NSTS管幕结构横向连接方法试验研究
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摘要
提出一种基于钢管连接的NSTS(new steel tube slab)管幕结构,在纵向大钢管之间横向布置连接小钢管,浇筑混凝土后形成纵横向复合钢管混凝土整体结构,以解决现有管幕结构施工难度大、横向刚度及承载力低等缺点.通过试验研究不同钢管连接方式对NSTS构件受力性能的影响.结果表明,采用螺栓+T型钢板连接及采用螺栓连接的试件与仅采用T型钢板连接的试件相比,承载力分别提高58. 4%,51. 2%,刚度分别提高123. 3%,97. 5%,螺栓+T型钢板的连接方法对NSTS构件的受力性能最为有利;混凝土强度等级对试件的刚度和变形影响较大,对承载力影响不明显.
A new steel tube slab( NSTS) structure using small-sized steel tubes as transverse connections was presented in order to ease the construction difficulty and enhance the transverse stiffness and the bearing capacity of the NSTS. Small-sized steel tubes were arranged between the longitudinal steel tubes in transverse direction,forming a composite structure of concrete-filled steel tube after concreting the longitudinal and transverse steel tubes. The connection methods between the transverse tube and the longitudinal tube were studied by analyzing the mechanical behavior of NSTS members. The results indicate that the bearing capacity of the specimen connected by bolts + T-shaped steel plate,and only by bolts is increased by 58. 4% and 51. 2%respectively,compared with that connected only by T-shaped steel plate,and the stiffness is increased by 123. 3% and 97. 5%,respectively. The connection method of bolts + T-shaped steel plate is most favorable to the mechanical behavior of the NSTS members. The concrete strength affects the stiffness and deflection of the specimen,but has little impact on the bearing capacity.
A new steel tube slab( NSTS) structure using small-sized steel tubes as transverse connections was presented in order to ease the construction difficulty and enhance the transverse stiffness and the bearing capacity of the NSTS. Small-sized steel tubes were arranged between the longitudinal steel tubes in transverse direction,forming a composite structure of concrete-filled steel tube after concreting the longitudinal and transverse steel tubes. The connection methods between the transverse tube and the longitudinal tube were studied by analyzing the mechanical behavior of NSTS members. The results indicate that the bearing capacity of the specimen connected by bolts + T-shaped steel plate,and only by bolts is increased by 58. 4% and 51. 2%respectively,compared with that connected only by T-shaped steel plate,and the stiffness is increased by 123. 3% and 97. 5%,respectively. The connection method of bolts + T-shaped steel plate is most favorable to the mechanical behavior of the NSTS members. The concrete strength affects the stiffness and deflection of the specimen,but has little impact on the bearing capacity.
引文
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[12] Lee J H,Lee Y J. Analysis of ground behavior for model tunnel excavation w ith pipe roof reinforcement using close range photogrammetric technique[J]. Journal of Korean Tunnelling&Underground Space Association,2014,16(4):387-402.
[13] Sim Y,Jin K N. Experimental analysis for the effect of integrated pipe-roof in trenchless method[J]. Journal of Korean Tunnelling&Underground Space Association,2016,18(5):377-387.
[14]阎石,王世哲,金春福,等.新管幕构件横向锚固力学特性试验[J].沈阳建筑大学学报(自然科学版),2016(5):778-787.(Yan Shi,Wang Shi-zhe,Jin Chun-fu,et al. Experimental study on mechanical characteristics of horizontal anchor in new tubular roof method[J]. Journal of Shenyang Construction University(Natural Science),2016(5):778-787.)
[15]贾鹏蛟,赵文,郝云超,等.不同结构参数下STS管幕构件力学性能的数值分析[J].东北大学学报(自然科学版),2016,37(8):1177-1181.(Jia Peng-jiao,Zhao Wen,Hao Yun-chao,et al. Numerical analysis of the mechanical properties of steel tube slab component under different structural parameters[J]. Journal of Northeastern University(Natural Science),2016,37(8):1177-1181.)
[16] Zhao W,Jia P,Yu H,et al. Study on the effect of combining steel tube slab(STS)w ith PBA method for a large span subw ay underground station in Shenyang[C]//The 4th ISRM Young Scholars Symposium on Rock M echanics. Jeju City,2017:10-13.
