FULL-SIZE BENDING TEST AND ANALYSIS OF SQUARE STEEL PIPES WITH BOLTED JOINTS FOR UNDERPASS CONSTRUCTION METHOD

2016 ◽  
Vol 72 (1) ◽  
pp. 39-52
Author(s):  
Tomoya NAKAMURA ◽  
Yota TOGASHI ◽  
Kiwamu TSUNO ◽  
Noriyuki OKANO ◽  
Yukinori KOYAMA
Keyword(s):  
Construction Method ◽  
Bolted Joints ◽  
Bending Test ◽  
Full Size ◽  
Steel Pipes

scholarly journals FULL-SIZE BENDING TEST OF PLYWOOD BOX BEAM WITH TENSILE JOINT OF FLANGE BASED ON POST-AND-BEAM CONSTRUCTION

2015 ◽  
Vol 21 (48) ◽  
pp. 585-590
Author(s):  
Motoko MURAKAMI ◽  
Hiroshi FUKUYAMA ◽  
Haruo KITAMURA ◽  
Koji HARADA ◽  
Kei SUZUKI ◽  
...  
Keyword(s):  
Bending Test ◽  
Full Size ◽  
Box Beam

On the Critical Boundary Conditions for Rupture of Buckled Steel Pipelines

2017 ◽  
Author(s):  
Nima Mohajer Rahbari ◽  
J. J. Roger Cheng ◽  
Samer Adeeb
Keyword(s):  
Boundary Conditions ◽  
Equivalent Plastic Strain ◽  
Operating Mode ◽  
Bending Test ◽  
Loading Path ◽  
Fe Model ◽  
Line Pipe ◽  
Steel Pipes ◽  
Critical Boundary ◽  
Soil Pipe

The environmental contamination due to the leakage of energy pipelines is a serious hazard to the public property and safety. Hence, any premature rupture should be dealt with in the design and the operating mode of steel pipes. A large amount of complexity is involved in the soil-pipe interactions that makes it so challenging to discover the physical boundary conditions (BC) applied to the buried pipelines during differential ground movements. Therefore, the most critical boundary conditions of buried pipes should be conceived based on the probable mechanism of soil-pipe interactions and considered in the experimental and analytical simulations of rupture. The focus of the current research is to address the critical boundary conditions that can trigger the rupture of underground wrinkled pipelines whilst being subjected to a monotonic increase of curvature. Finite element (FE) simulation of a full-scale bending test on a pressurized X70 line pipe specimen conducted at the University of Alberta is implemented. Cumulative fracture criterion coupled with the equivalent plastic strain to fracture for X70 steel grade is fed into the analysis to predict the ductile crack formation in the pipe’s body. The FE model is verified by the experimental data and is used to study the critical soil-pipe interactions that provoke the rupture of buckled steel pipes on the tensile side of the cross-section under increasing bending curvature. The results of this study suggest that the pipelines which are restricted from axial displacements are extremely vulnerable to experience a rupture along their post-buckling loading path. And so are the pipelines in which tensile axial force is developed due to soil-pipe interactions, e.g. pipelines in arctic regions that are installed during the summer time.

A Study on Experimental Evaluation for Fracture Behavior of Carbon Steel Pipes for High Pressure Service with Local Wall Thinning

2007 ◽  
Vol 345-346 ◽  
pp. 1349-1352 ◽  
Author(s):  
Seok Hwan Ahn ◽  
Kum Cheol Seok ◽  
Ki Woo Nam
Keyword(s):  
Carbon Steel ◽  
Nuclear Power ◽  
Failure Modes ◽  
Bending Test ◽  
Metal Loss ◽  
Test Results ◽  
Steel Pipes ◽  
Four Point Bending ◽  
Wall Thinning ◽  
Local Wall Thinning

