600m特大跨径钢筋混凝土拱桥抗震性能研究
发布时间：2018-12-27 09:17
【摘要】：世界各地发生的地震给人类生命财产造成巨大损失。桥梁作为生命线工程,一旦发生地震破坏,给抢险救灾带来严重的阻碍。钢筋混凝土拱桥外形美观,跨越能力强,费用低廉,是山区适宜建造的桥梁结构。至今为止,重庆万州长江大桥仍是世界上跨度最大的钢筋混凝土拱桥。欧美、日本、中国等先后对600m-1000m级特大跨钢筋混凝土拱桥进行了探索性研究。本文以600m钢筋混凝土拱桥为研究对象,基于OpenSEES软件,开展地震响应及抗震性能研究:①针对600m钢筋混凝土拱桥进行试设计研究,建立桥梁结构的线弹性有限元模型、材料非线性模型以及考虑几何非线性的材料非线性模型,依据这三个模型进行动力特性对比研究;在此基础上,选取20条天然地震波在一致激励下施加给结构进行IDA分析,选取其中典型地震波的计算结果对结构的地震响应值进行比较,研究表明材料非线性和几何非线性对600m钢筋混凝土拱桥的内力和位移的响应影响很大。考虑材料非线性后,在纵向+竖向和横向+竖向地震作用下,较弹性模型弯矩最大分别增大了44.1%和84.8%;考虑几何非线性+材料非线性后,在纵向+竖向和横向+竖向地震作用下,较材料非线性模型弯矩最大分别增大了32.5%和4.4%。②考虑材料非线性和几何非线性,研究主拱圈钢筋用量在地震作用下对主拱圈抗震性能的影响。主拱圈在纵向+竖向以及横向+竖向地震动作用下的地震内力响应值和位移响应值加以对比分析,结果表明纵向钢筋用量的改变在主拱圈进入非线性以前影响不大,在主拱圈进入非线性以后才影响较大;而箍筋用量的改变对主拱圈的抗震性能影响很大,进入非线性的地震动峰值加速度发生了很大改变。③针对桥道梁采用连续梁-连续刚构体系(方案A)和设置T构交界墩的连续梁-连续刚构体系(方案B)两种方式,研究在不同桥道梁跨径布置形式下考虑材料非线性和几何非线性后的地震响应分析,对地震峰值加速度分别为0.1g、0.4g、0.8g和1.2g下的地震内力响应和位移响应加以对比分析,得出方案A和方案B的较为合理的试设计方案,在此基础上进一步就试设计方案加以分析比较,得出最优的试设计方案。
[Abstract]:Earthquakes around the world have caused great loss of human life and property. Bridge as a lifeline project, once the earthquake damage, rescue and relief bring serious obstacles. Reinforced concrete arch bridge is a suitable bridge structure in mountainous area because of its beautiful appearance, strong span ability and low cost. Up to now, Wanzhou Yangtze River Bridge in Chongqing is still the longest span reinforced concrete arch bridge in the world. Europe, America, Japan, China and so on have carried on the exploratory research to the 600m-1000m class super-large span reinforced concrete arch bridge. Taking 600m reinforced concrete arch bridge as the research object, based on OpenSEES software, the seismic response and seismic performance of 600m reinforced concrete arch bridge are studied in this paper. 1 the linear elastic finite element model of the bridge structure is established for the 600m reinforced concrete arch bridge. According to the material nonlinear model and the material nonlinear model considering geometric nonlinearity, the dynamic characteristics of the three models are compared and studied. On this basis, 20 natural seismic waves are selected to be applied to the structure under uniform excitation for IDA analysis, and the calculated results of typical seismic waves are selected to compare the seismic response values of the structures. The results show that material nonlinearity and geometric nonlinearity have great influence on the internal force and displacement response of 600m reinforced concrete arch bridge. Considering the material nonlinearity, the maximum bending moment of the elastic model increases by 44.1% and 84.8%, respectively, under longitudinal and transverse vertical earthquakes. After considering geometric nonlinear material nonlinearity, the maximum bending moment of material nonlinear model is increased by 32.5% and 4.4.2 respectively under longitudinal vertical and transverse vertical earthquake, considering material nonlinearity and geometric nonlinearity, respectively. The effect of reinforcement content on seismic behavior of main arch ring is studied. The internal force response value and displacement response value of the main arch ring under longitudinal and horizontal vertical ground motion are compared and analyzed. The results show that the change of longitudinal steel bar content has little effect before the main arch ring is nonlinear. When the main arch ring is nonlinear, the influence is greater. However, the change of stirrups content has a great influence on the seismic performance of the main arch ring. The peak acceleration of the nonlinear ground motion has changed greatly. (3) the continuous beam-continuous rigid frame system (scheme A) and the continuous beam-continuous rigid frame system (scheme B) with T-frame junction piers are adopted for the bridge beam. The seismic response analysis considering material nonlinearity and geometric nonlinearity in different span arrangement forms of bridge beam is studied. The peak acceleration of the bridge beam is 0. 1 g / 0. 4 g, respectively. The seismic internal force response and displacement response under 0.8 g and 1.2 g are compared and analyzed, and a more reasonable trial design scheme of scheme A and scheme B is obtained. On the basis of this, the experimental design scheme is further analyzed and compared. The optimal trial design was obtained.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55;U448.22
