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沈阳地铁某车站采用STS(Steel Tube Slab)管幕结构作为初期支护,在施工阶段需承受上覆土压力和路面荷载,其横向承载力对整个工程的安全尤为重要。该文基于6榀STS管幕简支梁的对称集中荷载抗弯试验,研究了STS管幕构件的破坏过程、裂缝开展模式及破坏机理,并对比分析了混凝土强度、钢管间距以及管间横向连接方式对承载力的影响规律。基于ABAQUS建立数值计算模型,进一步研究了钢管壁厚、翼缘板厚度等参数对STS管幕构件承载力的影响规律,并根据计算结果提供了翼缘板厚度与钢管壁厚之比的合理取值范围。研究成果将为STS管幕构件的设计提供参考依据。
A station of Shenyang Metro adopts the STS (Steel Tube Slab) pipe curtain structure as initial support. During construction, it is required to bear overburden pressure and road load. The lateral bearing capacity is particularly important for the safety of the whole project. Based on the symmetric concentrated beam bending test of 6 榀 STS pipe-curtain simply supported beams, the failure process, crack initiation mode and failure mechanism of STS pipe curtain members were studied. The concrete strength, pipe spacing and transverse connection The influence of mode on bearing capacity. Based on the ABAQUS numerical model, the influence of parameters such as the thickness of steel pipe and the thickness of flange plate on the bearing capacity of STS pipe curtain is further studied. According to the calculation results, the reasonable ratio of flange plate thickness to pipe wall thickness is obtained Value range. The research results will provide a reference for the design of STS pipe curtain components.