求翻译：，首先叙述了桥梁抗震设计这一论题的研究背景及意义，着重从桥梁抗震设计的基本思想、设计地震动、地震分析和计算方法、混凝土结构设计和约束减隔震耗能设计几个核心方面讨论了国内外研究现状。是什么意思？

First describes the background and significance of the bridge seismic design topics, focus on the basic idea of ​​the bridge seismic design, design ground motion, seismic analysis and calculation methods, design of concrete structures and constraints less energy-consuming isolation design several co

First, the bridge described in this topic earthquake-resistant design of the research background and significance, and focus on earthquake-resistant design of the bridge from basic concepts, design, vibration analysis and calculations, seismic methods, concrete structures designed and bound energy V

First narrated the bridge earthquake resistance to design this thesis the research background and the significance, emphatically from the bridge earthquake resistance design basic thought, the design seismic motion, the earthquake analysis and the computational method, the concrete structure design

First account of bridge seismic design background and significance of the topic, focusing on the basic thought and design of bridge seismic design analysis and calculation of vibration, seismic isolation methods, design of concrete structures and constraints present situation of research on energy d

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