The locally wall thinned phenomenon of pipes is simulated as metal loss due to erosion/corrosion. Therefore, fracture behaviors of pipes with local wall thinning are very important for the integrity of nuclear power plant. In this study, monotonic bending tests without internal pressure are conducted on 1.91-inch diameter Schedule 80 STS370 full-scale carbon steel pipe specimens. We investigated fracture strengths and failure modes of locally wall thinned pipes that welded and unwelded by four point bending test. From test results, we could be divided three types of failure modes.

scholarly journals Behavior of Steel Branch Connections during Fatigue Loading

2017 ◽  
Vol 62 (3) ◽  
pp. 1597-1601 ◽  
Author(s):  
A. Sládek ◽  
M. Patek ◽  
M. Mičian
Keyword(s):  
Fatigue Behavior ◽  
Bending Moment ◽  
Fatigue Loading ◽  
Bending Test ◽  
Stress And Strain ◽  
High Agreement ◽  
Steel Pipes ◽  
Low Alloyed Steel ◽  
Displacement Transducers ◽  
Stress And Strain Distribution

AbstractFatigue behavior of the branch connection made of low-alloyed steel with yield stress of 355 MPa during low-cycle bending test is investigated in the article. Numerical prediction of the stress and strain distribution are described and experimentally verified by fatigue test of the branch connection sample. Experimental verification is based on low-cycle bending testing of the steel pipes welded by manual metal arc process and loaded by external force in the appropriate distance. Stresses and displacement of the samples induced by bending moment were measured by unidirectional strain gauges and displacement transducers. Samples were loaded in different testing levels according to required stress for 2.106 cycles. Increase of the stress value was applied until the crack formation and growth was observed. Results showed a high agreement of numerical and experimental results of stress and displacement.

Bending test of a composite steel-timber beam jointed by bolts

2019 ◽  
Author(s):  
Masanori Fujita ◽  
Mayo Ohtaki ◽  
Mamoru Iwata
Keyword(s):  
Design Method ◽  
Steel Structures ◽  
Bolted Joints ◽  
Bending Test ◽  
Timber Beam ◽  
Control Member ◽  
Floor Structure ◽  
Controlled Structure ◽  
Story Building ◽  
Composite Steel

<p>In light of global environment issues, the authors proposed a building system comprising steel and timber structure (Hereafter referred to as CSTS), which consist of rolled-H section steel and timber. The CSTS is assumed to adapt for mid-rise story building steel structures. It is a design method of the CSTS that uses the concept of a damage-controlled structure characterized by using buckling-restrained braces as a seismic response control member. It is assumed to use materials such as a cross laminated timber(CLT) for floor structure of the CSTS. The hysteresis model of the CSTS is established based on the available experimental data. Assuming practicality, bending test of the composite steel-timber beam members jointed by bolts is conducted. Behaviour of the composite steel-timber beam members affected by different intervals of bolted joints is evaluated.</p>

Tendencies of export and import of steel industry products of Russia within 9 months of 2019

2020 ◽  
Vol 76 (2) ◽  
pp. 107-112
Author(s):  
N. G. Zinov’eva
Keyword(s):  
Middle East ◽  
Steel Industry ◽  
Pig Iron ◽  
Finished Steel ◽  
Steel Pipes ◽  
Ferrous Metals ◽  
Steel Grades ◽  
Cis Countries ◽  
Further Development ◽  
Coated Sheet

