scholarly journals Experimental Study on an Innovative Shear Connector in Steel-UHPC Composite Structure

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Yang Liu ◽  
Dan Zeng ◽  
Lei Cao ◽  
Naiwei Lu
Keyword(s):  
Bearing Capacity ◽  
Failure Modes ◽  
Steel Plate ◽  
Least Square Method ◽  
Maximum Load ◽  
Least Square ◽  
Shear Connector ◽  
Shear Connectors ◽  
Shear Bearing Capacity ◽  
Push Out

In order to improve the stiffness and shear bearing capacity of steel-UHPC composite bridge, an innovative shear connector named arc-shaped reinforcement shear connector was proposed and compared with the stud and perforated bar steel plate shear connector using the static push-out test. Considering shear connector diameter, a total of ten push-out specimens for five groups were designed. The results indicated that the failure modes and failure mechanism of the arc-shaped reinforcement shear connectors were significantly different from stud shear connector and perforated bar steel plate. Obvious failure characteristics such as crack and reinforcement were not observed for the arc-shaped reinforcement specimens except for fine cracks on the top of one specimen, but these were observed for the others two types of shear connector. The relative slip value of arc-shaped reinforcement shear connector at the maximum load was the smallest and less than 1 mm in three types of shear connectors. The stiffness and shear bearing capacity of arc-shaped reinforcement were higher than those of stud and perforated bar steel plate under the same diameter. Increasing arc-shaped reinforcement diameter could improve significantly static behavior of shear connector. When the diameter of arc-shape reinforcement was increased from 8 mm to 12 mm, the ductility factor, stiffness, and shear bearing capacity of arc-shaped reinforcement shear connector were improved by 174.32%, 214.76%, and 54.2%, respectively. A calculation method of shear bearing capacity was proposed by the least square method and multiple regression analysis and agreed well with the test result.

scholarly journals Investigation of the Behaviour of Steel-Concrete-Steel Sandwich Slabs with Bi-Directional Corrugated-Strip Connectors

2020 ◽  
Vol 10 (23) ◽  
pp. 8647
Author(s):  
Mansour Ghalehnovi ◽  
Mehdi Yousefi ◽  
Arash Karimipour ◽  
Jorge de Brito ◽  
Mahdi Norooziyan
Keyword(s):  
Failure Modes ◽  
Steel Plate ◽  
Lightweight Concrete ◽  
Control Sample ◽  
Shear Connector ◽  
Normal Concrete ◽  
Concrete Core ◽  
Shear Connectors ◽  
Strength Based ◽  
Good Agreement

The most researches on steel-concrete-steel (SCS) sandwich slabs are to control the cracking of concrete core along with losing weight, and shear connector type. In this study, the behaviour of SCS slabs with bi-directional corrugated-strip shear connectors (CSC) was investigated. One of the most important practical problems of CSCs in SCS slabs is lack of access for another end welding to the second steel faceplate. In this research, plug weld was proposed to provide partial welding of the other end of CSCs to a steel plate. For this reason, three slabs were manufactured using the normal concrete core as a control sample and lightweight concrete (LWC) core with and without steel fibres. The behaviour of these slabs was compared with the behaviour of SCS slabs with J-hook and stud bolt connectors from previous researches. The specimens were tested under a concentrated block load as quasi-statically. Based on the load-displacement relationship at the centre, failure modes, loading capacity, energy absorption, and ductility showed acceptable behaviour for CSC system slabs. There was also a good agreement between the ultimate flexural strength based on experiments and previous research relationships.

Research on Influence Factors and Formulae for the Bearing Capacity of Twin-PBL Shear Connectors

2013 ◽  
Vol 353-356 ◽  
pp. 3167-3171
Author(s):  
Zhi Hui Zhang ◽  
Peng Liu ◽  
Shuan Hai He ◽  
Tong Geng Ji
Keyword(s):  
Bearing Capacity ◽  
Steel Plate ◽  
Influence Factors ◽  
Test Results ◽  
Box Girder ◽  
Main Research ◽  
Shear Connectors ◽  
Corrugated Steel Web ◽  
New Formula ◽  
Push Out

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.

Study on Ultimate Bearing Capacity and Anti-Slip of the Stud

2011 ◽  
Vol 99-100 ◽  
pp. 166-169
Author(s):  
Yi Min Dai ◽  
Xu Guang Yan ◽  
Jing Chen ◽  
Xiang Jun Wang
Keyword(s):  
Bearing Capacity ◽  
Test Data ◽  
Composite Structure ◽  
Concrete Strength ◽  
Composite Beams ◽  
Ultimate Bearing Capacity ◽  
Shear Connector ◽  
Shear Connectors ◽  
Stud Shear Connector ◽  
Push Out

Based on the test data of twelve push-out specimens with different holes filling different materials,the paper compared and analyzed the capacity and the corresponding slip value of the stud shear connector. The results show that, as to the two different kinds of holes shape ,the strength of the stud shear connectors of square push-out specimens was huger than that of circular specimens with the same condition; the strength of stud shear connectors in steel-concrete composite structure was decided by the strength of concrete surrounding the shear in the holes, with increasing concrete strength, the strength of stud shear connectors improved greatly; The outputs of this study are very useful for further understanding of the characteristics of the stud,it is also expected that the results presented in this paper should be valuable for the design of the composite beams.

