S形钢龙骨-夹芯板防护层的落石冲击缓冲性能试验研究

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (24) : 148-155.

论文

张山1，张俊发1，陶磊2，刘浩召1

作者信息 +

Tests for cushion performance of a protective layer with S-shaped steel joist and sandwich slab under rockfall impact

ZHANG Shan1，ZHNAG Jun-fa1，TAO Lei2，LIU Hao-zhao1

Author information +

文章历史 +

摘要

为了减小高山峡谷中落石对建构筑物墙体的危害，提出了S形钢与EPS泡沫夹芯板组合防护层的方案。自行设计制作了S形冷弯薄壁型钢，对采用这种防护方案的四角支承钢筋混凝土板，开展了一系列的落石冲击试验。通过对落石冲击力及钢筋混凝土板四角处的支座反力变化过程研究，得到了落石冲击力和板底支座反力随时间的变化形态，探讨了新型防护结构的缓冲性能。与无防护结构试验结果对比分析表明，新型防护结构使落石冲击钢筋混凝土板的持续时间延长了5~6倍，最大冲击力降低了一半，平均冲击力减小至1/7~1/6，板内钢筋与混凝土产生的最大应变率数量级由105s-1降至103~10-2s-1，大大降低了落石对钢筋混凝土板的冲击破坏程度，具有良好的缓冲防护性能。

Abstract

To reduce wall damages of buildings and structures in alpine canyons due to rockfall impact, a protective layer scheme with combination of S-shaped steel and EPS foam sandwich slab was proposed. S-shape cold-formed thin-walled steel was designed and self-made. The proposed protective layer scheme was used on a RC slab supported at four corners, then a series of rockfall impact tests were conducted on this RC slab. The cushioning performance of the protective layer was studied mainly through observing the variation of rockfall impact force and support reaction forces at four corners of the RC slab with time. The results were compared with those without the protective layer. It was shown that the new protective layer makes the time duration of rockfall impacting the RC slab be lengthened 5 ~ 6 times, the biggest impact force decreases 50%, the average impact force decreases from the initial value to its 1/7 ~ 1/6, the maximum strain rate in the RC slab drops from105s -1 to 103 ~ 10-2s-1, the damage level of the RC slab due to rockfall impact is greatly reduced, so the proposed protective layer has a good cushion performance.

导出引用

张山1，张俊发1，陶磊2，刘浩召1. S形钢龙骨-夹芯板防护层的落石冲击缓冲性能试验研究[J]. 振动与冲击, 2017, 36(24): 148-155

ZHANG Shan1，ZHNAG Jun-fa1，TAO Lei2，LIU Hao-zhao1. Tests for cushion performance of a protective layer with S-shaped steel joist and sandwich slab under rockfall impact[J]. Journal of Vibration and Shock, 2017, 36(24): 148-155

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