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  2. Prestressed concrete - Wikipedia

    en.wikipedia.org/wiki/Prestressed_concrete

    Prestressed concrete is a form of concrete used in construction. It is substantially "prestressed" ( compressed) during production, in a manner that strengthens it against tensile forces which will exist when in service. [ 1][ 2]: 3–5 [ 3] This compression is produced by the tensioning of high-strength "tendons" located within or adjacent to ...

  3. Concrete cone failure - Wikipedia

    en.wikipedia.org/wiki/Concrete_cone_failure

    Under tension loading, the concrete capacity of a single anchor is calculated assuming an inclination between the failure surface and surface of the concrete member of about 35°. The concrete cone failure load N 0 {\displaystyle N_{0}} of a single anchor in uncracked concrete unaffected by edge influences or overlapping cones of neighboring ...

  4. Precast concrete lifting anchor system - Wikipedia

    en.wikipedia.org/wiki/Precast_concrete_lifting...

    No panel rotation is being considered. Panel. Volume: V = w x h x d = 6.0 m x 3.0 m x 0.15 m = 2.7 m 3. Weight: W = V x concrete specific gravity = 2.7 m 3 x 24 kN/m 3 = 64.8 kN. Calculated casting bed suction. Suction area: A = w x h = 6.0 m x 3.0 m = 18 m 2. Assuming 1.0 kN/m 2 is applied for oiled steel formwork.

  5. concrete CMS - Wikipedia

    en.wikipedia.org/wiki/Concrete_CMS

    Website. www .concretecms .com. Concrete CMS (formerly concrete5) is an open-source content management system (CMS) for publishing content on the World Wide Web and intranets. [3] [4] Concrete CMS is designed for ease of use, for users with a minimum of technical skills. It enables users to edit site content directly from the page.

  6. Cutoff frequency - Wikipedia

    en.wikipedia.org/wiki/Cutoff_frequency

    The cutoff frequency is the critical frequency between propagation and attenuation, which corresponds to the frequency at which the longitudinal wavenumber is zero. It is given by The wave equations are also valid below the cutoff frequency, where the longitudinal wave number is imaginary. In this case, the field decays exponentially along the ...

  7. Lift slab construction - Wikipedia

    en.wikipedia.org/wiki/Lift_slab_construction

    Lift slab construction. Lift slab construction (also called the Youtz-Slick Method) is a method of constructing concrete buildings by casting the floor or roof slab on top of the previous slab and then raising (jacking) the slab up with hydraulic jacks. This method of construction allows for a large portion of the work to be completed at ground ...

  8. Renormalization group - Wikipedia

    en.wikipedia.org/wiki/Renormalization_group

    e. In theoretical physics, the term renormalization group ( RG) refers to a formal apparatus that allows systematic investigation of the changes of a physical system as viewed at different scales. In particle physics, it reflects the changes in the underlying force laws (codified in a quantum field theory) as the energy scale at which physical ...

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