Results 21 to 30 of about 340 (173)

Numerical Modeling of Post-Tensioned Concrete Flat Slabs with Unbonded Tendons in Fire

Engineering Proceedings
The structural fire of post-tensioned concrete flat slabs with unbonded tendons has not been well investigated so far. An investigation based on experimental results was conducted in this study using a numerical model.
Ya Wei, Daoan Fan, Francis T. K. Au
doaj   +1 more source

Effect of Prestress Levels and Jacking Methods on Friction Losses in Curved Prestressed Tendons

Applied Sciences, 2017
The effects of prestressing methods and prestress levels on the friction losses of prestressed tendons were evaluated in this study. Two full-scale prestressed concrete girders were fabricated and used for the friction loss experiment.
Sungnam Hong
doaj   +1 more source

Corrosion and Strength Behaviors in Prestressed Tendon under Various Tensile Stress and Impressed Current Conditions

Advances in Materials Science and Engineering, 2017
Corrosion occurs more rapidly under high tensile stress and this leads to several problems like degradation of serviceability and structural performance in PSC (prestressed concrete) structures. In this paper, impressed current method, so-called ICM, was
Bang-Yeon Lee, K. T. Koh, M. A. Ismail, H. S. Ryu, S. J. Kwon   +4 more
doaj   +1 more source

Analysis of Pretensioned Partially Prestressed Concrete Beams

Iraqi Journal of Civil Engineering, 2010
Deflection of partially prestressed concrete beams is investigated using the finite element method, taking into account steel plasticity, nonlinear concrete in compression, and tension softening of concrete.
M. A. Al-Jurmaa, Ayad A. Abdul-Razzak
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

Compliant Pneumatic Feet with Real‐Time Stiffness Adaptation for Humanoid Locomotion

Advanced Robotics Research, EarlyView.
A compliant pneumatic foot with real‐time variable stiffness enables humanoid robots to adapt to changing terrains. Using onboard vision and pressure control, the foot modulates stiffness within each gait cycle, reducing impact forces and improving balance. The design, cast in soft silicone with embedded air chambers and Kevlar wrapping, offers durable,
Irene Frizza, Hiroshi Kaminaga, Philippe Fraisse, Gentiane Venture   +3 more
wiley   +1 more source

Protection and Strengthening of Corroded Prestressing Tendons

Journal of Physics: Conference Series, 2021
AbstractAs of late, structural deterioration of RC structures affected by corrosion is widely reported. A new evolution in maintenance of RC structures is by cathodic protection by the use of carbon fiber reinforced polymers (CFRP). Using steel bar as a cathode and wrapping of CFRP as anode, which prevents removal of concrete cover and blocks further ...
Kaushal Sharma, Yaman Hooda, Preeti Kuhar, Neeraj Kumar Verma   +3 more
openaire   +1 more source

Characterization and Selection of Contractile Actuators for Soft Robotics Operating in the Quasistatic Regime

Advanced Intelligent Systems, EarlyView.
We developed methods to characterize soft contractile actuators using force–displacement measurements in the passive state and the total force in the active state and define the operational range of thermal, electrothermal, and pneumatic muscles. A graphical method enables the selection of an actuator based on the required mechanical force–displacement
Qiong Wang, Liuyang Cheng, Jeongmin Kim, Samuel Tsai, Devin Roach, Sameh Tawfick   +5 more
wiley   +1 more source

Estimation of Degradation in Load Carrying Capacity of Corroded PSC I-Girder

International Journal of Concrete Structures and Materials
Assessing the structural health of aging bridges is crucial for determining their suitability for continued use or upgrades. This study investigates a typical prestressed concrete (PSC) I-girder bridge through experimental and numerical analyses ...
Pengru Deng, Deepti Sharma, Takashi Matsumoto   +2 more
doaj   +1 more source

Analytical Study about the Behavior of Prestressed Composite Steel Beams [PDF]

Kirkuk Journal of Science, 2010
prestressing is the deliberate creation of permanent internal stresses in a structure or a system in order to improve it’s performance under service loads. Such stresses are designed to counter act those induced by external loading.
Saad F. Salih Miged
doaj   +1 more source