Deflection of reinforced concrete beam under low-velocity impact loads

2021 ◽  
Vol 154 ◽  
pp. 103878
Author(s):  
Yongjae Yu ◽  
Sangho Lee ◽  
Jae-Yeol Cho
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Low Velocity Impact ◽  
Impact Loads ◽  
Low Velocity ◽  
Velocity Impact

Recommendations for Designing Reinforced Concrete Beams Against Low Velocity Impact Loads

2018 ◽  
Vol 18 (09) ◽  
pp. 1850104 ◽  
Author(s):  
Piyapong Wongmatar ◽  
Chayanon Hansapinyo ◽  
Vanissorn Vimonsatit ◽  
Wensu Chen
Keyword(s):  
Reinforced Concrete ◽  
Impact Load ◽  
Reaction Force ◽  
Reinforced Concrete Beams ◽  
Low Velocity Impact ◽  
Inertia Force ◽  
Impact Loads ◽  
Rc Beams ◽  
Low Velocity ◽  
Velocity Impact

This study investigates the behaviors of simply supported reinforced concrete (RC) beams subjected to impact loads. A numerical model of RC beams has been calibrated and a total of 18 RC beams with varying longitudinal reinforcement, transverse shear reinforcement, span and effective depth are investigated, subjected to different input impact energy. It is found that inertia force plays an important role in resisting an impact load at the starting time. The slenderness of the beam can cause increased downward reaction force and also amplifies the upward reaction force. Based on the numerical results, recommendations are made for designing RC beams under low velocity impact load. A formula is derived to predict the maximum mid-span deflection under low velocity impact load with respect to the kinetic energy and static bending capacity. The maximum spacing and the diameter of stirrups are also recommended so as to avoid the brittle failure under impact load.

Study on Response of Reinforced Concrete Beam under Accidental Impact by Piece Part Model

2011 ◽  
Vol 99-100 ◽  
pp. 293-299
Author(s):  
De Rong Wang ◽  
Shu Fang Feng ◽  
Hao Lu
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Contact Region ◽  
Local Deformation ◽  
Low Velocity Impact ◽  
Inertia Force ◽  
Reinforced Concrete Structure ◽  
Low Velocity ◽  
Velocity Impact ◽  
Part Model

At present, there exist many simple and reliable methods to describe the damage degree of reinforced concrete structure induced by low velocity impact. However, the actual fracture process can not be well reflected by the current methods. Therefore, a piece part model, which can well describe the damage process, was put forward. The cracks generated in the concrete beam can be reflected by the interfaces between the elements. In this method, the beam is descretized as the linking system of the steel bar and concrete. The dynamic calculating equation of the beam is deduced on the basis of the internal force and inertia force of the rigid unit and linking piece. The local deformation in the contact region of the beam and the stress-strain state of the beam under low velocity impact can also be calculated by this method. Finally, the advantages of the model were proved by a practice example.

Impact Energy for the First Crack of Reinforced Concrete with Partial Replacements of Sand by Fine Crumb Rubber

2013 ◽  
Vol 701 ◽  
pp. 286-290 ◽  
Author(s):  
Mustafa Maher Al-Tayeb ◽  
B.H. Abu Bakar ◽  
Hanafi Ismail ◽  
Hazizan Md Akil
Keyword(s):  
Reinforced Concrete ◽  
Impact Energy ◽  
Impact Loading ◽  
Crumb Rubber ◽  
Low Velocity Impact ◽  
Moist Air ◽  
Low Velocity ◽  
Velocity Impact ◽  
The Impact

Effects of partial replacements of sand by waste fine crumb rubber on the performance of reinforced concrete under low velocity impact loading were investigated. Specimens were prepared for 5%, 10% and 20 % replacements by volume of sand. All specimens were cured in moist air for 90 days. For each case, six beams of 100 mm ×100 mm × 500mm were subjected to 5.15 kg hammer from 900mm height. The number of blows of the hammer required to induce the first visible crack of the beam were recorded. The results are presented in terms of impact energy required for the first crack. The fine crumb rubbers increased the impact energy for first crack.

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