Nicla Lamarucciola’s Post

🔔 2007 Pisco Earthquake in Peru Recorded at Ica Station 140% Base Isolated Configuration Test at NEES on April 2012 #structuralengineering #earthquakeengineering #civilengineering #mechanicalengineering #seismicdesign #structure #damper #structuralanalysis #engineering #vibrationcontrol #isolator #vibration #dynamic #seismic #nonlinear #response #isolation #controlsystems

How much cracking does an instrumented reinforced concrete structure need to experience during an earthquake before its ultimate strength and other nonlinear properties become detectable?...the answer might surprise you! Kalil Erazo and I addressed this interesting question in a recent paper published by the Journal of Earthquake Engineering and Structural Dynamics. Check it out...

🔔 The Role of Seismic Isolation Bearings in Reducing Earthquake Damages in Buildings 💡 A seismic engineering method known as 'base isolation' allowed a Japanese hospital to survive a massive quake without even a broken window. Base isolation is a seismic retrofitting technique used in building construction to minimize earthquake damage. It involves placing a building on flexible bearings or isolators, typically made of rubber or sliding materials, situated between the structure and its foundation. These isolators decouple the building from ground motion during an earthquake, allowing the base to move independently of the superstructure. In the event of seismic activity, the base isolators absorb and dissipate seismic energy, reducing the transmission of forces to the building. This innovative system enhances a structure's ability to withstand earthquakes, protecting occupants and minimizing structural damage. This system can reduce the deformations of the structure by up to 80% in the event of a severe earthquake. #structuralengineering #earthquakeengineering #civilengineering #mechanicalengineering #seismicdesign #structure #damper #structuralanalysis #engineering #vibrationcontrol #isolator #vibration #dynamic #seismic #nonlinear #isolation #controlsystems #earthquakes #damage #retrofitting #protection #japan

Base isolation is a seismic protection technique used in building foundations to reduce the impact of earthquakes. Here’s a brief synopsis: Purpose: Base isolation aims to decouple a building from ground motion during an earthquake, minimizing structural damage. Mechanism: It involves placing flexible bearings or pads between the building and its foundation. These bearings can be made of rubber, lead, or other materials that allow horizontal movement while maintaining vertical support12. Components:Isolation Units: These are the primary elements that provide the decoupling effect. They can include shear or sliding units. Isolation Components: These connect the isolation units but do not contribute to the decoupling effect themselves1. Benefits: By allowing the building to move independently of the ground, base isolation significantly reduces the energy transferred to the structure, thereby reducing deformation and potential damage23. Applications: This technique is used in both new constructions and retrofitting existing buildings. Notable examples include the Utah State Capitol and various city halls in the U.S. It’s also used to protect essential equipment and even artworks14. Base isolation is a crucial tool in earthquake engineering, enhancing the resilience and sustainability of buildings in seismic zones. #baseisolation #Engineering Video Source : Youtube

Learning from structural damage following strong earthquakes has been instrumental in advancing the knowledge and practices of structural design and assessment.   Typically, our understanding of how structural components behave in an earthquake is based on lab studies of individual structural elements. However, it's not until the "real-life" experiment of a design-level earthquake that we get practical insights into the performance of our designed structures.   In this data paper, we - Ken Elwood, Michael Olsen, Max Stephens, and Lucas Hogan - present a detailed damage investigation of an instrumented modern reinforced concrete building that experienced a design-level earthquake. The discussed dataset is considered one of the most complete datasets publicly available.   One of the primary motivations for this work was to provide detailed damage data to address a number of objectives primarily relevant to the seismic performance of precast prestressed hollow-core floor slab units supported by ductile reinforced concrete moment frames.   You can access the article here for free: https://lnkd.in/gnJM6xHE   You can find the dataset here: https://lnkd.in/gYtWz_vf

If you want study the absolute clear concepts on Seismic design of Steel structural design, you may please consider reading this "Facts for steel building number 3 - Earthquakes and Seismic design" by Ronald O. Hamberger American institute for steel construction (AISC). This 70-page book is not mere a code of standards, it is an excellent explanatory guide which explains right from the basics of seismology by explaining some geological concepts to seismic design considerations to trends & research in earthquake design of structures. Click to download for free: https://lnkd.in/ghnEUw6F Highlightable take-way from this explanatory are as follows: ONE: Basics of seismology - which explains causes, principal effects and how does an earthquake affect the buildings TWO: Basic seismic concepts with respect to structures - dynamic properties, response spectrum, inelastic response and ductility concepts. THREE: Design criteria for steel structures - From site class properties to design categories, drift limits to capacity design, when should AISC 341 to be considered for design and when R values shall be taken as 3? are well explained. FOUR: Frames - Braced frames and Moment resisting frames & its seismically special frames are explained in detail. So engineer can precisely choose which system could be applicable for relevant seismic situation after reading this. FIVE: Case studies of past earthquakes - Importance and lessons of site soil, framing systems are evident in the performance of the buildings during the earthquakes are elaborated. The above explanatory might be full of U.S. code of standards. But the core concepts could be applicable to Indian or any other scenarios. Hope this post was informative, follow PRASANNA S for more. Thanks for your support.

