Topic
Flexural rigidity
About: Flexural rigidity is a research topic. Over the lifetime, 3829 publications have been published within this topic receiving 56780 citations.
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TL;DR: In this article, the influence of gap between steel tube and concrete core on the compressive and flexural behavior of CFST members was investigated. But the main parameters of these tests were the gap type (circumferential and spherical-cap) and gap ratio.
76 citations
TL;DR: In this article, the bending free energy of a tensionless bilayer is proportional to the square of the Fourier coefficients of the undulation modes, and the proportionality constant then provides the bending rigidity of the layer.
Abstract: Helfrich's theory predicts that the bending free energy of a tensionless amphiphilic bilayer is proportional to the square of the Fourier coefficients of the undulation modes. Equilibrium molecular dynamics simulations with coarse-grained amphiphiles confirm the correctness of this prediction for thermally excited undulations. The proportionality constant then provides the bending rigidity of the layer. Non-equilibrium methods, in particular umbrella sampling, potential of mean constraint force, and thermodynamic integration in Cartesian coordinates, have been used to extend the range of sampled amplitudes. For small amplitudes there is a good agreement with the equilibrium simulations, while beyond the thermally accessible amplitudes a clear deviation from theory is observed. Calculations of the elastic modulus showed a pronounced system size dependence.
76 citations
TL;DR: In this paper, structural testing of nine steel reinforced Alkali activated fly ash concrete (AAFAC) beams is explored, including three over-reinforced, three under-reined, and three shear critical AAFAC beam samples, all tested in four point monotonic bending.
Abstract: Alkali activated fly ash concrete (AAFAC) is an alternative form of concrete that uses coal fly ash as a 100 % replacement for ordinary portland cement (OPC). In this paper structural testing of nine steel reinforced AAFAC beams is explored. The test matrix included three over-reinforced, three under-reinforced, and three shear critical AAFAC beam samples, all tested in four point monotonic bending. For control purposes, an identical set of OPC concrete (OPCC) beams was fabricated and tested under identical conditions. Data collection during testing included load, deflection, top and side fiber concrete strains, and crack width. Test results show that AAFAC beams have very similar behavior to companion OPCC beams. This applies to load induced crack pattern, crack width magnitude, neutral axis location, flexural stiffness, and ultimate flexural and ultimate shear strengths. The research concludes that AAFAC flexural members can be designed using existing ACI 318-08 methods developed for OPCC, and that this applies to both the service and ultimate limit states.
75 citations
TL;DR: The FAST system as discussed by the authors is developed by CSIRO for quality control and assurance of fabrics, which consists of a series of instruments and test methods which are inexpensive, robust and simple to use.
Abstract: Describes the FAST system, developed by CSIRO for quality control and assurance of fabrics. FAST, or Fabric Assurance by Simple Testing, consists of a series of instruments and test methods which are inexpensive, robust and simple to use. It measures properties which are closely related to the ease of garment making‐up and the durability of worsted finishing. FAST‐1 gives a direct reading of fabric thickness over a range of loads with micrometre resolution. FAST‐2 measures the fabric bending length and its bending rigidity. FAST‐3 measures fabric extensibility at low loads as well as its shear rigidity. FAST‐4 is a quick test for measuring fabric dimensional stability, including both the relaxation shrinkage and the hygral expansion.
75 citations
TL;DR: In this paper, an experimental study on the strengthening of wood beams under bending loads through the use of very high strength steel cords was presented. And the results of 21 double shear push-out tests were conducted to determine the strength of steel fiber Reinforced Polymers (SRP) bonded to wood prisms.
Abstract: This paper presents an experimental study on the strengthening of wood beams under bending loads through the use of very high strength steel cords. The study also presents the results of 21 double shear push-out tests conducted to determine the strength of Steel fiber Reinforced Polymers (SRP) bonded to wood prisms. An experimental programme based on a four-point bending test configuration is proposed to characterize the stiffness, ductility and strength response of strengthened wood beams. Mechanical tests on the strengthened wood showed that external bonding of steel fibers produce high increases in flexural stiffness and capacity. Finally experiment results are used to calibrate existing analytical formulations for capacity prediction. This economic and effective technique may be an interesting alternative to glass or carbon fibers or other expensive retrofitting methods.
75 citations