Experimental investigation of the behaviour of pinned beam to column connections to pure shear monotonic and cyclic excitation

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1 SAFECAST PERFORMANCE OF INNOVATIVE MECHANICAL CONNECTIONS IN PRECAST BUILDING STRUCTURES UNDER SEISMIC CONDITIONS Experimental investigation of the behaviour of pinned beam to column connections to pure shear monotonic and cyclic excitation I. N. Psycharis, H. P. Mouzakis, G. D. Kremmyda Laboratory for Earthquake Engineering National Technical University, Athens, Greece

2 The SAFECAST project PERFORMANCE OF INNOVATIVE MECHANICAL CONNECTIONS IN PRECAST BUILDING STRUCTURES UNDER SEISMIC CONDITIONS Research for the benefit of SME s Grant agreement number: Project Coordinator: Dr Antonella Colombo ASSOBETON Consortium 5 National Associations of precast concrete producers: ASSOBETON, Italy ANDECE, Spain ANIPB, Portugal SEVIPS, Greece TPCA, Turkey

3 The SAFECAST project 7 Research Institutions (RTD providers): Joint Research Centre Elsa Laboratory, Italy Politecnico di Milano, Italy National Technical University of Athens, Greece Istanbul Technical University, Turkey Laboratorio Nacional de Engenharia Civil. Portugal University of Ljubljana, Slovenia Labor, Italy 4 SME s DLC, Italy PRELOSAR, Spain LUGEA, Italy HALFEN, Germany

4 The SAFECAST project The project aims to the experimental investigation and numerical validation of the dynamic behavior of jointsand connectionsin precast structures towards a correct seismic design. The research activity is directly relevant to the interests of the precast construction industry, thus it is directed to the precast systems commonly used in the participating countries. The research is focused on dry connections, consisting of mechanical devices, which is the most common type in modern precast buildings, especially industrial buildings, in southern Europe and elsewhere.

5 The SAFECAST project Five types of connections are considered: 1. Between adjacent floor or roof elements 2. Between floor or roof panels and supporting beams 3. Between columns and beams 4. Between segments of columns or between columns and foundations 5. Between cladding panels and structural elements

6 Pinned beam to column connections 2 dowels O20 bolted dowels O20 bolted Precast beam Precast beam Cast insitu concrete Cast insitu concrete Plan view Precast column Cast insitu concrete 1 dowel O20 bolted Cast insitu concrete 1 dowel O20 bolted 60 Precast beam Precast beam Protruding bars from the beam 4O12 Protruding bars from the column 4O12 Protruding bars from the beam 4O12 Protruding bars from the column 4O12 60 Section 1-1

7 Pure shear tests at NTUA

8 Experimental setup for pure shear tests SPECIAL APPARATUS FOR UNIAXIAL APPLICATION OF FORCE TEST SPECIMEN JACK REA ACTION WALL FASTENING MECHANISM

9 Experimental setup for pure shear tests

10 Reinforcement of specimens Concrete: C30/37 Steel: S500

11 Reinforcement of specimens column beam

12 Test program dowels d Excitation 2 Ø Ø Push Pull Cyclic 2 Push Pull Cyclic 2 Push Pull Cyclic 2 Push Pull Cyclic Pull Cyclic Pull Cyclic 2 Ø Pull 1 Ø Ø Ø Ø anch. plate Cyclic d Green: done Blue: ongoing

13 Monotonic PUSH -PULL: 2 25, d = 10 cm

14 Monotonic PUSH -PULL: 2 25, d = 10 cm

15 Monotonic PUSH -PULL: 2 25 vs1 25

16 Comparison with analytical expressions 2 dowels 25, d = 10 cm: F max (push) 470 kn, F max (pull) 230 kn Shear failure of dowel F vr = 1 3 f yd A Compression of concrete V ud,b = γ m A s s F vr = = kn f cd f Concrete cone splitting yd 1/ lb 3 / 2 Vud,c = db fcd cp γ c d b Push: V ud,c = = kn Pull: V ud,c = = kn Tassios(1985) and Greek Precast Code D 2 u, d = δ Φ fck fs y V ud,b = = kn D u,d = = kn

17 Observed damage: monotonic PUSH Spallingof cover concrete at beam Spallingof cover concrete at column Cracks around dowel

18 Observed damage: monotonic PULL AT SMALL DISPLACEMENT DIRECTION OF MOTION Spallingof cover concrete at beam

19 Observed damage: monotonic PULL AT LARGE DISPLACEMENT Destruction of the dowel duct and the grouting at beam Spallingof concrete at column

20 Observed damage: monotonic PULL Dowels are restrained by lower hook.

21 Observed damage

22 Cyclic tests: Loading protocol Velocity = 0.2 mm/s 60 8 d y 40 6 d y ent (mm) Displacem 20 2 d y 1 d y d y 4 d y Time (sec)

23 Cyclic tests: 2 25, d = 10 cm

24 Cyclic tests: 2 25, d = 10 cm

25 Cyclic tests: 2 25, d = 10 cm

26 Cyclic tests: 2 25 vs1 25

27 Future tests: Bending & Shear Aims and Restrictions Formation of plastic hinge at bottom of column, in order to check q-factorand ductility. However, this reduces the forces that are developed at the joint. Development of large displacements and rotations at joint, in order to check its behavior. Restrain forces and overturning moments within the shaking table capacity. SHAKE TABLE

28 Bending & Shear: Experimental setup

29 Bending & Shear: Experimental setup

30 SAFECAST PERFORMANCE OF INNOVATIVE MECHANICAL CONNECTIONS IN PRECAST BUILDING STRUCTURES UNDER SEISMIC CONDITIONS Grant agreement number: Project Coordinator: Dr Antonella Colombo ASSOBETON

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