圆管带式输送机整机钢结构动力特性与抗震性能分析

Dynamic characteristics and seismic performance analysis of steel structure of pipe belt conveyor

针对圆管带式输送机线路布置复杂,普遍具有弯弧桁架,大跨度栈桥和高支腿等结构,在地震作用下存在发生结构破坏的风险;以某典型的圆管带式输送机项目为研究背景,研究整机钢结构的抗震性能。首先在3D3S中建立整机结构的有限元模型,提取满足振型参与质量要求的振型数进行模态分析,找出整机的薄弱部位,同时将模态分析的结果与ANSYS计算结果进行对比;然后基于薄弱部位布置测点,通过时程分析计算测点在地震作用下的结点位移,研究整机结构的抗震性能。结果表明:3D3S模态分析得到的自振周期与ANSYS分析的最大误差不超过20%,两者吻合效果较好;桁架与支腿连接处为整机结构薄弱部位;整机结构中的支腿和栈桥的弹塑性水平和竖向位移相对较大,抵抗了大量的地震能量;在7度地震作用下,桁架结构的最大挠跨比为1/1536,支腿的最大弹塑性层间位移角为1/156,均满足相关规范要求。研究结果表明,该圆管带式输送机整机结构具有良好的抗震性能。

In view of the complex layout of pipe belt conveyors,which generally have curved truss,long-span trestle and high outriggers,there is a risk of structural damage under the action of earthquakes.Taking a typical pipe belt conveyor project as the research background,the seismic performance of the steel structure of the whole machine is studied.At first,the finite element model of the whole machine structure is established in 3D3S.Then the number of modes that meet the quality requirements of the mode shape is extracted for modal analysis,so that the weak parts of the whole machine are found.At the same time,the modal analysis results are compared with the ANSYS calculation results.Then,the measuring points are arranged based on the weak parts.And the node displacement of the measuring points under the action of earthquake is calculated by time history analysis,so as to study the seismic performance of the whole machine structure.The results show that the maximum error between the natural vibration period obtained by 3D3S modal analysis and the ANSYS analysis is not more than 20%.The two are in good agreement.In addition,the connection part between the truss and the outrigger is the weak part of the whole structure;the elastic-plastic horizontal and vertical displacement of the trestle bridge is relatively large,which resists a large amount of seismic energy.Also,Under the 7-degree earthquake,the maximum flexural-span ratio of the truss structure is 1/1536,and the maximum elastic-plastic interlayer displacement Angle of the legs is 1/156,which meet the requirements of relevant codes.The research results show that the whole structure of the pipe belt conveyor has good seismic performance.