本文编号：2392843
[Abstract]:Earthquakes around the world have caused great loss of human life and property. Bridge as a lifeline project, once the earthquake damage, rescue and relief bring serious obstacles. Reinforced concrete arch bridge is a suitable bridge structure in mountainous area because of its beautiful appearance, strong span ability and low cost. Up to now, Wanzhou Yangtze River Bridge in Chongqing is still the longest span reinforced concrete arch bridge in the world. Europe, America, Japan, China and so on have carried on the exploratory research to the 600m-1000m class super-large span reinforced concrete arch bridge. Taking 600m reinforced concrete arch bridge as the research object, based on OpenSEES software, the seismic response and seismic performance of 600m reinforced concrete arch bridge are studied in this paper. 1 the linear elastic finite element model of the bridge structure is established for the 600m reinforced concrete arch bridge. According to the material nonlinear model and the material nonlinear model considering geometric nonlinearity, the dynamic characteristics of the three models are compared and studied. On this basis, 20 natural seismic waves are selected to be applied to the structure under uniform excitation for IDA analysis, and the calculated results of typical seismic waves are selected to compare the seismic response values of the structures. The results show that material nonlinearity and geometric nonlinearity have great influence on the internal force and displacement response of 600m reinforced concrete arch bridge. Considering the material nonlinearity, the maximum bending moment of the elastic model increases by 44.1% and 84.8%, respectively, under longitudinal and transverse vertical earthquakes. After considering geometric nonlinear material nonlinearity, the maximum bending moment of material nonlinear model is increased by 32.5% and 4.4.2 respectively under longitudinal vertical and transverse vertical earthquake, considering material nonlinearity and geometric nonlinearity, respectively. The effect of reinforcement content on seismic behavior of main arch ring is studied. The internal force response value and displacement response value of the main arch ring under longitudinal and horizontal vertical ground motion are compared and analyzed. The results show that the change of longitudinal steel bar content has little effect before the main arch ring is nonlinear. When the main arch ring is nonlinear, the influence is greater. However, the change of stirrups content has a great influence on the seismic performance of the main arch ring. The peak acceleration of the nonlinear ground motion has changed greatly. (3) the continuous beam-continuous rigid frame system (scheme A) and the continuous beam-continuous rigid frame system (scheme B) with T-frame junction piers are adopted for the bridge beam. The seismic response analysis considering material nonlinearity and geometric nonlinearity in different span arrangement forms of bridge beam is studied. The peak acceleration of the bridge beam is 0. 1 g / 0. 4 g, respectively. The seismic internal force response and displacement response under 0.8 g and 1.2 g are compared and analyzed, and a more reasonable trial design scheme of scheme A and scheme B is obtained. On the basis of this, the experimental design scheme is further analyzed and compared. The optimal trial design was obtained.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.55;U448.22
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