本文選題：冷彎薄壁型鋼 + 方鋼管�。� 參考：《建筑結(jié)構(gòu)學報》2017年05期

【摘要】：為研究采用覆板加強的冷彎方鋼管T形節(jié)點的軸向滯回性能,對2組支管與主管的截面寬度比β分別為0.4和0.8的方鋼管直接焊接節(jié)點和采用覆板加強的方鋼管T形節(jié)點進行了軸向往復加載試驗。詳細介紹了試驗節(jié)點的設計、試驗過程及破壞形態(tài),并對節(jié)點試件的滯回曲線、骨架曲線、耗能和延性等性能進行了分析。試驗中,試驗節(jié)點經(jīng)歷了主管屈服、初始開裂、裂紋閉合、裂縫擴展、裂縫貫通五個主要階段,但各試件的開裂位置并不相同。加強覆板阻止了裂縫向主管管壁發(fā)展,有效避免了主管管壁的撕裂破壞,使開裂后支管的受壓荷載繼續(xù)上升,因而節(jié)點開裂后受拉能力較未加強節(jié)點的好。支管與主管截面寬度比越小,試件的耗能能力和延性越好。但覆板加強處理降低了試件的耗能能力,且支管與主管寬度比越小其耗能能力的降低越明顯。受拉裂縫會降低試件的延性,故軸拉循環(huán)的延性較對應的軸壓循環(huán)的差。在β=0.8時,覆板加強對試件的抗震延性有所改善,但β=0.4時加強節(jié)點試件的位移延性系數(shù)低于未加強節(jié)點。覆板加強節(jié)點在支管軸向往復荷載作用下的拉壓不均衡問題應引起重視。
[Abstract]:In order to study the axial hysteretic behavior of cold-formed square steel tube T-joints strengthened by overlay, The axial reciprocating loading tests were carried out for two groups of directly welded joints of square steel tube with cross section width ratio 尾 of 0.4 and 0.8 and T-joints strengthened by overlay respectively. The design, test process and failure mode of the test joints are introduced in detail. The hysteretic curves, skeleton curves, energy dissipation and ductility of the joints are analyzed. There are five main stages in the test, I. e., supervisor yield, initial cracking, crack closure, crack propagation and crack penetration, but the cracking positions of each specimen are different. The strengthened overlay prevents the crack from developing to the main pipe wall, effectively avoids the tear damage of the pipe wall, and makes the compressive load of the branch pipe continue to rise after cracking, so the tensile capacity of the joint after cracking is better than that of the joint without strengthening. The smaller the ratio of branch tube to top section width, the better the energy dissipation ability and ductility of the specimen. However, the energy dissipation capacity of the specimen was decreased with the strengthening treatment of the overlay, and the decrease of the energy dissipation capacity was more obvious when the ratio of the branch tube to the top width was smaller. The ductility of the specimen is decreased by tensile crack, so the ductility of axial tension cycle is worse than that of axial compression cycle. At 尾 0. 8, the seismic ductility of the strengthened specimens is improved, but the displacement ductility coefficient of the strengthened joints at 尾 0. 4 is lower than that of the unstrengthened joints. Attention should be paid to the unbalance between tension and compression of the reinforced joints under axial reciprocating loads.
【作者單位】： 中國礦業(yè)大學深部巖土力學與地下工程國家重點實驗室;江蘇建筑職業(yè)技術(shù)學院;中國礦業(yè)大學江蘇省土木工程災變與結(jié)構(gòu)可靠性重點實驗室;
【基金】：國家自然科學基金項目(51408596) 江蘇省自然科學基金項目(BK20140195) 江蘇建筑節(jié)能與建造技術(shù)協(xié)同創(chuàng)新中心開放基金項目(SJXTY1510,SJXTY1609)
【分類號】：TU392.3

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