摘要
针对青海省西宁市兴建轨道交通工程中混凝土结构的关键技术,研究了静载及疲劳下T形梁的破坏形态、疲劳寿命及变形特征。通过分析高性能钢筋混凝土T形梁的破坏形态,对比不同水胶比的钢筋混凝土T形梁的受力性能,得出不同配合比下钢筋混凝土T形梁疲劳荷载循环下的抗弯承载力、跨中挠度、截面应变、钢筋应变、裂缝宽度的影响规律,并验证了静载和疲劳下的平截面假定,以期对钢筋混凝土T形梁在电机车运行状况下的疲劳性能进行探讨,研究结果为青海地区轨道交通高性能混凝土结构的耐久性和安全性问题提供理论依据。
In this paper, the key technology of concrete structure in the construction of rail transit project in Xining of Qinghai province is discussed. The failure modes, fatigue life and deformation characteristics of T-beam under static loading and fatigue are studied. By analyzing the failure mode of high performance reinforced concrete T-beam, the mechanical properties of reinforced concrete T-beam with different water binder ratio are compared. It reached that the influence law of different combined ratio of reinforced concrete T-beam＇ s fatigue load under cyclic bending bearing capacity, deflection and strain, steel strain, crack width, and verify the plane section assumption under static load and fatigue. It is expected that the fatigue performance of reinforced concrete T-beam under the condition of electric locomotive operation is discussed. The research results will provide a theoretical basis for the structure of high performance concrete rail traffic safety and durability problems of Qinghai area.
出处
《施工技术》
CAS
北大核心
2017年第22期42-46,共5页
Construction Technology
基金
青海省科学技术厅:西宁轨道交通工程混凝土结构关键技术研究及示范(2013-G-Q06A)
关键词
轨道交通
高性能钢筋混凝土
T形梁
静载
疲劳
挠度
裂缝宽度
rail traffic
high performance reinforced concrete
T-beam
static load
fatigue
deflection
crack width
