Civil Engineering Reference
In-Depth Information
4.6
Methods for Strengthening the Integrity of Masonry Structures
It is indicated from experimental research and project practice that adding reinforced con-
crete constructional columns, ring beams and steel pull rods is quite effective for improving
building integrity. The methods of adding reinforced concrete constructional columns, ring
beams and steel pull rods can be adopted separately, according to the practical situation.
When the original building has no constructional columns, ring beams, or adequate ring
beams, it can be retrofitted by adding the constructional columns, ring beams or steel pull
rods.
When the original building has inadequate ring beams, it can be retrofitted by adding the
ring beams or steel pull rods.
When the original building has adequate ring beams but no constructional columns, it can
be retrofitted by adding constructional columns. Meanwhile, retrofitting must also ensure
the adequate connection strength and ductility between the constructional columns, and
original ring beams or the walls.
When the spacing of the original earthquake-resistant walls is too large, the additional
earthquake-resistant walls can be set up first. And then, the retrofitting method of adding
constructional columns, ring beams and steel pull rods may be considered.
4.6.1
Detailed Requirements of Additional Constructional Columns,
Ring Beams, and Steel Tie Rods
1. Additional constructional columns
(1) Section dimension
In order to ensure the strength of the additional columns and their ability to work with
the walls, their section dimensions and reinforcements may not be less than the values listed
in Table 4.2 and may be designed in accordance with detailed requirements in Fig. 4.12.
Fig. 4.12
(continued)
