scholarly journals A NUMERICAL ANALYSIS ON FLAT-SHAPED RC BEAMS UNDER FALLING-WEIGHT IMPACT LOADING

2018 ◽  
Author(s):  
DANDAN ZHENG ◽  
TOMOKI KAWARAI ◽  
NORIMITSU KISHI ◽  
MASATO KOMURO
Keyword(s):  
Numerical Analysis ◽  
Impact Loading ◽  
Rc Beams ◽  
Weight Impact ◽  
Falling Weight

Numerical Simulation of Impact Response Behavior of Rectangular Reinforced Concrete Slabs under Falling-Weight Impact Loading

2011 ◽  
Vol 82 ◽  
pp. 266-271 ◽  
Author(s):  
Norimitsu Kishi ◽  
Yusuke Kurihashi ◽  
Sara Ghadimi Khasraghy ◽  
Hiroshi Mikami
Keyword(s):  
Reinforced Concrete ◽  
Numerical Analysis ◽  
Impact Loading ◽  
Dynamic Responses ◽  
Concrete Slabs ◽  
Analysis Method ◽  
Numerical Analysis Method ◽  
Reinforced Concrete Slabs ◽  
Weight Impact ◽  
Falling Weight

A numerical analysis method for rectangular reinforced concrete slabs under falling-weight impact loading is established. The proposed method using finite element analysis incor-porates a simple constitutive model for concrete elements. The applicability was investigatedcomparing the numerical results with the experimental data. Falling-weight impact tests wereconducted on reinforced concrete slabs with different supporting conditions. These were: a slabwith line supports on four sides; a slab with two line supports on two opposite sides (the othertwo sides were free); and a slab with one line and two corner-point supports. Following resultswere obtained from this study: (1) the time histories of dynamic responses are well predictedby using proposed numerical analysis method; (2) maximum reaction forces and the maximumdeflections in the slab center below the loading point, and characteristics of the damped freevibration after falling weight was rebounded, can be better predicted; and (3) major crackpatterns can be roughly predicted despite of support conditions.

scholarly journals Influence Factors Analysis of RC Beams under Falling Weight Impact Based on HJC Model

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
Xiaohong Long ◽  
Ahmed Turgun ◽  
Rong Yue ◽  
Yongtao Ma ◽  
Hui Luo
Keyword(s):  
Finite Element ◽  
Impact Load ◽  
Influence Factors ◽  
Response Analysis ◽  
Impact Loads ◽  
Rc Beams ◽  
Element Analysis ◽  
Structure Component ◽  
Weight Impact ◽  
Falling Weight

Impact loads may cause serious or even fatal damage to the structure (component), in most existing specifications in China, and there are no special terms that take impact load into consideration. So, the response analysis of the structure (component) under impact loads is very important. In this paper, the sensitivity analysis was conducted for the 22 parameters of the Holmquist–Johnson concrete (HJC) constitutive model of concrete, and the sensitive parameters of the HJC model are identified with A, B, G, Pl, μl, and fc respectively. LS-DYNA nonlinear transient finite element analysis code was used for this paper. Based on the validation of finite element modeling and choosing midspan deflection of RC beams and impact loads as response indices, some influencing factors on RC beams under falling weight impact were investigated, such as the mass and speed of falling weight, impact position, the strength of concrete and rebar, longitudinal reinforcement ratio, and the span of the beam.

Numerical study for impact resistant design of full scale arch type reinforced concrete structures under falling weight impact test

2011 ◽  
Vol 18 (9) ◽  
pp. 1275-1283 ◽  
Author(s):  
Abdul Qadir Bhatti ◽  
Shameem Khatoon ◽  
Aamir Mehmood ◽  
Abid Dastgir ◽  
Norimitsu Kishi
Keyword(s):  
Reinforced Concrete ◽  
Numerical Analysis ◽  
Impact Test ◽  
Design Procedure ◽  
Full Scale ◽  
Analysis Method ◽  
Rc Structures ◽  
Weight Impact ◽  
Current Impact ◽  
Falling Weight

In this paper, a falling-weight impact test using full scale arch type reinforced concrete (RC) structures was conducted to verify a proposed impact response analysis method. The applicability of the numerical analysis method was confirmed by comparison with the experimental results. The validity of the current impact resistant design procedure to the performance based design procedure was investigated using the proposed numerical analysis method. From this study, it is confirmed that by applying the current impact resistant design procedure, a performance based impact resistant design with a sufficient safety margin may be obtained for the full scale arch type RC structures.

Impact Resistant Behavior of RC Beam Damaged by Freeze-Thaw Action

2016 ◽  
Vol 711 ◽  
pp. 745-750
Author(s):  
Yusuke Kurihashi ◽  
Maki Mizuta ◽  
Akinori Shimata ◽  
Norimitsu Kishi
Keyword(s):  
Compressive Strength ◽  
Elastic Modulus ◽  
Frost Damage ◽  
Rc Beam ◽  
Input Energy ◽  
Rc Beams ◽  
Freeze Thaw ◽  
Weight Impact ◽  
Falling Weight ◽  
The Impact

In this study, in order to investigate the impact resistant behavior of RC beams damaged by freeze-thaw action, falling-weight impact tests for RC beams were conducted taking with/without frost damage as variable. The RC beam used in this study has been damaged by accelerated freeze-thaw cycling. From this experiment, following results were obtained: 1) Elastic modulus and compressive strength of the concrete were decreased due to freeze-thaw action; 2) In the case of damaged beam, many fine cracks were occurred in small input energy; and 3) Deflections of damaged beam was larger than that of non-damaged beam at the same weight-falling height.

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