scholarly journals Push-Out Tests on Large Diameter and High Strength Welded Stud Connectors

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Fei Yang ◽  
Yuqing Liu ◽  
Yongjun Li
Keyword(s):  
Shear Strength ◽  
Large Diameter ◽  
Shear Stiffness ◽  
High Strength ◽  
Long Span ◽  
Cable Force ◽  
Aashto Lrfd ◽  
Stud Connector ◽  
Push Out ◽  
Shear Strength Reduction

In recent years, steel-concrete composite cable-pylon anchorages are increasingly employed in the construction of long-span cable-stayed bridges, especially in China. Welded stud connectors, typically 19 mm and 22 mm in diameter, are usually densely arranged at the interface between the steel anchorage box and the wall of the concrete pylon to transfer the huge cable force into the concrete pylon. However, dense welded stud arrangements at the interface have some disadvantages, such as the shear strength reduction of stud connectors and the difficulties in arranging reinforcements and pouring pylon concrete. Larger diameter and higher strength welded studs may be excellent alternatives since they both could increase the shear strength of a single stud connector and thus reduce the required number of welded studs. In this paper, push-out tests were implemented on four groups of welded stud connector specimens, including conventional 22 mm welded studs, 22 mm welded studs with much higher strength, 25 mm welded studs, and 30 mm welded studs. The shear strength, shear stiffness, and ductility of these welded stud connectors were investigated and compared with the predictions by the equations recommended in existing design codes. The results show that the shear strength of welded stud connectors could be conservatively determined by Eurocode 4, while AASHTO LRFD will produce a suitable estimation. The load-slip relationships proposed by Ollgaard and Buttry can be used to predict the load-slip curves of large diameter and high strength welded stud connectors.

scholarly journals Documentation of the Corrosion of Composite-Extruded Aluminium Matrix Extrusions Using the Push-Out Test

2008 ◽  
Vol 43 ◽  
pp. 17-22 ◽  
Author(s):  
Matthias Merzkirch ◽  
Kay André Weidenmann ◽  
Eberhard Kerscher ◽  
Detlef Löhe
Keyword(s):  
Shear Strength ◽  
High Strength ◽  
Spring Steel ◽  
Aluminium Matrix ◽  
Corrosive Media ◽  
Corrosive Attack ◽  
Galvanic Couple ◽  
Space Frames ◽  
Push Out

A possibility to increase both stiffness and strength of aluminium-based structures for the application in lightweight profiles for vehicle space frames is the use of composite extrusions in which high-strength metallic reinforcements are incorporated. Within the scope of the present investigations, composite-extruded profiles with wire-reinforcements made of austenitic spring steel 1.4310 (X10CrNi18-8), in an aluminium matrix AA6060 (AlMgSi0.5), which were exposed to different corrosive media for different times, were characterised in terms of the debonding shear strength using the push-out-technique. The formation of a galvanic couple could be conceived mathematically in regard of terms describing the formation of a shear-impeding layer and the corrosive attack. Thereby the parameters for the different media could be determined.

Test Study of Shear Strength of High Strength Stone Masonry

2010 ◽  
Vol 452-453 ◽  
pp. 365-368 ◽  
Author(s):  
Da Lin Hu ◽  
Feng Cheng ◽  
Long Gang Chen
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
High Strength ◽  
Stone Masonry ◽  
Aggregate Concrete ◽  
Long Span ◽  
Test Study ◽  
Design Value ◽  
Concrete Joints ◽  
Arch Bridges

In China many long span stone arch bridges were built in the last 5 decades, most of these bridges were built with micro-aggregate concrete joint masonry. However, the mechanical properties of this kind masonry have been seldom studied. Based on 5 groups of specimens with C30 or C40 micro-aggregate concrete joints and dressed blocks, shear strength of the masonry is tested and analyzed, friction coefficients and empiric formulas of shear strength of the masonry are presented in this paper, design value of shear strength of the masonry is assessed and discussed.

scholarly journals The influence of the opening size on the shear performance of the cross-laminated timber (CLT) walls

BioResources ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. 7071-7085
Author(s):  
Daiyuan Zhang ◽  
Liming Shen ◽  
Xudong Zhu ◽  
Sujun Zhang ◽  
Meng Gong
Keyword(s):  
Shear Strength ◽  
Mechanical Performance ◽  
Shear Stiffness ◽  
High Strength ◽  
Load Test ◽  
Static Load Test ◽  
Cross Laminated Timber ◽  
Wall Panels ◽  
Shear Performance ◽  
The Cross

Cross-laminated timber is a wood product with excellent fire resistance and mechanical performance that is often used in tiny houses. Using the ASTM standard E564, the shear performance of cross-laminated timber wall panels, with and without openings, were investigated in this study. The specimens were made of spruce-pine-fir IIc lumber and installed on a test platform using high-strength bolts passing through them. This connection mode limited the displacements obtained in the test, primarily the shear displacements and rocking displacements. By comparing the static load test data of the three specimens with openings and the one without an opening, it was found that openings reduced the shear strength and shear stiffness. For the same sized rectangular opening, the shear stiffness of the cross-laminated timber panel was less when the wider side was horizontal (normal to the direction of the applied force). The shear stiffness of the cross-laminated timber wall panels can be effectively improved by reinforcing the areas near the openings with metal sheets. With reinforcement, the shear strength did not change drastically, but the damage to the cross-laminated timber wall panels was significantly reduced.

