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本文通过对四根用低炭冷拔钢筋作曲线形配筋的预应力混凝土连续梁的静荷载试验,观察研究了梁在各受荷阶段的实际工作情况和内力重分布的现象,并着重对该类梁在弹塑性阶段的内力重分布的规律性、重分布程度、破坏特征、极限荷载等问题作了分析探讨。由试验结果与理论计算比较证明:在低含钢率及合理调幅范围的条件下,配置低炭冷拔钢筋的预应力混凝土连续梁,虽无明显的塑性阶段,仍能达到充分的内力重分布状态;其承载能力可较按强性理论计算值提高24%左右。
In this paper, through the static load test of four prestressed concrete continuous beams with low-carbon cold-drawn steel bars as reinforcing bars for curved reinforcement, the actual working conditions and redistribution of internal forces of the beams at various loading stages were observed and focused on. The regularity, redistribution, damage characteristics, ultimate load, etc. of the redistribution of internal forces in the elasto-plastic stage were analyzed and discussed. The comparison between the experimental results and the theoretical calculations proves that under the condition of low steel content and reasonable range of amplitude modulation, the prestressed concrete continuous beam with low carbon cold drawn steel bars can achieve sufficient internal force redistribution even though there is no obvious plastic stage. State; its carrying capacity can be increased by about 24% compared with the calculated value of strong theory.