大直径塑料检查井结构力学性能分析  

ANALYSIS OF MECHANICAL PROPERTIES OF LARGE-DIAMETER PLASTIC INSPECTION SHAFT STRUCTURE

作　　者：蒋培民 吴张永[1] 杨文勇[1] 卞光明 马自刚 代龙 JIANG Pei-min;WU Zhang-yong;YANG Wen-yong;BIAN Guang-ming;MA Zi-gang;DAI Long(Faculty of Mechanical and Electrical Engineering,Kunming University of Science and Technology,650500,Kunming,China;Yunnan BaiChuan Environmental Protection Technology Co.,Ltd.,650400,Kunming,China)

机构地区：[1]昆明理工大学机电工程学院,昆明650500 [2]云南百川环保科技有限公司,昆明650400

出　　处：《建筑技术》2024年第1期116-123,共8页Architecture Technology

摘　　要：大直径塑料检查井具有壁薄容腔大、结构刚强度比传统砖砌检查井小的特点。针对此问题进行了力学分析及计算,建立有限元模型,利用ANSYS软件进行静力学仿真、结构优化和模态分析,并搭建试验平台进行最大变形量试验。结果表明:仿真验证变形量最大位于与支管连接处的两侧;应力最大位于与支管连接处的底部。通过L_(16)(4^(4))双指标综合评分正交试验优化分析,四因素对综合评分影响次序为:井体壁厚>筋距>筋宽>单侧筋厚,在最优加强筋布置方案下,井体变形率均小于2%,应力最大值均小于许用值。井体结构前6阶模态固有频率受外部结构及尺寸影响较小,与外部环境振动频率没有重叠,无共振现象发生。通过井体受力变形量试验,结果与仿真趋于一致。分析为大直径塑料检查井结构制造及施工提供了理论依据。Large-diameter plastic inspection shafts feature thinner walls,larger cavities and lower structural stiffness than conventional brick inspection shafts.In response to these problems,mechanical analysis and calculation were carried out,and a finite element model was built for static simulation,structural optimization and modal analysis with ANSYS software.In addition,the maximum deformation was tested on the built test platform.Results show that the maximum deformation in simulation verification is on both sides of the branch connection and the maximum stress is at the bottom of the branch connection.According to the comprehensive score based on two indicators L16(44)and optimization analysis of the orthogonal experiment,the order of influence of four factors on the comprehensive score is as follows:shaft wall thickness>bar spacing>bar width>unilateral bar thickness.In the optimal reinforcement layout scheme,the shaft deformation rate is less than 2%,and the maximum stress is less than the allowable value.The natural frequencies of the first 6 modes of shafts are affected little by external structures and dimensions and not overlapped with vibration frequencies in the external environment,so there is no resonance.The results of the deformation test of the stressed shaft are consistent with the simulation results.The analysis of the fabrication and construction of large-diameter plastic inspection shafts provides a theoretical basis.

关 键 词：大直径检查井 力学分析 有限元分析 结构优化 模态分析 

分 类 号：TU992[建筑科学—市政工程]