本文關(guān)鍵詞：爆炸沖擊荷載作用下框架結(jié)構(gòu)抗倒塌性能研究　出處：《福州大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 框架結(jié)構(gòu) 連續(xù)性倒塌 爆炸沖擊荷載 數(shù)值模擬 顯式非線性動(dòng)力分析 設(shè)計(jì)建議

【摘要】：當(dāng)前由于燃?xì)庑孤�、易燃易爆品堆置不�?dāng)?shù)仍蛩鸬谋〞r(shí)有發(fā)生,使得建筑結(jié)構(gòu)受到爆炸沖擊荷載而發(fā)生倒塌的可能性增大。框架結(jié)構(gòu)作為我國民用建筑中應(yīng)用最為廣泛的結(jié)構(gòu)形式,若其主要受力構(gòu)件的梁、柱等在爆炸沖擊荷載作用下發(fā)生了破壞,將導(dǎo)致結(jié)構(gòu)局部區(qū)域失去承載能力,進(jìn)而引發(fā)整體的連續(xù)性倒塌,可能造成嚴(yán)重的人員傷亡和社會(huì)影響。因此,對RC框架結(jié)構(gòu)在爆炸沖擊荷載作用下的抗倒塌性能進(jìn)行研究,有著重要的理論意義和工程應(yīng)用價(jià)值。但目前為止,結(jié)構(gòu)抗連續(xù)性倒塌研究主要還是集中在靜力分析方法上,與爆炸荷載相關(guān)的研究成果還非常少。有鑒于此,本文以一榀RC框架試驗(yàn)?zāi)Ｐ妥鳛檠芯繉ο?基于數(shù)值模擬分析對爆炸沖擊荷載作用下該結(jié)構(gòu)的抗倒塌性能進(jìn)行了較深入的研究。論文的主要研究成果包括以下幾個(gè)方面：(1)首先從靜力分析角度出發(fā),對現(xiàn)有的構(gòu)件重要性系數(shù)方法進(jìn)行改進(jìn),以此分析框架結(jié)構(gòu)各構(gòu)件在特定荷載作用下的倒塌順序。同時(shí),基于ANSYS/LS-DYNA程序數(shù)值模擬了框架的倒塌過程,并與試驗(yàn)實(shí)測位移進(jìn)行了對比。此外,也將理論分析的倒塌順序和數(shù)值模擬結(jié)果進(jìn)行了對比。通過相互比較,驗(yàn)證了模型的正確性。(2)其次,對爆炸沖擊荷載的相關(guān)基本理論進(jìn)行了歸納總結(jié)。研究了爆炸荷載分類、基本參數(shù)、壓力時(shí)程曲線衰減關(guān)系、爆炸沖擊波的基本概念和爆炸沖擊荷載計(jì)算方法等內(nèi)容,并由此確定了本文所采用的爆炸荷載加載方法。同時(shí)對數(shù)值模擬過程所需的材料本構(gòu)模型、邊界條件和構(gòu)件連接條件、空氣與炸藥單元網(wǎng)格尺寸等方面進(jìn)行了分析。(3)再次,基于ANSYS/LS-DYNA程序研究了爆炸沖擊荷載作用下RC框架的動(dòng)力響應(yīng)及倒塌過程。重點(diǎn)研究了爆炸沖擊波與框架結(jié)構(gòu)的相互作用、框架結(jié)構(gòu)構(gòu)件的動(dòng)力響應(yīng)、框架結(jié)構(gòu)在局部關(guān)鍵構(gòu)件失效后的連續(xù)倒塌過程等三個(gè)方面。(4)最后,采用關(guān)鍵構(gòu)件法與拉結(jié)強(qiáng)度法對框架結(jié)構(gòu)進(jìn)行加強(qiáng),以防止結(jié)構(gòu)發(fā)生倒塌并提出相關(guān)設(shè)計(jì)建議。研究結(jié)果表明：加密柱子箍筋、增大梁的縱筋配筋率以及在梁上設(shè)置外部拉結(jié)鋼筋均能有效提高框架的抗倒塌能力。而單純增加柱子的縱筋配筋率沒有明顯的效果。總體來說,本文通過漸進(jìn)式的分析過程,首先從靜力方面驗(yàn)證了框架模型的正確性,再以此作為爆炸沖擊下動(dòng)力分析的基準(zhǔn)模型,最后結(jié)合動(dòng)力分析結(jié)果提出了相關(guān)加強(qiáng)結(jié)構(gòu)抗倒塌性能的設(shè)計(jì)建議,因此實(shí)現(xiàn)了完整的爆炸沖擊荷載下框架結(jié)構(gòu)的倒塌性能分析流程。
[Abstract]:The current due to gas leak, flammable and explosive goods stacking improperly caused when the explosion occurred, the building structure subjected to blast loading and collapse. The possibility of increasing the frame structure as China's civil widely used, if the main stress components of beam column happened damage under explosion loading, will cause the local structure lose the bearing capacity, and thus lead to progressive collapse of the whole, may cause casualties and serious social impact. Therefore, research on anti collapse performance of RC frame structure in the explosion load hit down, has important theoretical significance and engineering application value. But so far, the research of progressive collapse resistance is mainly concentrated on the static analysis method, there is very little research achievements related to explosive load. In view of this, this paper In a RC test framework model as the research object, numerical simulation analysis on anti collapse performance of the structure under blast loading is studied. Based on the research results of this paper are as follows: (1) firstly from the perspective of static, the importance coefficients of components existing methods are improved. In order to analyze the collapse sequence of each member of a frame structure in a particular load. At the same time, the ANSYS/LS-DYNA program numerical simulation of collapse process based on the framework, and compared with the measured displacement. In addition, the order will also collapse the results of theoretical analysis and numerical simulation were compared. Through comparison, verify the correctness of the model. (2). Secondly, summarizes the basic theory of explosion shock loading. The explosion load classification, basic parameters, pressure time curves of attenuation relationship Department of basic concepts and contents of explosion shock wave blast load calculation method, and thus determine the explosive loading method used in this paper. At the same time, the constitutive model of the numerical simulation process of required materials, boundary conditions and component connection conditions were analyzed with single air explosive element mesh size and so on. (3) again, based on the ANSYS/LS-DYNA program to study the dynamic response and collapse process of RC frame under blast loading. Focus on the interaction of shock wave and frame structure, dynamic response of frame structure, frame structure in three aspects of local key components after the failure of the progressive collapse process (4) finally. The key component, and Rachel strength method of frame structure strengthened to prevent structural collapse and put forward relevant suggestions of design. The results show that: the encryption column stirrup,. The beam longitudinal reinforcement ratio and is arranged outside the beam Rachel reinforced frame can effectively improve the anti collapse capacity. And simply increasing the column longitudinal reinforcement ratio has no obvious effect. In general, the asymptotic analysis process, first the correctness of model validation framework from static aspect. As the benchmark model analysis under explosive impact force, finally combined with the results of dynamic analysis and design suggestions are put forward to strengthen the relevant structural anti collapse performance, thus realizing the collapse performance of the frame structure under blast loading complete process of analysis.

