基于反应谱设计的公路桥梁抗震性能研究

Study on Seismic Performance of Highway Bridge Based on Response Spectrum Design

摘要:

《公路桥梁抗震设计规范》（JTG/T2231-01—2020）、《公路工程抗震规范》（JTG B02—2013）、《公路桥梁抗震设计细则》（JTG/B02-01—2008）、《城市桥梁抗震设计规范》（CJJ 166—2011）为高速公路桥梁设计的主要参考规范，但其在反应谱曲线定义公式、参数取值和强度验算相对安全性上存在差异。通过工程案例，分析各规范在E1、E2地震水平下的地震动输入水平，评估强度验算时各规范的相对安全性。研究表明：在E1、E2地震水平下，《公路桥梁抗震设计规范》反应谱曲线数值高于《公路工程抗震规范》《公路桥梁抗震设计细则》和《城市桥梁抗震设计规范》。规范均采用极限状态设计法，以M-?曲线作为强度验算指标。采用《公路工程抗震规范》荷载组合方式，结构强度验算结果相对安全性更高。

Abstract:

The Code for Seismic Design of Highway Bridges, Code for Seismic Resistance of Highway Engineering, Detailed Rules for Seismic Design of Highway Bridges and Code for Seismic Design of Urban Bridges are the main reference specifications for the design of expressway bridges. However, there are differences in the definition formula of the reaction spectrum curve, the parameter values, and the relative safety of intensity verification. Through an engineering case, the ground motion input level of each code at the level of E1 and E2 earthquake is analyzed, and the relative safety of each code is evaluated. The study shows that under the E1 and E2 seismic level, the response spectrum curve value of Code for Seismic Design of Highway Bridges is higher than that of Code for Seismic Resistance of Highway Engineering, Detailed Rules for Seismic Design of Highway Bridges and Code for Seismic Design of Urban Bridges. All the specifications adopt the limit state design method, and the M-? curve is used as the strength verification index. The load combination method of Code for Seismic Design of Highway Engineering is adopted, and the results of structural strength verification are relatively safer.