Failure Mode Attribution Analysis of PBL Shear Connector

2013 ◽  
Vol 351-352 ◽  
pp. 683-686
Author(s):  
Wen Jiang Zhang ◽  
Er Xia Du ◽  
Bei Zhan Liu ◽  
Shao Chong Yang
Keyword(s):  
Failure Mode ◽  
Material Properties ◽  
High Strength Concrete ◽  
Failure Modes ◽  
Steel Plate ◽  
High Strength ◽  
Shear Connector ◽  
Related Factors ◽  
Shear Connectors ◽  
Attribution Analysis

Investigation on PBL shear connectors failure modes and their related factors is conducted. On the basis of analysis on the detail mechanism of PBL shear connectors failure modes, the relations between the construction factors and failure modes are summarized. A reasonable way of failure mode is proposed for exerting the material properties of all components in PBL shear connector. As reference to construction and design of PBL shear connector, it is advised that the high strength concrete should be used, and the strength of steel plate should be not less than that of rebar. The position and posture of rebar cannot be ignored.

scholarly journals Parametric study of I-shaped shear connectors with different orientations in push-out test

2021 ◽  
Vol 15 (57) ◽  
pp. 24-39
Author(s):  
Boursas Farid ◽  
Djamel Boutagouga
Keyword(s):  
Shear Strength ◽  
Parametric Study ◽  
Failure Modes ◽  
Concrete Strength ◽  
Steel Grade ◽  
Shear Connector ◽  
Shear Connectors ◽  
High Shear Strength ◽  
Push Out ◽  
Monotonic Load

A great deal of research has been conducted to improve the understanding of the behavior of new types of shear connectors. This article presents the study of I-shaped connectors behavior under monotonic load welded in four different orientations in order to get the position which gives the high shear strength and the best ductility. For this purpose, eight push-out test specimens with I-shaped shear connectors with different orientations and dimensions were tested in C20/25 and C30/37 concrete classes. The load-slip behavior and failure modes of the tested connectors are presented and discussed. Furthermore, a non-linear 3D finite element modelling of the push-out test is performed in order to further investigate the influencing parameters on the I-shaped connectors behavior. Hence, a parametric study is carried out by using the established 3D finite elements model to study the influence of concrete strength, connector’s steel grade, reinforcements, height and length of the connector. Both experimental and numerical results show that there is a privilege orientation for which the shear strength of an I-shaped shear connector is significantly higher than that of all other tested orientations.

Structural Performance of Typical Beam-Column Joints in Yingxian Wood Pagoda - An Experimental Study

2012 ◽  
Vol 517 ◽  
pp. 669-676 ◽  
Author(s):  
Zhi Yong Chen ◽  
En Chun Zhu ◽  
Jing Long Pan ◽  
Guo Fang Wu
Keyword(s):  
Failure Modes ◽  
Least Square Method ◽  
Vital Role ◽  
Least Square ◽  
Shanxi Province ◽  
Structural Performance ◽  
Vertical Load ◽  
Loading Test ◽  
Ancient Wood ◽  
Non Destructive

Yingxian Wood Pagoda, built in 1056, is located in the town of Yingxian County, Shanxi Province, China. It is the oldest and highest standing ancient wood structure in China. The pagoda is octagon-shaped in plan, with a total height of 67.31m and a base diameter of 30.27m. It appears as a five-storeyed structure, but actually consists of nine storeys, with four shorter but stiffer storeys hidden between the five apparent storeys. Yingxian Wood Pagoda was built without any metal connectors like nail, screw, or bolt. Instead, Tenon-Mortise connections and Dou-Gong brackets were used to connect all posts and beams. Tenon-Mortise connections and Dou-Gong brackets have been playing a vital role for the pagoda to resist severe winds, earthquakes and some human-induced disasters for nearly a thousand years. To evaluate the safety of the pagoda, it is, therefore, useful to investigate the structural performance of the beam-column joints, most important for Yingxian Wood Pagoda to resist lateral load. In this study, two models of typical beam-column joints of the pagoda, MBCJ-I and MBCJ-II, were manufactured following a ratio of 3.4 to the prototype of the joints. Non-destructive cyclic loading test of the models under different vertical load and destructive cyclic test of the models under vertical load of 20kN were conducted. The hysteretic stiffness of MBCJ-I was lager than MBCJ-II, and increased linearly with vertical load N. The relationship between and N was obtained by regression of the test results using the least square method. The stiffness of model joint under vertical load was 70.6kN/mm. The failure modes, energy-dissipation performance, moment resistance and bending stiffness of both model joints were derived and discussed.