[2] Hemerijckx E. Tubular thrust jacking for underground roof construction on the Antw erp metro[J]. Tunnels and Tunneling,1985(5):13-15.
[3] Darling P. Jacking under Singapore's busiest street[J].Tunnels&Tunnelling International,1993,10(5):19-23.
[4] Jeon H T,Kim Y H,Kim S K. The construction of Lot 923subw ay station using the trenchless TRCM(tubular roof construction method)[J]. Harmony of Nature and Civilization(Korean),2007,55(5):39-47.
[5] Kang Y,Liu Q,Cheng Y,et al. Combined freeze-sealing and new tubular roof construction methods for seaside urban tunnel in soft ground[J]. Tunnelling and Underground Space Technology,2016,58:1-10.
[6]关永平,赵文,王连广,等. STS管幕结构抗弯性能试验研究及参数优化[J].工程力学,2017,34(9):83-91.(Guan Yong-ping,Zhao Wen,Wang Lian-guang,et al. Study on parameter optimization and the flexural behavior of steel tube slab structures[J]. Engineering Mechanics,2017,34(9):83-91.)
[7] Zhang P,Ma B,Zeng C,et al. Key techniques for the largest curved pipe jacking roof to date:a case study of gongbei tunnel[J]. Tunnelling and Underground Space Technology,2016,59:134-145.
[8] Yen J,Shou K. Numerical simulation for the estimation the jacking force of pipe jacking[J]. Tunnelling and Underground Space Technology,2015,49:218-229.
[9] Shi P,Liu W,Pan J,et al. Experimental and analytical study of jacking load during microtunneling Gongbei tunnel pipe roof[J]. Journal of G eotechnical and G eoenvironmental Engineering,2017,144(1):05017006.
[10]黎永索,张可能,黄常波,等.管幕预筑隧道地表沉降分析[J].岩土力学,2011,32(12):3701-3707.(Li Yong-suo,Zhang Ke-neng,Huang Chang-bo,et al.Analysis of surface subsidence of tunnel built by pipe-roof pre-construction method[J]. Rock and Soil Mechanics,2011,32(12):3701-3707.)
[11]李慎刚,韩健勇,石建军,等. STS新管幕工法钢管顶进现场试验[J].东北大学学报(自然科学版),2016,37(10):1469-1473.(Li Shen-gang,Han Jian-yong,Shi Jian-jun,et al. Field test on steel pipe jacking by STS method[J]. Journal of Northeastern University(Natural Science),2016,37(10):1469-1473.)
[12] Lee J H,Lee Y J. Analysis of ground behavior for model tunnel excavation w ith pipe roof reinforcement using close range photogrammetric technique[J]. Journal of Korean Tunnelling&Underground Space Association,2014,16(4):387-402.
[13] Sim Y,Jin K N. Experimental analysis for the effect of integrated pipe-roof in trenchless method[J]. Journal of Korean Tunnelling&Underground Space Association,2016,18(5):377-387.
[14]阎石,王世哲,金春福,等.新管幕构件横向锚固力学特性试验[J].沈阳建筑大学学报(自然科学版),2016(5):778-787.(Yan Shi,Wang Shi-zhe,Jin Chun-fu,et al. Experimental study on mechanical characteristics of horizontal anchor in new tubular roof method[J]. Journal of Shenyang Construction University(Natural Science),2016(5):778-787.)
[15]贾鹏蛟,赵文,郝云超,等.不同结构参数下STS管幕构件力学性能的数值分析[J].东北大学学报(自然科学版),2016,37(8):1177-1181.(Jia Peng-jiao,Zhao Wen,Hao Yun-chao,et al. Numerical analysis of the mechanical properties of steel tube slab component under different structural parameters[J]. Journal of Northeastern University(Natural Science),2016,37(8):1177-1181.)
[16] Zhao W,Jia P,Yu H,et al. Study on the effect of combining steel tube slab(STS)w ith PBA method for a large span subw ay underground station in Shenyang[C]//The 4th ISRM Young Scholars Symposium on Rock M echanics. Jeju City,2017:10-13.
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