Reflecting on Japan's recent earthquakes, valuable lessons have emerged from this catastrophic event. While Japan adheres to robust earthquake design standards, there's a clear need for enhanced infrastructure resilience to effectively face severe seismic events. I've delved into this by authoring a paper on the seismic behaviors of long-span bridges supported on deep foundations in both liquefiable and non-liquefiable soil conditions. My exploration revealed that piles stand out as the most fragile component in both non-liquefiable and liquefiable conditions. Additionally, the reinforced concrete pier displayed a significant drift response in non-liquefiable soil, rendering it more susceptible to seismic hazards compared to liquefiable soil. These findings underscore the imperative for further research and industrial practical measures to fortify infrastructure resilience, ensuring safer communities in the face of seismic challenges. Lets connect and chat more! #SeismicBehaviors #InfrastructureResilience #EarthquakeDesign #DeepFoundations #SeismicHazards #ResearchInsights #JapanEarthquakes #StructuralSafety

In a many techniques of S.A. of structure. Analysis of the structure is critical techniques for structural S.A. in general evaluate structural reaction is non linear in nature. This type of analysis, a representative earthquake time history is required. In this case study S.A. of RCC buildings with mass irregularity at different floor level are carrying. Seismic forces can origin major structural damage or demolition. In multi story RC building have been subjected to the heavy earth quakes, the existence of irregularity in RC construction was vertical irregularity of the building stap 0nds it apart from other structures. In this study is to design and analysis of the structural elements like Slabs, Beams and Columns etc. All loads like dead load, live load, wind load etc. are consider according to standards and by considering seismic and wind force to ensure the safety and careful balance b w financial system and safety. As a final point the analysis parameters like shear force, bending moment and displacements are comparatively presented. by Magal Banskar | Prof. Pawan Dubey | Prof. Rakesh Sakale | Prof. Hirendra Pratap Singh "A Study on Seismic Analysis of High Rise Building with Mass Irregularities, Torsional Irregularities and Floating Column" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-8 | Issue-2 , April 2024, URL: https://lnkd.in/gHfqN46P Paper Url: https://lnkd.in/g6ZDfM3Y

I am thrilled to share that our paper titled "Performance-based optimum seismic design of self-centering steel moment frames with SMA-based connections" has been published in Earthquake Engineering & Structural Dynamics! Shape memory alloys (SMAs) have found several applications in earthquake-resilient structures. However, because of high material costs, their implementation on industry projects is still limited. This paper presents a performance-based optimization method for the seismic design of high-performance cost-effective self-centering steel moment frames (SC-MRFs) with SMA bolted endplate connections. With the goal of reducing the total cost (including the initial and repair costs), the optimal placement and properties of the SMA connections, as well as the cross-sections of the beams and columns, are determined. The optimal SC-MRFs are then assessed in terms of cost and seismic performance. The results confirm the effectiveness of the proposed optimum design, which minimizes the use of SMAs while ensuring improved seismic performance. The paper is available for open access through the following link: https://lnkd.in/gzViEjDP I am deeply grateful to my supervisor, Prof. Saber Moradi, for his unwavering support. I would also like to extend special thanks to Prof. Henry V Burton from UCLA for his invaluable contribution to this work.   #seismicdesign #performancebaseddesign #optimization

🔔 The Role of Seismic Isolation Bearings in Reducing Earthquake Damages in Buildings 💡 Base isolation is a seismic retrofitting technique used in building construction to minimize earthquake damage. It involves placing a building on flexible bearings or isolators, typically made of rubber or sliding materials, situated between the structure and its foundation. These isolators decouple the building from ground motion during an earthquake, allowing the base to move independently of the superstructure. In the event of seismic activity, the base isolators absorb and dissipate seismic energy, reducing the transmission of forces to the building. This innovative system enhances a structure's ability to withstand earthquakes, protecting occupants and minimizing structural damage. #structuralengineering #earthquakeengineering #civilengineering #mechanicalengineering #seismicdesign #structure #damper #structuralanalysis #engineering #vibrationcontrol #isolator #vibration #dynamic #seismic #nonlinear #response #isolation #controlsystems