884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

   李天華¹，  趙均海¹，  魏雪英¹，  董曉明²，  孔  巍³
   （1 長(zhǎng)安大學(xué)建筑工程學(xué)院，西安 710061；2 長(zhǎng)安大學(xué)公路學(xué)院，西安 710064；3 中國(guó)建筑股份有限公司，北京 100037）

[摘要] 在爆炸荷載下鋼筋混凝土板的破壞可能引起人身安全甚至導(dǎo)致結(jié)構(gòu)框架的連續(xù)倒塌。利用顯式動(dòng)力分析程序ANSYS/LS-DYNA( 13.0版本)建立鋼筋混凝土單向板1/4數(shù)值模型，模擬其在爆炸荷載下的動(dòng)力響應(yīng)和破壞形態(tài)?；炷敛捎么嘈該p傷模型，鋼筋采用彈塑性模型，考慮了應(yīng)變率效應(yīng)和材料的失效。進(jìn)行了不同折合距離下爆炸破壞模式分析以及結(jié)構(gòu)動(dòng)力響應(yīng)參數(shù)分析，包括爆炸荷載強(qiáng)度、材料的強(qiáng)度、板的厚度、跨高比以及邊界條件等對(duì)其爆炸荷載下?lián)隙鹊挠绊憽?shù)值模擬的結(jié)果表明：在近距離小折合距離爆炸下，構(gòu)件發(fā)生剪切破壞，遠(yuǎn)距離大折合距離爆炸下，構(gòu)件發(fā)生彎曲破壞?；炷恋膹?qiáng)度、板的厚度、跨高比、板邊的約束情況均能明顯影響板的動(dòng)力響應(yīng)和抗爆能力，鋼筋強(qiáng)度影響甚小。
[關(guān)鍵詞] 鋼筋混凝土板；爆炸荷載；數(shù)值模擬；應(yīng)變率效應(yīng)
中圖分類號(hào)：TU375.2    文獻(xiàn)標(biāo)識(shí)碼：A  文章編號(hào)：1002-848X( 2012) Sl-0786-05

Dynamic response and parametric analysis on reinforced concrete slabs under blast loadings
Li Tianhua¹,  Zhao Junhai¹,  Wei Xueying¹,  Dong Xiaoming²,  Kong Wei³
(1 School of Civil Engineering,  Chang' an University,  Xi' an 710061,  China; 2 Highway School,  Chang' an University,  Xi' an 710064,  China; 3 China State Construction Eng.  Corp.  Ltd., Beijing 100037, China)

Abstract: The failure of reinforced concrete( RC) slabs under blast loadings may present a significant safety hazard to building occupants and even cause progressive collapse in frame structures in some cases. The numerical simulation of a 1/4 symmetry slab model using the finite element explicit code ANSYS/LS-DYNA version 13.0 was used to estimate the dynamic response and failure mode of RC one-way plates. Concrete was modeled using a brittle damage material model, and the reinforcement was modeled using a Von-Mises elasto-plastic material type with kinematic hardening.The erosion and the strain rate effects were included in the numerical model. A parametric investigation was conducted, including the effects of magnitude of the blast, material strength, thickness of slabs, span-depth ratio and boundary conditions on maximum deflections of RC slabs. The numerical simulation results showed that concrete strength, slab thickness, span-depth ratio and boundary conditions all have a sigruficant effect on deflection of RC slabs and their performance under blast loadings. The strength of steels has little effect on deflection of RC slabs and their performance under blast loadings.
Keywords: reinforced concrete (RC) slabs; blast loading; numerical simulation, strain rate effect