Numerical analysis of axially loaded RC columns subjected to the combination of impact and blast loads

2020 ◽  
Vol 219 ◽  
pp. 110924 ◽  
Author(s):  
Gholamreza Gholipour ◽  
Chunwei Zhang ◽  
Asma Alsadat Mousavi
Keyword(s):  
Numerical Analysis ◽  
Blast Loads ◽  
Rc Columns ◽  
Axially Loaded

Numerical analysis of the shear strength of circular reinforced concrete columns subjected to cyclic lateral loads using linear genetic programming

2020 ◽  
Vol 37 (7) ◽  
pp. 2517-2537
Author(s):  
Mostafa Rezvani Sharif ◽  
Seyed Mohammad Reza Sadri Tabaei Zavareh
Keyword(s):  
Numerical Modeling ◽  
Shear Strength ◽  
Reinforced Concrete ◽  
Numerical Analysis ◽  
Genetic Programming ◽  
Linear Genetic Programming ◽  
Rc Columns ◽  
Content Type ◽  
Alternative Approach ◽  
Engineering Problems

Purpose The shear strength of reinforced concrete (RC) columns under cyclic lateral loading is a crucial concern, particularly, in the seismic design of RC structures. Considering the costly procedure of testing methods for measuring the real value of the shear strength factor and the existence of several parameters impacting the system behavior, numerical modeling techniques have been very much appreciated by engineers and researchers. This study aims to propose a new model for estimation of the shear strength of cyclically loaded circular RC columns through a robust computational intelligence approach, namely, linear genetic programming (LGP). Design/methodology/approach LGP is a data-driven self-adaptive algorithm recently used for classification, pattern recognition and numerical modeling of engineering problems. A reliable database consisting of 64 experimental data is collected for the development of shear strength LGP models here. The obtained models are evaluated from both engineering and accuracy perspectives by means of several indicators and supplementary studies and the optimal model is presented for further purposes. Additionally, the capability of LGP is examined to be used as an alternative approach for the numerical analysis of engineering problems. Findings A new predictive model is proposed for the estimation of the shear strength of cyclically loaded circular RC columns using the LGP approach. To demonstrate the capability of the proposed model, the analysis results are compared to those obtained by some well-known models recommended in the existing literature. The results confirm the potential of the LGP approach for numerical analysis of engineering problems in addition to the fact that the obtained LGP model outperforms existing models in estimation and predictability. Originality/value This paper mainly represents the capability of the LGP approach as a robust alternative approach among existing analytical and numerical methods for modeling and analysis of relevant engineering approximation and estimation problems. The authors are confident that the shear strength model proposed can be used for design and pre-design aims. The authors also declare that they have no conflict of interest.

Empirical Formulae To Predict Pressure And Impulsive Asymptotes For P–I Diagrams Of RC Columns Strengthened With FRP

2011 ◽  
Author(s):  
A. A. Mutalib ◽  
Norhisham Bakhary
Keyword(s):  
Concrete Strength ◽  
Numerical Results ◽  
Fiber Reinforced Polymer ◽  
Blast Loads ◽  
Fiber Reinforced ◽  
Rc Columns ◽  
Pressure Impulse ◽  
Reinforced Polymer ◽  
Blast Response ◽  
Parametric Studies

Kajian terhadap keupayaan struktur dalam menahan beban letupan menggunakan Fiber Reinforced Polymer (FRP) adalah sangat terhad. Dalam kajian ini, satu analisis terhadap keupayaan FRP bagi menahan beban letupan dilakukan. Tujuan analisis ini adalah untuk memperolehi hubungan antara kekuatan FRP, bilangan lapisan ketebalan FRP dan susunatur FRP bagi menahan kekuatan sesuatu beban letupan. Kajian ini dilakukan mengunakan model tiang diperkukuh dengan FRP yang dibina menggunakan perisian LS–DYNA. Ia melibatkan beberapa siri simulasi untuk meramalkan tindakbalas letupan dan kerosakkan pada tiang sekiranya sesuatu beban letupan dikenakan. Melalui simulasi ini, kekuatan FRP, bilangan lapisan ketebalan FRP dan susunatur FRP dapat ditentukan. melalui keputusan–keputusan yang diperolehi, pressure–impulse diagram (P–I) bagi tiang yang diperkukuhkan dengan FRP dapat dibentuk. Kata kunci: Pengukuhan; beban letupan; FRP; P–I diagrams There are only limited studies that directly correlate the increase in structural capacities in resisting the blast loads with the fiber reinforced polymer (FRP) strengthenin. In this paper, numerical analyses of dynamic response and damage of reinforced concrete (RC) columns strengthened with FRP to blast loads are carried out using the commercial software LS–DYNA. A series of simulations are performed to predict the blast response and damage of columns with different FRP type. The simulations also involved parametric studies by varying the FRP thickness, configuration, different column dimension, concrete strength, and longitudinal and transverse reinforcement ratio. The numerical results are used to develop pressure–impulse (P–I) diagrams of FRP strengthened RC columns. Based on the numerical results, the empirical formulae are derived to calculate the pressure and impulse asymptotes of the P–I diagrams of RC columns strengthened with FRP. Key words: Strengthening; blast loads; FRP; P–I diagrams

