3D large scale dynamic tests on precast cladding panel to column connections
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1 SAFECAST Project General 3D large scale dynamic tests on precast cladding panel to column connections Key results Rupture of the connection. First test out of plane test (example) Rupture of the connection
2 SAFECAST Project 3D large scale dynamic tests on precast cladding panel to column connections Key results Failure of the connection. First test out of plane test (example)
3 SAFECAST Project 3D large scale dynamic tests on precast cladding panel to column connections Key results Damage observation Rupture of the connection
4 SAFECAST Project 3D large scale dynamic tests on precast cladding panel to column connections Key results Damage observation Figure 84: Cracks near the connections Spalling of concrete cover and opening of the Cast-In Channels
5 SAFECAST Project 3D large scale dynamic tests on precast cladding panel to column connections Key results Damage observation Cracks in the surrounding concrete
6 SAFECAST Project 3D large scale dynamic tests on precast cladding panel to column connections Conclusions The first steel angles used in the connections (ST37) due to their manufacturing process, that include bending and galvanization, do not result in a very resistant and ductile steel element. The bending process introduces internal stresses and galvanization makes the steel even more fragile. The galvanized hot formed steel plates where no galvanization and no bending (no induced tensions in the bent zone) was applied, so it did not decrease the steel properties. The failure of the connection at the central level of the structure was due to gravity loads distribution along the panels.
7 SAFECAST Project 3D large scale dynamic tests on precast cladding panel to column connections Conclusions The seismic performance of the connection of the cladding panels improves with the installation method (better fastening of the connection, type of steel angle, position of the connection). The channels opened so they are not able to resist to these load values. The spalling of the concrete at the corner of the column is due to the distance of the channel to the edge that is less than required (100mm). Results confirm the high influence of cladding systems upon the building seismic performance.
8 SAFECAST Project Introduction The purpose of these tests is to assess the seismic performance of innovative slab-column emulative connections Two different types of emulative connections were chosen to be tested: KAPTOR connectors (from Ruredil) HALFEN connectors (from Halfen) These slab-column connections are complemented with dowels and in-situ grouting The models are real scale slab-column subassemblies with one bay and one storey
9 SAFECAST Project General view of the model 0.4m thick 1.5m depth 5.11m span Pinned connection to the reaction wall Footing fixed to the shaking table 3.4m height
10 SAFECAST Project Description of the tests Cracking of the Two types of tests are to be carried outer out: side of the cantilever Monotonic tests with a maximum displacement of about 380mm which corresponds to a column drift of more than 10% Cyclic tests with increasing levels of displacement according to the established testing protocol The testing setup includes the combination of the large 3D shaking for imposing horizontal displacements at the base of the column with horizontal and vertical forces applied by a reaction wall
11 SAFECAST Project Testing setup Horizontal and vertical forces applied by the reaction wall Horizontal displacements imposed in the shaking table
12 SAFECAST Project KAPTOR connections The first model to be tested has KAPTOR connectors Bottom connection, column side
13 SAFECAST Project KAPTOR connections Top connection, slab side Top connection, column side
14 SAFECAST Project KAPTOR connections 4 x 1 bolts (12.9 steel) for bottom connection 5 x 1⅛ bolts (12.9 steel) for top connection
15 SAFECAST Project KAPTOR connections Aspect of the slab-column connection after grouting
16 SAFECAST Project Instrumentation plan Cracking of the The instrumentation plan includes outer the side measurement of of: the cantilever displacements in the slab-column connection with a dense array of sensors in order to capture the discrete body kinematics displacements along the span of the slab and the height of the column with a sparse distribution of sensors to obtain the respective deformed shapes forces in the hinged struts connecting the slab to the reaction wall This instrumentation plan will allow to determine the Force- Displacement and the Moment-Rotation curves that characterize the behavior of the connections and the performance of the sub-assemblage
17 SAFECAST Project Detail of the connection to the reaction wall Forces are measured independently on four load cells placed one on each hinged strut 0.89m 0.9m
18 SAFECAST Project Testing plan Cracking of the The connection elements (KAPTOR outer and side HALFEN) of were received by ANIPB near the end the of cantilever 2011 Four models were built by Concremat and were ready to test by mid January Previous commitments with other research projects prevented LNEC from carrying the tests until now The first test (monotonic) with the KAPTOR connectors has been under preparation since last week and is being carried out today The second test (cyclic) with the KAPTOR connectors will be carried out immediately after as well as the other two with the HALFEN connectors
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