地震作用下桥梁结构多点碰撞影响参数研究  

Study on the Influence Parameters of Multi-Point Collision of Bridge Structure Under Earthquake

作　　者：肖恒 XIAO Heng(Chongqing Three Gorges University,Chongqing 404000,China)

机构地区：[1]重庆三峡学院,重庆404000

出　　处：《河南科技》2023年第4期50-54,共5页Henan Science and Technology

摘　　要：【目的】研究敏感因素对桥梁结构在地震作用下的多点碰撞响应的影响规律并探索一种新的振动台试验模型简化方法。【方法】将桥梁模型按力学关系进行简化处理,并在有限元软件中创建简化碰撞模型,采用线弹簧-阻尼(kelvin)接触单元模型,对桥梁结构在地震作用下的多点碰撞影响参数展开分析。【结果】计算结果表明,在桥梁结构多点碰撞中,碰撞间隙,碰撞单元刚度、桥墩高度等都对桥梁多点碰撞有显著影响。此外,碰撞刚度增大会使碰撞力增大,但这种趋势不是无限的;初始间隙和桥墩高度增加对碰撞力的增长没有表现出明显的规律。地震波种类不同也是影响桥梁多点碰撞的重要因素。【结论】通过简化碰撞模型来研究敏感因素对桥梁多点碰撞的影响具有可行性,简化碰撞模型的多点碰撞振动台试验也可以在后续进一步开展。[Purposes] In order to study the influence of sensitive factors on the multi-point collision response of bridge structure under earthquake and explore a new simplified method for shaking table test models.[Methods] Simplify the bridge model by mechanical relationship,and a simplified collision model is created in the finite element software.The wire spring-damping(kelvin) contact element model was used to analyze the multi-point collision parameters of the bridge structure under the action of earthquake.[Findings] The calculation results show that in the multi-point collision of bridge structures,collision clearance,collision element stiffness,pier height,etc.have a significant impact on the multi-point collision of bridges.In addition,an increase in collision stiffness increases the impact force,but this trend is not infinite;The initial clearance and the increase in pier height did not show a clear pattern in the increase of collision force.Different types of seismic waves are also important factors affecting the multi-point collision of bridges.[Conclusions] It is feasible to study the influence of sensitive factors on bridge multi-point collision by simplifying the collision model,and the multi-point collision shaker test of the simplified collision model can be further carried out in the future.

关 键 词：桥梁结构 多点碰撞 数值模拟 影响参数 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]