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Skivverkan i håldäcksbjälklag - Undersökning av skjuvhållfasthet i fogarna

Herdmo, Victor (2016)
LTH School of Engineering in Helsingborg
Abstract
The part of a structure which separates two floors is called a slab. A type of concrete slab that is becoming increasingly popular is hollow core slabs. A hollow core slab consists of slabs of 1,2 m width placed next to each other, and the space that is created between the slabs is filled with concrete after mounting. The hollow core slab transfers horizontal forces, such as wind load and earth pressure to the stabilizing walls. Diaphragm action in the hollow core slab is a prerequisite for this transmission. Starka Betongelement, which is a producer of hollow core slabs, dimensions the joint between the hollow core slabs for a shear stress of 0,15 MPa along the joint, which is recommended according to Eurocode. This value has been... (More)
The part of a structure which separates two floors is called a slab. A type of concrete slab that is becoming increasingly popular is hollow core slabs. A hollow core slab consists of slabs of 1,2 m width placed next to each other, and the space that is created between the slabs is filled with concrete after mounting. The hollow core slab transfers horizontal forces, such as wind load and earth pressure to the stabilizing walls. Diaphragm action in the hollow core slab is a prerequisite for this transmission. Starka Betongelement, which is a producer of hollow core slabs, dimensions the joint between the hollow core slabs for a shear stress of 0,15 MPa along the joint, which is recommended according to Eurocode. This value has been questioned by clients of Starka Betongelement, a fact that initiated the idea of this work. The aim of the work is to investigate the shear strength of the joint with respect to shear stress along the joint. This has been examined by laboratory testing of three hollow core slabs, each consisting of five slabs of 1,95 m length. The length of the joint, the quality of the concrete in the joint and the amount of reinforcement were varied in the experiments. Eurocode 2 chapter 6.2.5 has been used to calculate the shear strength in a joint. To estimate the stresses a beam subjected to bending in stadium one, two and three has been considered. Further, a literature study was performed, to show which factors that affect the bonding between concrete parts cast at different times. The result of the experiments showed a shear stress of 1,38 MPa in the joint at fracture. The measured values were used to calculate a dimensioning shear strength of 0,52 MPa, which is three times higher than the Eurocode value used today. No actual value of the shear strength of the joint was obtained, since the limiting fracture mode was fracture in the slabs. (Less)
Please use this url to cite or link to this publication:
author
Herdmo, Victor
organization
year
type
M2 - Bachelor Degree
subject
keywords
håldäcksbjälklag, håldäcksplattor, skjuvhållfasthet, skivverkan, fog, betong
language
Swedish
id
8881522
alternative location
https://portal.ch.lu.se/Campus.NET/Services/Publication/Export.aspx?id=2926&type=doc
date added to LUP
2016-06-15 04:07:43
date last changed
2016-06-15 04:07:43
@misc{8881522,
  abstract     = {The part of a structure which separates two floors is called a slab. A type of concrete slab that is becoming increasingly popular is hollow core slabs. A hollow core slab consists of slabs of 1,2 m width placed next to each other, and the space that is created between the slabs is filled with concrete after mounting. The hollow core slab transfers horizontal forces, such as wind load and earth pressure to the stabilizing walls. Diaphragm action in the hollow core slab is a prerequisite for this transmission. Starka Betongelement, which is a producer of hollow core slabs, dimensions the joint between the hollow core slabs for a shear stress of 0,15 MPa along the joint, which is recommended according to Eurocode. This value has been questioned by clients of Starka Betongelement, a fact that initiated the idea of this work. The aim of the work is to investigate the shear strength of the joint with respect to shear stress along the joint. This has been examined by laboratory testing of three hollow core slabs, each consisting of five slabs of 1,95 m length. The length of the joint, the quality of the concrete in the joint and the amount of reinforcement were varied in the experiments. Eurocode 2 chapter 6.2.5 has been used to calculate the shear strength in a joint. To estimate the stresses a beam subjected to bending in stadium one, two and three has been considered. Further, a literature study was performed, to show which factors that affect the bonding between concrete parts cast at different times. The result of the experiments showed a shear stress of 1,38 MPa in the joint at fracture. The measured values were used to calculate a dimensioning shear strength of 0,52 MPa, which is three times higher than the Eurocode value used today. No actual value of the shear strength of the joint was obtained, since the limiting fracture mode was fracture in the slabs.},
  author       = {Herdmo, Victor},
  keyword      = {håldäcksbjälklag,håldäcksplattor,skjuvhållfasthet,skivverkan,fog,betong},
  language     = {swe},
  note         = {Student Paper},
  title        = {Skivverkan i håldäcksbjälklag - Undersökning av skjuvhållfasthet i fogarna},
  year         = {2016},
}