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Experimental study of a new type of high-strength monolithic square-section concrete columns with spiral stirrups

Xianchao Zheng, Liyun Fan, Zhao Jun

Archives of Civil Engineering

2023

Vol. 69, nr 4

319--337

In this paper, four full-scale concrete columns with high-strength spiral stirrups (HSSS) are constructed and tested under low-cycle repeated loading. The specimens consisted of two cast-in-place columns and two precast concrete columns encased by a partly square steel pipe and bolt bars. The structural analysis of the HSSS columns of precast concrete conducted here is novel, and past experimental data for this are not available. To assess the seismic behavior and failure mechanisms of the new connections, quasi-static tests were carried out on columns prefabricated with them and cast-in-place specimens. The responses of all columns were compared, and the results showed that the failure modes of all columns are the large eccentric damage, and the destruction of all specimens occur at the column foot. The anti-seismic property of the precast HSSS concrete columns was comparable to that of the HSSS cast-in-place columns. A comparison of such performance parameters as energy dissipation and coefficient of ductility revealed that the precast HSSS concrete columns are suitable for use in earthquake zones.

The effect of different layouts in internal and external stiffeners on the energy absorption of thin-walled structures with square sections

Nia A. A., Attar A. A.

Archives of Civil and Mechanical Engineering

2017

Vol. 17, no. 4

997--1010

This study attempted to examined the energy absorption and the mechanical behavior of thin-walled aluminum structures with square section, which are connected to the structural wall by either internal or external stiffeners and then exposed to axial quasi-static loading. The features of energy absorption examined in these structures included specific energy absorption, mean crush force, initial maximum force, deformation style and returns to crush force efficiency. The impact of stiffener layout on energy absorption was evaluated through several primary simulations through LS-DYNA for hypothetical models. Finally, a few different samples of the primary models were developed and tested experimentally. In experimental studies after annealing and determining the mechanical properties of aluminum 1100, the energy absorption properties under quasi-static pressure were found. The results of numerical and experimental studies showed good consistency. The results showed that the specific energy absorption of square thin-walled structures enhances as the number of stiffeners increases, which depends on the position of the stiffeners. The experimental tests proved that the layout of stiffeners according to the proposed model can increase specific energy absorption (SEA) by up to 65% compared to samples without stiffeners. Moreover, the crush force efficiency (CFE) during the test amounted desirably to 0.69.