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Unified compressive strength model for axially loaded circular composite short columns
Abstract Composite columns are widely used in modern structures owing primarily to their excellent structural performance, but they usually have very different ultimate axial compressive strength prediction models, which may lead to confusion for researchers and engineering designers. In addition, given the similarity of their mechanical mechanisms, there may be a generic prediction model for these columns. Hence, the authors aim to provide a simple and effective unified ultimate compression prediction model for axially loaded circular composite short columns. A rich experimental database is firstly established. Then the force analysis of a typical concrete-filled double-skin steel tubes (CFDST) column is illustrated, and it can be easily extended to other types of composite columns. Based on the above force analysis, the stress state of each component of the column can be determined via different sections and loading concepts. Contributions of the inner steel tube to the load-bearing capacity are further clarified, and the passively confined compressive strength of the concrete core is also investigated on the basis of the proposed equivalent confining stress. Subsequently, the calculation flow of the ultimate compression strength is briefly demonstrated. Finally, the ultimate compression prediction model is evaluated by the established test database, and good consistency can be observed for circular composite short columns with a widely varied parameter.
Highlights Concept of equivalent confining stress in circular composite columns is proposed. An equivalent confining stress-based unified strength prediction model is established. Contributions of the inner and outer tubes to composite columns are fully clarified. This unified model has very good accuracy by validation with 410 test results.
Unified compressive strength model for axially loaded circular composite short columns
Abstract Composite columns are widely used in modern structures owing primarily to their excellent structural performance, but they usually have very different ultimate axial compressive strength prediction models, which may lead to confusion for researchers and engineering designers. In addition, given the similarity of their mechanical mechanisms, there may be a generic prediction model for these columns. Hence, the authors aim to provide a simple and effective unified ultimate compression prediction model for axially loaded circular composite short columns. A rich experimental database is firstly established. Then the force analysis of a typical concrete-filled double-skin steel tubes (CFDST) column is illustrated, and it can be easily extended to other types of composite columns. Based on the above force analysis, the stress state of each component of the column can be determined via different sections and loading concepts. Contributions of the inner steel tube to the load-bearing capacity are further clarified, and the passively confined compressive strength of the concrete core is also investigated on the basis of the proposed equivalent confining stress. Subsequently, the calculation flow of the ultimate compression strength is briefly demonstrated. Finally, the ultimate compression prediction model is evaluated by the established test database, and good consistency can be observed for circular composite short columns with a widely varied parameter.
Highlights Concept of equivalent confining stress in circular composite columns is proposed. An equivalent confining stress-based unified strength prediction model is established. Contributions of the inner and outer tubes to composite columns are fully clarified. This unified model has very good accuracy by validation with 410 test results.
Unified compressive strength model for axially loaded circular composite short columns
Lin, Chenghuan (author) / Zhou, Jikai (author)
2023-01-30
Article (Journal)
Electronic Resource
English
Compressive Strength of Axially Loaded Composite Cylinders
| British Library Online Contents | 1993
Ultimate strength of short axially loaded columns
| Engineering Index Backfile | 1954