Gabriel Sas
Gabriel Sas

Gabriel Sas

Associate Professor
Luleå University of Technology
Structural Engineering
Structural and Fire Engineering
Department of Civil, Environmental and Natural Resources Engineering
gabriel.sas@ltu.se
F964 Luleå

Research interests

  • Strengthening, upgrading and retrofitting of concrete structures using fibre reinforced polymers (FRPs)
  • Structural stability of concrete gravity and plate dams
  • Life cycle cost analysis (LCCA) of structures
  • Destructive and non-destructive test methods for structural engineering
  • Monitoring methods and equipment for the behaviour of structures
  • Fatigue performance of structures 
  • Prestressing of concrete structures
  • Design of UHPC structures
  • Reliability based non linear analysis

Professional expertise

  • Design and assessment of structural capacity of concrete structures, bridges and dams
  • Design of strengthening of concrete structures using FRPs
  • Non-linear finite element modelling
  • Management of field testing and monitoring of structures
  • Management of research and industrial projects

Activities and projects

Publications

Article in journal

Experimental study on shear deformation of reinforced concrete beams using digital image correlation (2019)

Huang. Z, Tu. Y, Meng. S, Sabau. C, Popescu. C, Sas. G
Engineering structures, Vol. 181, s. 670-698
Article in journal

Local and global behavior of walls with cut-out openings in multi-story reinforced concrete buildings (2019)

Sabau. C, Popescu. C, Bagge. N, Sas. G, Blanksvärd. T, Täljsten. B
Engineering structures, Vol. 187, s. 57-72
Chapter in book

Assessment and Loading to Failure of Three Swedish RC Bridges (2018)

Nilimaa. J, Sabau. C, Bagge. N, Puurula. A, Sas. G, Blanksvärd. T, et al.
Part of: Evaluation of Concrete Bridge Behavior through Load Testing
Article in journal

Axially Loaded RC Walls with Cutout Openings Strengthened with FRCM Composites (2018)

Sabau. C, Popescu. C, Sas. G, Blanksvärd. T, Täljsten. B
Journal of composites for construction, Vol. 22, nr. 6, s. 04018046-1-04018046-16
Conference paper

Bridges tested to failure in Sweden (2018)

Täljsten. B, Blanksvärd. T, Sas. G, Bagge. N, Nilimaa. J, Popescu. C, et al.
Part of: IABSE Conference 2018 – Engineering the Past, to Meet the Needs of the FutureJune 25-27 2018, Copenhagen, Denmark, 2018
Article in journal

Finite element analysis of shear deformation in reinforced concrete shear-critical beams (2018)

Huang. Z, Lu. Z, Song. S, Tu. Y, Blanksvärd. T, Sas. G, et al.
Structure and Infrastructure Engineering, Vol. 14, nr. 6, s. 791-806
Conference paper

Lessons Learnt from Full-Scale Tests of Bridges in Croatia and Sweden (2018)

Duvnjak. I, Bartolak. M, Nilimaa. J, Sas. G, Blanksvärd. T, Täljsten. B, et al.
Part of: IABSE Symposium, Nantes 2018, Tomorrow's Megastructures, International Association for Bridge and Structural Engineering, 2018, S23-127
Conference paper

Load-testing used for qulity control of bridges (2018)

Elfgren. L, Täljsten. B, Blanksvärd. T, Sas. G, Nilimaa. J, Bagge. N, et al.
Part of: Quality Specifications for Roadway Bridges, Workshop of COST TU 1406, s. 1-6, 2018
Conference paper

Railway Bridges on the Iron Ore Line in Northern Sweden– From Axle Loads of 14 to 32,5 ton (2018)

Coric. I, Täljsten. B, Blanksvärd. T, Sas. G, Ohlsson. U, Elfgren. L
Part of: IABSE Conference 2018 – Engineering the Past, to Meet the Needs of the FutureJune 25-27 2018, Copenhagen, Denmark, IABSE Reports, Vol 111, 2018
Article in journal

Strengthening of RC beams using bottom and side NSM reinforcement (2018)

Sabau. C, Popescu. C, Sas. G, Schmidt. J, Blanksvärd. T, Täljsten. B
Composites Part B, Vol. 149, s. 82-91
Conference paper

