Achievements are presented for truss models of RC structures
developed in previous years: 1. Two constitutive models, biaxial and triaxial,
are based on regular trusses, with bars obeying nonlinear uniaxial σ-ε laws of
material under simulation; both models have been compared with test results and
show a dependence of Poisson ratio on curvature of σ-ε law. 2. A truss finite
element has been used in the nonlinear static and dynamic analysis of plane RC
frames; it has been compared with test results and describes, in a simple way,
the formation of plastic hinges. 3. Thanks to the very simple geometry of a
truss, the equilibrium equations can be easily written and the stiffness matrix
can be easily updated, both with respect to the deformed truss, within each
step of a static incremental loading or within each time step of a dynamic
analysis, so that to take into account geometric nonlinearities. So the
confinement of a RC column is interpreted as a structural stability effect of
concrete. And a significant role of the transverse reinforcement is revealed,
that of preventing, by its close spacing and sufficient amount, the buckling of
inner longitudinal concrete struts, which would lead to a global instability of
the RC column. 4. The proposed truss model is statically indeterminate, so it
exhibits some features, which are not met by the “strut-and-tie” model.
Author(s) Details
P. G. Papadopoulos Author(s) Details
Department of Civil Engineering, Aristotle University of Thessaloniki, Greece.
View Book :- http://bp.bookpi.org/index.php/bpi/catalog/book/201
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