ESTIMATION OF THE POWDER-ACTUATED SHEAR CONNECTORS TESTS

2021 ◽  
Vol 295 (2) ◽  
pp. 16-26
Author(s):  
D.V. Konin ◽  
Keyword(s):  
Bearing Capacity ◽  
Estimation Methods ◽  
Shear Connector ◽  
Connection Strength ◽  
Test Results ◽  
European Standard ◽  
Design Code ◽  
Shear Connectors ◽  
Shear Connection

The shear connector design should be executed according to the SP 266.1325800.2016. For the different typed of welded connectors are there analytic dependences, which could be used for shear connection strength estimation. The design code also allows to use powder-actuated Z-shape shear connectors. Their bearing capacity should be proved by tests according to the GOST R 58336-2018. Inasmuch the GOST doesn't consist the test estimation approach, the authors offer the method. For the test estimation methods the test results of 15 series specimen had been used. The results were compared with estimation according to the European standard for the verification.

scholarly journals Buckling Analysis and Section Optimum for Square Thin-Wall CFST Columns Sealed by Self-Tapping Screws

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
He Zhang ◽  
Kai Wu ◽  
Chao Xu ◽  
Lijian Ren ◽  
Feng Chen
Keyword(s):  
Bearing Capacity ◽  
Failure Modes ◽  
Steel Plate ◽  
Local Buckling ◽  
Steel Tube ◽  
Thin Wall ◽  
Type Section ◽  
Plate Buckling ◽  
Thin Walled ◽  
Cfst Columns

Two columns of thin-walled concrete-filled steel tubes (CFSTs), in which tube seams are connected by self-tapping screws, are axial compression tested and FEM simulated; the influence of local buckling on the column compression bearing capacity is discussed. Failure modes of square thin-wall CFST columns are, first, steel tube plate buckling and then the collapse of steel and concrete in some corner edge areas. Interaction between concrete and steel makes the column continue to withstand higher forces after buckling appears. A large deflection analysis for tube elastic buckling reflects that equivalent uniform stress of the steel plate in the buckling area can reach yield stress and that steel can supply enough designing stress. Aiming at failure modes of square thin-walled CFST columns, a B-type section is proposed as an improvement scheme. Comparing the analysis results, the B-type section can address both the problems of corner collapse and steel plate buckling. This new type section can better make full use of the stress of the concrete material and the steel material; this type section can also increase the compression bearing capacity of the column.

Mechanical Performance between the Embedded Steel Plate and the Concrete in Composite Shear Walls

2013 ◽  
Vol 742 ◽  
pp. 56-61 ◽  
Author(s):  
Wan Lin Cao ◽  
Hong Ying Dong ◽  
Wen Jiang Zhang ◽  
Jian Wei Zhang
Keyword(s):  
Bearing Capacity ◽  
Work Performance ◽  
Steel Plate ◽  
Mechanical Performance ◽  
Shear Walls ◽  
Concrete Wall ◽  
High Rise ◽  
Concrete Plate ◽  
Shear Bearing Capacity ◽  
Composite Shear

In order to strengthen the co-work performance between the steel plate and concrete, the anchorage construction of arrayed studs were welded on both sides of the plate according to a super high-rise building in Beijing. Eighteen specimens of embedded steel plate concrete shear walls with arrayed studs were tested by pushing out under monotonic loading in this paper. Some parameters, such as the thickness of the concrete wall, the thickness of steel plate, the diameter, the length and the amount of the studs and the rate of reinforcement for distributing bars in the walls were considered. The shear bearing capacity, load-slip relationship, strains of the steel plate and studs, mechanical properties and failure mode were analyzed. The effect of stud layout on the coordinate work of the concrete plate was studied. Results show that the shear bearing capacity is obviously improved by using smaller diameter studs or decreasing the distance between studs when the total area of studs is kept unchanged. The thickness of the steel plate has almost no effect on the shear bearing capacity. The ratio of the length to the diameter of the studs should be not less than 4. A simplified mechanics calculated method to estimate the shear bearing capacity of this kind of shear wall was put forward. And the calculated results are in good agreement with the experimental results.

Mechanical Properties Research of Steel-Concrete Composite Structure's Connector

2013 ◽  
Vol 738 ◽  
pp. 128-132
Author(s):  
Xiu Yong Si ◽  
Jian Bo Zhao ◽  
Xiang Zhong Bai
Keyword(s):  
Bearing Capacity ◽  
Shear Failure ◽  
Rapid Development ◽  
Influence Factors ◽  
Shear Stiffness ◽  
Transmission Mechanism ◽  
Shear Connector ◽  
Force Transmission ◽  
Shear Connectors ◽  
New Type

A new type of PBL shear connector gets more attention with the rapid development of steel-concrete composite structure. The PBL shear connector's static behavior and influence factors thereof are analysed through experiments. The PBL shear connector's force-transmission mechanism is discussed. The conclusions show that the thickness of perforate plate has significant impact of PBL shear connectors design bearing capacity, shear stiffness and ultimate bearing capacity. According to the thickness of perforate plate, the failure mode of PBL shear connector may appear to flexural and shear failure of perforate rebar, shear failure of perforate rebar or shear failure of perforate plate.

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