The study is aimed to evaluate the influence of the construction quality on the buckling load aswell as on the bearing capacity of the real sub-structural system provided in order to keep thecantilever moment to a reasonable magnitude, during continuous post-tensioned multi-span bridgecasting. The clamping bolt quality as well as the stiffness of the flanged joint of the two steel trusspiers, which had collapsed during the "Porcaria bridge" construction, are studied. At first, somelaboratory tests were carried out on flanged joint specimens. Later, a numerical investigation wascarried out on the real model of the towers by varying the quality of the clamping bolt. The dataobtained show how the buckling load is highly influenced by the correct erecting of the tower. Infact, a lower stiffness of the flanged link or an insufficient clamping bolt might produce safetycoefficient lower than unity. Besides, the perfect accordance between numerical and experimentalinvestigation gave us the possibility of a more accurate design of the temporary towers.
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