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The purpose of this paper is to examine and explain the complex interrelationships which influence the performance of politically connected firms to create value for their providers of finance and other stakeholders. In doing so, it examines the interrelationships between efficiency and delivering on corporate performance of a firm with political ties.

The authors gathered the literature from the Scopus website. They reviewed the literature of 58 manuscripts about the efficiency and performance of politically connected firms.

The research finds that the better quality of efficiency of politically connected firms is positively related to the corporate performance of politically connected firms. The authors’ theoretical findings corroborate the political theory, agency theory, stakeholder theory, resource dependency theory and stewardship theory. These theories prove that political connections have an impact on firm performance as a politician reinforces the efficacy. To better understand the effect of political connections on solid performance due to efficiency, this study classifies various efficiencies and links them with political ties.

Several avenues of research are suggested to examine further the interrelationships identified.

The authors’ conceptual findings are valuable for institutional investors, policymakers and stakeholders. To sum up, all theoretical shreds of evidence prove that politically connected firms can enhance performance via efficiency.

The paper conceptualizes the efficiency and performance interrelationships of politically connected firms. The extant literature comparison allows an assessment of the extent to which different efficiency contexts lead to differences in performance.

This study aims to investigate the effects of using circular spirals as the longitudinal reinforcing bars on the performance of the concrete beams subjected to four-point bending load.

The effects of using circular spirals as the longitudinal reinforcing bars on the performance of the concrete beams subjected to four-point bending load are investigated in this study. Employing circular spirals as the main longitudinal reinforcement is a novel idea presented in this paper. In this regard, a finite element model of the beam with spiral longitudinal reinforcement was developed. After model verification, several configurations of concrete beams reinforced by longitudinal spirals were simulated under the four-point loading condition.

Obtained results showed that using the longitudinal spirals in place of the conventional longitudinal reinforcing bars can improve the bearing capacity of the concrete beam, but at the same time, increases its ductility unacceptably. In other words, the spirals reduce the initial stiffness of the beam significantly. To solve the problem, the authors decided to use the longitudinal spirals as the auxiliary bars added to the main conventional longitudinal bars in the beams. New gained results were satisfactory. By adding the longitudinal spirals to the conventional bars, not only the bearing capacity of the beam increases between 24% and 63%, but also the initial stiffness and ductility of the beam raises between 11%–29% and 3%–57%, respectively, in comparison to the corresponding beam reinforced with conventional longitudinal bars.

Employing circular spirals as the main longitudinal reinforcement is a novel idea presented in this paper.