Consulting concrete structures

by Matti Pajari D.Sc. (Tech.)

Contact

  Expertise
Berakon
Peräsin 2 B
FI‑02320 Espoo   
Finland
Tel. +358 40 809 9002
Time zone UTC +2
matti.pajari@berakon.fi
www.berakon.fi
  • Precast and prestressed concrete
  • Reinforcement
  • Connections, inserts and fixings
  • Design rules
  • European standardization
  • European approval of construction products

About Matti Pajari

Selected publications

Estimating quantiles in acceptance criteria for structural components

DOI link:10.23998/rm.144320
Authors: Pajari, Matti; Makkonen, Lassi
Publication: Journal of Structural Mechanics. Vol. 57, No. 3, 2024, pp. 99 – 125.
Keywords: quantile, quantile estimator, quality control, acceptance criterion, small sample, confidence level, structural safety.

Harhattomuusvaatimus johtaa harhaan – mitä tilalle? (in Finnish)

ISSN 2953–9307
Authors: Pajari, Matti; Makkonen, Lasse
Publication: Suomen tilastoseuran vuosikirja 2019 - 2022. 2022, s. 59 – 72.
Keywords:

Parabolic tendons in prestressed concrete – how accurate are equivalent loads

DOI link:10.23998/rm.100697
Authors: Pajari, Matti.
Publication: Journal of Structural Mechanics. Vol. 54, No. 3, 2021, pp. 117 – 129.
Keywords: parabolic tendon, equivalent load, post-tensioning, prestress, concrete, structure.

Probabilistic evaluation of quantile estimators

DOI link:10.1080/03610926.2019.1696975
Authors:Matti Pajari, Maria Tikanmäki & Lasse Makkonen
Publication: Communications in Statistics - Theory and Methods (2019)
VTT keywords: Quantile, Quantile estimator, Goodness of fit, Distribution parameters, Inference

Defining Sample Quantiles by the True Rank Probability

DOI link:10.1155/2014/326579
Authors: Makkonen, Lasse; Pajari, Matti.
Publication: Hindawi Publishing Corporation. Journal of Probability and Statistics. Volume 2014, Article ID 326579, 6 pages.
VTT keywords:--

Discussion on "Plotting positions for fitting distributions and extreme value analysis"

DOI link:10.1139/cjce-2013-0227
Authors:Makkonen, Lasse; Pajari, Matti; Tikanmäki, Maria
Publication: Canadian Journal of Civil Engineering. NRC Research Press. Vol. 40 (2013) No: 9, 927–929
VTT keywords:empirical distribution function, extreme value analysis, order-statistics, plotting positions

Closure to "Problems in the extreme value analysis" (Struct. Safety 2008:30:405-419)

PDF:http://www.vtt.fi/inf/julkaisut/muut/2013/OA-Closure_to_problems.pdf
Authors:Makkonen, Lasse; Pajari, Matti; Tikanmäki, Maria
Publication:Structural Safety. Elsevier. Vol. 40 (2013) No: January, 65–67
VTT keywords: extreme value analysis, extremes, order-statistics, plotting positions, probability theory

Prestressed hollow core slabs supported on beams. Finnish shear tests on floors in 1990–2006

PDF:http://www.vtt.fi/inf/pdf/workingpapers/2010/W148.pdf
Authors:Pajari, Matti
Publication: 2010. VTT, Espoo. 674 p.
                    VTT Working Papers : 148
VTT keywords: prestress, hollow core slab, flexible support, shear resistance, floor test, composite, construction, concrete

Tests and analysis on shear strength of composite slabs of hollow core units and concrete topping

DOI link:10.1016/j.conbuildmat.2007.05.013
Authors:Girhammar, Ulf Arne; Pajari, Matti
Publication: Construction and Building Materials. Vol. 22 (2008) No: 8, 1708-1722
VTT keywords: Precast concrete, Hollow core slabs, Concrete topping, Composite construction floors, Composite action, Shear/bond strength

Shear and torsion in hollow core slabs

Authors: Broo, Helén; Lundgren, Karin; Engström, Björn; Pajari, Matti
Publication: XIX Symposium on Nordic Concrete Research and Development. Sandefjord, NO, 13–15 June 2005
                    Proceedings Nordic Concrete Research Meeting (2005), 305–307
VTT keywords: hollow core slab, shear and torsion interaction, nonlinear finite element analyses, shear-torsion capacity

Shear and torsion in hollow core slabs

Authors: Lundgren, Karin; Broo, Helén; Engström, Björn; Pajari, Matti
Publication: Keep Concrete Attractive. Budapest 23–25 May 2005. fib (2005), 594–599

Shear and torsion in hollow core slabs: How advanced modelling can be used in design

Authors: Lundgren, Karin; Broo, Helén; Engström, Björn; Pajari, Matti
Publication: 18th BIBM International Congress. Amsterdam,11–14 May 2005. BIBM (2005), 137–138

Resistance of prestressed hollow core slabs against web shear failure

PDF:http://www.vtt.fi/inf/pdf/tiedotteet/2005/T2292.pdf
Authors:Pajari, Matti
Publication: 2005. VTT, Espoo. 47 p. + app. 15 p.
                    VTT Tiedotteita–Research Notes : 2292
VTT keywords: hollow core slab, prestress, shear, test, resistance, concrete, precast, structure, design, Eurocode

