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钢-混工字组合连续梁桥地震易损性及其影响参数分析

Analysis of influence parameters on seismic vulnerability of steel-concrete I-beam composite continuous girder bridge

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以一座 3×40m钢-混工字组合连续梁桥为依托,通过SAP2000 建立不同墩高、不同上部结构荷载及不同上部主梁截面等全桥非线性有限元模型.选取峰值地面加速度(PGA)作为地震动强度参数,以桥墩位移延性比为损伤指标确定了完全破坏、严重破坏、中等破坏、轻微破坏、基本完好等 5 种结构破坏状态,分析了不同PGA作用下的桥墩易损性.研究结果表明:对于钢-混工字组合连续梁桥,相同桥墩截面尺寸、同一峰值地面加速度(PGA)下,桥墩高度越高,各个破坏状态的超越概率越小,其破坏风险越小;在合理的上部结构设计前提下,增加上部结构荷载,会降低桥墩的抗震性能;相同的下部结构布置,上部主梁采用钢-混组合结构,其桥墩易损性破坏概率要比同跨径的钢筋混凝土T型梁桥小,抗震性能更优越.建议桥梁抗震设计时重点关注上述因素的影响.
Based on a 3×40m steel-concrete I-beam composite continuous girder bridge,a full bridge nonlinear finite element model with different pier heights,different superstructure weights and different bridge section was established by SAP2000.Peak ground acceleration(PGA)was selected as the ground vibration strength parameter,and bridge pier displacement ductility ratio was used as the damage index to determine five structural damage states,such as complete damage,severe damage,moderate damage,slight damage,and basic intact,etc.The vulnerability of bridge piers under the action of different PGA was analyzed.The results show that for steel-concrete I-beam composite continuous girder bridge,the same bridge pier cross-section size,the same peak ground acceleration(PGA),the higher the height of the bridge pier,the smaller the probability of exceeding each damage state,the smaller the risk of damage.Increasing the superstructure load under the premise of reasonable superstructure design will reduce the seismic performance of bridge piers.The same substructure arrangement,the upper main girders using steel-concrete combination structure,its bridge pier vulnerability damage probability is smaller than the same span reinforced concrete T-girder bridge,seismic performance is better.It is suggested that the influence of the above factors should be paid attention to in seismic design of bridges.

steel-concrete I-beam composite continuous girder bridgepeak ground accelerationpier vertical pressuredisplacement ductility ratioseismic vulnerabilitydamage state

王荣霞、李军、万田宝、张蒙、董天啸

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河北工业大学土木与交通学院,天津 300401

河北迁曹高速公路开发有限公司,唐山 063700

河北省高速公路延崇管理中心,张家口 075000

钢-混工字组合连续梁桥 峰值地面加速度 桥墩竖向压力 位移延性比 地震易损性 破坏状态

国家自然科学基金河北省交通厅科技项目

51778206QC2018-7

2024

10.19701/j.jzjg.LS210373

建筑结构
中国建筑设计研究院 亚太建设科技信息研究院 中国土木工程学会

建筑结构

CSTPCD北大核心
影响因子：0.723
ISSN：1002-848X
年,卷(期)：2024.54(1)
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