This thesis develops a novel modelling strategy depicted JSPM (joint-shell punching model) for simulating punching failure of reinforced concrete (RC) slabs in which nonlinear joint elements are combined with nonlinear 2-D shell elements. Punching failure of the nonlinear joint is governed by the failure criterion of the critical shear crack theory (CSCT) of Muttoni (2008). A notable feature of the JSPM is that joint punching resistance is continually updated during the analysis in terms of the slab sector rotation calculated at the previous load step. This feature enables the JSPM to accurately simulate the slab-column connection behaviour from the initial load stage, occurrence of punching (peak), followed by a transition to post-punching stage without the need of post-processing. This modelling strategy has been implemented in the nonlinear structural analysis program ADAPTIC (Izzuddin, 1991).
Throughout the thesis, the proposed JSPM has been extended to simulate various practical scenarios, including punching of: slabs supported on elongated column, slabs subjected to eccentric loading (both monotonic and reversed-cyclic), and slabs with shear reinforcement. In total, 90 internal slab-column connections from test database were simulated to verify the proposed JSPM. In addition, NLFEA based on 3-D solid elements were simulated in ATENA (Cervenka et al., 2018) to provide an objective comparison (benchmark). The JSPM is shown to produce accurate predictions of the measured slab-column connection behaviour while requiring significantly less computation time than the NLFEA with solid elements. The analysis and comparison of the numerical and test data were used to inform design procedures: including: a) shear-field method to design slabs supported on elongated column or wall; b) simplified analytical method to determined drift-induced punching for slabs subjected to reversed-cyclic loading.
***
The fib, Fédération internationale du béton, is a not-for-profit association formed by 42 national member groups and approximately 1000 corporate and individual members. The fib’s mission is to develop at an international level the study of scientific and practical matters capable of advancing the technical, economic, aesthetic and environmental performance of concrete construction.
The knowledge developed and shared by the fib (fib Bulletins, fib events, fib workshops, fib courses, etc.) is entirely the result of the volunteer work provided by the fib members.
The fib was formed in 1998 by the merger of the Euro-International Committee for Concrete (the CEB) and the International Federation for Pre-stressing (the FIP). These predecessor organizations existed independently since 1953 and 1952, respectively.
Негізгі бет Ғылым және технология fib YMG | Efficient Strategy for Modelling Punching Failure of Flat Slabs | Andri Setiawan
Пікірлер: 1