内衬混凝土对波形钢腹板刚构桥扭转和畸变性能的影响

摘要

Two comparison test models of three-span single cell box variable cross section continuous rigid frame bridge with corrugated steel webs (one with inner lining concrete and another without) were designed and constructed.Through the static load test and finite element analysis of the model,the impact of inner lining concrete on the torsion and distortion performance of continuous rigid frame bridge with corrugated steel webs was investigated.Results show that the inner lining concrete can increase the bending stiffness and torsional stiffness of box girder with corrugated steel webs as well as restrain the torsion effect and longitudinal warping effect under eccentric load.The deflection,eccentric load coefficient,longitudinal stress and longitudinal warping stress of continuous rigid frame bridge with corrugated steel webs all decrease with the increase of the length and thickness of inner lining concrete.Under the same volume of concrete,the effect of increasing the length of inner lining concrete on improving the torsion and distortion of continuous rigid frame bridge with corrugated steel webs is more obvious than that of increasing the thickness.%设计制作了2座3跨单箱单室变截面波形钢腹板连续刚构桥模型(有和无内衬混凝土条件下各1座),通过模型的静载试验和有限元分析,研究内衬混凝土对波形钢腹板连续刚构桥扭转和畸变性能的影响.结果表明:内衬混凝土能够提高波形钢腹板箱梁的抗弯刚度和抗扭刚度,并且抑制偏心荷载作用下的扭转效应以及纵向翘曲效应;波形钢腹板刚构桥的挠度、偏载系数、纵向应力及纵向翘曲应力均随内衬混凝土长度、厚度的增加而减小;相同混凝土体积条件下,增加内衬混凝土的长度比增加厚度对波形钢腹板刚构桥扭转和畸变的改善效果更为明显.