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Author: Andac Lulec Publisher: ISBN: Category : Languages : en Pages :
Book Description
The analysis of reinforced and prestressed concrete elements under blast and impact loading is drawing the interest of many researchers due to increasing number of natural or human-made hazards that require attention. The analysis methods used are mainly based on either simplified single degree-of-freedom methods or highly sophisticated and complex hydrocodes. Although single degree-of-freedom methods are commonly used by designers for practical reasons, they are incapable of providing detailed results such as deformed shapes and crack maps. Additionally, since they require simplification of the structure to a single degree-of-freedom system, they are difficult to apply to complex geometries. On the other hand, hydrocodes overcome the limitations associated with the simplification of the structure. However, they require highly detailed models which require significantly increased modelling and computational time. Moreover, the accuracy of blast and impact analyses with hydrocodes heavily relies on the material input parameters which are not commonly known. Thus, there remains a need for accurate, simplified and reliable tools for analysis of reinforced and prestressed concrete subjected to blast and impact loading. The VecTor family of nonlinear finite element programs, using a macro-element smeared rotating crack approach, has been shown to be accurate in predicting the response of shear-critical structures under quasi-static conditions. In this study, two members of this suite, VecTor3 and VecTor6, were adapted for the blast and impact analyses of reinforced and prestressed concrete structures in 3D and axisymmetric conditions, respectively. The results obtained from the simulations were close to those experimentally observed. Additionally, a semi-analytical formula for the prediction of perforation velocity from missile impact was developed. The formula, which is based on the Modified Compression Field Theory, considers the influence of longitudinal and shear reinforcement in the target differently from other commonly used empirical formulae. The formula was validated with numerous missile impact data available in the literature, and good accuracy was found.
Author: Andac Lulec Publisher: ISBN: Category : Languages : en Pages :
Book Description
The analysis of reinforced and prestressed concrete elements under blast and impact loading is drawing the interest of many researchers due to increasing number of natural or human-made hazards that require attention. The analysis methods used are mainly based on either simplified single degree-of-freedom methods or highly sophisticated and complex hydrocodes. Although single degree-of-freedom methods are commonly used by designers for practical reasons, they are incapable of providing detailed results such as deformed shapes and crack maps. Additionally, since they require simplification of the structure to a single degree-of-freedom system, they are difficult to apply to complex geometries. On the other hand, hydrocodes overcome the limitations associated with the simplification of the structure. However, they require highly detailed models which require significantly increased modelling and computational time. Moreover, the accuracy of blast and impact analyses with hydrocodes heavily relies on the material input parameters which are not commonly known. Thus, there remains a need for accurate, simplified and reliable tools for analysis of reinforced and prestressed concrete subjected to blast and impact loading. The VecTor family of nonlinear finite element programs, using a macro-element smeared rotating crack approach, has been shown to be accurate in predicting the response of shear-critical structures under quasi-static conditions. In this study, two members of this suite, VecTor3 and VecTor6, were adapted for the blast and impact analyses of reinforced and prestressed concrete structures in 3D and axisymmetric conditions, respectively. The results obtained from the simulations were close to those experimentally observed. Additionally, a semi-analytical formula for the prediction of perforation velocity from missile impact was developed. The formula, which is based on the Modified Compression Field Theory, considers the influence of longitudinal and shear reinforcement in the target differently from other commonly used empirical formulae. The formula was validated with numerous missile impact data available in the literature, and good accuracy was found.
Book Description
Original research on performance of materials under a wide variety of blasts, impacts, severe loading and fireCritical information for protecting buildings and civil infrastructure against human attack, deterioration and natural disastersTest and design data for new types of concrete, steel and FRP materials This technical book is devoted to the empirical and theoretical analysis of how structures and the materials constituting them perform under the extreme conditions of explosions, fire, and impact. Each of the 119 fully refereed presentations is published here for the first time and was selected because of its original contribution to the science and engineering of how materials, bridges, buildings, tunnels and their components, such as beams and pre-stressed parts, respond to potentially destructive forces. Emphasis is placed on translating empirical data to design recommendations for strengthening structures, including strategies for fire and earthquake protection as well as blast mitigation. Technical details are provided on the development and behavior of new resistant materials, including reinforcements, especially for concrete, steel and their composites.
