Experimental Study on Flexural Behavior of Steel Tubular-concrete CompositePile Considering Influence of Mud and Radius-thickness Ratio

DAI Guoliang, FENG Shengming, NIU Jiawei, GONG Weiming

Abstract

In order to study the influence of residual mud during construction process and steel pipe with different radius-thickness ratio on the flexural behavior of concrete filled steel tube, six steel tubular composite pile specimens were prepared by simulating underwater pouring of concrete for bending experiment and cross-section measurement. Through the test, M-um，M-Φ curves，flexural resistance and stiffness of these specimens were obtained. The test results show that the existence of mud weakens the stiffness and flexural resistance of concrete-filled steel tube by approximately 5%~25% and 5%~10%, respectively. The smaller the radius-thickness ratio is, the more obvious the influence of mud is. The steel tube and concrete no longer meet the section assumption under the influence of the mud. The flexural capacity calculated by the unified theory agrees well with the test value, but with the increase of mud thickness, it gradually becomes larger than the test values, which leads to the reduction of the reserve for safety in design. The coefficient of the stiffness formula is about 0.1~0.4.

 

Keywords: concrete filled steel tube, steel tubular composite pile,  mud, radius-thickness ratio,  bending properties, bending bearing capacity


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References


HAN L H. Concrete-filled steel tube structures-Theory and prac tice [ M] . 3rd. Beijing: Science Press, 2016: 23—24. (In Chinese)

XU Y J, ZHONG D M. Exploration on construction technology of concrete-filled steel tube [J] . Shanxi Architecture, 2010, 36 (31): 116—118. (In Chinese)

CHEN B C, WEI J G, ZHOU J, et al. Application of concrete-filled steel tube arch bridges in China: current status and prospects [J]. China Civil Engineering Journal, 2017, 50 (6): 50—61.(In Chinese)

YU Z W, DING F X, CAI C S. Experimental behavior of circular concrete-filled steel tube stub columns [J]. Journal of Construc tional Steel Research, 2007, 63 (2): 165—174.

LIU J, DING F X, GONG Y Z, et al. Mechanical behavior of concrete-filled steel tubes stub columns with circular section under local compression [J] . Journal of Hunan University (Natural Sciences), 2015, 42 (11): 33—40.(In Chinese)

XU P F, ZHANG G, LI X L, et al. Experiment study of axial compression performance of concrete filled steel tube short column with different wall thickness [J]. Journal of Beijing University of Technology, 2017, 43 (10): 1514—1520.(In Chinese)

KE X J,CHEN Z P, YING W D, et al. Experimental study on the axial compression performance of high -strength concrete filled steel tube columns [J]. Building Structure,2014,44 (16):46—49.(In Chinese)

WAN C Y, ZHA X X. Nonlinear analysis and design of concrete-filled dual steel tubular columns under axial loading [J].Steel and Composite Structures,2016, 20 ( 3): 571—597

WANG Z B , ZHANG W A, CHI S Y,et al. Flexural behavior ofcomposite concretefilled square thin -walled steel tubular specimens [J]. Journal of Building Structures,2017,38 (7): 78—84.(In Chinese)

CHEN Q J, LI Z, MENG H B,et al. Behavior of steel -jacketretrofitted column with recycled aggregate concrete under eccentric loading [J]. Journal of Hunan University ( Natural Sciences), 2018,45 (3): 29—38.(In Chinese)

WANG Z B , WEI F B, CHI S Y, et al. Study on behaviour of composite concrete -filled square thin -walled steel tubular columns under eccentrical compression [J]. Journal of Hunan University (Natural Sciences),2018, 45 (9):20—29.(In Chinese)

ZHANG Y C, CAO B Z. Critical limit of diameter to thickness ratio for axially loaded concrete filled thin -walled circular steel tubes [J]. Engineering Mechanics, 2005, 22 (1): 170—174. (In Chinese)


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