王锦燕,岳幸超
王锦燕,岳幸超.不同轴压比火后框架节点加固抗震性能数值分析[J].混凝土与水泥制品,2019(10):74-76.
WANG J Y,YUE X C.Numerical Analysis on the Seismic Performance of Reinforced Post-fire Steel Concrete Frame Joints under Different Axial Compression Ratio[J].China Concrete and Cement Products,2019(10):74-76.
不同轴压比火后框架节点加固抗震性能数值分析
王锦燕,岳幸超
王锦燕,岳幸超.不同轴压比火后框架节点加固抗震性能数值分析[J].混凝土与水泥制品,2019(10):74-76.
WANG J Y,YUE X C.Numerical Analysis on the Seismic Performance of Reinforced Post-fire Steel Concrete Frame Joints under Different Axial Compression Ratio[J].China Concrete and Cement Products,2019(10):74-76.
摘 要:数值模拟了钢板加固火后混凝土框架节点的抗震性能,分析了轴压比对加固节点包括滞回曲线、承载能力、耗能、应力分布的影响。结果表明:相比于火后未加固节点,钢板加固后的节点在不同轴压比下弹性阶段承载力几乎不变,但极限承载力、耗能能力、延性均有不同程度的变化;当轴压比为0.5时,极限承载力、耗能能力相比未加固分别提高了8.2%、3.2%,表现出理想的抗震效果;随着轴压比的增大,节点应力分布从低轴压比下的梁端处的高应力区转变为高轴压比下的柱子的高应力分布,结构的破坏形式发生改变。
Abstract: The seismic behavior of concrete frame joint strengthened by steel plates after fire was simulated numerically. Hysteretic curve, bearing capacity, energy dissipation and stress distribution were analyzed under different axial compression ratio. The results show that the bearing capacity in elastic phase almost unchanged at different axial compression ratios, but ultimate bearing capacity, energy dissipation capacity and ductility of the strengthened joints change differently. The ultimate bearing capacity and energy dissipation capacity of strengthened concrete frame joint are increased by 8.2% and 3.2% respectively when the axial compression ratio is 0.5, showing an ideal seismic effect. With the increase of axial compression ratio, the stress distribution of the strengthened joints changes from the high stress region at the end of beam under low axial compression ratio to the high stress distribution of column under high axial compression ratio. The failure mode of structure is changed.
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