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  李琛,徐文平,孟宪锋,赵国辉,李宇.双向近场地震作用下HDR隔震梁桥地震响应研究[J].震灾防御技术,2020,15(1):67-76, DOI:10.11899/zzfy20200107.

双向近场地震作用下HDR隔震梁桥地震响应研究
摘要:    以HDR隔震梁桥多自由度(MDOF)模型和等效双线性单自由度(SDOF)模型为研究对象,以典型近场地震动作为输入,研究HDR支座双向耦合效应对HDR隔震梁桥地震响应的影响。研究结果表明:不考虑双向耦合效应的HDR支座滞回曲线呈典型双线性;考虑双向耦合效应的HDR支座滞回曲线面积小于不考虑双向耦合效应的HDR支座滞回曲线面积。不考虑双向耦合效应的顺桥向HDR支座位移峰值db大于考虑双向耦合效应时,但横桥向的结果相反。近场地震作用下,对梁桥进行HDR支座隔震设计时,忽略双向耦合效应计算得到的墩底剪力峰值和弯矩峰值均偏于保守。可忽略HDR支座双向耦合效应对HDR隔震梁桥近场地震能量的影响。
作者单位
李琛 长安大学建筑学院, 西安 710064 
徐文平 长安大学公路学院, 西安 710064 
孟宪锋 中国民航机场建设集团有限公司, 北京 100101 
赵国辉 长安大学公路学院, 西安 710064 
李宇 长安大学公路学院, 西安 710064 
关  键  词:近场地震动  隔震梁桥  高阻尼橡胶支座  双向耦合效应  滞回曲线
DOI:10.11899/zzfy20200107
基金项目:国家自然科学基金资助项目(51408042);陕西省自然科学基础研究计划面上项目(2018JM5114);长安大学中央高校基本科研业务费专项资金资助(300102219212);云南省交通运输厅科技项目(云交科教〔2018〕13号)
收稿日期:2019-06-12
作者简介:李琛,女,生于1986年。讲师。研究方向为建筑设计。E-mail:306387188@qq.com
通讯作者:
Seismic Response of Seismic Isolated Beam Bridge with HDR Bearing under Bilateral Near-field Ground Motions
Abstract:      The effect of the bidirectional coupling effect of the HDR bearing on the seismic response of the seismic isolated beam bridge (SIBB) is studied by inputting the typical near-field ground motions into the multi-degree-of-freedom model and equivalent bilinear single-degree-of-freedom system of the SIBB with the HDR bearing. The main conclusions are as follows: the hysteretic curve of the HDR bearing is typical bilinear without considering the bidirectional coupling effect; the area of the hysteretic curve of the HDR bearing considering bidirectional coupling effect is smaller than that of the HDR bearing without considering bidirectional coupling effect; in the longitudinal direction, the peak displacement of the HDR bearing without considering the bidirectional coupling effect is larger than that of the HDR bearing with considering the bidirectional coupling effect, but the results are opposite in the transverse direction; when the seismic isolated design with the HDR bearing is done for beam bridges under near-field ground motions, the peak shear and moment on the bottom of piers are conservative without considering the bidirectional coupling effect; the effect of the bidirectional coupling effect of HDR bearing on the near-field seismic energy response of the SIBB with the HDR bearing can be neglected.
Keywords:  Near-field ground motion  Seismic isolated beam bridge  High damping rubber bearing (HDR bearing)  Bidirectional coupling effect  Hysteretic curve
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