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I had this project where a 10 metre I-beam (UB 762x267X197 kg/m) was designed to carry a 5Ton crane girder. I have designed the I-beam based on BS5950. I have factored the load to account for the dynamic effect, includes transverse load effect, moving load effect and a unrestraint length of 10 metres. However soon after the installation of the crane, when the crane moves, it creates loud noises. The crane supplier have blame it on the underdesign of the I-beam. And now the owner is going to sue us. Can someone advice if the I-beam is adequate for the intended usage or has it been underdesigned. Appreciate your response.