The effect of stiffeners on the strain patterns of the welded connection zone

Kiamanesh, Roozbeh; Abolmaali, Ali; Ghassemieh, Mehdi

doi:10.1016/j.jcsr.2009.07.010

Cited by 20 publications

(6 citation statements)

References 7 publications

(19 reference statements)

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“…Overall, it has been concluded that connections with both column stiffeners and top-flange stiffeners have the Fig. 15 Typical I-beam to box-column connection (Kiamanesh et al 2010) Encyclopedia of Earthquake Engineering DOI 10.1007/978-3-642-36197-5_207-1 # © Crown 2014 highest value of energy dissipation, while the beam top-flange stiffener is the most effective one, especially when it is incorporated with the column stiffeners of a hollow section.…”

Section: Stiffeners At Connectionsmentioning

confidence: 99%

Strengthening Techniques: Code-Deficient Steel Buildings

Tsavdaridis

2014

Encyclopedia of Earthquake Engineering

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IntroductionThe design of steel buildings is often governed by lateral wind loads and not seismic loads. Also, statistics indicate that the number of fatalities during earthquakes due to failure of all types of steel buildings is significantly less compared to other types of buildings. Consequently, much effort has been invested to seismically retrofit buildings having unreinforced masonry walls and reinforced concrete frames. However, recently steel buildings have received significant attention, while this interest mainly stems from the realization, following the 1994 Northridge earthquake, that the welded beam-to-column connections in moment-resisting frames were likely to fail in a brittle manner, prior the development of significant inelastic response, therefore negating the design intent and possibility causing safety hazards.Recent research has expanded the variety and versatility of the tools available in the structural engineer's toolbox to meet the seismic performance objectives. This entry provides an overview of how this research is expanding the available options for the seismic strengthening of steel buildings, by reporting on some selected research projects.Structural strengthening and proving seismic resistance for steel building, but also masonry and reinforced concrete, may be done by first considering the direction of the weak links in the structures. For instance, for a heavy building with large dead load, this would be the major factor that contributes to the increase of lateral seismic load. Therefore, it is reasonable to first consider reducing the overall existing dead load and then provide the necessary strengthening technique for the lateral load-resisting system of the structure.The use of structural steel in buildings' retrofitting can be often considered economical and efficient because:• Steel buildings are particularly effective under performance-based design.• Steel members exhibit ductile behavior beyond elastic limit, hence dissipate considerable amount of energy before damages occur.• Steel members have higher strength-to-weight and stiffness-to-weight ratios; hence, the buildings attract less base shear under an earthquake.• A better quality control is practiced in the production of the material as well as the fabrication and erection of them, while ensuring results close to the theoretical predictions.*Email: k.tsavdaridis@leeds.ac.ukEncyclopedia of Earthquake Engineering DOI 10.1007/978-3-642-36197-5_207-1 # © Crown 2014Page 1 of 26• Steel can be generally used to retrofit all types of structures without increasing the dead weight dramatically, making the works less intrusive and time consuming. Code-Deficient BuildingsAll buildings can carry their own weight. They can usually carry a bit of snow and a few other floor loads vertically, so even badly built buildings and structures can resist some up-and-down loads. However, buildings and structures are not necessarily resistant to lateral loads, unless this has been taken into account carefully during the structural engin...

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Section: Stiffeners At Connectionsmentioning

confidence: 99%

Strengthening Techniques: Code-Deficient Steel Buildings

Tsavdaridis

2014

Encyclopedia of Earthquake Engineering

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“…The combined hardening plasticity model was used in order to model the material behavior during the cyclic loading. The parameters suggested by Kiamanesh et al [16] and Ghobadi et al [17] for combined strain hardening of Grade-50 hot-rolled steel was selected in the analysis algorithm. Isotropic hardening was used to model the material properties of the high strength steel bolts with material constitutive law as shown in Figure 9.…”

Section: Loading and Materials Modelingmentioning

confidence: 99%

Computational Benchmarks in Simulation of Cyclic Performance of Steel Connections using Three Dimensional Nonlinear Finite Element Method

Razavi¹,

Kiamanesh²,

Abolmaalii³

2012

JSTE

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The presented manuscript is intended to introduce accurate computational benchmarks to predict the hysteresis behavior of beam-column steel connections by means of a 3D non-linear finite element analysis. In this study, element type, inelastic material behavior, bolts pre-tensioning, and contact properties between different components of connections are discussed. Incremental nonlinear analysis takes into account all three types of nonlinearities including material, geometry, and contact properties in predicting moment-rotation hysteresis loops. A series of full-scale structural tests are performed to validate the results obtained from the finite element analyses. This study shows that cost efficient numerical analysis simulation is capable of replacing full-scale tests for steel connections.

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“…In recent years, domestic and foreign scholars [3][4][5][6][7][8][9][10][11] have conducted a lot of research on the structure of steel tube confined concrete column and various joints strengthening measures. In terms of joints, Jianguo Nie proposed the form of steel tube non penetrating ring beam joints, and multiple reinforcement rings are arranged horizontally in the joints area, so that the concrete in the joints area is subject to multiple constraints [7].…”

Section: Introductionmentioning

confidence: 99%

Research on Restoring Force Model of Built-in Steel Tube Reinforced STRC Column Joints

Zhang

Wang

2023

Lecture Notes in Civil Engineering

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In the circular steel tube confined reinforced concrete (STRC) column frame structure, because there is no effective restraint of steel tube in the joints area, it becomes a relatively weak part. Therefore, this paper proposes a STRC column joints with a section of steel tube built in the joints area, and expounds the structural form of the new joints. ABAQUS finite element analysis software is used to simulate the quasi-static test of joints. On the basis of verifying the rationality and reliability of the finite element analysis method, six joints models of build-in steel tube reinforced STRC columns with different lengths are established. Based on the model skeleton curve obtained by simulation analysis, the eigenvalues of each loading stage are fitted to obtain the skeleton curve model regression equation and stiffness degradation law. The three fold restoring force model of steel tube STRC column joints with different lengths is established. The skeleton curves of restoring force model and finite element calculation results are compared and analyzed to verify the correctness of restoring force model. The results show that the restoring force model is in good agreement with the finite element analysis results. The established restoring force model can provide a reference for the elastic-plastic change and seismic analysis of build-in steel tube reinforced STRC column joints.

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The effect of stiffeners on the strain patterns of the welded connection zone

Cited by 20 publications

References 7 publications

Strengthening Techniques: Code-Deficient Steel Buildings

Strengthening Techniques: Code-Deficient Steel Buildings

Computational Benchmarks in Simulation of Cyclic Performance of Steel Connections using Three Dimensional Nonlinear Finite Element Method

Research on Restoring Force Model of Built-in Steel Tube Reinforced STRC Column Joints

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