Closure to “Design Guide for Partially Restrained Composite Connections” by the ASCE Task Committee on Design Criteria for Composite Structures in Steel and Concrete

This paper presents the development of an improved detail in partially restrained beam-to-column composite connections in concrete filled square tubes and the evaluation of its structural characteristics and behaviour under monotonic and cyclic loading. Studies for the bolted seat-angle connections of existing partially restrained composite connection (PR-CC) details have been conducted mostly on shallow beam-to-column connections. In case of deep beam-to-column connections, the fabrication becomes complicated because the sizes of the seat-angles are larger than the connections, and the number of bolts and welding length are increased. This study suggests a new detail of PR-CC which can be applied to concrete-filled tubular structures incorporating the effect of composite slabs and the performance for construction work. A welded bottom beam flange connection is proposed to enhance the capacity of the bottom of the connection and to improve ductility and fabrication. In addition, a reduced beam section (RBS) is adapted for the bottom beam flange to examine its effect on ductility. A seat-angle connection with penetrating bolts is also suggested and compared with the welded bottom beam flange connection. Both monotonic and cyclic loading tests are conducted on the five full scale specimens to compare and evaluate their ductility characteristics.

Download Full-text

Stochastic Finite Element Analysis of Composite Structures with Partially Restrained Connections under Earthquake Loads

International Journal of Science and Engineering Applications ◽

10.7753/ijsea0912.1003 ◽

2020 ◽

Vol 9 (12) ◽

pp. 147-152

Author(s):

Özlem Çavdar

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Composite Structures ◽

Structural Safety ◽

Stochastic Dynamic ◽

Stochastic Finite Element ◽

Element Analysis ◽

Analysis And Design ◽

Stochastic Finite Element Analysis ◽

Partially Restrained

The stochastic analysis of composite structures with partially restrained (PR) connections under seismic loads present some interesting and challenging issues to practicing engineers. This paper proposes an efficient, robust, and accurate method for stochastic finite element analysis of concrete–steel composite structures allowing for PR connections. These are followed by suitable numerical example which indicates that employment of such a stochastic finite element analysis. The Kocaeli earthquake in 1999 is considered as a ground motion. The connections parameters and material properties are random variables. It is essential to properly consider the PR connections in the stochastic dynamic analysis and design of the steel-concrete composite structures since design forces change significantly. The assumption that the connections are rigid, which is routinely used in the application, is not proper. The effect of the variability connection stiffness on the composite structures responses is sufficiently important for consideration in structural safety.

Download Full-text