【摘要】：近年來頻發(fā)的爆炸事件給周邊的工業(yè)民用建筑造成了極大的破壞。方鋼管螺旋箍筋混凝土柱是方鋼管混凝土柱內(nèi)部增設(shè)連續(xù)螺旋箍筋所形成的新型組合結(jié)構(gòu)柱,具有承載力高、延性好、便于梁柱連接、抗火能力強(qiáng)等優(yōu)點(diǎn),是工業(yè)民用建筑抗爆設(shè)計(jì)的理想結(jié)構(gòu)形式。目前國內(nèi)外針對方鋼管螺旋箍筋混凝土柱的研究主要集中在軸壓承載力方面,已有研究成果多是根據(jù)試驗(yàn)或數(shù)值模擬的結(jié)果進(jìn)行回歸分析得到的經(jīng)驗(yàn)公式,理論依據(jù)不是很充分。此外,鮮有方鋼管螺旋箍筋混凝土柱在爆炸沖擊等動荷載作用下性能的研究報(bào)道。本文以方鋼管螺旋箍筋混凝土柱為研究對象,針對其軸壓承載力和爆炸荷載作用下的動力響應(yīng)問題展開研究,主要內(nèi)容如下:(1)基于統(tǒng)一強(qiáng)度理論分析了方鋼管螺旋箍筋混凝土軸壓短柱的極限承載力。根據(jù)約束力構(gòu)成不同劃分了混凝土截面,綜合考慮了方鋼管和螺旋箍筋的約束。利用面積等效將方鋼管轉(zhuǎn)化為圓鋼管,在統(tǒng)一強(qiáng)度理論厚壁圓筒塑性極限荷載統(tǒng)一解的基礎(chǔ)上,推導(dǎo)了方鋼管螺旋箍筋混凝土軸壓短柱的極限承載力公式。并對公式進(jìn)行退化,擴(kuò)展了其適用范圍。最后進(jìn)行了參數(shù)分析。(2)給出爆炸荷載作用下方鋼管螺旋箍筋混凝土柱最大動位移理論解�；阡摴芑炷两y(tǒng)一理論,將組成方鋼管螺旋箍筋混凝土柱的方鋼管、螺旋箍筋、混凝土視為統(tǒng)一的組合材料,給出了構(gòu)件的塑性極限彎矩。將方鋼管螺旋箍筋混凝土柱簡化為等效單自由度體系,將爆炸荷載等效為下降三角形荷載,充分考慮了高應(yīng)變率下材料性能的提升,得到柱中部最大動位移理論解。(3)進(jìn)行了爆炸荷載作用下方鋼管螺旋箍筋混凝土柱動力響應(yīng)的數(shù)值模擬。采用Hypermesh建立了有限元模型,并通過設(shè)置應(yīng)力初始化考慮了軸壓作用的影響,利用LSDYNA Solver進(jìn)行顯式動力學(xué)分析。對軸壓柱遭受爆炸沖擊時的破壞模式、位移、應(yīng)力、應(yīng)變進(jìn)行了分析。采用單一變量法對軸壓比、材料強(qiáng)度、螺旋箍筋直徑與間距、比例距離等影響因素逐一進(jìn)行了分析,得到了影響規(guī)律并提出了設(shè)計(jì)建議。
[Abstract]:The frequent explosion in recent years has caused great damage to the surrounding industrial civil buildings. The square steel pipe spiral stirrups concrete column is a new type of composite structural column formed by adding continuous spiral stirrups inside the square steel tube concrete column. It has the advantages of high bearing capacity, good ductility, easy connection with Liang Zhu, strong fire resistance, etc. It is the ideal structure form of industrial civil building anti-explosion design. At present, the research on concrete columns with spiral stirrups of square steel tubes is mainly focused on axial bearing capacity at home and abroad. The existing research results are mostly empirical formulas obtained by regression analysis based on the results of test or numerical simulation. The theoretical basis is not very strong. In addition, there are few research reports on the behavior of concrete columns with spiral stirrups of square steel tubes under the action of explosive shock and other dynamic loads. In this paper, the dynamic response of concrete columns with spiral stirrups of square steel tubes under axial compression and explosive loads is studied. The main contents are as follows: (1) based on the unified strength theory, the ultimate bearing capacity of concrete columns with spiral stirrups is analyzed. The concrete section is divided according to the binding force composition, and the constraints of square steel pipe and spiral stirrups are considered synthetically. The square steel tube is transformed into circular steel tube by using area equivalent. On the basis of unified strength theory and unified solution of plastic limit load of thick-walled cylinder, the ultimate bearing capacity formula of spiral stirrups reinforced concrete short column of square steel tube is derived. The formula is degenerated and its scope of application is extended. Finally, the parameter analysis is carried out. (2) the theoretical solution of the maximum dynamic displacement of concrete column with spiral stirrups under explosive load is given. Based on the unified theory of concrete-filled steel tube (CFST), the square steel tube, spiral stirrups and concrete are regarded as the unified composite materials, and the plastic ultimate bending moment of the members is given. The concrete column with spiral stirrups of square steel tube is simplified as an equivalent single-degree-of-freedom system, and the explosive load is equivalent to a descending triangular load, and the improvement of material performance at high strain rate is fully considered. The theoretical solution of the maximum dynamic displacement in the middle of the column is obtained. (3) the numerical simulation of the dynamic response of the concrete column with spiral stirrups under explosive loading is carried out. The finite element model is established by Hypermesh, and the effect of axial compression is considered by setting stress initialization. The explicit dynamic analysis is carried out by LSDYNA Solver. The failure mode, displacement, stress and strain of axial columns subjected to explosion are analyzed. The influence factors such as axial compression ratio, material strength, diameter and spacing of spiral stirrups, and proportional distance are analyzed one by single variable method.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU398.9;TU352.13

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