Integrated impact failure analysis of concrete slab structures with consideration of impact load characteristics

1994 ◽  
Vol 150 (2-3) ◽  
pp. 295-301 ◽  
Author(s):  
Michael W. King ◽  
Ayaho Miyamoto
Keyword(s):  
Failure Analysis ◽  
Impact Load ◽  
Concrete Slab ◽  
Impact Failure ◽  
Load Characteristics

Impact Failure Analysis of RC Beam Using ASPH Method Based on Damage Theory

2015 ◽  
Vol 784 ◽  
pp. 258-265
Author(s):  
Yoshimi Sonoda
Keyword(s):  
Failure Analysis ◽  
Yield Surface ◽  
Damage Mechanics ◽  
Impact Response ◽  
Dominant Factor ◽  
Surface Model ◽  
Anisotropic Damage ◽  
Rc Beam ◽  
Tensile Crack ◽  
Impact Failure

The aim of this paper is to propose the impact failure analysis of reinforced concrete beam using tensile softening technique based on the damage mechanics. In general, tensile crack is the most dominant factor for concrete and it is not appropriate to evaluate their effect by theory of plasticity. Thus mechanical failure of concrete is considered by not only conventional plastic theory but also damage mechanics. In the analysis to calculate the plastic deformation, Drucker-Prager yield surface model is employed, on the other hand Von-Mises yield surface model is applied for the reinforcing bar. Besides, mechanical influence of tensile crack in the concrete is also considered as the decrease of effective cross-section area using anisotropic damage variable. Several impact tests of RC beam are reviewed and their impact response are simulated by proposed analysis method. As a result, it is confirmed that proposed method can simulate impact response of RC beam and it could predict precise failure condition such as the distribution of concrete crack using anisotropic damage model.

Impact failure analysis of re-circulating mechanism in ball screw

2004 ◽  
Vol 11 (4) ◽  
pp. 561-573 ◽  
Author(s):  
Jui-Pin Hung ◽  
James Shih-Shyn Wu ◽  
Jerry Y. Chiu
Keyword(s):  
Failure Analysis ◽  
Ball Screw ◽  
Impact Failure

scholarly journals BEHAVIOUR OF TERNARY BLENDED CEMENT CONCRETE SLAB WITH STEEL FIBER UNDER IMPACT LOADING

2021 ◽  
pp. 82-94
Author(s):  
Chandrasekaran Vijayvenkatesh ◽  
Reddy Rajupalem Rahul
Keyword(s):  
Crack Resistance ◽  
Impact Loading ◽  
Steel Fiber ◽  
Volume Fraction ◽  
Impact Load ◽  
Concrete Slab ◽  
Blended Cement ◽  
Cement Concrete ◽  
Reinforced Concrete Slabs ◽  
The Impact

Statement of the problem. An experimental investigation of impact strength of ternary blended cement concrete slab with steel fiber under impact loading was carried out. The amount of replacement of binder with Fly ash varies from 10 to 30 % in step of 10 %, glass powder from 20 to 40 % in step of 10 % and fiber volume fraction from 0.75 to 2.25 % in step of 0.75 %. Parametric performance of ten 600 × 600 mm, 60 mm thick reinforced concrete slabs was evaluated. The impact test on the slab was conducted by dropping a steel ball from a height of 457 mm under impact setup. The parameters like failure mode, the impact energy of first crack and ultimate crack failure, ductility index, failure pattern, ultimate crack resistance, crack resistance ratio were investigated when subjected to impact load. Results. The test results reported that the slab specimen S7 shows better performance in strength.

scholarly journals Analysis and Testing of Load Characteristics for Rotary-Percussive Drilling of Lunar Rock Simulant with a Lunar Regolith Coring Bit

2017 ◽  
Vol 2017 ◽  
pp. 1-15 ◽  
Author(s):  
Peng Li ◽  
Hui Zhang ◽  
Shengyuan Jiang ◽  
Weiwei Zhang
Keyword(s):  
Impact Load ◽  
Rotational Velocity ◽  
Lunar Regolith ◽  
Drilling Process ◽  
Percussive Drilling ◽  
Analytic Equation ◽  
Lunar Rock ◽  
Rotary Drilling ◽  
Drilling Parameters ◽  
Load Characteristics

