Sökning: "prestress"

Visar resultat 1 - 5 av 7 uppsatser innehållade ordet prestress.

  1. 1. Shear strength of prestressed concrete beams without shear reinforcement : A comparison between equations

    Master-uppsats, KTH/Betongbyggnad

    Författare :Bawan Azad; [2021]
    Nyckelord :Shear force; prestress concrete; design provisions; Eurocode; carrying capacity; parametric study; concrete beam; Tvärkraft; förspänd betong; dimensioneringsbestämmelser; Eurokod; bärförmåga; parameterstudie; betongbalk;

    Sammanfattning : A new version of EN 1992-1-1, Eurocode 2 for Design of Concrete Structures, is under development and one of the most discussed topics is shear capacity for prestressed concrete beams without shear reinforcement, partly because shear failure occurs suddenly and can have catastrophic consequences. For the new version of Eurocode, there are a total of three proposed equations to replace the two equations that currently exist in EN 1992-1-1 for shear capacity of prestressed concrete beams without shear reinforcement. LÄS MER

  3. 2. Analysis of post-tensioned concrete box-girder bridges : A comparison of Incremental launching and Movable scaffolding system

    Master-uppsats, KTH/Bro- och stålbyggnad

    Författare :Hamad El Hamad; Furkan Tanhan; [2018]
    Nyckelord :Movable scaffolding system; MSS; Incremental launching; post-tension; prestress; slen- derness; box-girder; Stockholm Bypass; Movable scaffolding system; MSS; Etappvis lansering; efterspänning; förspänning; slankhet; box-girder; Förbifart Stockholm;

    Sammanfattning : When designing a bridge it is of high importance that the geometry for the cross section is optimized for the structure. This is partly due to the influence of the amount of material needed and its impact on the budget and environment. LÄS MER

  4. 3. Inverkan av placering av spännkablar pågenomstansningskapacitet hos armeradebetongplattor

    M1-uppsats, KTH/Byggteknik och design

    Författare :David Tran; Sebastian Correa; [2018]
    Nyckelord :ACI; critical shear crack theory CSCT ; Eurocode 2; Flat slabs; MC 2010; Post tensioned concrete; Prestress concrete; Punching shear; Slabs; Tendon; Tendon Placement; Tension; Two-way shear; Unbonded tendons; ACI; betonggenomstansning; betongplatta; dragspänning; efterspänd betong; Eurokod 2; Genomstansning; icke vidhäftande spännkablar; kabel; kabelplacering; MC 2010; platta; spännbetong;

    Sammanfattning : På grund av bostadsbristen de senaste åren har byggbranschen varit tvungen att möta den höga efterfrågan på bostäder. Ett sätt att underlätta det tryck som skapats på grund av den höga efterfrågan är att rekonstruera byggnader avsedda för annan användning än bostäder till bostadshus. LÄS MER

  5. 4. Widening of The Nockeby Bridge : Methods for strengthening the torsional resistance

    Master-uppsats, KTH/Bro- och stålbyggnad

    Författare :Jenny Andersson; [2016]
    Nyckelord :Strengthening of bridges; external prestressed reinforcement; carbon-fiber reinforced polymer; torsion; torsional resistance; prestressed concrete; Förstärkning av broar; extern spännarmering; kolfiberförstärkning; vridning; vridkapacitet; förspänd betong;

    Sammanfattning : i Abstract The Nockeby Bridge, in the western part of Stockholm, is a prestressed concrete bridge with an openable swing span of steel. The bridge was built during 1970 and should now be widened with 0.5 meters on each side. The concrete bridge deck is supported by two main-beams and cross-beams are located at the position of all supports. LÄS MER

  7. 5. Coupled Dynamic 3D Simulation of Short Circuit Forces

    Master-uppsats, Blekinge Tekniska Högskola/Sektionen för ingenjörsvetenskap

    Författare :PRITESH DULABHAI HADIYA; [2013]
    Nyckelord :Two dimensional axisymmetric; Three dimensional model; Comsol Multiphysics; Transformer short circuit.;

    Sammanfattning : The purpose of this work is to find the effect of short circuit current on displacement inside the transformer’s winding. In this work two different winding has been investigated by creating 2D and 3D simulation models of them. In order to solve the problem various assumptions/simplification has been taken and verified. LÄS MER