The assessment of box girder diaphragms with weak welds Case Study box girder crossheads on viaduct structures nonlinear yield check analysis strengthening work proved unnecessary by LUSAS The Midland Links Viaducts carry the M5 and M6 Motorways around Birmingham. A number of spans are supported on steel box girder crossheads and contain strengthening details, added in the period following publication of the Merrison Report, which are not easily amenable to assessment using codi?ed methods. Maunsell Ltd have undertaken detailed nonlinear analysis using LUSAS Bridge, and have proved the integrity of thediaphragms at the ultimate limit state. Initial hand calculations to the methods in BS 5400 Part 3 indicated that panels within the support diaphragms of these box girders would yield below u

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