Steel-Concrete Interaction by Means of Film Sensors

by Marco di Prisco, Politecnico di Milano, Milano, Italy,
Alessandro Gandelli, Politecnico di Milano, Milano, Italy,

Document Type: Proceeding Paper

Part of: Structures Congress XII


By adapting a recently-developed technique based on the piezoelectrical properties of relatively thick films made of Polyvinyldifluor organic composites and extensively used in robotics, a new sensor has been developed in order to measure the normal stresses at the steel-concrete interface in various R/C problems. Since the sensor is suitable to measure variable high-frequency loads, all the tests are performed applying dynamic loads with different frequencies. The negligible thickness of the sensor does not modify the mechanical behavior of the interface, as shown by the test results. Though the correlation between the electrical signal and the local pressure has been checked in many tests and the experimental procedure is well established, a few technological problems related to the severe environment are still to be solved in order to make the proposed technique suitable for general use in R/C contact problems. After a concise introduction on the electrical principles, three tests in plane stresses regarding dowels and anchor bolts are presented and discussed.

Subject Headings: Dynamic loads | Load tests | Composite materials | Probe instruments | Material properties | Steel | Material tests

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