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Applied Sciences
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Seismic Assessment and Retrofit of Steel Structures
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Seismic Assessment and Retrofit of Steel Structures

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Civil Engineering".

Deadline for manuscript submissions: closed (31 October 2023) | Viewed by 9606

Special Issue Editors

Prof. Dr. Pier Paolo Rossi

E-Mail Website
Guest Editor
Department of Civil Engineering and Architecture, University of Catania, 95123 Catania, Italy
Interests: seismic analysis, design, and retrofitting of steel or reinforced concrete buildings; seismic design of bridges; numerical modeling of steel and reinforced concrete members; seismic behavior of in-plan and in-elevation irregular buildings; strength verification/design of reinforced concrete members subjected to combined axial force; bending moment and shear force
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Melina Bosco

E-Mail Website
Guest Editor
Department of Civil Engineering and Architecture, University of Catania, 95123 Catania, Italy
Interests: seismic analysis, design, and retrofitting of steel or reinforced concrete buildings; seismic behavior of in-plan and in-elevation irregular buildings; numerical modeling of steel and reinforced concrete members
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue is open to all kinds of advances and novel applications related to modeling, design, assessment, and retrofit of steel structures in seismic areas. It aims to collect scientific papers of researchers of all over to world that strive to contribute to civil engineering for the safety of people and steel structures in seismic areas.

The main topics of this Special Issue are:

  • New and existing buildings;
  • Industrial buildings;
  • Light-weight structures;
  • Non-structural components;
  • Codification for seismic design, assessment and retrofitting;
  • Cyclic behaviour of members, joints and components;
  • Existing and novel approaches for seismic assessment of structures;
  • Numerical modelling of members or structures;
  • Laboratory tests on components and systems;
  • Advanced methods for retrofit;
  • Loss assessment and risk analysis of existing structures.

Please consider that the above topics are not exhaustive of all aspects of civil engineering of steel structures in seismic areas. So, feel free to submit your contributions on any additional topic that could be relevant to the field of steel structures in seismic areas.

Prof. Dr. Pier Paolo Rossi
Prof. Dr. Melina Bosco
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • steel
  • laboratory tests
  • numerical modelling
  • seismic assessment
  • seismic retrofit

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Published Papers (4 papers)

