防灾减灾工程学报2023，Vol.43Issue(6)：1304-1312,9.DOI:10.13409/j.cnki.jdpme.20220303001
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
Comparative Analysis on Dynamic Response of Prestressed and Non-prestressed Reinforced Concrete Beams Based on Transient Method
郑文华 1宫剑飞 2刘明保2
作者信息
- 1. 中国建筑科学研究院有限公司地基基础研究所,北京 100013||住房和城乡建设部防灾研究中心,北京 100013
- 2. 住房和城乡建设部防灾研究中心,北京 100013||中国建筑科学研究院有限公司建筑机械化研究分院,北京 100007
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摘要
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 un-der 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 marked-ly enhances the beam's stress state,promoting uniform load distribution.Under the blast load,the pre-stress bar absorbs most stress,reducing the load on non-prestressed bars,thereby highlighting the cru-cial 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 ex-plosion,which is significantly different from the non-prestressed reinforced concrete beam.These in-sights offer valuable guidance for the application of prestressed reinforced concrete structures in the field of blast loading resistance.关键词
瞬态动力分析/冲击荷载/预应力/混凝土/爆炸Key words
transient dynamic analysis/impact load/prestress/concrete/blast分类
建筑与水利引用本文复制引用
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):1304-1312,9.