【學(xué)位授予單位】：福州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TU375.4

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 劉進(jìn)紅;;框架結(jié)構(gòu)中的建筑與建筑中的框架結(jié)構(gòu)[J];山西建筑;2008年16期

2 李國強(qiáng);框架結(jié)構(gòu)P-△效應(yīng)的簡捷計(jì)算[J];工業(yè)建筑;1991年03期

3 趙玉星,孟曙光,賈甲,張波;設(shè)置附加剪彎桿的大跨度框架結(jié)構(gòu)[J];山東建筑工程學(xué)院學(xué)報(bào);2000年03期

4 萬瑞明 ,范平;非地震區(qū)底框架結(jié)構(gòu)耐火穩(wěn)定性分析[J];甘肅消防;2000年02期

5 黃志強(qiáng),黃志斌;跨變框架結(jié)構(gòu)的設(shè)計(jì)[J];浙江建筑;2001年S1期

6 王滋軍,劉偉慶;中高層鋼筋混凝土異形柱框架結(jié)構(gòu)設(shè)計(jì)方法研究[J];南京建筑工程學(xué)院學(xué)報(bào)(自然科學(xué)版);2002年01期

7 王春;框架結(jié)構(gòu)構(gòu)造措施不可忽視[J];建筑工人;2004年07期

8 李楠,李檸;不同施工順序?qū)ΜF(xiàn)澆預(yù)應(yīng)力混凝土框架結(jié)構(gòu)的影響[J];遼寧建材;2005年05期

9 姜q，

本文編號(hào)：1376560