Results 31 to 40 of about 943 (198)

Flexure shear capacity of prestressed hollow core slabs

Revista IBRACON de Estruturas e Materiais, 2021
: Provided that the anchorage capacity is guaranteed at the supports, the bearing capacity of hollow core slabs depends on the shear capacity of the pretensioned concrete webs, wherein the critical section is in a region between h and 2h from the support.
Bruna Catoia, Arthur Lima Rocha, Marcelo de Araújo Ferreira   +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

Impact spectra for eccentrically prestressed beam of bending-stretching effect under moving load

Resilient Cities and Structures
In this study, the impact behavior of an eccentrically prestressed simply-supported concrete beam of prophase bending-stretching retention subjected to a constant moving load is investigated for structure impact resilience evaluation.
Md Mahathe Hasan Toha, Zhi Sun, Chuhan Fan, Jianglin Xu   +3 more
doaj   +1 more source

Shear behavior of concrete beams externally prestressed with Parafil ropes

Ain Shams Engineering Journal, 2013
Although extensive work has been carried out investigating the use of external prestressing system for flexural strengthening, a few studies regarding the shear behavior of externally prestressed beams can be found.
A.H. Ghallab, M.A. Khafaga, M.F. Farouk, A. Essawy   +3 more
doaj   +1 more source

Design and Experimental Assessment of a Prestressed Lead Damper with Straight Shaft for Seismic Protection of Structures

Geosciences, 2022
This study introduces a new energy dissipation device with a high damping capacity for the seismic protection of buildings. The device exploits the friction losses between a movable shaft and a lead core to dissipate the seismic energy and takes ...
Virginio Quaglini, Carlo Pettorruso, Eleonora Bruschi   +2 more
doaj   +1 more source

Effect of Prestress Force on Natural Bending Frequency of External Prestressed Steel Beams [PDF]

The Open Civil Engineering Journal, 2018
Introduction: Natural bending frequencies of externally prestressed steel beam have certain sensitivity to prestress force, so they can be used to find the magnitude of prestress force. Methods: To answer the question if the existence of ...
Tang Bai-jian, Wang Fei, Chen Song
openaire   +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

3D‐Printing Aided Rapid Prototyping of Pretensioned Tensegrity Structures for Robotic Applications

Advanced Robotics Research, EarlyView.
Printing, injection molding, and assembly (PMA) is a method for rapid prototyping mesoscale, topologically complex, and tensioned tensegrity structures. In combination with PMA method, two mold design strategies: modular mold and compact channel layout, enable efficiency and scalability for tensegrity fabrication.
Yi Sun, Jan Petrš, Omar Aloui, Dario Floreano   +3 more
wiley   +1 more source

Friction Characteristics of Post-Tensioned Tendons of Full-Scale Structures Based on Site Tests

Advances in Civil Engineering, 2020
In the design of prestressing concrete structures, the friction characteristics between strands and channels have an important influence on the distribution of prestressing force, which can be considered comprehensively by curvature and swing friction ...
Haoyun Yuan, Yuan Li, Bin Zhou, Shuanhai He, Peizhi Wang   +4 more
doaj   +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