关于城市桥梁在8度强震区的抗震设计讨论

为了研究一般跨径城市桥梁在8度地震区的抗震设计方法,文章以具体工程为例,采用规范推荐的参数和公式,拟合出场地在E1和E2作用下水平地震动反应谱;通过有限元建模分析,对规范推荐的延性抗震体系和减隔震体系做了详细的计算和分析,研究结果标明:两种抗震体系均能满足相关规范的设计要求;但是减隔震体系在设计阶段造价更低,震后修复费用也较小,在经济性方面有较大的优势。

Study on Aseismic Design of Urban Bridges in 8-degree Strong Earthquake Zone

In order to study the seismic design method of general span urban bridges in 8-degree earthquake zone,the paper takes the concrete project as an example,and uses the parameters and formulas recommended by the specification,to fit the horizontal seismic response spectrum of the site under E1 and E2. Through the finite element modeling analysis,the analysis and calculation of ductile seismic system and reduced isolation system recommended by specification are completed. Both seismic systems can meet the design requirements of relevant specification. However,the cost of seismic isolation system is lower in the design stage,and the cost of post-earthquake repair is smaller,so it has a greater advantage in economy.