因此，研究掌握大跨桥梁的地震反应是建立合理抗震体系和采取有效抗震措施的科学依据。
Therefore, it is necessary to study and master the seismic response of long span bridges in order to establish reasonable seismic design system and take effective anti-seismic measures.
因此，急需采取紧急而又有效的抗震加固措施。
It is urgent need to take a emergency and effective earthquake-resistant improvement measure.
建议有效控制顶部相对扭转响应并提出了考虑扭转振动效应的抗震措施。
Some Suggestions on seismic design in the light of the response of torsional vibration are presented.
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