Assessment of concrete bridges - Prestress forces (2017)

Experiences from full-scale testing to failure of a bridge in Kiruna
Bagge. N, Nilimaa. J, Sas. G, Blanksvärd. T, Täljsten. B, Carolin. A, et al.
Part of: Proceedings of the 23rd Nordic Concrete Research Symposium, Oslo, Norway: Nordic Concrete Federation, s. 267-270, Nordic Concrete Federation, 2017
Conference paper

Assessment of concrete bridges - Structural capacity (2017)

Experiences from full-scale testing to failure of a bridge in Kiruna
Bagge. N, Nilimaa. J, Sas. G, Blanksvärd. T, Bernspång. L, Täljsten. B, et al.
Part of: Proceedings of the 23rd Nordic Concrete Research Symposium, Oslo, Norway: Nordic Concrete Federation, s. 263-266, Nordic Concrete Federation, 2017
Article in journal

Assessment of RC walls with cut-out openings strengthened by FRP composites using a rigid-plastic approach (2017)

Popescu. C, Schmidt. J, Goltermann. P, Sas. G
Engineering structures, Vol. 150, s. 585-598
Article in journal

Concrete walls with cutout openings strengthened by FRP confinement (2017)

Popescu. C, Sas. G, Blanksvärd. T, Täljsten. B
Journal of composites for construction, Vol. 21, nr. 3
Conference paper

Concrete Walls with Openings Strengthened Using FRCM Composites (2017)

Sabau. C, Popescu. C, Sas. G, Blanksvärd. T, Täljsten. B
Part of: Advanced Composites in Construction, Conference Proceedings, s. 188-192, NetComposites Limited, 2017
Conference paper

Effect of Confinement with FRCM Composites on Damaged Concrete Cylinders (2017)

Gonzalez-Libreros. J, Sabau. C, Sneed. L, Sas. G, Pellegrino. C
Part of: Strain-Hardening Cement-Based Composites, Shcc4, s. 770-777, Springer, 2017
Conference paper

Full-Scale Tests to Failure Compared to Assessments (2017)

Three Concrete Bridges
Bagge. N, Nilimaa. J, Puurula. A, Täljsten. B, Blanksvärd. T, Sas. G, et al.
Part of: High Tech Concrete, Where Technology and Engineering Meet - Proceedings of the 2017 fib Symposium, s. 1917-1924, Springer, 2017
Conference paper

Performance of RC Walls with Openings Strengthened by Fiber Reinforced Polymers (2017)

An Experimental and Theoretical Investigation
Popescu. C, Sas. G, Blanksvärd. T, Täljsten. B
Part of: Advances in Construction Materials and Systems, Proceedings of an International Conference (ICACMA), Chennai, India, September 3-8 2017, s. 509-517, Rilem publications, 2017
Article in journal

State of research on shear strengthening of RC beams with FRCM composites (2017)

Gonzalez-Libreros. J, Sabau. C, Sneed. L, Pellegrino. C, Sas. G
Construction and Building Materials, Vol. 149, s. 444-458
Conference paper

Testing Bridges to Failure (2017)

Experiences
Häggström. J, Bagge. N, Nilimaa. J, Sas. G, Blanksvärd. T, Täljsten. B, et al.
Part of: IABSE Symposium, Vancouver, 2017, Engineering the Future, s. 2832-2839, IABSE - International Association for Bridges and Structural Engineering, 2017
Article in journal

Use of image correlation system to study the bond behavior of FRCM-concrete joints (2017)

Sabau. C, Gonzalez-Libreros. J, Sneed. L, Sas. G, Pellegrino. C, Täljsten. B
Materials and Structures, Vol. 50, nr. 3
Conference paper

3D non-linear FE analysis of a full scale test to failure of a RC Railway Bridge strengthened with carbon fibre bars (2016)

Puurula. A, Enochsson. O, Sas. G, Blanksvärd. T, Ohlsson. U, Bernspång. L, et al.
Part of: IABSE CONGRESS, STOCKHOLM, 2016, Challenges in Design and Construction of an Innovativeand Sustainable Built Environment, s. 2527-2535, International Association for Bridge and Structural Engineering, 2016
Conference paper

