Beam-to-column connections have been found to be of great significance in influencing structural behavior at ambient and elevated temperatures. When steel-framed structures are subjected to fire, the load bearing capacity is decreased and the behavior of the joints is of particular concern. Observations from full-scale fire tests and damaged structures confirm that connections have a considerable effect on the stability time of structural components in fire. Due to the high cost of elevated temperature tests, adequate experimental data about a broad range of connections is not available. One type of such connections is the connections between I-shape beam and pipe shape columns in oil platform decks. Considering the high probability of fire in oil platforms, study of the behavior of these connections at elevated temperatures is of great importance. In the current study, a number of experimental tests have been conducted on this connection type to investigate their flexural bahaviour and in particular the bending stiffness of the connection in fire. Effects of the temperature rise on the rotational response of the specimens are studied and the results are presented as temperature-stiffness curves.