Test and numerical simulation of partially encased composite columns subject to axial and cyclic horizontal loads

Abstract

Partial encased composite (PEC) members with thin steel plates and three types of constructional detailing are studied. Six pieces of PEC column specimens were tested under constant vertical load and cyclic horizontal loads. A numerical FE model is established. In the model, the in-filled concrete is decomposed as transverse and longitudinal springs, considering the functions and the properties of the concrete in two directions. This model simplifies the numerical computation with high efficiency, and acquires a satisfied agreement with test results in both capacity and deformability of the PEC member. The parametrical study by the FE model is performed. By tests and numerical analysis, it is found that though local buckling of thin plate of H steel is a crucial factor, when the compressively axial load does not surpass the encased steel capacity, the PEC could behave quite well under cyclic horizontal loads. No distinguished difference in three kind details was observed, so that PEC member could be built in a simple way.

Study on Seismic Performance and Damage Analysis of Steel Plate Shear Wall with Partially Encased Composite (PEC) Columns

“…He not only revealed the failure mechanism of steel, but also put forward formulas of critical and post-buckling. PEC column, as an edge restraint member of steel plate shear wall structure, not only bears the large vertical load from the upper part of the structure, but also resists the large bending moment caused by lateral force [42][43][44]. Meanwhile, PEC columns have good fire resistance and cost savings [45,46].…”

Seismic Response Analysis and Connection Performance Evaluation of a Hybrid Coupled PEC Wall System

“…With the cracking of the concrete, the stiffness decreases rapidly, and the stiffness degradation tends to be stable at the large displacement stage. (2) e initial stiffness of model PEC-3 is 11.9% lower than that of model PEC-1, and this phenomenon is due to the smaller web sections of the weak connection models, leading to lower lateral stiffness compared with that of the strong connection models. Meanwhile, the initial stiffness of the models with transverse stiffeners is higher than that of the models without the transverse stiffeners.…”

“…It has great potential as a seismic-resistant solution if properly designed to exploit the stiffness contribution of the concrete material and the dissipative capacity of the steel components. Meanwhile, the PEC structure has excellent fire resistance and can be assembled directly in the field after processing in factories [1][2][3][4]. Currently, the behaviour of PEC columns and PEC beams has been widely studied [5][6][7][8][9][10].…”

Experimental and Numerical Study of Octagonal Composite Column Subject to Various Loading

“…Chen et al [15] conducted the series of experimental and numerical studies on PEC columns subjected to axial and cyclic horizontal loads. They concluded that interval of links effect for preventing local buckling of steel with large width-thickness ratio, and for benefiting the post-buckling capacity of steel.…”