钢箱系杆拱桥CFRP系杆受力性能试验研究  

Experimental study on the mechanical property of CFRP tie bolts at steel box tied-arch bridge

作　　者：周先雁[1] 陈强[1,2] 刘灵勇[2] 王智丰[1] 

机构地区：[1]中南林业科技大学,湖南长沙410004 [2]湖南城市学院,湖南益阳413000

出　　处：《中南林业科技大学学报》2011年第1期1-8,共8页Journal of Central South University of Forestry & Technology

基　　金：国家自然科学基金项目(50978258);国家林业局948项目(2010-4-14);湖南省自然科学基金重点项目(06JJ21001)

摘　　要：以芷江舞水大桥为原型,按照相似原理,建立了碳纤维系杆拱桥缩尺试验模型,对其受力性能进行试验研究,并采用空间有限元分析软件Midas/Civil对模型桥使用阶段各工况进行了空间模拟分析。结果表明:在相同荷载作用下,系杆拉力及拱脚位移在拱顶最大正弯矩工况最大。另外,在相同荷载作用下,偏载工况中偏载边系杆拉力及拱脚相对位移比在正载工况大。CFRP系杆拉力和拱脚水平位移的实测结果与有限元分析结果基本吻合,用有限元程序的计算分析结果指导模型桥测点选取和加载等工作是可行的,其分析结果是正确的。CFRP作为系杆其总预应力损失率的最大测量值为2.1%,预应力损失较小,其预应力值稳定。With the Wushui Bridge as the prototype,and according to analogue principle,a reduced scale test model of CFRP tied-arch bridge was established to study the mechanics behaviors.And the space simulation analysis for the model bridge in the service phases under different conditions was carried out by employing the spatial finite element analysis software Midas/Civil.Results show that： with the same loads,the tie bolts tensile force and spring relative displacement were the biggest values at maximum positive bending moment of arch crown condition.In addition,with the same loads,the tie bolts tensile force and spring relative displacement under eccentric load condition were bigger than that under normal load condition.The measurement values of CFRP tie bolts tension force and spring horizontal displacement coincided with the finite element analysis values.The findings show that it is feasible to use finite element analysis results to guide the load of modeling bridge and the selection of measuring point,and the analysis results are correct.The measured maximum value of CFRP tie bolts pre-stressing loss rate was 2.1%.Losses of pre-stress were smaller than that of the control,so the pre-stress values were stability.

关 键 词：系杆拱桥 模型实验 系杆 碳纤维 

分 类 号：U448.225[建筑科学—桥梁与隧道工程]