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钢管混凝土圆弧拱的抗弯力学性能实验研究与工程应用
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摘要
本文以深井巷道支护为研究背景,以钢管混凝土为研究对象,通过实验测试数值模拟与理论计算,全面地分析论证了钢管混凝土短柱和圆弧拱力学性能进行了钢管混凝土短柱轴压实验和混凝土短柱常规三轴实验,比较了不同壁厚钢管混凝土短柱承载性能差别,分析了壁厚对短柱承载力塑性变形特性和破坏形态的影响,得出了短柱壁厚效应进行抗弯强化型钢管混凝土直梁抗弯性能实验圆弧拱承载性能实验,研究了不同抗弯强化条件下直梁和圆弧拱的抗弯性能与中性层偏移规律;实测了直梁弯曲变形时的平截面假设成立条件;分析了荷载形式与矢跨比对圆弧拱承载性能的影响,推导了中性层偏移和承载力相关计算公式进行了千米深井钢管混凝土支架支护工程应用,实测了支护荷载,取得了优良的支护成果
Based on the deep roadway supporting problem, and with concrete filled steel tube as theresearch object, through three methods such as experimental test, numerical simulation andtheoretical calculation analysis, the comprehensive analysis of concrete filled steel tube shortcolumn and circular arch mechanics performance is done in this paper. By concrete filled steeltube short column axial compression experiment and concrete short columns conventionaltriaxial test, it is contrasted that the bearing capacity of concrete filled steel tubular short columnunder different wall thickness, it is analyzed that the wall thickness effect on bearing capacity ofshort columns, influence of plastic deformation characteristics and failure pattern, the wallthickness effect is concluded. By the bending performance test of flexural strengthening concretefilled steel tube straight beam and the load-bearing performance experiment of flexuralstrengthening concrete filled steel tube arch, it is researched that bearing capacity and the neutrallayer migration rule of straight beam and arch under the different flexural strengthening. The flatsection assumption establishment condition of straight beam bending deformation is verified. Itis analyzed that the effect of load form and rise-span ratio on arch bearing performance, theneutral layer of offset and bending bearing capacity calculation formula were deduced.Engineering application of concrete filled steel tube support is done in the km deep well, thesupporting load is measured, and good support results is achieved.
引文
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