Effects of Multi-Directional Displacement Paths on the Cyclic Behaviour of Rectangular Hollow Steel Columns

Abstract

The unprecedented damage to steel structures during the Hyogo-ken Nanbu Earthquake not only prompted the revision of the Japanese seismic code but also emphasized the need for a comprehensive understanding of seismic response, which in reality is complex and multi-directional, as opposed to the conventionally assumed urn-directional approach. Thus, this experimental study investigated the effects of multi-directional load histories on the response of tubular columns widely used in the construction of elevated highways and building structures. Test results indicate that, in comparison with uniaxial displacement paths, multi-directional displacement patterns lead to significant degradation of stiffness, strength and ductility of tubular columns.

Displacement based seismic verification method for thin-walled circular steel columns subjected to bi-directional cyclic loading

“…Hence, Mizuno et al [21] experimentally analyzed seismic performance of steel bridge piers subjected to two-directional horizontal forces. Similarly, Watanabe et al [22] observed the behavior of steel stub columns for different bi-directional loading patterns by performing experiments, which was further extended to FE modeling [23]. Table 3 C Loading Type 2 constant in Table 3 l, m, n constants in Table 3 δ 95)CIR ultimate displacement for bi-directional circular Goto et al [24] carried out the bi-directional loading experiments on circular columns as well as FE model by implementing threesurface cyclic plasticity constitutive law for material and proposed formulas for ultimate strength and ductility.…”

“…In the previous studies, bi-directional loading patterns (bi-axial square, circular, diamond, plus type) were proposed and applied through special experimental set up on the thin-walled steel columns [7,10,22]. Among them, it is observed that particularly bi-directional circular loading pattern is most severe for circular steel columns [24]; hence, in this work the similar bi-directional loading pattern is considered such that it can be easily compared with conventional uni-directional loading pattern.…”

Finite Element Analysis of Steel Columns Subjected to Bi-directional Cyclic Loads

“…in which (1) In the second stage, three models were subjected to three types of non-linear loading patterns namely BI-CI, BI-OV, and BI-SQ, as shown in Figure 6. The analyses were carried out to examine the effects of width thickness ratio parameters and the slenderness ratio parameter on the behaviour of column.…”

“…However, a reasonable issue exists whether to incorporate the bi-axial effects in seismic designs. Several experimental studies have been so far carried out to investigate the effect of bi-directional cyclic loads on the behaviour of steel and concrete columns [1][2][3][4][5][6][7]. Nevertheless, those tests were found to be very costly and the results were Inadequate to make firm conclusions.…”

Bidirectional loading hybrid tests of square cross‐sections of steel bridge piers

“…Bidirectional quasistatic loading tests were performed by Watanabe et al [2] that employed test specimens of a relatively small 150 mm  100 mm cross-section of an electronically welded coldformed rectangular steel tube with low residual stress. Moreover, Aoki et al [3] conducted quasistatic cyclic loading tests for relatively large 450 mm  450 mm specimens with rectangular welded sections composed of stiffened steel plates.…”