Results 21 to 30 of about 381 (175)

Cyclic Behavior of Bolted Stiffened End-Plate Moment Connections for Different Bolt Pretensioning Levels: An Experimental Study

Shock and Vibration, 2023
Bolted stiffened end-plate moment connections are one of the most usable connections used as a prequalified connection in special steel moment frames. According to the AISC design code, this connection can be considered one of the most important parts of
Hamed Noferesti, Mohsen Gerami
doaj   +1 more source

Seismic Behavior Improvement of Rigid Steel Frame Braced with Cable and Optimal Rotational Friction Damper

Buildings
The research focused on enhancing the seismic performance of steel moment frames using cable braces and a central friction damper. By optimizing the design and pretensioning force of the cable braces, this study aimed to improve the energy absorption and
Pouya Azarsa, Saleh Abdul Amir Mohammad, Abdullah I. Almansour, Dejian Shen   +3 more
doaj   +1 more source

Pretensioned BFRP reinforced concrete beams: Flexural behaviour and estimation of initial prestress losses [PDF]

MATEC Web of Conferences, 2019
Fibre Reinforced Polymers (FRP) are becoming a popular reinforcement option for RC elements mainly due to good strength to weight ratio and resistance to corrosion.
Pavlović Ana, Donchev Ted, Petkova Diana, Limbachiya Mukesh, Almuhaisen Refad   +4 more
doaj   +1 more source

Feasibility of up-tower repair concepts for pultruded carbon spar cap planks in wind turbine blades [PDF]

Wind Energy Science
While modern wind turbine blades utilize pultruded carbon-fiber-reinforced polymer (CFRP) planks for structural integrity in spar caps, these materials can sustain damage from operational stresses, leading to potential failures if unaddressed ...
M. Rosemeier, M. Saathoff, J. Kolsch, P. Buriticá, E. Petersen, C. Beer   +5 more
doaj   +1 more source

Numerical Study of the Influence of the Interaction Distance, the Polymeric Strips Pre-Tensioning, and the Soil–Polymeric Interaction on the Performance of Back-to-Back Reinforced Soil Walls

Infrastructures, 2022
This study describes the results of a series of 2D finite element method (FEM) numerical models of 6 m high back-to-back reinforced soil walls using the geotechnical software PLAXIS. These structures are used to support embankments, especially for bridge
Abdelaziz Brouthen, Mohamed Nabil Houhou, Ivan Puig Damians   +2 more
doaj   +1 more source

Collision‐Resilient Winged Drones Enabled by Tensegrity Structures

Advanced Robotics Research, EarlyView.
Based on structures of birds such as the woodpeck, this article presents the collision‐resilient aerial robot, SWIFT. SWIFT leverages tensegrity structures in the fuselage and wings which allow it to undergo large deformations in a crash, without sustaining damage. Experiments show that SWIFT can reduce impact forces by 70% over conventional structures.
Omar Aloui, Raphael Zufferey, William Stewart, Mohammad Askari, Simon Jeger, Dario Floreano   +5 more
wiley   +1 more source

Effect of pre-tensioning force on behavior of Buckling Restrained Brace (BRB) supported by double pre-tensioning system

Fracture and Structural Integrity
The study explores the feasibility of a new all-steel buckling restrained brace (BRB) with the double pre-tensioning system as an alternative to conventional concentrically braced frames by using finite element method (ABAQUS program), And to verify ...
Mohamed Selim, Muhammad E. Kamel, Eman Elshamy, Mohamed Emara   +3 more
doaj   +1 more source

Evaluation of Prestress Loss Distribution during Pre-Tensioning and Post-Tensioning Using Long-Gauge Fiber Bragg Grating Sensors

Sensors, 2018
Prestress loss evaluation in prestressed strands is essential for prestressed structures. However, the sensors installed outside the duct can only measure the total prestress loss.
Sheng Shen, Yao Wang, Sheng-Lan Ma, Di Huang, Zhi-Hong Wu, Xiao Guo   +5 more
doaj   +1 more source

Continuum Mechanics Modeling of Flexible Spring Joints in Surgical Robots

Advanced Robotics Research, EarlyView.
A new mechanical model of a tendon‐actuated helical extension spring joint in surgical robots is built using Cosserat rod theory. The model can implicitly handle the unknown contacts between adjacent coils and numerically predict spring shapes from straight to significantly bent under actuation forces.
Botian Sun, Liang Zhang, Jianwen Zeng, Xuefeng Wang   +3 more
wiley   +1 more source

A Soft Robotic Fish With a Dielectric Elastomer Actuator Body and Negative Stiffness Spine

Advanced Robotics Research, EarlyView.
This work introduces a bio‐mimetic soft robotic fish driven by fiber‐reinforced dielectric elastomer actuators integrated as its body. By prestretching this active skin against a flexible spine, a negative stiffness system is created, enabling large‐amplitude bending.
Markus Koenigsdorff, Simon Holzer, Stefania Konstantinidi, Yoan Civet, Yves Perriard   +4 more
wiley   +1 more source