Kothamuthyala, Sriharsha Reddy and S, Suriya Prakash and Thammishetti, Nikesh and Vyasarayani, Chandrika Prakash
(2018)
Optimization Based Improved Softened Membrane Model for Rectangular Reinforced Concrete Members under Combined Shear and Torsion.
Journal of Structural Engineering.
ISSN 0733-9445
Abstract
Reinforced concrete (RC) elements are often subjected to combined actions including
torsion under seismic events. Understanding the behavior of RC members under
combined actions including torsion is essential for safe design. Behavioral predictions
of RC columns under combined loading can be improved by including the bi-directional
stress effects. The objective of this work is to propose improved combined actions
softened membrane model (CA-SMM) for predicting the behavior of RC elements
under combined torsion (T) and shear loading (V). In this approach, the rectangular
cross-section is modeled as an assembly of four cracked shear panels. The applied
external loads are distributed among these four shear panels. This assumption helps in
reducing the complex stress state from combined loading to four different simple stress
states on these panels. Additional equilibrium and compatibility conditions are
imposed, and the system of non-linear equations are solved by using an optimization
technique called gradient descent method. The developed improved model (CA-SMM)
is validated with the experimental data available in the literature. After that, an
interaction between the shear and torsion is developed to understand the behavior
under various combinations of torsion and shear. A parametric study is carried out for
understanding the effect of various sectional parameters such as longitudinal
reinforcement ratio, transverse reinforcement ratio, and concrete strength. The
predictions of the improved model had a close correlation with the test results.
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