【摘要】：通過在棚洞支座處設(shè)置金屬耗能器代替?zhèn)鹘y(tǒng)砂石墊層,吸收滾石沖擊能量,可最大程度減小滾石沖擊力。常用的金屬耗能器存在初始屈服荷載遠(yuǎn)高于平均壓垮荷載的缺陷。為此,提出一種新型帶初始損傷的金屬耗能器,通過降低其初始屈服荷載,達到優(yōu)化棚洞工程的目的。基于LS-DYNA研究軸向沖擊荷載下不同初始損傷模式金屬耗能器的動力響應(yīng),比較了其破壞模式、沖擊力-位移關(guān)系與耗能效果。結(jié)果表明:合理的初始損傷設(shè)置可有效降低金屬耗能器初始屈服荷載達40%;而平均壓垮荷載、吸收的總能量基本保持不變,研究成果可為金屬耗能器在棚洞工程中的應(yīng)用提供依據(jù)。
[Abstract]:In order to absorb the impact energy of rolling stone, the impact force of rolling stone can be minimized by setting metal energy dissipation device to replace the traditional sand and stone cushion at the support of shed hole. The commonly used metal dampers have the defect that the initial yield load is much higher than the average collapse load. For this reason, a new type of metal energy dissipation device with initial damage is proposed. By reducing its initial yield load, the purpose of optimizing the greenhouse tunnel project is achieved. Based on LS-DYNA, the dynamic response of metal dampers with different initial damage modes under axial impact load is studied, and the failure mode, the relationship between impact force and displacement and the energy dissipation effect are compared. The results show that the reasonable initial damage setting can effectively reduce the initial yield load of the metal dampers up to 40, while the average collapsing load and the total energy absorbed remain basically unchanged. The research results can provide the basis for the application of metal energy dissipation device in greenhouse tunnel engineering.
【作者單位】： 中國科學(xué)院水利部山地災(zāi)害與地表過程重點實驗室;中國科學(xué)院水利部山地災(zāi)害與環(huán)境研究所;中國科學(xué)院大學(xué);中國科學(xué)院青藏高原地球科學(xué)卓越創(chuàng)新中心;成都理工大學(xué)地質(zhì)災(zāi)害與地質(zhì)環(huán)境保護國家重點實驗室;
【基金】：國家自然科學(xué)基金項目(41272346,41502297)資助
【分類號】：O347.5

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