Axial Strain Measurement on Tension Rods of Architectural Structures

Tension rods are one of the key components used in the architectural and engineering design of an aseismic reinforcement structure, bridges and buildings. They are used as the means of transferring large forces over long distances in the structures. They work at high proportions of their tensile strength to keep the structure intact. However, a single failure on one of the connectors can raise the possibility of a potential collapse. These failures can be attributed to factors such as material quality, dimensional inaccuracy or misalignment of end connections causing sensitivity to the secondary stresses.

In order to measure the axial strain of tension rod used in aseismic reinforcement structure or in a steel frame structure, a frictional type Axial Strain Transducer is used. Unlike the conventional strain measurement system that uses adhesive layers to pick strain on a structure, a frictional strain transducer measures the axial strain of tension rod used by picking up strain through friction. This is achieved with the help of frictional strain gauges that are integrated in the strain transducer. These strain gauges down the strain sensing element on the structure with the magnet to acquire the strain measurement. For this application, FGAH-1B-R and FGAH-1B-H frictional axial strain transducers by TML are available that can be installed on a rod having a round-shaped or hexagonal cross-section. They are compact in size and their light construction allows installation in narrow spaces too. Another advantage of using these transducers is that they can be used repeatedly.