本文關(guān)鍵詞：考慮剪切效應(yīng)的混凝土橋墩撞擊動(dòng)態(tài)力學(xué)特性研究　出處：《公路工程》2017年04期 　論文類型：期刊論文

  更多相關(guān)文章： 橋梁工程 橋墩 剪切變形 撞擊 動(dòng)力響應(yīng)

【摘要】：為研究橋墩撞擊剪切動(dòng)力響應(yīng)問題,基于Hamilton原理,將剪切變形引入碰撞體系偏微分方程中,考慮材料的動(dòng)態(tài)力學(xué)性能,通過Laplace變換和Matlab軟件求解,建立了考慮剪切效應(yīng)的鋼筋混凝土和鋼骨混凝土橋墩動(dòng)態(tài)剪力方程和動(dòng)態(tài)彎矩方程,揭示了橋墩撞擊動(dòng)力響應(yīng)受剪切效應(yīng)影響的力學(xué)特征。理論計(jì)算和試驗(yàn)結(jié)果對(duì)比表明:剪切變形對(duì)橋墩試件峰值彎矩和峰值主拉應(yīng)力的平均影響分別為8.82%和18.83%,剪切效應(yīng)對(duì)橋墩撞擊動(dòng)力響應(yīng)的影響較大,不可忽略。在橋墩抗撞強(qiáng)度設(shè)計(jì)中,不僅需要驗(yàn)算橋墩最大彎矩截面的拉應(yīng)力,還應(yīng)驗(yàn)算墩底的主拉應(yīng)力,以體現(xiàn)剪切效應(yīng)對(duì)橋墩撞擊剪切破壞的影響,保證橋墩結(jié)構(gòu)的安全。
[Abstract]:In order to study the dynamic response of pier to impact shear, based on Hamilton principle, shear deformation is introduced into the partial differential equation of impact system, and the dynamic mechanical properties of materials are considered. The dynamic shear equation and dynamic moment equation of reinforced concrete and steel reinforced concrete pier are established by Laplace transform and Matlab software. The mechanical characteristics of the impact dynamic response of piers affected by shear effect are revealed. The comparison between theoretical calculation and experimental results shows that:. The average effect of shear deformation on the peak bending moment and the peak principal tensile stress of the pier specimen is 8.82% and 18.83% respectively. The shear effect has a great influence on the impact dynamic response of the pier, which can not be ignored. In the design of the impact strength of the pier, it is necessary not only to check the tensile stress of the maximum moment section of the pier, but also to calculate the main tensile stress at the bottom of the pier. In order to reflect the effect of shear effect on the impact shear failure of pier, the safety of pier structure is ensured.
【作者單位】： 南京工業(yè)大學(xué)土木工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助(51278243)
【分類號(hào)】：U441
【正文快照】： 0前言近年來,車船撞擊橋墩的事故頻繁發(fā)生,造成了巨大的經(jīng)濟(jì)損失和社會(huì)影響,橋墩在沖擊荷載下的動(dòng)力響應(yīng)及破壞與在靜載下的行為有很大的不同,引起了許多學(xué)者的高度重視[1-3],然而,目前車船撞擊橋墩動(dòng)響應(yīng)的研究中大都僅僅考慮了彎曲變形,考慮剪切變形的較少,認(rèn)為剪切變形相對(duì)

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1 杜柏松;項(xiàng)海帆;葛耀君;朱樂東;;剪切效應(yīng)梁?jiǎn)卧獎(jiǎng)偠群唾|(zhì)量矩陣的推導(dǎo)及應(yīng)用[J];重慶交通大學(xué)學(xué)報(bào)(自然科學(xué)版);2008年04期

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