Author: Publisher: ISBN: Category : Languages : en Pages : 10
Book Description
Yield line theory offers a simplified nonlinear analytical method that can determine the ultimate bending capacity of flat reinforced concrete planes subject to distributed and concentrated loads. Alternately, yield line theory, combined with hinge rotation limits can determine the energy absorption capacity of plates subject to impulsive and impact loads. This method is especially useful in evaluating existing structures that cannot be qualified using conservative simplifying analytical assumptions. Typical components analyzed by yield line theory are basements, floor and roof slabs subject to vertical loads along with walls subject to out of plant wall loads. One limitation of yield line theory is that it is difficult to evaluate some mechanisms; this is aggravated by the complex geometry and reinforcing layouts commonly found in practice. A yield line evaluation methodology is proposed to solve computationally tedious yield line mechanisms. This methodology is implemented in a small PC based computer program that allows the engineer to quickly evaluate multiple yield line mechanisms.
Author: Jitesh Kumar Reddy Nalagotla Publisher: ISBN: Category : Blast effect Languages : en Pages : 93
Book Description
Reinforced concrete slab systems are widely used in protective structures designed to resist blast events. Blast events subject structures to high pressure and impulse loads. The magnitude of blast load experienced by a structural element is directly related to the exposed area. Hence protection of reinforced concrete slabs and walls, which constitute the maximum exposed area of a structure when subjected to blast loads, is of great importance. The main purpose of the project is to study the non-linear response of reinforced concrete slabs when subjected to impact and blast loading. Blast loading comprises of impulsive, dynamic and quasi-static loading conditions. And the performance of reinforced concrete slabs subjected to these loads is highly dependent upon the reinforcing steel provided in the slab. Hence a comprehensive analysis is performed on a representative slab panel with varying reinforcement. Due to the nature of the blast loading analysis method used influences the slab response significantly. Hence the slab response was predicted and compared using finite element (FE) and single degree of freedom (SDOF) methods. An advanced finite element modeling tool, LSDYNA and a commonly used SDOF analysis tool, SBEDS are employed for the purpose of analysis. A parametric analysis is conducted to develop Pressure-Impulse (PI) curves for different damage levels. Curve fit analysis was performed to characterize the PI curves generated from FE method. Conclusions and future work recommendations are presented for design of reinforced concrete slabs for blast protection based upon the research are presented and discussed.abstract.
Author: George Deodatis Publisher: CRC Press ISBN: 1315884887 Category : Technology & Engineering Languages : en Pages : 1112
Book Description
Safety, Reliability, Risk and Life-Cycle Performance of Structures and Infrastructures contains the plenary lectures and papers presented at the 11th International Conference on STRUCTURAL SAFETY AND RELIABILITY (ICOSSAR2013, New York, NY, USA, 16-20 June 2013), and covers major aspects of safety, reliability, risk and life-cycle performance of str
Author: Mudar Hamsho Publisher: Grin Publishing ISBN: 9783668233942 Category : Languages : en Pages : 106
Book Description
Project Report from the year 2015 in the subject Engineering - Civil Engineering, grade: 1.3 (90-100%), Dresden Technical University, language: English, abstract: In the frame of a research program at the TU Dresden, reinforced concrete slabs are tested in a drop-tower. The goal is to obtain a model with which the prediction of the structural behav-ior of the slabs under high loading rates, depending on different parameters. The global behavior response of RC slabs (symmetric reinforcement without shear stirrups) due to a hard impact projectile and a strain rate 10-1 [1/s] has been addressed in this project-work. A complex drop-mass apparatus is used to conduct experiments and investigations on the impact dynamic behavior of RC slabs The focus was on the response stage of the linear elastic field and how to correlate this re-sponse stage to the drop-height depending on raw experimental data. A process of data analysis for hundreds, thousands, or millions of data measurements has been carried out and an analytical model based on a system of single degree of freedom and different simplifications is shown with different verification methods. The model enables predicting bending response due to impact. The test of 11 slabs with drop-heights (1 to 4 meters) provides the required data to calibrate the analytical model as well as future numerical models.
Author: Holm Altenbach Publisher: Springer ISBN: 9783662557709 Category : Science Languages : en Pages : 0
Book Description
This Encyclopedia covers the entire science of continuum mechanics including the mechanics of materials and fluids. The encyclopedia comprises mathematical definitions for continuum mechanical modeling, fundamental physical concepts, mechanical modeling methodology, numerical approaches and many fundamental applications. The modelling and analytical techniques are powerful tools in mechanical civil and areospsace engineering, plus in related fields of plasticity, viscoelasticity and rheology. Tensor-based and reference-frame-independent, continuum mechanics has recently found applications in geophysics and materials.
Author: Andac Lulec
Author: Andac Lulec
Author: Heather Trommels
Author: Venkatesh K.R. Kodur
Author: 
Author: Andrew J. Deeks
Author: Jitesh Kumar Reddy Nalagotla
Author: 
Author: George Deodatis
Author: Mudar Hamsho
Author: Holm Altenbach