Analysis of the shear strength of joints in segmental prestressed concrete bridges (2016)

Song. S, Yang. D, Tu. Y, Sas. G, Blanksvärd. T, Elfgren. L
Part of: 19th IABSE Congress Strockholm 21-23 September 2016, Challenges in Design and Construction of an Innovative and Sustainable Built Environment, s. 573-579, 2016
Article in journal

Effect of cut-out openings on the axial strength of concrete walls (2016)

Popescu. C, Sas. G, Sabau. C, Blanksvärd. T
Journal of Structural Engineering, Vol. 142, nr. 11
Article in journal

Evaluation of freeze-thaw damage on concrete material and prestressed concrete specimens (2016)

Qin. X, Meng. S, Cao. D, Tu. Y, Sabourova. N, Grip. N, et al.
Construction and Building Materials, Vol. 125, s. 892-904
Conference paper

Experimental investigation on RC beams strenghened in shear with  externally bonded composites (2016)

Gonzalez-Libreros. J, Sabau. C, Sneed. L, Pellegrino. C, Sas. G
Part of: Eighth International Conference onFibre-Reinforced Polymer (FRP) Composites in Civil Engineering, s. 384-389, The Hong Kong Polytechnic University, 2016
Conference paper

Influence of the fiber type and matrix age of the bonding of FRCM composite strips applied to concrete substrates (2016)

Sabau. C, Gonzalez-Libreros. J, Sneed. L, Sas. G, Pellegrino. C
Part of: Eighth International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering, s. 456-461, 2016
Book

Kompositförstärkning av betong (2016)

Täljsten. B, Blanksvärd. T, Sas. G
Conference paper

Monitoring structural behavior of reinforced concrete walls with openings using digital image correlation (2016)

Sabau. C, Popescu. C, Sas. G, Blanksvärd. T, Täljsten. B
Part of: IABSE CONGRESS, STOCKHOLM, 2016, Challenges in Design and Construction of an Innovative and Sustainable Built Environment, s. 1803-1811, International Association for Bridge and Structural Engineering, 2016
Conference paper

More Realistic Codes for Existing Bridges (2016)

Nilimaa. J, Bagge. N, Häggström. J, Blanksvärd. T, Sas. G, Täljsten. B, et al.
Part of: IABSE CONGRESS, STOCKHOLM, 2016, Challenges in Design and Construction of an Innovativeand Sustainable Built Environment, s. 399-407, 2016
Conference paper

Shear strengthening of RC beams with FRCM (2016)

what do we know so far?
Gonzalez-Libreros. J, Sabau. C, Sneed. L, Pellegrino. C, Sas. G
Part of: Eighth International Conference onFibre-Reinforced Polymer (FRP) Compositesin Civil Engineering, s. 462-467, The Hong Kong Polytechnic University, 2016
Conference paper

Two-way walls with cut-out openings strengthened by fiberreinforced polymers (2016)

Popescu. C, Sas. G, Blanksvärd. T, Täljsten. B
Part of: 19th IABSE Congress Strockholm 21-23 September 2016, Challenges in Design and Construction of an Innovative and Sustainable Built Environment, s. 1394-1400, International Association for Bridge and Structural Engineering, 2016
Article in journal

Assessment of the Strengthening of an RC Railway Bridge with CFRP utilizing a Full-Scale Failure Test and Finite-Element Analysis (2015)

Puurula. A, Enochsson. O, Sas. G, Blanksvärd. T, Ohlsson. U, Bernspång. L, et al.
Journal of Structural Engineering, Vol. 141, nr. 1 (Special Issue), s. D4014008-1-D4014008-11
Article in journal

Concrete walls weakened by openings as compression members: A review (2015)

Popescu. C, Sas. G, Blanksvärd. T, Täljsten. B
Engineering structures, Vol. 89, s. 172-190
Conference paper

Experimental tests on RC walls with openings strengthened by FRP (2015)

Popescu. C, Sas. G, Sabau. C, Blanksvärd. T, Täljsten. B
Part of: The 12th International Symposium on Fiber Reinforced Polymers for Reinforced Concrete Structures (FRPRCS-12) & The 5th Asia-Pacific Conference on Fiber Reinforced Polymers in Structures (APFIS-2015), Southeast University, 2015
Conference paper

