Moment frames

▲ 12.16 An external steel moment frame retrofit, Wellington.

A 1950s reinforced concrete frame building - strengthened by the addition of new steel moment frames - is illustrated in Fig. 12.16 . Located at the rear of the building, the new frame connects to the existing construction by grouted-in bolts at every floor. On-site bolted joints at the mid-span of beams where no bending moments occur during an earthquake are visible. A similar frame is inserted inside the front façade at the other end of the building. New reinforced concrete frames provide lengthwise stability for the building shown in Fig. 12.17 . During the retrofit, the existing exterior columns were transformed by the layering of vertical slabs to form new moment frame columns.15 New beams that also function as balustrades at every alternate storey form a moment mega-frame. Although prior to the retrofit every balcony slab had a transparent metal balustrade this scheme is a good example of an architecturally well-integrated retrofit. On the same campus another moment frame retrofit also respects, if not improves upon, the existing architecture (Fig. 12.18).

▲ 12.16 An external steel moment frame retrofit, Wellington.

▲ 12.17 New exterior columns and beams form a double-height moment mega-frame, Berkeley, California.

▲ 12.18 A retrofit solution consisting of exterior moment frames. The surface markings identify remedial work to surface coatings, Berkeley, California.

▲ 12.17 New exterior columns and beams form a double-height moment mega-frame, Berkeley, California.

▲ 12.18 A retrofit solution consisting of exterior moment frames. The surface markings identify remedial work to surface coatings, Berkeley, California.

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