管幕预筑结构拱形构件受力性能研究

Study on Mechanical Properties of Arch Members of Pipe-Roof Pre-construction Structures

摘要

为探究矢跨比对地下工程中管幕预筑结构受力性能的影响,以矢跨比为参数,设计并完成了2个管幕预筑结构构件的受力试验,通过荷载-挠度曲线、钢管幕及混凝土截面的应变对比分析,探究不同矢跨比试件的破坏过程及破坏形态,分析矢跨比对构件力学性能的影响。建立数值计算模型,进一步探究矢跨比、混凝土强度、配筋率对管幕预筑结构拱形构件承载力的影响规律。结果表明:管幕预筑结构拱形构件采用固定端部约束,在对称集中荷载作用下呈现压弯破坏形态;矢跨比参数的变化对管幕预筑结构构件的承载力有较大影响,当矢跨比从0.048增加至0.102时,构件的极限承载力及刚度变大;混凝土强度、配筋率对构件的极限承载力影响较小。

Abstract

In order to explore the influence of rise-span ratio on the mechanical properties of Pipe-Roof Pre-construction (PRP) structures in underground engineering, mechanical tests on two PRP structure members were designed and completed with rise-span ratio as a parameter. Through the comparative analysis of load-deflection curves and strains of steel pipe curtain and concrete section, the failure process and failure mode of different rise-span ratio specimens were explored, and the influence of rise-span ratio on the mechanical properties of members was analyzed. A numerical calculation model was established to further explore the influence of rise-span ratio, concrete strength and reinforcement ratio on the bearing capacity of the PRP structure arch members. The results show that with fixed end constraints, the bending failure mode of the PRP structure arch members is presented under symmetrical concentrated load. The change of rise-span ratio has a great influence on the bearing capacity of the PRP structure arch members. When the rise-span ratio increases from 0.048 to 0.102, the ultimate bearing capacity and stiffness of the members become larger. The concrete strength and reinforcement ratio have little effect on the ultimate bearing capacity of the members.

关键词

管幕预筑结构 / 数值分析 / 矢跨比 / 拱形构件 / 承载力

Key words

pipe-roof pre-construction structures / numerical analysis / rise-span ratio / arch members / bearing capacity

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基金资助

国家自然科学基金青年基金资助项目(52008271)

国家级大学生创新创业训练计划项目(202410107031)