Extreme Loads on Structures Lab (ELSL)

An interesting experimental study by Jaswanth Gangolu, PhD and Hezi Y. Grisaro, PhD for assessment of the residual axial capacity of damaged columns after being exposed to explosive detonation

Columns are critical structural components, often serving as the most essential members contributing to the overall integrity and stability of buildings. Their primary function lies in their capacity to carry axial loads, making them vital to structural performance. In our previous research, we conducted full-scale experiments coupled and detailed hydrodynamic simulations to predict the response of wide-flange columns subjected to close-in detonations. The experimental data was then used to validate models, forming the basis for a broader parametric study. Our current research focuses on experimentally evaluating the residual axial capacity of these damaged columns after exposure to blast loads - a study that has not been previously explored for this specific configuration. The video demonstrates one of our experiments, where the column buckles and fails. The experimental setup includes various measurement tools, including an advanced image-based tracking point system. The research is led by Jaswanth Gangolu, PhD The technical support of Elhanan Itzhack and Eddi Gershengoren with the experimental setup is gratefully acknowledged. Extreme Loads on Structures Lab (ELSL) NBRI ׂ- National Building Research Institute - Technion, Israel Faculty of Civil & Environmental Engineering Technion

A new paper by Jaswanth Gangolu, PhD and Hezi Y. Grisaro, PhD

Can 3D-printed concrete elements be used as structural members? What are the options for incorporating steel rebar in 3D-printed structural members? Several approaches exist to include reinforcement in concrete-based mixes used for printing. Most of the methods require developing new construction methods, codes, and standards. One of the trivial methods is to print and leave voids for the reinforcement, which will be installed afterward using a special infill grout. The main advantage is that existing standards may be used (at least partially) for this purpose. Many questions are raised by using this method. One of the very basic questions is about the bonding between the rebars and the grout, the grout and the 3D-printed mix, and the actual dimensions that may affect this local behavior.   We study some of the basic questions. We started a testing campaign to measure the bonding stresses between the steel rebar and a 3D-printed element, using installed gauges and tracking point analysis from images. We also test some reference specimens made from commonly used concrete and compared the values with existing codes. The research is done together with Assoc . Prof. Aaron Sprecher and Prof. Arnon Bentur. Thanks to Ola Wattad, Jaswanth Gangolu, PhD, and especially Elhanan Itzhack and Eddi Gershengoren for the technical help with the experimental setup. Extreme Loads on Structures Lab (ELSL) NBRI ׂ- National Building Research Institute - Technion, Israel Faculty of Civil & Environmental Engineering Technion

Recently, we went on our annual trip. It was a great experience to gather most of the ELSL group members together. We also hosted Yona Rubin, who joined our lab for a summer internship, and Yuval, who joined us as an undergraduate student.

🌍 Excited to have participated in #Protect2024 in Singapore! 🇸🇬 During the conference, I presented part of my PhD research on sacrificial claddings for blast protection, focusing on the effects of non-uniform aluminum foams. It was a privilege to share the findings of my work, which explored how these class of materials mitigate peak overpressure from blasts—pushing the boundaries of current protection techniques using simplified tools. The response to my research has been amazing. 🔑 Key highlights: - Discussed a numerical model using shock front theory to predict the dynamic response of non-uniform foam claddings. - Presented pressure-impulse diagrams showing the unprecedented results of the foam’s effect on structural deformations. - Engaged with an international audience and exchanged ideas on advancing blast protection technology. Besides the 12-minute main presentation, I also took part in the #PechaKucha student competition, where I delivered a fast-paced, 5-minute presentation that challenged me to convey complex ideas in a concise and engaging way— what an experience! (got me to appreciate the 12 min) Big thank you to my advisor, Hezi Y. Grisaro, PhD guidance and support. And of course, I couldn’t leave Singapore without exploring its stunning sights! From futuristic architecture to colorful murals, the city truly captured my heart. 💙✨ 📸 Swipe through to see some moments from my presentations and the vibrant streets of Singapore. Jaswanth Gangolu, PhD Extreme Loads on Structures Lab (ELSL) NBRI ׂ- National Building Research Institute - Technion, Israel Technion - Israel Institute of Technology Faculty of Civil & Environmental Engineering Technion #PhDLife #EngineeringInnovation #SingaporeAdventures #YoungResearcher

שמחים וגאים!   ברצוני לברך את המעבדה של Hezi Y. Grisaro, PhD על השתתפותה המוצלחת בכנס PROTECT 2024 בסינגפור.   זוהי הזדמנות נהדרת עבור המעבדה להציג את המחקר פורץ הדרך שלה בפני קהילת החוקרים העולמית בתחום הפיצוצים.   יישר כוח לד"ר גריסרו ולכל צוות המעבדה על ההישג המרשים. https://lnkd.in/dyfhkHRv

I am pleased to attend and participate in PROTECT 2024, where I presented our work on "Parametric Analysis of the Residual Axial Load Capacity of Wide-Flange Steel Columns Subjected to Far-Field Detonations." I want to express my gratitude to my supervisor, Hezi Y. Grisaro, PhD, for his invaluable support and assistance in making my participation in the conference possible. Meeting blast researchers worldwide and engaging in fruitful technical discussions with them was a pleasure. Singapore, of course, is incredible. Ola Wattad Extreme Loads on Structures Lab (ELSL) NBRI ׂ- National Building Research Institute - Technion, Israel Faculty of Civil & Environmental Engineering Technion #blast #steelcolumns #lsdyna #singapore #protect2024

We are in beautiful Singapore for the 9th International Colloquium on Performance, Protection & Strengthening of Structures Under Extreme Loading & Events (PROTECT 2024), organized by Prof. Kang Hai Tan. Three presentations from our group will be presented. My presentation on Linear Protection Layers (LPLs) will be given tomorrow, following a great work done by Eyal Eytam. If you attend the conference and want to meet for a coffee, send me a message. #PROTECT2024 Extreme Loads on Structures Lab (ELSL) NBRI ׂ- National Building Research Institute - Technion, Israel Faculty of Civil & Environmental Engineering Technion