本文關(guān)鍵詞：鋼腹桿-勁性骨架混凝土弦桿組合拱節(jié)點受力性能試驗　出處：《中國公路學(xué)報》2017年02期 　論文類型：期刊論文

  更多相關(guān)文章： 橋梁工程 鋼腹桿 試驗研究 勁性骨架混凝土弦桿 混凝土外包系數(shù) 極限承載力

【摘要】：為進(jìn)一步增大拱橋的跨越能力,結(jié)合勁性骨架鋼筋混凝土拱橋的結(jié)構(gòu)和施工特點,提出鋼腹桿-勁性骨架混凝土(SRC)弦桿組合桁式拱圈結(jié)構(gòu),利用鋼腹桿替代混凝土腹板,省去混凝土腹板的澆筑工作,并減輕拱圈自重以達(dá)到增大拱橋跨徑的目的。為了解這種組合拱連接節(jié)點的受力特點,在鋼腹桿-SRC弦桿組合拱橋試設(shè)計研究基礎(chǔ)上,以弦桿外包混凝土厚度為主要參數(shù),進(jìn)行了3個組合拱節(jié)點及1個對比鋼管混凝土節(jié)點的試驗研究,并探討了節(jié)點的失效機(jī)理。結(jié)果表明:組合拱節(jié)點首先發(fā)生弦桿外包混凝土開裂,最終發(fā)生鋼管混凝土節(jié)點破壞;外包混凝土對受拉和受壓腹桿的受力影響很小;相比鋼管混凝土節(jié)點而言,組合拱節(jié)點受拉腹桿的接頭剛度較大;弦桿外包混凝土的厚度只影響外包混凝土的開裂荷載,外包混凝土越厚,開裂荷載越大,但不影響組合拱節(jié)點的極限承載力;結(jié)合鋼管混凝土勁性骨架混凝土柱的研究成果,建議組合拱節(jié)點的混凝土外包系數(shù)取0.50左右,其承載力可按照受拉節(jié)點發(fā)生沖剪失效模式和受壓節(jié)點發(fā)生有效寬度失效模式進(jìn)行計算,但其計算結(jié)果偏于安全。研究成果可為鋼腹桿-SRC弦桿組合拱橋的設(shè)計提供依據(jù),也可為類似連接節(jié)點的設(shè)計提供參考。
[Abstract]:In order to further increase the span capacity of arch bridge, combined with the structure and construction characteristics of reinforced concrete arch bridge with stiffened skeleton, the steel web and stiffened frame concrete reinforced concrete composite truss arch ring structure is proposed. The steel web bar is used to replace the concrete web to save the pouring work of the concrete web and to reduce the weight of the arch ring so as to increase the span of the arch bridge. Based on the experimental design of steel web SRC chord composite arch bridge, three composite arch joints and one Concrete-filled steel tubular joint were tested and studied with the chord concrete thickness as the main parameter. The failure mechanism of the joints is also discussed. The results show that the composite arch joints are first cracked by the chord and finally destroyed by the concrete-filled steel tube (CFST) joints. The external concrete has little effect on the tension and compression of web rod. Compared with the concrete-filled steel tubular joints, the joint stiffness of the tension webs of the composite arch joints is larger. The thickness of the chord concrete only affects the cracking load of the concrete. The thicker the concrete, the greater the cracking load, but not the ultimate bearing capacity of the composite arch joints. Combined with the research results of concrete-filled steel tubular reinforced concrete columns, it is suggested that the enclosing coefficient of composite arch joints should be about 0.50. The bearing capacity can be calculated according to the failure mode of the tensile joint and the effective width failure mode. The results of the study can be used as a reference for the design of steel web SRC chord composite arch bridge as well as for the design of similar joints.
【作者單位】： 福州大學(xué)土木工程學(xué)院;青島路橋建設(shè)集團(tuán)有限公司;
【基金】：國家自然科學(xué)基金項目(51178119)
【分類號】：U446.1
【正文快照】： 0引言如何增大拱橋的跨越能力是橋梁工程的一個重要研究方向,拱結(jié)構(gòu)以受壓為主,從材料方面考慮,混凝土拱橋向超大跨徑方向發(fā)展是最值得研究的方向。目前,超大跨徑混凝土拱橋主要采用勁性骨架法施工,拱圈為勁性骨架混凝土結(jié)構(gòu),勁性骨架一般為鋼管混凝土,施工過程為先架設(shè)、合龍

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