Structural engineers examining buildings in Washington, D.C., after Tuesday's earthquake say structures in the area "performed exceedingly well" because they adhered to a mix of local and international building codes, according to the General Services Administration. However, things may change. "We anticipate that building codes will now require a higher level of force to be included in the overall seismic design of the buildings," said Jerry Rasgus, head of the D.C. office for Weidlinger Associates, a structural engineering firm.

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