Loading to failure of a 55 year old prestressed concrete bridge (2015)

Bagge. N, Nilimaa. J, Sas. G, Blanksvärd. T, Elfgren. L, Tu. Y, et al.
Part of: IABSE Workshop Helsinki 2015, Safety, Robustness and Condition Assessments of Structures, s. 130-137, International Association for Bridge and Structural Engineering, 2015
Conference paper

Performance of a prestressed concrete bridge loaded to failure (2015)

Bagge. N, Nilimaa. J, Blanksvärd. T, Bernspång. L, Täljsten. B, Elfgren. L, et al.
Part of: IABSE Conference Geneva 2015, Structural Engineering: Providing Solutions to Global Challenges, s. 1088-1095, International Association for Bridge and Structural Engineering, 2015
Conference paper

Tested versus code capacity of existing bridges (2015)

Three examples
Sas. G, Bagge. N, Häggström. J, Nilimaa. J, Puurula. A, Blanksvärd. T, et al.
Part of: IABSE Conference Geneva 2015, Structural Engineering: Providing Solutions to Global Challenges, s. 727-734, International Association for Bridge and Structural Engineering, 2015
Article in journal

Using digital image correlation to evaluate fatigue behavior of strengthened reinforced concrete beams (2015)

Mahal. M, Blanksvärd. T, Täljsten. B, Sas. G
Engineering structures, Vol. 105, s. 277-288
Conference paper

A state of the art review on walls with openings strengthened by use of fiber reinforced polymers (2014)

Popescu. C, Sas. G, Täljsten. B, Blanksvärd. T
Part of: Proceedings of The 7th International Conference on FRP Composites in Civil Engineering (CICE 2014), International Institute for FRP in Construction (IIFC), 2014, 128
Article in journal

Experimental Program for Axially Loaded RC Walls with Openings Strengthened by FRP (2014)

Popescu. C, Sas. G, Täljsten. B, Blanksvärd. T
Nordic Concrete Research, Vol. 50, s. 285-288
Article in journal

Full-Scale Test to Failure of a Prestressed Concrete Bridge in Kiruna (2014)

Bagge. N, Blanksvärd. T, Sas. G, Bernspång. L, Täljsten. B, Carolin. A, et al.
Nordic Concrete Research, Vol. 50, s. 83-86
Article in journal

Loading to failure and 3D nonlinear FE modelling of a strengthened RC bridge. (2014)

Puurula. A, Enochsson. O, Sas. G, Blanksvärd. T, Ohlsson. U, Bernspång. L, et al.
Structure and Infrastructure Engineering, Vol. 10, nr. 12, s. 1606-1619
Article in journal

Maintenance and Renewal of Concrete Rail Bridges (2014)

Results from EC project MAINLINE
Nilimaa. J, Häggström. J, Bagge. N, Blanksvärd. T, Sas. G, Ohlsson. U, et al.
Nordic Concrete Research, Vol. 50, s. 25-28
Article in journal

Numerical optimization of strengthening disturbed regions of dapped-end beams using NSM and EBR CFRP (2014)

Sas. G, Dăescu. C, Popescu. C, Tamás. N
Composites Part B, Vol. 67, s. 381-390
Article in journal

Strengthening of concrete structures with FRP (2014)

a guideline
Täljsten. B, Sas. G, Blanksvärd. T
Nordic Concrete Research, Vol. 49, s. 113-126
Article in journal

Strengthening of concrete structures with FRP (2014)

a guideline
Täljsten. B, Sas. G, Blanksvärd. T
Nordic Concrete Research, Vol. 50, s. 289-292
Article in journal

Tests on reinforced concrete slabs with cut-out openings strengthened with fibre-reinforced polymers (2014)

Floruț. S, Sas. G, Popescu. C, Stoian. V
Composites Part B, Vol. 66, s. 484-493
Article in journal

The Development of an Experimental Program through Design of Experiments and FEM Analysis (2014)

A Preliminary Study
Popescu. C, Sas. G
Nordic Concrete Research, Vol. 51, s. 29-42