【摘要】 采用能量原理建立了能考虑梁薄壁特性的桥梁上部结构梁段单元动力分析模型,利用非线性接触单元Kelvin碰撞模型,考虑非线性支座的滞回特性(采用W en模型),选择适合不同场地条件的地震波,以京港澳高速公路孟姜女河桥(3跨简支梁桥)为例,进行了桥梁结构纵向碰撞非线性地震响应分析。计算结果表明,随着地震波强度的增加,桥梁上部结构碰撞次数明显增加,结构响应峰值均有所增大;跨间碰撞发生对地震响应值影响较大;伸缩缝间距大小及各跨长度比变化对跨间碰撞效应影响很大;结构碰撞响应对输入地震波具有较强的频谱敏感性;桥梁碰撞计算时桥台铅芯橡胶支座不能简单按简支约束处理。所得结论可供桥梁抗震设计参考。更多还原

【Abstract】 Based on the energy principle,the thin-wall beam element of bridge superstructure is established.According to Kelvin contact model,under the consideration of nonlinear bearing hysteretic characteristics(Wen model) and the waves for various site conditions,the longitudinal seismic pounding response of three span simple beam bridge of Jinggangao motorway is studied.The calculation results show that the pounding times and response peak values of the bridge superstructure are increased obviously with augmenting peak accelerations.The joint pounding affects the seismic responses,and the clearance of expansion joint and the span ratio affects the pounding response a lot.The pounding response is sensitive to the frequency spectra of the seismic waves.The pounding calculation with abutment lead-rubber bearing should not be simulated as simple support beam.The results provide references for the seismic design of bridges.更多还原