带加强圈的多跨钢波纹板拱涵施工力学行为试验研究

Construction Mechanical Behavior Test of Multi⁃span Steel Corrugated Plate with Reinforcing Ring Arch Culvert

以4孔跨度9m钢波纹板拱涵为背景开展现场试验研究,针对拱背浇筑泡沫混凝土和拱顶回填土体施工过程,分析不同拱跨、有无加强圈断面关键位置的受力和变形特征。主要结论为:不同拱跨与有无加强圈对拱涵位移影响较小,且拱涵变形总体较小,最大约为4mm,应力满足设计标准,但拱脚截面应进行重点监控;不对称回填和不同回填材料造成边中跨、边跨两侧应力存在差异,在拱顶回填中,边跨钢波纹板、钢筋和加强圈内混凝土的应力均比中跨对应位置要大,最大差值分别为31.06,27.29,1.93MPa;加强圈仅在拱顶回填时充分参与受力,能显著减小拱脚波峰位置钢波纹板应力,减小量约为其设计强度的10%。

Field test research is carried out against the background of four-span corrugated steel plate arch culvert with each span of 9m.The force and deformation characteristics of different arch spans and key positions of section with or without reinforcing rings are mainly discussed,in the light of the construction process of foam concrete for arch back filling and soil for arch crown backfilling.The main conclusions are as follows:Different arch spans with or without reinforcing ring have little influence on the displacement of the arch culvert,and the deformation of the arch culvert is relatively small as a whole,the maximum is about 4mm.Stress meets design criteria,but arch foot section should be monitored with emphasis.Stresses at middle span and side span are different due to asymmetric backfilling and different backfilling materials.In arch crown backfilling,the stress of steel corrugated steel plate at side span,steel bar and concrete in reinforcing ring are larger than that of middle span,with the maximum difference of 3106MPa,2729MPa and 193MPa,respectively.The reinforcing ring takes full part in the stress only when the arch crown is backfilled,which can significantly reduce the stress of steel corrugated plate at the arch foot crest position by about 10%of its design.