Experimental study on shear behavior of notched long-hole perfobond connectors

2018 ◽  
Vol 22 (1) ◽  
pp. 202-213 ◽  
Author(s):  
Xizhi Wang ◽  
Yuqing Liu ◽  
Yangqing Liu
Keyword(s):  
Shear Strength ◽  
Circular Hole ◽  
Shear Stiffness ◽  
Outer Edge ◽  
Repeated Loading ◽  
Shear Direction ◽  
Shear Connection ◽  
Hole Area ◽  
Composite Bridges ◽  
Push Out

It is restricted in applying perfobond connectors in steel-concrete composite bridges with shallow rib heights or narrow connector distances, because it is unfavorable to enhance shear connection by enlarging hole diameter of perfobond connectors and difficult to install transverse rebars in perforated holes. To address this issue, an alternative perfobond connector was proposed by making a notch on the outer edge of the lengthened circular hole in this paper. To investigate the differences of failure mode, shear strength, slip behavior, and load transferring mechanism between circular-hole and notched long-hole perfobond connectors, a total of eight push-out tests were performed. Experimental results show that the shear strength of notched long-hole perfobond connectors exhibits an increase of about 20% compared with that of circular-hole perfobond connectors, and the shear stiffness and peak slip increase by over 10%. The enlarged hole area in notched long-hole perfobond connectors could weaken contribution percentage of concrete dowel to shear capacities, although the shear strength increases as the product of concrete compressive strength and hole area raises. Repeated loading hardly impacts shear strength of perfobond connectors but raises peak slip by 11% and 14% of circular-hole and notched long-hole perfobond connectors, respectively. Compared with single-row connectors, multi-row connectors exhibit a reduction of about 5% in shear capacities and an increase of about 10% in peak slips. The first row along the shear direction in multi-row connectors would bear the maximum percentage of shear load. Based on push-out test results, several typical existing equations for predictions of shear strength are compared and evaluated.

Push-out tests of shear connectors for new fully assembled steel- concrete composite beams

2021 ◽  
Author(s):  
Hetao Hou ◽  
Ning Wang ◽  
Zengyun Zang
Keyword(s):  
Shear Strength ◽  
Load Transfer ◽  
Shear Stiffness ◽  
Composite Beams ◽  
Repeated Loading ◽  
Test Results ◽  
Floor Slab ◽  
Shear Connectors ◽  
New Type ◽  
Push Out

<p>To accomplish rapid installation and replaceability, a new type of connector for new fully assembled steel-concrete composite beams was studied. The connectors are fixed on the C-shaped channels of the prefabricated floor slab. The load transfer along the interface of the precast floor slab and the steel beam is primarily achieved through the friction between the beam flange and the channels. Push-out tests were conducted to study the mechanical properties of new composite beam. The effects of different C-shaped channel types, repeated loading and number of connectors were investigated. Test results showed that all the connectors exhibited satisfactory performance. When the section height of C-shaped channel is small, the restraining effect on the connector is more remarkable. The shear strength and shear stiffness of the connectors can be improved by reloading. The formulas for calculating the shear strength derived agree well with the experimental results.</p>

Strength and Stiffness of Corrugated Rib Connector

2011 ◽  
Vol 243-249 ◽  
pp. 1497-1503
Author(s):  
Qing Tian Su ◽  
Dong Fang Wang
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Composite Structure ◽  
Ultimate Load ◽  
Shear Stiffness ◽  
Test Results ◽  
New Type ◽  
Strength And Stiffness ◽  
Service State ◽  
Push Out

Connectors are the key element in steel and concrete composite structure. To research and develop new type connector for steel and concrete composite structure, a new type connector, corrugated rib connector, was developed. The base mechanical properties of this connector were tested by push-out tests. The test results shown the mechanical properties of this connector are excellent. Comparing to the push-out test results of perfobond rib connector, the shear strength of corrugated rib connector increased 24 percent than that of the perfobond rib connector, and the shear stiffness of corrugated rib connector is larger than that of the perfobond rib connector, Especially the ductility of corrugated rib connector is 1.9 times that of the perfobond rib connector when they reach the ultimate load. Based on the load-slip relation of corrugated rib connector by push-out tests, relative stiffness expressions under normal service state and ultimate bearing capacity state are obtained.

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