Based on an optimized lunar regolith coring bit (LRCB) configuration, the load characteristics of rotary-percussive drilling of lunar rock simulant in a laboratory environment are analyzed to determine the effects of the drilling parameters (the rotational velocity, the penetration rate, and the percussion frequency) on the drilling load. The process of rotary drilling into lunar rock using an LRCB is modeled as an interaction between an elemental blade and the rock. The rock’s fracture mechanism during different stages of the percussive mechanism is analyzed to create a load forecasting model for the cutting and percussive fracturing of rock using an elemental blade. Finally, a model of the load on the LRCB is obtained from the analytic equation for the bit’s cutting blade distribution; experimental verification of the rotary-impact load characteristics for lunar rock simulant with different parameters is performed. The results show that the penetrations per revolution (PPR) are the primary parameter influencing the drilling load. When the PPR are fixed, increasing the percussion frequency reduces the drilling load on the rock. Additionally, the variation pattern of the drilling load of the bit is in agreement with that predicted by the theoretical model. This provides a research basis for subsequent optimization of the drilling procedure and online recognition of the drilling process.

3D modelling of reinforced concrete slab with yielding supports subject to impact load

2016 ◽  
Vol 21 (7-8) ◽  
pp. 988-1025 ◽  
Author(s):  
A. Kezmane ◽  
B. Chiaia ◽  
O. Kumpyak ◽  
V. Maksimov ◽  
L. Placidi
Keyword(s):  
Reinforced Concrete ◽  
Impact Load ◽  
Concrete Slab ◽  
3D Modelling ◽  
Reinforced Concrete Slab

PENETRATION DEPTH STUDY FROM PREVIOUS EMPIRICAL FORMULA OF MODIFIED FOAMED CONCRETE SLAB UNDER LOW IMPACT LOAD FROM A NON-DEFORMABLE IMPACTOR

2016 ◽  
Vol 78 (5) ◽  
Author(s):  
Josef Hadipramana ◽  
Abdul Aziz Abdul Samad ◽  
Noridah Mohamad ◽  
Shahrul Niza Mokhatar ◽  
Fetra Venny Riza
Keyword(s):  
Compressive Strength ◽  
Impact Loading ◽  
Empirical Formula ◽  
Impact Load ◽  
Concrete Slab ◽  
Experimental Result ◽  
Research Committee ◽  
Depth Study ◽  
Foamed Concrete ◽  
Defense Research

The Modified Foamed Concrete (FC) was acheived by replacing sand with Rice Husk Ash (RHA) and experimental result has shown an increased in the compressive strength compared to conventional FC. This increase in compressive strength is required by FC to withstand impact loading. The experimental parameters from the modified FC subjected to impact loading were incorporated into previous empirical formula's, such as National Defense Research Committee (NDRC) [8], [18]), Ammann & Whitney [8], and Hughes [9] formulas. The calculation showed differences in results due to its variation and multiple approaches of the empirical formula. However, it is noted that the modified FC did not produce much differences with the conventional FC when it is subjected to impact loading. The calculation of previous formulas have indicated and highlighted these findings.     

Failure Behavior of RC Slabs Subjected to Medium Velocity Impact

2016 ◽  
Author(s):  
Masuhiro Beppu ◽  
Shinnosuke Kataoka
Keyword(s):  
Shear Failure ◽  
Impact Load ◽  
Concrete Slab ◽  
Reaction Force ◽  
Plain Concrete ◽  
Concrete Specimen ◽  
Failure Behavior ◽  
Velocity Impact ◽  
Reinforced Concrete Slabs ◽  
The Impact

This study is intended to investigate failure mechanism of plain concrete and reinforced concrete slabs subjected to a medium-velocity impact by conducting impact tests. In a series of tests, a steel projectile with a mass of 8.3kg collided a concrete slab with a thickness of 18cm. In order to examine impact response of the concrete specimen, impact load and reaction force were measured. Test results revealed that the impact velocity corresponding to the scabbing limit was about 40m/s and the failure mode of the concrete specimen subjected to the medium-velocity was similar to the punching shear failure.

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