为解决高墩大跨连续梁桥减隔震设计中存在墩底内力与梁端位移矛盾的问题，基于撑架连续梁结构特点和耗能减震思想提出了一种摩擦摆支座和撑架相结合的墩底内力、梁端位移双控的减隔震体系。推导了撑架结构等效阻尼比的计算公式，对比研究了4种减隔震方案的地震响应，验证了摩擦摆和撑架组合使用的优越性，并对撑架结构进行了参数分析，还分析了附加撑架结构在静力方面的优势。结果表明：在撑架等效阻尼比为9%时，静力方面连续梁支点负弯矩减小27%；动力方面墩底弯矩最大减震率为79%，墩底剪力最大减震率为83%，梁端位移最大减震率为50%。说明摩擦摆支座和撑架的组合使用，可实现墩底截面内力和梁端位移的有效控制，降低大跨连续梁的静力和动力响应。
Abstract
In order to solve the problem that the contradiction between pier bottom internal force and girder displacement in the seismic isolation design of continuous bridges with high pier and long span, a seismic isolation system by combining friction pendulum system and brace is proposed based on the structural characteristics of braced-continuous bridge and the idea of energy dissipation, which can realize the double control of pier bottom internal forces and girder displacement. The equivalent damping ratio calculation formula of the brace is derived and the superiority of the combined use of friction pendulum system and brace is verified by contrastively investigating the seismic response of four isolation case. Finally, parameter analysis is carried out for brace, and the advantages in statics of the additional brace are also analyzed. The study results show that the equivalent damping ratio of the brace is 9%, the hogging moment of the fulcrum of the continuous bridge in the static aspect is reduced by 27%, the maximum reduction rate of the pier bottom moment is 79%, the maximum reduction rate of the pier bottom shear force is 83%, and the maximum reduction rate of the girder displacement is 50%. The combined use of friction pendulum system and brace can restrict pier bottom bending moment and girder displacement, and reduce the static and dynamic response of large span continuous bridges effectively.
关键词
连续梁桥 /
高墩大跨 /
内力位移双控 /
减隔震
{{custom_keyword}} /
Key words
continuous bridges /
high pier and long span /
double control of force and displacement /
seismic isolation
{{custom_keyword}} /
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 石 岩，王东升，韩建平，等. 桥梁减隔震技术的应用现状与发展趋势[J]. 地震工程与工程振动, 2017, 37(5):118-128.
SHI Yan, WANG Dongsheng, HAN Jianping,et al. Application status of seismic isolation for bridges and its development tendecy[J]. Earthquake Engineering and Engineering Dynamics, 2017, 37(5): 118-128.
[2] 方 蓉，康路明，张文学，等. 自复位摩擦耗能支座减隔震机理及试验研究[J]. 振动与冲击, 2021, 40(23):83-90.
FANG Rong, KANG Luming, ZHANG Wenxue,et al. Seismic reduction and isolation mechanism and tests for self-reset and friction energy-dissipating pedestal[J]. Journal of vibration and shock, 2021, 40(23): 83-90.
[3] BILLAH A H M M, Todorov B. Effects of subfreezing temperature on the seismic response of lead rubber bearing isolated bridge[J]. Soil Dynamics and Earthquake Engineering, 2019, 126: 105814.
[4] CHEN X, LI C X. Seismic performance of tall pier bridges retrofitted with lead rubber bearings and rocking foundation[J]. Engineering Structures, 2020, 212: 110529.
[5] CHEN X, WU P S, LI C X. Seismic performance assessment of base-isolated tall pier bridges using friction pendulum bearings achieving resilient design[J]. Structures, 2022, 38: 618-629.
[6] MORONI M O, BOROSCHEK R, SARRAZIN M. Dynamic characteristics of Chilean bridges with seismic protection[J]. Journal of Bridge Engineering, 2005, 10(2): 124-132.
[7] ROBERTS J E. Caltrans structural control for bridges in high-seismic zones[J]. Earthquake Engineering & Structural Dynamics, 2005, 34(4-5): 449–470.
[8] LI Z, LI D J, PENG L H, et al. Study on the damping efficiency of continuous beam bridge with constant cross-section applied by lead rubber bearings and fluid viscous dampers[J]. Noise & Vibration Worldwide, 2020, 51(4-5): 85–92.
[9] 鲁传安，胡世德，叶爱君. 强震区大跨高墩连续梁桥抗震性能研究[J]. 结构工程师, 2007, 23(6): 56-61.
LU Chuanan, HU Shide, YE Aijun. Study on seismic performance for long span and high pier continuing girder bridges in severe earthquake region[J]. Structual Engineers, 2007, 23(6): 56-61.
[10] QU Z, ZHU B J, CAO Y T, et al. Rapid report of seismic damage to buildings in the 2022 M6.8 Luding earthquake, China[J]. Earthquake Research Advances, 2022, 100180.
[11] ZHANG J P, LIU A R, WU G, et al. Study on operating vehicle load limit of sub-health bridge[J]. Advanced Materials Research, 2011, 163: 3369-3375.
[12] GB 50011-2001 建筑抗震设计规范[S]. 北京：中国建筑工业出版社，2001.
GB 50011-2001 Code for seismic design of buildings[S]. Beijing: China Architecture & Building Press, 2001.
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}
PDF(1369 KB)
