dition and the placing of the couplers, variants 2 and 3 result in symmetric displacements, namely w1ðL;tÞ for variant 1 is the
same as w2ðL;tÞ for variant 2 and w2ðL;tÞ for variant 1 is the same as w1ðL;tÞ for variant 2. As a result both cases have the
same energy J (see Fig. 16). After 60 s of simulation, the acceleration levels w€ 1ðL;tÞ and w€ 2ðL;tÞ for variant 1 (both couplers
with fixed stiffness) were reduced from an initial peak of 4:1 m=s2 to 1:95 m=s2, which is almost a 53 percent drop
(Figs. 14 and 15). When the controlled coupling was performed, the accelerations were significantly reduced. For the most
efficient variant 4 (both couplers controlled), the initial peak accelerations were reduced by 97 percent of the first peak for
the upper and lower beam.