Chief executive John Varley has outlined measures in a letter to staff following threats of strike action and protests.
Varley has also offered to delay the implementation of the proposed changes by four months to April 2010.
Money Marketing reported last month that Barclays staff were considering strike action in September after the bank announced the final salary scheme would close to future accruals.
Unite, the trade union, said Barclays members were “incensed” by the proposals, adding that 92 per cent of staff wanted to be balloted by Unite on industrial action.
Barclays said the closure of the scheme was necessary as the pension scheme had become untenable after its £200m surplus ballooned into a £2.2bn deficit in a year.