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图10-21所示刚架，质量集中在横梁W=49kN，受动力荷载P(t)=P 0 sinθtkN作用，P 0 =10kN，动荷载频率f=2Hz，已知系统阻尼比为ξ=0.05，横梁在水平荷载P=31.4kN作用下能产生y 0 =1cm的侧移。试求动力系数与振幅。
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