独塔斜拉桥模型地震模拟振动台台阵试验
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摘要
为了研究独塔斜拉桥在强震作用下的地震响应特性,设计制作缩尺比例为1∶30的半漂浮体系独塔斜拉桥结构模型,进行不同地震动作用下多点激励的地震模拟振动台试验.研究结果表明:支座破坏是半漂浮体系独塔斜拉桥缩尺模型在强震作用下的一种主要破坏模式;与只考虑单向水平地震波的情况相比,考虑双向水平地震波同时作用对半漂浮体系独塔斜拉桥的加速度响应影响显著,而对动位移响应的影响较小;在双向水平地震波作用下,主梁跨中会发生不可忽略的竖向加速度响应,卓越周期较长的地震波对半漂浮体系独塔结合梁斜拉桥缩尺模型更具破坏性,强震下斜拉索要承受远大于初始索力的瞬时索力.
In order to study the seismic characteristics of cable-stayed bridge with single tower,a 1∶30 scaled model of a semi-floating composite cable-stayed bridge was designed and tested on the shaking tables under multi-support excitations with different strong earthquake waves. The results showthat the bearing damage and failure is one of the main failure modes of the semi-floating composite cable-stayed bridge model under strong earthquake loading. Compared with the case only considering unidirectional horizontal seismic waves,the acceleration responses of the cable-stayed bridge model with the semi-floating system are more affected under the bidirectional horizontal earthquake excitations,but the effect on the dynamic displacement response is less. Under the bidirectional horizontal earthquake excitations,the vertical acceleration at the middle-span of the main girder cannot be ignored. The cable-stayed bridge model with the semi-floating system is more severely damaged under the earthquake waves with the longer predominant period. M eanwhile,the transient forces of the cables are far greater than the initial cable forces.
In order to study the seismic characteristics of cable-stayed bridge with single tower,a 1∶30 scaled model of a semi-floating composite cable-stayed bridge was designed and tested on the shaking tables under multi-support excitations with different strong earthquake waves. The results showthat the bearing damage and failure is one of the main failure modes of the semi-floating composite cable-stayed bridge model under strong earthquake loading. Compared with the case only considering unidirectional horizontal seismic waves,the acceleration responses of the cable-stayed bridge model with the semi-floating system are more affected under the bidirectional horizontal earthquake excitations,but the effect on the dynamic displacement response is less. Under the bidirectional horizontal earthquake excitations,the vertical acceleration at the middle-span of the main girder cannot be ignored. The cable-stayed bridge model with the semi-floating system is more severely damaged under the earthquake waves with the longer predominant period. M eanwhile,the transient forces of the cables are far greater than the initial cable forces.
引文
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[11]房贞政,张超,陈永建,等.基于三台阵振动台的多塔斜拉桥试验研究[J].土木工程学报,2012,45(S1):25-29.Fang Zhenzheng,Zhang Chao,Chen Yongjian,et al.Research on the shaking table test of three tow ers cable-stayed bridge based on three shaking table system[J].China Civil Engineering Journal,2012,45(S1):25-29.(in Chinese)
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[2]交通部公路规划设计院.JTJ 004—89公路工程抗震设计规范[S].北京:人民交通出版社,1990.
[3]中华人民共和国交通运输部.JTG/T B02-01—2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.
[4]Ren W X,Obata M.Elastic-plastic seismic behavior of long span cable-stayed bridges[J].Journal of Bridge Engineering,1999,4(3):194-203.
[5]Mylonakis G,Papastamatiou D,Psycharis J,et al.Simplified modeling of bridge response on soft soil to non-uniform seismic excitation[J].Journal of Bridge Engineering,2001,6(6):587-597.
[6]Kawashima K,Unjoh S,Tunomoto M.Estimation of damping ratio of cable-stayed bridges for seismic design[J].Journal of Structural Engineering,1993,119(4):1015-1031.
[7]Shoji G,Kitahara J,Kojima A,et al.Mechanism of seismic response of a PC cable-stayed bridge subject to a long-period seismic excitation[J].Doboku G akkai Ronbunshuu A,2008,64(4):982-1001.
[8]宗周红,陈亮,黄福云.地震模拟振动台台阵试验技术研究及应用[J].结构工程师,2011,27(S):6-14.Zong Zhouhong,Chen Liang,Huang Fuyun.Research and application of testing technology of the earthquake simulation multiple shaking table facilities[J].Structurla Engineers,2011,27(S):6-14.(in Chinese)
[9]黄宝锋,卢文胜,宗周红,地震模拟振动台阵系统模型试验方法探讨[J].土木工程学报,2008,41(3):46-52.Huang Baofeng,Lu Wensheng,Zong Zhouhong.Study on model experimental methodology utilizing the multiple earthquake simulation shake table system[J].China Civil Engineering Journal,2008,41(3):46-52.(in Chinese)
[10]高文军,唐光武,黄福伟,等.厦漳跨海大桥北汊主桥振动台试验研究[J].桥梁建设,2012,43(4):7-13.Gao Wenjun,Tang Guangw u,Huang Fuw ei,et al.Shaking table test study of north main bridge of Xiazhang Sea-crossing Bridge[J].Bridge Construction,2012,43(4):7-13.(in Chinese)
[11]房贞政,张超,陈永建,等.基于三台阵振动台的多塔斜拉桥试验研究[J].土木工程学报,2012,45(S1):25-29.Fang Zhenzheng,Zhang Chao,Chen Yongjian,et al.Research on the shaking table test of three tow ers cable-stayed bridge based on three shaking table system[J].China Civil Engineering Journal,2012,45(S1):25-29.(in Chinese)
[12]Okamoto Y,Nakamura S.Static and seismic studies on steel/concrete hybrid tow ers for multi-span cablestayed bridges[J].Journal of Constructional Steel Research,2011,67(2):203-210.
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