Generation of pressure–impulse diagrams for failure modes of RC columns subjected to blast loads

2019 ◽  
Vol 100 ◽  
pp. 520-535 ◽  
Author(s):  
Runqing Yu ◽  
Li Chen ◽  
Qin Fang ◽  
Haichun Yan ◽  
Guoliang Chen
Keyword(s):  
Failure Modes ◽  
Blast Loads ◽  
Rc Columns ◽  
Pressure Impulse

scholarly journals Numerical Analysis of RC Columns Accompanied with Friction Damping Mechanism under Cyclic Loading

2017 ◽  
Vol 171 ◽  
pp. 821-835 ◽  
Author(s):  
Angga Fajar Setiawan ◽  
Yoshikazu Takahashi ◽  
Junji Kiyono ◽  
Sumio Sawada
Keyword(s):  
Numerical Analysis ◽  
Cyclic Loading ◽  
Friction Damping ◽  
Rc Columns

scholarly journals Prediction of Damage Level of Slab-Column Joints under Blast Load

2020 ◽  
Vol 10 (17) ◽  
pp. 5837
Author(s):  
Kwang Mo Lim ◽  
Do Guen Yoo ◽  
Bo Yeon Lee ◽  
Joo Ha Lee
Keyword(s):  
Numerical Analysis ◽  
Prediction Equation ◽  
General Purpose ◽  
Blast Loads ◽  
Joint Region ◽  
Element Analysis ◽  
Scaled Distance ◽  
Damage Level ◽  
Disturbed Zone ◽  
Column Joint

The behavior of a slab-column joint subjected to blast loads was studied by numerical analysis using a general-purpose finite element analysis program, LS-DYNA. Under the explosive load, the joint region known as the stress disturbed zone was defined as a region with a scaled distance of 0.1 m/kg1/3 or less through comparison with ConWep’s empirical formula. Displacement and support rotation according to Trinitrotoluene (TNT) weight and scaled distance were investigated by dividing in and out of the joint region. In addition, fracture volume was newly proposed as an evaluation factor for blast-resistant performance, and it was confirmed that the degree of damage to a member due to blast loads was well represented by the fracture volume. Finally, a prediction equation for the blast-resistant performance of the slab-column joint was proposed, and the reliability and accuracy of the equation were verified through additional numerical analysis.

Numerical Investigation of a Masonry Column Reinforced by the Helical Reinforcement

2014 ◽  
Vol 923 ◽  
pp. 225-228 ◽  
Author(s):  
Marek Jašek ◽  
Lucie Mynarzová ◽  
Jan Hurta ◽  
Jiri Brozovsky
Keyword(s):  
Numerical Analysis ◽  
Numerical Investigation ◽  
Civil Engineering ◽  
Advanced Materials ◽  
Masonry Structures ◽  
Axially Loaded ◽  
New Buildings ◽  
Visual Changes

In recent years numerous advanced materials technologies have appeared in the market or have been developed for use in construction. In civil engineering there are also numerous fields of application for these materials, which can be used for construction of new buildings as well as for reparation and improvement of older structures. In many cases the helical reinforcement is used for the improvement and rehabilitation of masonry structures. This type of reinforcement offers several advantages. It requires only minimal changes of the existing masonry elements and it introduces no visual changes of the rehabilitated structure. In the paper a numerical analysis and an assessment are presented of such a helical reinforcement for the improvement of axially loaded masonry columns.

Experimental study of beam-column joints in axially loaded RC columns strengthened by steel angles and strips

2008 ◽  
Vol 8 (4) ◽  
pp. 329-342 ◽  
Author(s):  
Jose M. Adam ◽  
Ester Gimenez ◽  
Pedro A. Calderon ◽  
Francisco J. Pallares ◽  
Salvador Ivorra
Keyword(s):  
Experimental Study ◽  
Rc Columns ◽  
Steel Angles ◽  
Axially Loaded
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