Environmental Engineering Reference
In-Depth Information
Fig. 13.4
Detail of the base of the mock-up structure
online, by considering the reciprocal position of cylindrical hinge, dissipators, and
springs (Fig.
13.4
). Two load cells mounted under each MR device allowed to
measure the reacting forces (AMTI load cells, model MC5-5000, range ±22 kN).
It is worth noting that base stress and top displacement have been calculated online
from the above-mentioned available displacement measures, being the stress of
steel well below the yielding value.
The
additional
electronic
equipment
used
to
drive
the
SA
tests
include
(Fig.
13.6
):
1. No. 2 power supplies type BOP (Bipolar Power Supply) provided by Kepco
Inc. (New York, USA), model 50-4 M, maximum power output of 200 W,
maximum input power of 450 W, power source-power sink capabilities in the
range ±50 V (voltage) and ±4 A (current); commanded from a remote
location (PC) through a voltage signal in the range 0-10 V, with alternative
operations as voltage driver (control loop gain 5.0 V/V) or as current driver
(control loop gain 0.4 A/V);
2. No.
1
embedded
controller
National
Instruments
PXI-8196
RT,
high-
performance platform for testing in real time;