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Research

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15 pages, 4317 KiB  
Article
Response of Seismically Damaged Steel Reduced Beam Section Joints under Fire
by Roberto Tartaglia, Mario D’Aniello and Raffaele Landolfo
Appl. Sci. 2023, 13(6), 3641; https://doi.org/10.3390/app13063641 - 13 Mar 2023
Cited by 3 | Viewed by 1388
Abstract
The behaviour of seismically damaged steel joints with reduced beam section (RBS) at elevated temperatures has not been widely investigated yet. Therefore, the study summarized in this article aimed to (i) analyse the response of RBS joints at high temperatures and (ii) investigate [...] Read more.
The behaviour of seismically damaged steel joints with reduced beam section (RBS) at elevated temperatures has not been widely investigated yet. Therefore, the study summarized in this article aimed to (i) analyse the response of RBS joints at high temperatures and (ii) investigate the influence of plastic damage, due to cyclic loading, on the fire performance of the joints. A set of RBS joints with rib stiffeners on the both lower and upper beam flanges was designed according to European standards and the following parameters were considered: (i) location of the joint (i.e., internal or external joint) and (ii) reduction in the beam flexural resistance (i.e., 65% or 80% of the beam plastic moment). The mechanical response of these joints was simulated by means of finite element models (FEM). The accuracy and effectiveness of the adopted modelling assumptions to mimic the seismic response of the joints were validated against experimental results available from the existing literature. The numerical results highlight that under cyclic loading, all investigated joints exhibit ductile behaviour, allowing the concentration of the plastic deformation within the reduced segment of the beam. The designed reduction in the beam flexural resistance influences the joint fire performance, being impaired in the cases with lower flexural resistance. In contrast, the imposed cyclic pre-damage does not appreciably affect the fire resistance of the investigated joints. Full article
(This article belongs to the Special Issue Seismic Assessment and Retrofit of Steel Structures)
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24 pages, 8472 KiB  
Article
Seismic Assessment and Structural Retrofitting of the Day-Hospital Building “G. Pascale Foundation”
by Alessandro Pisapia, Vincenzo Piluso, Rosario Montuori, Elide Nastri and Ciro Frattolillo
Appl. Sci. 2023, 13(3), 1663; https://doi.org/10.3390/app13031663 - 28 Jan 2023
Viewed by 1693
Abstract
This work aims to provide an effective structural solution, minimizing the discomfort during the works’ execution, for how to retrofit the Day-Hospital building of the National Cancer Institute “G. Pascale Foundation” in Naples. The structural vulnerability has been preliminarily evaluated for this scope, [...] Read more.
This work aims to provide an effective structural solution, minimizing the discomfort during the works’ execution, for how to retrofit the Day-Hospital building of the National Cancer Institute “G. Pascale Foundation” in Naples. The structural vulnerability has been preliminarily evaluated for this scope, using linear static and dynamic analyses according to code provisions. The performance index in terms of peak ground acceleration (PGA), both for the life safety (SLV) limit state and the operational (SLO) limit state, has been evaluated. A seismic assessment has been performed by finite element (FE) analyses using the SAP2000 computer program, post-processor VIS15 and plugin SPF. Two main solutions have been proposed to improve the structural performance of the existing building. The first one is based on increasing the thickness of the existing reinforced concrete (RC) cores. The second solution is characterized by strengthening the RC cores using steel plates, steel strips and angles. A comparison of the proposed interventions is provided herein from the technological and financial standpoints. Full article
(This article belongs to the Special Issue Seismic Assessment and Retrofit of Steel Structures)
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20 pages, 7587 KiB  
Article
Experimental Study on Bearing Capacity of Compression Members of Space Grid Structures Reinforced by RPC
by Yutong Duan, Honggang Lei, Yan Zhou and Shihong Jin
Appl. Sci. 2022, 12(15), 7809; https://doi.org/10.3390/app12157809 - 3 Aug 2022
Cited by 1 | Viewed by 1461
Abstract
Insufficient bearing capacity of compression bars in space grid structures can significantly reduce the collapse resistance of structures and cause immeasurable losses. Reactive powder concrete (RPC) with high strength, micro-expansion, and good ductility is used to reinforce the compression members of grid structures [...] Read more.
Insufficient bearing capacity of compression bars in space grid structures can significantly reduce the collapse resistance of structures and cause immeasurable losses. Reactive powder concrete (RPC) with high strength, micro-expansion, and good ductility is used to reinforce the compression members of grid structures by infilling steel tubes. Axial compression tests on five types of high-frequency welded pipes with different section sizes and initial stresses were carried out. The results showed that compared to steel tubes alone, the bearing capacity of steel tubes reinforced by RPC could be increased by 75.77 to 218.34%. With a decrease of either the initial stress or confinement coefficient, the contribution of the material reinforcement increased. The failure mode of the specimen after RPC grouting was the same as that of the non-reinforced steel pipe, which was dominated by elastic-plastic buckling. The grouting hole after reinforcement did not fail prior to the instability of the member, which suggests that necessary measures to repair the hole should be taken. Based on the design method of axial compression bearing capacity of concrete-filled steel tubular members in six codes in China and abroad, the test results of this paper and 242 RPC-filled steel tubes were compared and analyzed. Finally, an equation of nominal bearing capacity, which estimates the ultimate bearing capacity of compressive members strengthened by filled RPC in grid structures, was proposed. Full article
(This article belongs to the Special Issue Seismic Assessment and Retrofit of Steel Structures)
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Other

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17 pages, 2900 KiB  
Perspective
Advances and Challenges in Design of Connections in Steel-Braced Frame Systems with In-Plane Buckling Braces
by Dipti Ranjan Sahoo, Pratik Patra and Arvind Kumar Jain
Appl. Sci. 2023, 13(6), 3959; https://doi.org/10.3390/app13063959 - 20 Mar 2023
Cited by 2 | Viewed by 4186
Abstract
A new type of connection has been developed for steel-braced frame systems that allows the brace members to undergo compression buckling in the in-plane direction. In addition to the inherent benefits of in-plane buckling (IPB) braces that help in reducing the extent of [...] Read more.
A new type of connection has been developed for steel-braced frame systems that allows the brace members to undergo compression buckling in the in-plane direction. In addition to the inherent benefits of in-plane buckling (IPB) braces that help in reducing the extent of damage to the non-structural components, the IPB brace system is also considered to be an efficient way of retrofitting existing seismically deficient structures. The use of the compact and thicker gusset plate prevents the distortion of the free edges and the additional torsional force demand on beams and columns. However, IPB braced frame systems are not frequently used in practice, primarily due to the absence of limit state design criteria. As a result, some prominent failure modes observed in IPB frame systems are out-of-plane brace buckling, yielding of gusset plates, interface weld failure, and fracturing of knife plates. Recent studies on the IPB braced system have resolved some of these problems, such as design criteria being developed to prevent OOPB (out-of-plane buckling) of the IPB braced system. Other challenges need to be studied to achieve reliable performance of the braced frame system. This study focuses on recent advances and potential areas of improvement to achieve an efficient IPB braced system in highly seismic areas. Full article
(This article belongs to the Special Issue Seismic Assessment and Retrofit of Steel Structures)
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