CHARACTERIZATION OF PRE-EXISTING STRUCTURES IN THE BASEMENT OF OKLAHOMA WITH IMPLICATIONS FOR INDUCED SEISMICITY

2018 ◽  
Author(s):  
Folarin Kolawole ◽  
◽  
Candace Johnston ◽  
Jefferson C. Chang ◽  
Kurt J. Marfurt ◽  
...  
Keyword(s):  
Induced Seismicity ◽  
Existing Structures

scholarly journals Evaluation of the EC8-3 confidence factors for the characterization of concrete strength in existing structures

2012 ◽  
Vol 45 (11) ◽  
pp. 1737-1758 ◽  
Author(s):  
Xavier Romão ◽  
Rui Gonçalves ◽  
Aníbal Costa ◽  
Raimundo Delgado
Keyword(s):  
Concrete Strength ◽  
Existing Structures

scholarly journals Thermomechanical Characterization of CFRPs under Elevated Temperatures for Strengthening Existing Structures

Fibers ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 80
Author(s):  
Christina Papadimitriou ◽  
Lazaros Melidis ◽  
Lambros Kotoulas ◽  
Nikolaos Makris ◽  
Konstantinos Katakalos
Keyword(s):  
Thermal Loading ◽  
Elevated Temperatures ◽  
Tensile Load ◽  
Concrete Columns ◽  
Fiber Reinforced Polymers ◽  
Reinforced Polymers ◽  
Existing Structures ◽  
Structural Reinforcement ◽  
Constant Tensile Load

Fiber-reinforced polymers (FRP) are rapidly gaining acceptance from the construction sector due to their large effectiveness. They are mainly used as confining reinforcement for concrete columns and as tensile reinforcement for concrete beams, columns and slabs. FRPs are already used to a large extent for applications such as bridges and parking lots, where elevated temperatures are not the main risk. Their increasing use as structural reinforcement is hampered by the concern related to their behavior at elevated temperatures as the relevant research is deficient. Thanks to the significant advantage of FRPs’ mechanical properties, further investigation into the influence of heating on their mechanical behavior may solve many doubts. The present study examines the influence of temperatures, ranging among 50, 100 and 250 °C, on the tensile strength of FRP laminates with carbon fibers (CFRP). In addition, the resistance of CFRP specimens to low-cycle thermal loading at the temperatures of 50, 100 and 250 °C under constant tensile load was investigated. The experiments were carried out in the laboratory of Experimental Strength of Materials and Structures of Aristotle University of Thessaloniki.

Tackling uncertainties in infrastructure sectors through strategic planning: the contribution of discursive approaches in the urban water sector

Water Policy ◽  
2010 ◽  
Vol 13 (3) ◽  
pp. 299-316 ◽  
Author(s):  
Damian Dominguez ◽  
Bernhard Truffer ◽  
Willi Gujer
Keyword(s):  
Strategic Planning ◽  
Planning Process ◽  
Qualitative Assessment ◽  
Urban Water ◽  
Strategic Decisions ◽  
Existing Structures ◽  
Conflicting Objectives ◽  
Planning Approaches

Several strategic planning approaches have been proposed for dealing with future uncertainties in the urban water infrastructure sector. We identify three well established perspectives that address uncertainties in strategic decisions: an adaptive perspective, focusing on an incremental adaptation of existing structures as a reaction to unforeseen developments, a modeling perspective, focusing on an improved characterization of future context conditions and a managerial perspective, focusing on increasing the flexibility of the infrastructure organization. Despite their virtues, these approaches have definite weaknesses in their approach to uncertainty: they often consider a restricted scope of alternatives, they face substantial difficulties in predicting context conditions over time periods of decades and often consider objectives and tradeoffs only implicitly. We elaborate and illustrate with a case study a fourth perspective that may compensate for these specific weaknesses and complement the established strategic planning approaches. This perspective is based on a discursive, qualitative assessment of key elements in the strategic planning process among a selected set of local stakeholders and decision makers. We maintain that this approach leads to a more explicit and reflexive treatment of future uncertainty, conflicting objectives and a broadening of the considered alternatives and therefore to a more robust decision-making process.

The Pull-Out Method For On-Site Estimation of the Elastic Modulus of Concrete

2005 ◽  
Vol 40 (6) ◽  
pp. 505-511 ◽  
Author(s):  
P Antonaci ◽  
P Bocca
Keyword(s):  
Elastic Modulus ◽  
Concrete Strength ◽  
Displacement Curve ◽  
Concrete Mass ◽  
Existing Structures ◽  
Pull Out ◽  
Site Evaluation ◽  
Displacement Transducers ◽  
Force Displacement

The paper describes a new experimental mechanical method for the on-site evaluation of the elastic modulus of concrete. It is based on a modification of the well-known pull-out test, which is currently used for the estimation of concrete strength. The method consists in pulling out a metal insert embedded in the concrete mass and measuring the force-displacement curve consequent to the extraction. Three displacement transducers were used in order to correctly detect the displacement of the insert. Moreover, an adequate number of loading-unloading cycles was performed in order to stabilize the system and eliminate possible phenomena of mutual sliding between the mechanical parts of the apparatus and between the insert and the concrete mass. By performing a certain number of pull-out tests the stiffness value of the system is obtained. The material deformability is then estimated through an appropriate correlation curve between pull-out stiffness and elastic modulus, which has been worked out on the basis of finite element simulations and experimental results. The proposed method offers interesting possibilities of application for the characterization of existing structures at affordable costs.

Seismic reservoir characterization of Duvernay shale with quantitative interpretation and induced seismicity considerations — A case study

2017 ◽  
Vol 5 (2) ◽  
pp. T185-T197 ◽  
Author(s):  
Satinder Chopra ◽  
Ritesh Kumar Sharma ◽  
Amit Kumar Ray ◽  
Hossein Nemati ◽  
Ray Morin ◽  
...  
Keyword(s):  
Media Coverage ◽  
Induced Seismicity ◽  
Oil And Gas ◽  
Reservoir Characterization ◽  
Learning Experience ◽  
Rock Physics ◽  
Quantitative Interpretation ◽  
Gas Generation ◽  
Gaseous Hydrocarbon

The Devonian Duvernay Formation in northwest central Alberta, Canada, has become a hot play in the past few years due to its richness in liquid and gaseous hydrocarbon resources. The oil and gas generation in this shale formation made it the source rock for many oil and gas fields in its vicinity. We attempt to showcase the characterization of Duvernay Formation using 3D multicomponent seismic data and integrating it with the available well log and other relevant data. This has been done by deriving rock-physics parameters (Young’s modulus and Poisson’s ratio) through deterministic simultaneous and joint impedance inversion, with appropriate quantitative interpretation. In particular, we determine the brittleness of the Duvernay interval, which helps us determine the sweet spots therein. The scope of this characterization exercise was extended to explore the induced seismicity observed in the area (i.e., earthquakes of magnitude [Formula: see text]) that is perceived to be associated with hydraulic fracture stimulation of the Duvernay. This has been a cause of media coverage lately. We attempt to integrate our results with the induced seismicity data available in the public domain and elaborate on our learning experience gained so far.

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