Three partial arches — two large, one small — that assemble into a
symmetrical or
asymmetrical three-hinged arch, or into a single cantilever beam for comparison. The crown hinge makes the structure statically determinate, so support reactions can be derived from equilibrium alone and then compared directly against measurement. One arch segment is instrumented with a force module, from which the Sangari software reconstructs the bending-moment distribution in real time. Together with the
ST501 supports on the
ST500 frame, the stand covers the classical questions of horizontal thrust, influence lines and the effect of a moving load.
