Improving Total Moment Concept Equations for RC Coupled Shear Walls by Considering Coupling Beams Axial Load

Document Type : Original Article


1 Department of Civil Engineering, School of Engineering, Yasouj University, Yasouj, Iran

2 M. Sc. Structural Enginering, Department of Civil Engineering, School of Engineering, Yasouj University, Yasouj, Iran


Shear walls are widely used in steel and reinforced concrete buildings and have great importance among structural parts in medium and tall buildings as lateral loads are endured by shear walls. Coupled shear walls are being widely used in recent decades due to architectural and structural necessities. Most studies performed in this area, are addressing load transfer mechanisms, equilibrium equations of wall parts, fracture mechanisms, behavior of coupling beams and also system behavior against cyclic loads. However, effect of axial load in coupling beams has been neglected in these researches. Although many researchers considered this parameter as a negligible term in their works, a simple fact that if there is no axial load in coupling beams, there is no shear loads in the walls, proves inaccuracy of this assumption. The aim of this research is to use equilibrium equations and load transfer mechanisms for rearranging Total Moment Concept (TMC) equations and investigating coupled shear walls response against lateral loads. After improving TMC equations, a set of 3D finite element models are built to verify the results of this equations and compare the new equations to the original TMC equations. Afterwards, the required parameters for calculating TMC and Improved Total Moment Concept (ITMC) are extracted from these 3D models. It is shown that the improved equations are representing coupled shear walls behavior with more accuracy compared to the previous TMC equations. Finally, after comparing these two sets of results, some suggestions are given to improve the design process of coupled shear walls.


[1]-Dazio, A., Beyar, K., Bachmann, H., 2009, Quasi-Static Cyclic Tests and Plastic Hinge Analysis of RC Structural Walls, Engineering Structures, 31, 1556-1571,
[2]- Aghayari, R., Tahamouli, M., Ashrafi, M., 2012, Base Shear and Fundamental Period of RC Coupling Beam Structures, International Conference on Transport, Environment and Civil Engineering (ICTECE 2012) Kualalampour, 25-26.
[3]-Dario Artizabal-Ochoa, J., 1987, Seismic Behavior of Slender Coupled Shear Wall Systems, Journal of Structural Engineering, 113(10), 2221-2234,
[4]-Subedi, N. K., 1991, RC Coupled Shear Wall Systems. II: Ultimate Strength Calculations, Journal of Structural Engineering, 117(3), 681-698,
[5]- Zhang, Z-Y, Ding, R., Fan, J. S.,Tao, M. X., Nie, X., 2021, Numerical study of reinforced concrete coupled shear walls based on a two-dimensional finite element model, Journal of Engineering Structures, 224, Article 112792,
[6]-Talledo, D.A., Tesser, L., 2021, Nonlinear cyclic behavior of 2D complex RC structures by a plastic-damage concrete model with smeared reinforcement approach, Journal of Mechanics of Advanced Materials and Structures,
[7]-Liu, Y., Chen, H., Guo, Z. X., Hu, H. S., 2020, Seismic performance of subassemblies with composite wall and replaceable steel coupling beam, Journal of Asian Architecture and Building Engineering,
[8]-Salameh, M., Shayanfar, M., Barkhordari, M. A., 2021, Seismic displacements and behaviour factors assessment of an innovative steel and concrete hybrid coupled shear wall system, Journal of Structures, 34, 20-41, 
[9]-Wang, F., Shi, Q. X., Wang, P., 2021, Research on the Physical Inter-story Drift Ratio and the Damage Evaluation of RC Shear Wall Structures, KSCE Journal of Civil Engineering, 25, 2121–2133,
[10]-Hoenderkamp, J. C. D., 2012, Degree of coupling in high-rise mixed shear walls structures, Indian Academy of Sciences, Sadhana, 37(4), 481-492,
[11]-Subedi, N. K., Marsono, A. K., Aguda, G., 1999, Analysis of Reinforced Concrete Coupled Shear Wall Structures, The Structural Design of Tall Buildings, 8, 117-143,;2-7
[12]-El-Tawil, S., Kuenzli, C. M., Hassan, M., 2002, Pushover Analysis of Hybrid Coupled Walls. I: Design and Modeling, Journal of Structural Engineering, 128(10), 1272-1281,
[13]-El-Tawil, S., Harries, K., 2007, Recommendation for Seismic Design of Hybrid Coupled Walls, Conference of Structural Engineering Research Frontiers, 1-10. 10.1061/40944(249)56,
[14]-Bren͂a, S. F., Ihtiyar, O., 2011, Performance of Conventionally Reinforced Coupling Beam Subjected to Cyclic loading, Journal of Structural Engineering, 137(6), 665-676,
[15]-Xiaodong, J. b., Cheng, X., Xu, M., 2018, Coupled axial tension-shear behavior of reinforced concrete walls, Journal of Engineering Structures, 167, 132-142,
[16]-Kmiecik, P., Kaminski, M., 2011, Modeling of Reinforced Concrete Structures and Composite Structures with Concrete Strength Degradation Taken into Consideration, Archives of Civil and Mechanics Engineering, 11(3), 624-636,
[17]-Lubliner, J., Oliver, J., Oller, S., Onate, E., 1989, A Plastic-Damage Model for Concrete, International Journal of Solids and Structures, 25, 299-329,