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利用有限元软件ABAQUS,对时变约束混凝土梁的升降温全过程内力变化进行了探讨.首先考察了梁端轴向和转动约束刚度的变化趋势;然后对单调升温以及先升温后降温情况下,时变约束混凝土梁的轴力和梁端弯矩变化过程进行了计算分析,并与定常约束混凝土梁的相应结果进行了对比.结果表明:高温下时变轴向约束梁的最大轴力比小于定常轴向约束梁,轴向约束刚度比初值越小二者相差越大;高温下时变轴向约束梁的最大梁端弯矩与定常轴向约束梁几乎相同;时变转动约束下梁的轴力比和梁端弯矩随升降温时间的变化曲线都与定常转动约束下的相应曲线一致.
The finite element software ABAQUS is used to study the internal force variation of the whole process of the time-varying confined concrete beam during the whole process of rising and falling temperature.Firstly, the changing trend of the restraining rigidity of the beam end and the rotation is investigated. The time-varying and constrained concrete beams’ axial force and bending moment change are calculated and compared with the corresponding results of the conventional confined concrete beams. The results show that the maximum axial force ratio of the axially-restraining beam with time- The constant axial restraint beam, the axial restraint stiffness smaller than the initial value of the larger the difference between the two; under high temperature axial restraint beam time-varying maximum beam end bending moment and the constant axial restraint beam is almost the same; time- The axial force ratio and the bending moment of the beam with rising and falling time are consistent with the corresponding curves under the constraint of constant rotation.