基于瞬态分析法的预应力与非预应力钢筋混凝土梁动力响应对比分析*
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郑文华(1986—),女,硕士,副研究员。主要从事地下结构性能研究。E-mail:wenhuacabr@163.com

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TU443

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Comparative Analysis on Dynamic Response of Prestressed and Non-prestressed Reinforced Concrete Beams Based on Transient Method
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    摘要:

    提出了基于瞬态动力分析完全法的预应力钢筋混凝土梁爆炸冲击模拟方法,并采用已有试验结果验证了方法的合理性,进一步对比探讨了非预应力钢筋混凝土梁与预应力钢筋混凝土梁的动力响应差别和响应机制。研究结果表明:爆炸荷载作用下,钢筋混凝土梁的跨中底部位置最先发生塑性变形,混凝土容易受拉开裂,且爆炸荷载越大开裂越严重;由于预应力筋的存在,预应力钢筋混凝土梁跨中挠度显著减小,预应力钢筋混凝土梁开裂范围大幅减小,裂缝深度也显著降低,但是浅层裂缝的横向分布范围稍有增加;预应力改善了梁的受力状态,使得梁所受荷载均布转移,在爆炸冲击荷载作用下,大部分应力都由预应力筋来承担,非预应力钢筋的应力较小,预应力筋是提高结构抗爆性能的关键点;当脉冲荷载卸载至零后,梁跨中的挠度均能恢复至自重状态下的变形量,说明预应力钢筋混凝土梁在爆炸冲击荷载作用下,仍处于弹性工作状态,这与非预应力钢筋混凝土梁显著不同。模拟研究结果对预应力钢筋混凝土结构抵抗爆炸荷载领域的应用有一定的参考意义。

    Abstract:

    Based on the complete method of transient dynamic analysis, the simulation method of the prestressed reinforced concrete beam explosion impact is presented. The validation of this method is supported by empirical test results. In addition, the dynamic response difference and the response mechanism of the non-prestressed reinforced concrete beams and prestressed reinforced concrete beams are discussed. The results show that the plastic deformation primarily occurs at the bottom of the middle span of the reinforced concrete beam under blast load, and the concrete is easy to crack under tensile load, and the crack is more serious with the increase of blast load. Notably, prestressed beams exhibit significantly reduced mid-span deflection, decreased crack range and depth, albeit with a slight increase in the shallow crack's transverse distribution. This indicates that prestressing markedly enhances the beam's stress state, promoting uniform load distribution. Under the blast load, the prestress bar absorbs most stress, reducing the load on non-prestressed bars, thereby highlighting the crucial role of prestressed tendons in bolstering anti-explosion performance..When the impulse load drops to zero, the beam's mid-span deflection returns to its original state under self-weight. It shows that the prestressed reinforced concrete beam maintains the elastic working state under the impact load of explosion, which is significantly different from the non-prestressed reinforced concrete beam. These insights offer valuable guidance for the application of prestressed reinforced concrete structures in the field of blast loading resistance.

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郑文华,宫剑飞,刘明保.基于瞬态分析法的预应力与非预应力钢筋混凝土梁动力响应对比分析*[J].防灾减灾工程学报,2023,43(6):1304-1312

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  • 收稿日期:2022-03-03
  • 最后修改日期:2022-03-28
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  • 在线发布日期:2024-01-11
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