The focus of the study is identification of the structure’s longitudinal stiffness and its implementation into the kinematic constraints of the simulation model. The main objective was to achieve a high-fidelity representation of the actual behaviour of connections between pontoon blocks by accounting for both their angular compliance and joint clearance. The model parameters, including the flexural stiffness of a pontoon block, the angular stiffness of block connections, and the limiting hinge-locking angle, were determined from an analysis of experimental results obtained on a full-scale structure. The flexural stiffness of an individual pontoon was identified based on static deflection measurements. The angular stiffness of pontoon connections was determined using experimental data obtained from tests on coupled pontoon segments, with separation of deformation contributions from both the load-bearing structure and the joint components. These parameters were subsequently implemented in a numerical model of the bridge under static loading conditions on a water obstacle. The model was then calibrated by minimizing discrepancies between numerical predictions and experimental results, enabling the identification of the limiting locking angle of the connections. Model accuracy was assessed by comparing vertical displacements of characteristic points obtained in simulations and experiments. The results confirmed that the adopted modelling approach, incorporating the identified equivalent stiffness and joint-clearance parameters, accurately reproduced the experimental bridge response for the analysed static calibration case. Funding: This work was financed by the Military University of Technology under research project UGB 22-104/2026 (531-000104-W100-22).