Slip coefficient of 90-year-old riveted joint surface with red lead paint for corrosion

2021 ◽  
Author(s):  
Yu Chen ◽  
Takashi Yamaguchi ◽  
Motoshi Yamauchi ◽  
Keita Ueno
Keyword(s):  
Pressure Distribution ◽  
High Strength ◽  
Joint Surface ◽  
Steel Bridge ◽  
Slip Coefficient ◽  
Lead Paint ◽  
Riveted Joints ◽  
Riveted Joint ◽  
Red Lead ◽  
Joint Section

<p>Before 1950, steel bridges were basically connected by rivets. Most of the steel bridge has been replaced due to aging or corrosion. However, many rivet bridges are still being in service; some of the rivets might be corroded and loosen due to the paint coating's deterioration. The riveted bridge has to repair by replacing the corroded rivets with high-strength bolts for friction connection. However, the slip coefficient of riveted joint surfaces with red lead treatment is not specified. In this study, specimens cut out from a 90-year-old riveted bridge's joint section and evaluated the riveted joint surface's aging condition by microscope observation and elemental analysis. The slip and pressure distribution tests are also conducted to investigate the slip coefficient and pressure distribution of riveted joints' surface. It is found that the joint surface is not flat, the average slip coefficient is 0.274, and the −2&#120590; is calculated to 0.169.</p>

Experimental study on mechanical behavior of combined joint using adhesives and high strength bolts

2021 ◽  
Author(s):  
Takuya Kamino ◽  
Takashi Fujimoto ◽  
Takashi Yamaguchi ◽  
Yasumoto Aoki ◽  
Shinsuke Akamatsu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Design Method ◽  
High Strength ◽  
Corrosion Damage ◽  
Epoxy Adhesive ◽  
Steel Bridge ◽  
Slip Coefficient ◽  
Constraint Effect ◽  
Slip Resistance

<p>As a repair for corrosion damage of a steel bridge, a patch plate-repair using high strength bolts is generally applied. This method requires the surface of the damaged corroded part filled with an epoxy adhesive flat. The load transferring mechanism and slip resistance of such a combined joint with adhesives and high strength frictional bolts aren't clear. Since the shear strength of an adhesive might be increased due to constraint by the bolt axial force, the combined joint's slip resistance would be increased. To clarify the mechanical properties of the combined joint and to propose a new design method for such joints, two experiments have been conducted. The first was a frictional force experiment for adhesive specimens subjected to contact pressure on the surface to evaluate the constraint effect of adhesive on shear strength quantitatively. The last one is a slippage experiment for the combined joints to evaluate its slip coefficient.</p>

Deformation Law of Cold Drawing Process of High Strength Bridge Cable Steel

2021 ◽  
Vol 1035 ◽  
pp. 801-807
Author(s):  
Xiao Lei Yin ◽  
Jian Cheng ◽  
Gang Zhao
Keyword(s):  
Strain Path ◽  
High Strength ◽  
Cold Drawing ◽  
Wire Drawing ◽  
Radial Deformation ◽  
Steel Bridge ◽  
Drawing Process ◽  
Single Pass ◽  
Potential Relationship ◽  
The Wire

High-strength cable-steel bridge is the “lifeline” of steel structure bridges, which requires high comprehensive mechanical properties, and cold-drawing is the most important process to produce high-strength cable-steel bridge. Therefore, through the ABAQUS platform, a bridge wire drawing model was established, and the simulation analysis on the process of stress strain law and strain path trends for high-strength bridge steel wire from Φ 12.65 mm by seven cold-drawing to Φ 6.90 mm was conducted. The simulation results show that the wire drawing the heart of the main axial deformation, surface and sub-surface of the main axial and radial deformation occurred, with the increase in the number of drawing the road, the overall deformation of the wire was also more obvious non-uniformity. In the single-pass drawing process, the change in the potential relationship of each layer of material was small, and multiple inflection points appeared in the strain path diagram; the change in the seven-pass potential relationship was more drastic, which can basically be regarded as a simple superposition of multiple single-pass pulls.

