A unified approach to evaluate axial force-moment interaction curves of concrete encased steel composite columns

AbstractThis paper proposes a methodology for obtaining the interaction curve for composite steel-concrete sections subject to combined compression and bending based on the deformation domains of reinforced concrete structures defined by ABNT NBR 6118 [1]. For this, were developed expressions for the axial force, the moment and the strains of concrete, longitudinal reinforcement and the elements comprising the metal profile in each deformation domain.Based on these expressions a computer program called MDCOMP (2014) was created. In this study the same limit values of longitudinal reinforcement strain defined by ABNT NBR 6118 [1] were used for the steel profile strains. To verify the numerical implementations performed, the interaction curves and the plastic resistance of the section obtained by MDCOMP program were compared with those determined from the recommendations of Eurocode 4 [2], of ABNT NBR 8800 [3] or literature responses.

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Predicting the behaviour of HSS double chord trusses—a comparison with test results

Canadian Journal of Civil Engineering ◽

10.1139/l83-042 ◽

1983 ◽

Vol 10 (2) ◽

pp. 261-270 ◽

Cited By ~ 6

Author(s):

Robert M. Korol ◽

Farooque A. Mirza ◽

Ernie T.-C. Chiu

Keyword(s):

Analytical Model ◽

Axial Force ◽

Axial Load ◽

Reasonable Agreement ◽

Test Results ◽

Force Interaction ◽

Moment Interaction ◽

Interaction Curves ◽

Spring Mechanism ◽

Shear Spring

Predictions from a previously developed analytical model that takes into account plastic hinging action and includes the effects of axial load and moment interaction are compared with the results of tests on double chord RHS trusses. The model incorporates a shear spring mechanism that is applicable to gap joints of HSS trusses. Load–displacement curves generated by the program are in reasonable agreement with the majority of truss tests. However, calculated moment – axial force interaction curves tend more to predict trends of behaviour rather than to be quantitatively accurate.

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Axial-moment interaction of high strength concrete encased steel composite columns: Experimental investigation

Journal of Constructional Steel Research ◽

10.1016/j.jcsr.2020.106370 ◽

2020 ◽

Vol 175 ◽

pp. 106370

Author(s):

Binglin Lai ◽

J.Y. Richard Liew

Keyword(s):

Experimental Investigation ◽

High Strength Concrete ◽

High Strength ◽

Composite Columns ◽

Strength Concrete ◽

Moment Interaction ◽

Axial Moment ◽

Steel Composite

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Experimental and Analytical Study on Creep Characteristics of Box Section Bamboo-Steel Composite Columns under Long-Term Loading

Materials ◽

10.3390/ma14040983 ◽

2021 ◽

Vol 14 (4) ◽

pp. 983

Author(s):

Shixu Wu ◽

Keting Tong ◽

Jianmin Wang ◽

Yushun Li

Keyword(s):

Load Level ◽

Experimental Results ◽

Creep Model ◽

Composite Column ◽

Composite Columns ◽

Creep Coefficient ◽

Creep Characteristics ◽

Section Size ◽

Steel Composite

To expand the application of bamboo as a building material, a new type of box section composite column that combined bamboo and steel was considered in this paper. The creep characteristics of eight bamboo-steel composite columns with different parameters were tested to evaluate the effects of load level, section size and interface type under long-term loading. Then, the deformation development of the composite column under long-term loading was observed and analyzed. In addition, the creep-time relationship curve and the creep coefficient were created. Furthermore, the creep model of the composite column was proposed based on the relationship between the creep of the composite column and the creep of bamboo, and the calculated value of creep was compared with the experimental value. The experimental results showed that the creep development of the composite column was fast at first, and then became stable after about 90 days. The creep characteristics were mainly affected by long-term load level and section size. The creep coefficient was between 0.160 and 0.190. Moreover, the creep model proposed in this paper was applicable to predict the creep development of bamboo-steel composite columns. The calculation results were in good agreement with the experimental results.

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