【摘要】：鋼筋混凝土框架結(jié)構(gòu)具有傳統(tǒng)的空間布局和承載方式,目前被廣泛應用于建筑結(jié)構(gòu)的承重體系中�？蚣苤鳛榭蚣芙Y(jié)構(gòu)的主要受力構(gòu)件,在役期間可能會遭到意外的沖擊。汽車的撞擊是一種常見的沖擊荷載,研究鋼筋混凝土結(jié)構(gòu)在汽車撞擊作用下的性能具有重要的意義。基于此,本文運用顯式動力分析軟件LS-DYNA首先建立了汽車-鋼筋混凝土柱的有限元模型,并驗證了模型的有效性,然后對以下問題進行了研究:(1)采用參數(shù)化分析方法研究了汽車撞擊速度、撞擊角度、混凝土軸心抗壓強度、柱截面慣性矩以及配箍率等參數(shù)對汽車碰撞力和鋼筋混凝土柱在汽車撞擊作用下的動力響應的影響;(2)研究了不同車型撞擊作用下鋼筋混凝土柱的破壞模式,分析了鋼筋混凝土柱耐撞性差的主要原因,提出了兩種提高鋼筋混凝土柱耐撞性能的措施,并對該措施的有效性加以驗證;(3)采用多尺度建模的方法,建立了鋼筋混凝土框架結(jié)構(gòu)的整體有限元模型,對框架結(jié)構(gòu)在底層柱遭到車輛撞擊作用后的倒塌進行分析。研究的結(jié)果表明:鋼筋混凝土柱的位移響應會隨著汽車撞擊角度的增大而增大;提高柱子截面慣性矩和混凝土軸心抗壓強度均能顯著降低柱子的位移響應,而適當提高柱子配箍率的效果卻不明顯;汽車碰撞力受車速、撞擊角度、汽車噸位以及柱截面慣性矩的影響,其中,柱截面慣性矩對汽車碰撞力的影響最為顯著;我國規(guī)范對汽車碰撞力的取值略顯不足;不同車型撞擊作用下鋼筋混凝土柱的破壞模式不同,混凝土的剝落是導致鋼筋混凝土柱耐撞性差的主要原因;鋼筋混凝土框架結(jié)構(gòu)在底層角柱遭到車輛撞擊作用后會發(fā)生局部性倒塌。
[Abstract]:Reinforced concrete frame structure is widely used in load-bearing system because of its traditional spatial layout and bearing mode. As the main force member of frame structure, frame column may be accidentally impacted during service. Automobile impact is a common impact load. It is of great significance to study the performance of reinforced concrete structure under automobile impact. Based on this, an explicit dynamic analysis software LS-DYNA is used to establish the finite element model of the automobile reinforced concrete column, and the validity of the model is verified. Then the following problems are studied: (1) the impact velocity, impact angle and compressive strength of concrete axis are studied by parameterized analysis method. The influence of parameters such as moment of inertia and hoop ratio on the dynamic response of reinforced concrete columns under automobile impact is studied. (2) the failure modes of reinforced concrete columns under different impact modes are studied. The main reasons for the poor crashworthiness of reinforced concrete columns are analyzed. Two measures to improve the crashworthiness of reinforced concrete columns are put forward, and the effectiveness of the measures is verified. (3) the multi-scale modeling method is used. The integral finite element model of reinforced concrete frame structure is established, and the collapse of frame structure after the bottom column is hit by vehicle is analyzed. The results show that the displacement response of reinforced concrete columns will increase with the increase of the impact angle of the automobile, and the displacement response of the columns can be significantly reduced by increasing the moment of inertia of the column section and the compressive strength of the concrete axis. However, the effect of properly increasing the ratio of column hoop is not obvious. The impact force is affected by vehicle speed, impact angle, vehicle tonnage and the moment of inertia of column section, among which the impact force of column section is the most significant. The failure modes of reinforced concrete columns under different impact models are different and the spalling of concrete is the main reason for the poor crashworthiness of reinforced concrete columns. The reinforced concrete frame structure will collapse locally after the bottom corner column is impacted by the vehicle.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU375

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