Exploration of novel faying surface treatment for high-strength frictional bolted joints to enhance its after-slip performance

2021 ◽  
Author(s):  
Hitoshi Moriyama ◽  
Ryo Sakura ◽  
Takashi Yamaguchi ◽  
Takai Toshikazu ◽  
Yuta Yamamoto
Keyword(s):  
Surface Treatment ◽  
Load Transfer ◽  
High Strength ◽  
Bolted Joints ◽  
Deformation Capacity ◽  
Slip Coefficient ◽  
Faying Surface ◽  
Treatment Concepts ◽  
Local Slip

<p>Welded joints is adopted rather than bolted joints for megastructure’s connections because the former can carry large force. However, the former has several problems, such as quality control of welding in situ, which the latter can solve. By contrast, as the load transfer ratio of each bolt becomes uneven proportionally to the number of bolts, local slip around extreme bolts occurs before the whole slip. Extreme bolts to which a large shear force is applied will break before other bolts. For utilizing the strength of all bolts, the problem is solved by improving shear deformation capacity in faying surface with novel surface treatment. Here, the treatment concepts were explored, and the coating’s effectiveness was evaluated through friction tests. The deformation capacity can be twice or more than that of conventional treatment, and the slip coefficient doesn’t depend on contact pressure. These features have the advantage to give stable slip behaviour.</p>

Determination of the Creep Deflection of a Rivet in Double Shear

1959 ◽  
Vol 26 (2) ◽  
pp. 285-290
Author(s):  
Joseph Marin
Keyword(s):  
Theoretical Prediction ◽  
Power Plants ◽  
Elevated Temperatures ◽  
Structural Components ◽  
Double Shear ◽  
Riveted Joints ◽  
Simple Tension ◽  
Riveted Joint ◽  
Jet Power

Abstract Structural components of modern aircraft are subjected to elevated temperatures by jet power plants and by skin friction resulting from supersonic speeds. Some of these high-temperature-aircraft structural components are riveted connections. Considerable experimental data are available on the creep of riveted connections used in aircraft [1]. However, a survey of the literature shows a lack of results on the theoretical prediction of creep in riveted connections from the usual creep and creep-rupture data for simple tension. The creep of a riveted joint is dependent on various factors including rivet diameter, rivet lengths, and plate thicknesses. This influence of size means that each particular riveted joint must be tested to obtain the necessary information. A basic approach to the problem is theoretically to predict the creep behavior of riveted joints from creep in simple tension. One of the important parts of the creep deformation of a riveted connection, Fig. 1(a), is the creep of the rivet. This paper deals with an approximate theoretical prediction of the creep deflection in a rivet based upon the creep constants of the material in simple tension.

scholarly journals Experimental Evaluation of the Influence of Aggregate Strength on the Flexural Cracking Behavior of Epoxy Asphalt Mixtures

Materials ◽  
2020 ◽  
Vol 13 (8) ◽  
pp. 1876
Author(s):  
Wei Xu ◽  
Xiaoshu Wei ◽  
Jintao Wei ◽  
Zhengxiong Chen
Keyword(s):  
Asphalt Concrete ◽  
High Strength ◽  
Bending Test ◽  
Steel Bridge ◽  
Test Results ◽  
Cracking Resistance ◽  
Cracking Behavior ◽  
Epoxy Asphalt ◽  
Fracture Area ◽  
Aggregate Strength

