静力模型优化分析简支T梁桥横向分布系数与刚度  

Static Model Optimization Analysis of Transverse Distribution Coefficient and Stiffness of Simply Supported T-beam Bridge

作　　者：董春彦 陈顺超 彭文柏 江强[3,4] 郑维龙 阳青成 DONG Chun-yan;CHEN Shun-chao;PENG Wen-bai;JIANG Qiang;ZHENG Wei-long;YANG Qing-cheng(School of Civil Engineering,Southwest Forestry University,Kunming 650224,China;Yunnan Provincial Key Laboratory of Building Structure and New Materials,Kunming 650223,China;Kunming Key Laboratory of Structural Safety and New Technology for Construction Engineering,Kunming 650223,China;Yunnan Institute of Building Research Co.,Ltd.,Kunming 650223,China;Yunnan Chengshun Highway Engineering Technology Co.,Ltd.,Kunming 650233,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南林业大学土木工程学院,昆明650224 [2]云南省建筑结构与新材料企业重点实验室,昆明650223 [3]云南省建筑科学研究院有限公司,昆明650223 [4]昆明市建筑工程结构安全和新技术重点实验室,昆明650223 [5]云南诚顺公路工程技术有限公司,昆明650233 [6]西南交通大学土木工程学院,成都610031

出　　处：《科学技术与工程》2024年第28期12350-12356,共7页Science Technology and Engineering

基　　金：云南省交通运输厅科技创新及示范项目(云交科教便[2020]91号);云南省建筑科学研究院有限公司科研项目(2023JKY008)。

摘　　要：鉴于桥梁荷载试验成本高且对试验人员专业性要求较高,为了能为桥梁监测提供更为贴合实况的理论数据,提出一种基于结构静力学试验测试结果修正理论参数的方法。该方法能考虑T梁间的剪切变形,比铰接T梁法更贴合梁间实际联系状况,提高了分析精度,降低了对试验人员专业性要求,并将该方法应用于有机玻璃铰接T梁桥模型的横向分布系数与刚度分析。结果表明:不考虑梁间剪力影响,在简化分析模型分析计算下,荷载横向分布影响线的计算结果与铰接T梁法一致,确保了所提简化模型与分析结果的准确性;该方法得到的荷载横向分布系数与实况契合度优于铰接T梁法,更能准确反映桥梁实际刚度;以有机玻璃模型静力实测响应值为基准,识别简化分析模型的关键控制参数,基于实测数据、修正后的理论模型及采用软件提取值计算得到的横向分布系数差异性较小,从而证实该方法能更好地反应桥梁实际刚度,为桥梁监测提供更为贴合实况的理论数据。可见静力模型优化分析简支T梁桥,在最不利荷载作用下的梁体下挠量优化率达27.71%,在3种工况下,下挠量最大梁体影响线数值优化率分别达到34.82%、13.07%和5.46%。In view of the high cost of bridge load test and the high professional requirements for test personnel,in order to provide more realistic theoretical data for bridge monitoring,a method of correcting theoretical parameters based on structural static test results was proposed.This method can consider the shear deformation between T-beams,and is more suitable for the actual connection between beams than the hinged T-beam method,which greatly improves the analysis accuracy and reduces the professional requirements for the test personnel.The proposed method was applied to the transverse distribution coefficient and stiffness analysis of plexiglass hinged T-beam bridge model.The results show that without considering the influence of shear force between beams,the calculation results of the influence line of load transverse distribution are consistent with those of the hinged T-beam method under the analysis and calculation of the simplified analysis model,which ensures the accuracy of the simplified model and analysis results.The load transverse distribution coefficient obtained by the proposed method is better than that of the hinged T-beam method,and it can more accurately reflect the actual stiffness of the bridge.Based on the static measured response value of the plexiglass model,the key control parameters of the simplified analysis model are identified.Based on the measured data,the modified theoretical model and the lateral distribution coefficient calculated by the software extraction value,the difference is small.It is proved that the method can better reflect the actual stiffness of the bridge and provide more realistic theoretical data for monitoring.It can be seen that the static model optimization analysis of the simply supported T-beam bridge,the optimization rate of the deflection of the beam under the most unfavorable load is 27.71%.Under the three working conditions,the numerical optimization rate of the influence line of the beam with the largest deflection is 34.82%,13.07%and 5.46%,respectively.

关 键 词：静力学试验 模型修正 简化分析模型 横向分布系数 刚度 有机玻璃 简支T梁桥 

分 类 号：U448[建筑科学—桥梁与隧道工程]