test. The main research contents are influences for bearing capacity and load-slip relationship. The results show that: when the size of holes on the steel plate has a definite value, the connectors bearing capacity get a significantly development when the diameter of reinforced-throughout increases in the appropriate range. If the space between reinforced-throughout and holes are too small, the coarse aggregate will be prevented into the holes so as to reduce its bearing capacity. In addition, thickness of steel plate has less influence on bearing capacity of connectors. All models show similar load-slip trend and superior ductility. Finally, according to comparing and analyzing differences between calculated values from recommended formulas and measured values from tests, a new formula is deduced which can estimate the test results well. The standardization of push-out test needs further research so that Twin-PBL Shear Connectors can be widely used in project.

Abstract: The various push-out tests have been performed to investigate the load carrying capacity and ultimate behavior of headed studs in UHPC (Ultra High Performance Concrete), which has high compressive and tensile strength as well as high durability compared to ordinary concrete. The test program included the studs with a diameter of 16mm and 22mm for various aspect ratios (height to depth ratio of a stud) and cover depths. This paper presents the main results of the experimental investigations.