The flexural cracking resistance of an asphalt concrete mixture used in a steel bridge deck pavement needs to be higher than that of one used in ordinary pavement. In this study, mechanical experimental tests were used to evaluate the influence of the aggregate strength on the flexural cracking behavior of epoxy asphalt concrete (EAC). The aggregate fracture area of beam cross sections was quantitatively analyzed by digital image processing, and crack propagation in the mixture was analyzed using fracture mechanics theory. The bending test results showed that the EAC containing high-strength aggregates exhibited the highest flexural cracking resistance among all of the aggregate mixtures under the same conditions. The use of high-strength aggregates led to a reduction in the aggregate fracture area, thereby improving the flexural cracking resistance of the mixture. The aggregate strength had a significant influence on the flexural cracking propagation behavior of the mixture. Fatigue test results at strain-controlled levels of 600–1200 με and 15 °C showed that the aggregate strength had no evident influence on the fatigue properties of the EAC. It is recommended that high-strength aggregates are used to increase the fracture resistance of aggregates and the flexural crack resistance of EACs.

EXPERIMENTAL STUDY ON SLIP COEFFICIENT OF HIGH STRENGTH BOLTED JOINT WITH METAL SPRAYED CONTACT SURFACE

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Yusuke Nakanishi ◽  
Kunitaro Hashimoto ◽  
Yasuo Suzuki ◽  
Kunitomo Sugiura
Keyword(s):  
Steel Structures ◽  
High Strength ◽  
Treatment Method ◽  
Construction Cost ◽  
Bolted Joints ◽  
Maintenance Cost ◽  
Bolted Joint ◽  
Slip Coefficient ◽  
Surface Conditions ◽  
Contact Surfaces

There are several ways to reduce the number of bolts of frictional bolted joints from the viewpoint of the construction cost and the maintenance cost for steel structures. For example, there are the ways which are strengthening the material of bolts, or increasing the slip coefficient. This study is focused on the slip coefficient with metal thermal sprayed contact surfaces. The objective of this study is to investigate the effects of different surface conditions on the slip coefficient. Therefore, slip tests were conducted in consideration of 9 patterns of surface treatment method (3 kinds of thickness, 3 kinds of material of sprayed metal).

PROPOSAL OF EVALUATION METHOD FOR RESIDUAL AXIAL FORCE OF CORRODED HIGH-STRENGTH BOLTS

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
M. Tai ◽  
T. Shimozato ◽  
Y. Arizumi ◽  
S. Yamashita ◽  
T. Yabuki
Keyword(s):  
Axial Force ◽  
Strain Gauge ◽  
Evaluation Method ◽  
Force Measurement ◽  
High Strength ◽  
Fe Analysis ◽  
Thickness Reduction ◽  
Steel Bridge ◽  
Core Extraction ◽  
Measurement Of Thickness

In this research an evaluation method for the residual axial force of corroded high-strength bolts was investigated. Corroded high-strength bolts cut from a steel bridge were used for the measurement of thickness reduction and residual axial force. For the residual axial force measurement, a strain-gauge method with a core extraction was applied. An FE analysis examined the effect of the corroded shape of high-strength bolts on the residual axial force. The results reveal that the effect of corroded shapes on the residual axial force can be considered by using the thickness reduction amount near the washer for nut and bolt head. A proposed evaluation method based on the summation of thickness reduction can estimate the residual axial force of corroded high-strength bolts approximately.

Optimal Design Grape Rain Shed Based on CFD and GSCAD

2011 ◽  
Vol 328-330 ◽  
pp. 654-657
Author(s):  
Jian Wang ◽  
Hong Bing Yang
Keyword(s):  
Optimal Design ◽  
Pressure Distribution ◽  
High Strength ◽  
Wind Pressure ◽  
Steel Pipe ◽  
Light Weight ◽  
Force Structure ◽  
Plastic Steel

Plated PE plastic steel pipe has characteristics of high strength, light weight and strong resistance of corrosion and it is very suitable for construction of grape rain shed. The wind pressure distribution of multi-span grape rain shed frame is simulated by CFD software, and the structure of multi-span grape rain shed is optimized in this paper. The force structure of pre-optimal and post-optimal multi-span grape rain shed is analyzed by GSCAD. The study shows that the plated PE plastic steel pipe is suitable for grape rain shed, and the post-optimal multi-span grape has good performance.

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