Pure torsion tests on single hollow core slabs

PDF:http://www.vtt.fi/inf/pdf/tiedotteet/2004/T2273.pdf
Authors:Pajari, Matti
Publication: 2004. VTT Building and transport, Espoo. 29 p. + app. 28 p.
                    VTT Tiedotteita–Research Notes : 2273
VTT keywords: shear tests, torsion tests, hollow core slabs, testing, test specimens, load testing, failure loads, concrete, precast, prestressed, structure

Shear-torsion tests on 400 mm hollow core floor

PDF:http://www.vtt.fi/inf/pdf/tiedotteet/2004/T2274.pdf
Authors:Pajari, Matti
Publication: 2004. VTT Building and transport, Espoo. 30 p. + app. 82 p.
                    VTT Tiedotteita–Research Notes : 2274
VTT keywords: shear tests, torsion tests, hollow core slabs, floors, testing, test specimens, load testing, failure loads, load distribution, concrete, precast, prestressed, structure

Shear-torsion interaction tests on single hollow core slabs

PDF:http://www.vtt.fi/inf/pdf/tiedotteet/2004/T2275.pdf
Authors:Pajari, Matti
Publication: 2004. VTT Building and transport, Espoo. 76 p. + app. 122 p.
                    VTT Tiedotteita–Research Notes : 2275
VTT keywords: shear tests, torsion tests, hollow core slabs, testing, test specimens, load testing, failure loads, concrete, precast, prestressed, structure

Shear-torsion tests on 200 mm hollow core floor

PDF:http://www.vtt.fi/inf/pdf/tiedotteet/2004/T2276.pdf
Authors:Pajari, Matti
Publication: 2004. VTT Building and transport, Espoo. 55 p. + app. 116 p.
                    VTT Tiedotteita–Research Notes : 2276
VTT keywords: shear tests, torsion tests, hollow core slabs, floors, testing, test specimens, load testing, failure loads, load distribution, concrete, precast, prestressed, structure

Shear resistance of PHC slabs supported on beams. II: Analysis

Authors: Pajari, Matti
Publication: ASCE: Journal of Structural Engineering. Vol. 124 (1998) No: 9, 1062–1073

Shear resistance of PHC slabs supported on beams. 1: Tests

Authors: Pajari, Matti; Koukkari, Heli
Publication: ASCE: Journal of Structural Engineering. Vol. 124 (1998) No: 9, 1050–1061

Interaction between hollow core slabs and supporting beams

Authors: Pajari, Matti
Publication: Composite Construction–Conventional and Innnovative. Innsbruck, 16–18 Sept. 1997. Composite Construction c/o IABSE; CEB; CIG; ECCS; FIP; RILEM; ASCCS (1997), 831–836

Flexible supports II : Tests and a linear model for shear resistance of hollow core slabs supported on beams

Authors: Pajari, Matti; Koukkari, Heli
Publication: XVI Symposium on Nordic Concrete Research. Helsinki, 21–23 August 1996. Nordic Concrete Federation (1996), 206–207
VTT keywords: hollow core slab, shear composite action, flexible support

Shear capacity of notched prestressed hollow core slabs with circular voids

Authors: Girhammar, Ulf Arne; Pajari, Matti
Publication: Structural Engineering Review. Vol. 7 (1995) No: 2, 63–74

Reduction of vertical shear resistance in hollow-core slabs when supported on beams

Authors: Leskelä, Matti; Pajari, Matti
Publication: Concrete '95 Conference, Brisbane, Australia, 4–7 Sept. 1995. FIP (1995), 11 p.

Shear resistance of prestressed hollow core slabs on flexible supports

Authors: Pajari, Matti
Publication:1995. VTT, Espoo. 132 p. + app. 25 p.
                    VTT Publications : 228
                    Doctoral dissertation
VTT keywords: prestress, hollow core slab, concrete structures, precast concrete, design, prefabrication, slim floor, shear, composite structures, flexible support, loading test, composite beam

Shear capacity of hollow core slabs on flexible supports

Authors: Pajari, Matti; Yang, Lin
Publication: 1994. VTT, Espoo. 111 p. + app. 26 p.
                    VTT Tiedotteita–Meddelanden–Research Notes : 1587
VTT keywords: prestress, hollow core slab, concrete structures, precast concrete, design, prefabrication, slim floor, shear, composite structures, flexible support, loading test, composite beam

Design of prestressed hollow core slabs

Authors: Pajari, Matti
Publication:1989. VTT, Espoo. 88 p. + app. 38 p.
                    Tutkimuksia / Valtion teknillinen tutkimuskeskus : 657
VTT keywords: hollow core slabs, concrete construction, concrete slabs, concrete productcs, design, computer programs, predictions, failure, simulation

Computer aided design and comparison of alternative building frames

Authors: Pajari, Matti
Publication:1988. VTT, Espoo. 64 p.
                    Tutkimuksia / Valtion teknillinen tutkimuskeskus : 506
VTT keywords: structural design, building construction, dimensioning, modelling, cost estimates, computer models, computer programs