49 research outputs found
Blast response and vulnerability assessment of piled foundations
No full textThis research treated the response of pile foundations to blast loads. The influence of important parameters was investigated. The research techniques and the results will enable safer design of pile foundations that are vulnerable to blast loads
Computer simulation of underground blast response of pile in saturated soil
No full textThis paper treats the blast response of a pile foundation in saturated sand using explicit nonlinear finite element analysis, considering complex material behavior of soil and soil–pile interaction. Blast wave propagation in the soil is studied and the horizontal deformation of pile and effective stresses in the pile are presented. Results indicate that the upper part of the pile to be vulnerable and the pile response decays with distance from the explosive. The findings of this research provide valuable information on the effects of underground explosions on pile foundation and will guide future development, validation and application of computer models
Blast induced ground shock effects on pile foundations
No full textDue to increased number of terrorist attacks in recent years, loads induced by explosions need to be incorporated in building designs. For safer performance of a structure, its foundation should have sufficient strength and stability. Therefore, prior to any reconstruction or rehabilitation of a building subjected to blast, it is important to examine adverse effects on the foundation caused by blast induced ground shocks. This paper evaluates the effects of a buried explosion on a pile foundation. It treats the dynamic response of the pile in saturated sand, using explicit dynamic nonlinear finite element software LS-DYNA. The blast induced wave propagation in the soil and the horizontal deformation of pile are presented and the results are discussed. Further, a parametric study is carried out to evaluate the effect of varying the explosive shape on the pile response. This information can be used to evaluate the vulnerability of piled foundations to credible blast events as well as develop guidance for their design
Effect of soil properties on the response of pile to underground explosion
No full textThis paper develops and presents a fully coupled non-linear finite element procedure to treat the response of piles to ground shocks induced by underground explosions. The Arbitrary Lagrange Euler coupling formulation with proper state material parameters and equations are used in the study. Pile responses in four different soil types, viz, saturated soil, partially saturated soil and loose and dense dry soils are investigated and the results compared. Numerical results are validated by comparing with those from a standard design manual. Blast wave propagation in soils, horizontal pile deformations and damages in the pile are presented. The pile damage presented through plastic strain diagrams will enable the vulnerability assessment of the piles under the blast scenarios considered. The numerical results indicate that the blast performance of the piles embedded in saturated soil and loose dry soil are more severe than those in piles embedded in partially saturated soil and dense dry soil. Present findings should serve as a benchmark reference for future analysis and design
Development of a BIM-Based Web Tool as a Material and Component Bank for a Sustainable Construction Industry
Get PDFpeer reviewedThe construction industry consumes an enormous amount of global resources and produces
more waste than any other sector. The need to move toward sustainable development in construction requires significant changes in construction and demolition (C&D) waste management. The estimation of waste, recycling materials and reusable components could be vital in waste management, achieving huge efficiency in the construction industry. Moreover, a typical building comprises of an extensive amount of materials and components with various characteristics. This study proposes a Building Information Modelling (BIM)-based system to allow the circular economy by storing information of the materials and components of buildings and by effectively managing the recycling of materials and reuse of components. A tool which serves as a Material and Component (M&C) bank was developed with PHP and MYSQL by making use of a web browser able to extract the materials and component information of a building through the BIM model. This information is vital for several uses such as quantification of C&D waste and assessing for the design for deconstruction. It can also be used to obtain the information of the reusable condition of the components and instructions for the reconstruction.ECON4SD (Eco-Construction for Sustainable Development
Bioavailability of Iron, Calcium and Zinc in Supplementary Food Formulations
No full textThis Dissertation / Report is the outcome of investigation carried out by the creator(s) / author(s) at the department/division of Central Food Technological Research Institute (CFTRI), Mysore mentioned below in this page
Blast response and failure analysis of pile foundations subjected to surface explosion
No full textThis paper presents the response of pile foundations to ground shocks induced by surface explosion using fully coupled and non-linear dynamic computer simulation techniques together with different material models for the explosive, air, soil and pile. It uses the Arbitrary Lagrange Euler coupling formulation with proper state material parameters and equations. Blast wave propagation in soil, horizontal pile deformation and pile damage are presented to facilitate failure evaluation of piles. Effects of end restraint of pile head and the number and spacing of piles within a group on their blast response and potential failure are investigated. The techniques developed and applied in this paper and its findings provide valuable information on the blast response and failure evaluation of piles and will provide guidance in their future analysis and design
Blast response of reinforced concrete pile using fully coupled computer simulation techniques
No full textPile foundations transfer loads from superstructures to stronger sub soil. Their strength and stability can hence affect structural safety. This paper treats the response of reinforced concrete pile in saturated sand to a buried explosion. Fully coupled computer simulation techniques are used together with five different material models. Influence of reinforcement on pile response is investigated and important safety parameters of horizontal deformations and tensile stresses in the pile are evaluated. Results indicate that adequate longitudinal reinforcement and proper detailing of transverse reinforcement can reduce pile damage. Present findings can serve as a benchmark reference for future analysis and design
Eco-construction for sustainable development: Concept of a Material and Component Bank
Get PDFpeer reviewedThe European Commission has recently promulgated the concept of Circular Economy as a new pathway towards sustainability, in
particular through new policy initiatives such as the Circular Economy Action Plan (CEAP). Since the environmental impact of the
construction industry with the depletion of natural resources and the raising CO2 emissions will have to be reduced in the future, the
need of recycling and even reusing entire building components supporting the principles of circular economy have been identified. The
direct reuse of components extracted from old deconstructed buildings presents an energy-efficient and environmental-friendly solution.
However, the reuse of components can be hindered by e.g. the lack of information on the availability of decommissioned structural
components and uncertainties on the warranty of structural components. To handle this process an additional independent institution
acting as Material and Component (M&C) Bank is needed. This entity assures activities such as e.g. the identification of reusable
components in buildings which are proposed for selective dismantling; the condition assessment; the data management and the data
transfer from a previously deconstructed building to a new building; and finally, an official certification of the components’ conformity
for another service life in a new application. In the current paper, a concept for such a M&C bank is presented. This study investigates
the potential of a M&C bank in the framework of circular economy concepts for the planning of sustainable and circular buildings with
a reduced eco-footprint by focusing on the reuse of decommissioned structural components. The concept, main businesses and work
operation of the bank are discussed. Furthermore, a digital representation of the bank as BIM-based M&C bank needed to publicize the
availability of the reusable components to the market and to enable circular business models by showing their circular pathways are
described.ECON4S
Experimental and Numerical Investigation of a Novel Demountable Timber–Concrete Composite Floor
No full textIn recent years, there has been an increasing interest in timber–concrete composite (TCC) floors as a sustainable structural solution. Until now, only a few studies have investigated the demounting of TCC floors, which is essential to increase sustainability and improve the end-of-life environmental benefits of a floor system. This study investigates an innovative and straightforward demountable TCC slab that has notched and bolted connections. Six downscaled slabs are tested under four-point bending. The results show that the slab system has high composite action with an efficiency of 0.73. A three-dimensional finite element model is developed and calibrated with the experimental result. The model is used to study the influence of several parameters, such as the shape and dimensions of the notch as well as the bolt location on the load-bearing capacity and the load-deflection behavior of the slab. The results show that the failure tends to be more ductile when a birdsmouth-shaped notch is used, and the bolt is placed within the notch. Moreover, the load-bearing capacity of the shear connection increases by increasing the distance of the notch to the end of the slab and using a triangular notch
