ABAQUS
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我用abaqus建了一个地铁车站的模型,有土体,进行抗震分析,用动力隐式分析出现Global mass matrix is singular. Please specify proper material densities, concentrated masses and rotary inertias, or nonstructural mass to fix the mass matrix. As a workaround, *dynamic, singular mass=warning can be used.的错误,想请教大神们如何解决,好着急啊