Structure of the Russian export and import of steel industry products presented by results of 9 months of 2019 operation. It was shown, that the total share of pig iron, ferroalloys and semi-products (40.3%) in the ferrous metals export from Russia is practically the same as the share of rolled products and steel pipes (39.4%), whereas the shares in the import structure were 7.7 and 75% accordingly. The share the far abroad countries in the Russian export and import of finished steel products (in natural terms) accounted for 80.6 and 28.7% accordingly, while the share of CIS countries – 19.4 and 71.3% accordingly. For 9 months of 2019 the Russian export of semi-products declined by 10.9% comparing with the analogue period of 2018 and accounted for 10.9 m tons. 54.6% of the total export shipping of semi-products were directed to Mexico, Turkey, Egypt and Taiwan. Within the nearest years the Russian export of semi-products and billets, in particular, will be effected by the further development of the semi-products production in in the countries of Middle East, Turkey, Vietnam and India. The domestic market remained to be more attractive for many Russian companies. For the 9 months of 2019, export of long and flat products accounted for 3 and 5.7 m tons accordingly, declining comparing with the analogue period of the previous year by 11 and 15.6% accordingly. Import of long and flat products decreased by 12 and 0.5%, accounting for 1.0 and 2.9 m tons accordingly. By the results of 9 months of 2019, import declined and export shipping of coated sheet increased. Taking into account the expansion of steel grades assortment by Russian plants, increase of capacities for production of sheet with different coatings, this tendency is likely to remain.

Failure Analysis Of Buried Gas Pipelines Crossing Seismic Faults

2020 ◽  
Vol 3 (2) ◽  
pp. 781-790
Author(s):  
M. Rizwan Akram ◽  
Ali Yesilyurt ◽  
A.Can. Zulfikar ◽  
F. Göktepe
Keyword(s):  
Ground Deformation ◽  
Warning System ◽  
Strike Slip ◽  
Gas Pipelines ◽  
Steel Pipes ◽  
Seismic Fault ◽  
Fault Parameters ◽  
Dip Angle ◽  
Permanent Ground Deformation ◽  
Recent Earthquakes

Research on buried gas pipelines (BGPs) has taken an important consideration due to their failures in recent earthquakes. In permanent ground deformation (PGD) hazards, seismic faults are considered as one of the major causes of BGPs failure due to accumulation of impermissible tensile strains. In current research, four steel pipes such as X-42, X-52, X-60, and X-70 grades crossing through strike-slip, normal and reverse seismic faults have been investigated. Firstly, failure of BGPs due to change in soil-pipe parameters have been analyzed. Later, effects of seismic fault parameters such as change in dip angle and angle between pipe and fault plane are evaluated. Additionally, effects due to changing pipe class levels are also examined. The results of current study reveal that BGPs can resist until earthquake moment magnitude of 7.0 but fails above this limit under the assumed geotechnical properties of current study. In addition, strike-slip fault can trigger early damage in BGPs than normal and reverse faults. In the last stage, an early warning system is proposed based on the current procedure.&amp;nbsp;

Representation of bolted joints in a structure using finite element modelling and model updating

2020 ◽  
Vol 14 (3) ◽  
pp. 7141-7151 ◽  
Author(s):  
R. Omar ◽  
M. N. Abdul Rani ◽  
M. A. Yunus
Keyword(s):  
Finite Element ◽  
Dynamic Behaviour ◽  
Model Updating ◽  
Complex Structure ◽  
Bolted Joints ◽  
Model Parameters ◽  
Fe Model ◽  
Bolted Joint ◽  
Fe Modelling ◽  
Joint Structure

Efficient and accurate finite element (FE) modelling of bolted joints is essential for increasing confidence in the investigation of structural vibrations. However, modelling of bolted joints for the investigation is often found to be very challenging. This paper proposes an appropriate FE representation of bolted joints for the prediction of the dynamic behaviour of a bolted joint structure. Two different FE models of the bolted joint structure with two different FE element connectors, which are CBEAM and CBUSH, representing the bolted joints are developed. Modal updating is used to correlate the two FE models with the experimental model. The dynamic behaviour of the two FE models is compared with experimental modal analysis to evaluate and determine the most appropriate FE model of the bolted joint structure. The comparison reveals that the CBUSH element connectors based FE model has a greater capability in representing the bolted joints with 86 percent accuracy and greater efficiency in updating the model parameters. The proposed modelling technique will be useful in the modelling of a complex structure with a large number of bolted joints.

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