关键词: 管幕预筑结构, 连接件, 对拉钢筋, 偏压构件, 数值模拟, 承载力

Abstract: Three pipe roof-prefabricated structural members with varying configurations of transverse reinforcement bars are designed to conduct laboratory loading tests under three levels of eccentricity. The investigation focuses on the failure modes, load-deflection relationships, and ultimate bearing capacities of these members. Subsequently, finite element models that replicate the tests are developed to validate the reliability of these models by comparing the computational results with the experimental outcomes. This comparison elucidates the influence of the diameter and placement of the transverse reinforcement on the ultimate bearing capacity. The findings reveal: (1) Transverse reinforcement connectors, when arranged in eccentric compression members of pipe roof prefabricated structures, significantly enhance the stress distribution within the steel pipe curtain and improve the integration of steel plates with concrete, thereby augmenting both the load-bearing and deformation capacities of the members. (2) The ultimate bearing capacity of the structure escalates with an increase in the diameter of the transverse reinforcement. (3) Although the placement of the transverse reinforcement has a minimal impact on the strength and stiffness of the structure, the optimal bearing capacity is achieved when the reinforcement is positioned at the largest span of the variable section under conditions of minor eccentric compression and at the junction between the variable and flat sections under conditions of significant eccentric compression.

Key words: pipe roof prefabricated structure, connector, transverse reinforcement, eccentric compression members; numerical simulation, bearing capacity