大跨徑覆土波形鋼板橋涵的靜力和動(dòng)力分析
發(fā)布時(shí)間：2019-01-05 14:57
【摘要】：覆土波形鋼板橋涵具有施工快、建造和維修費(fèi)用低和造型優(yōu)美等優(yōu)勢而在國內(nèi)外廣泛地應(yīng)用于公路和鐵路工程。由于應(yīng)用及研究起步較晚,相比國外一些發(fā)達(dá)國家,我國的研究狀況較為滯后。當(dāng)前國內(nèi)靜力方面研究的大多是中小跨徑橋涵受力特性;動(dòng)力方面主要是沖擊系數(shù)及自振特性的研究,對于在地震作用下結(jié)構(gòu)的受力性能的研究較少。因此,對于大跨徑覆土波形鋼板橋涵的靜力和動(dòng)力尤其是抗震性能的研究很有必要。本文對一跨徑為12m的圓弧型覆土波形鋼板橋涵建立了三維模型進(jìn)行了靜力分析,通過有限元模型計(jì)算,得到了最大壓應(yīng)力在波形鋼板中的分布規(guī)律。對比了 ANSYS計(jì)算出的最大壓應(yīng)力與AISI和CHBDC兩規(guī)范的差異,并且分析了出現(xiàn)差異的原因,結(jié)果表明ANSYS計(jì)算的結(jié)果比較可靠。建立了二維有限元模型,分析了覆土波形鋼板結(jié)構(gòu)中影響波形鋼板拱頂豎向變形及應(yīng)力的因素。結(jié)果表明:波形鋼板的豎向變形隨填土厚度的增加而增大,隨回填土變形模量、波形尺寸、壁厚的增加而減小,總應(yīng)力隨填土厚度的增加而增大,并且影響顯著�？倯�(yīng)力隨壁厚增加而減小,并且影響較為顯著,土體變形模量和波形尺寸對總應(yīng)力的影響并不明顯。通過對結(jié)構(gòu)施加2條天然波和1條人工波的加速度一致激勵(lì),研究了結(jié)構(gòu)在地震作用下位移和應(yīng)力隨時(shí)間變化的規(guī)律,研究表明:結(jié)構(gòu)的最大水平位移和最大豎向位移均位于拱肩處,位移的最大值為2.78mm;水平應(yīng)力的最大值位于拱肩處,大小為0.508MPa;豎向應(yīng)力的最大值位于拱腳處,大小為0.962MPa;最大壓應(yīng)力的最大值同樣位于拱腳處,大小為0.953MPa。在地震作用下,結(jié)構(gòu)的最大變形和最大應(yīng)力均很小,說明覆土波形鋼板橋涵具有很好的抗震性能。
[Abstract]:With the advantages of fast construction, low cost of construction and maintenance, and beautiful shape, the bridge and culvert with corrugated steel plate are widely used in highway and railway engineering at home and abroad. Because of the late start of application and research, the research situation of our country lags behind that of some developed countries. At present, most of the static research in China is on the mechanical characteristics of bridge and culvert with medium and small span, while the dynamic aspects are mainly on the impact coefficient and the natural vibration characteristics, but the research on the mechanical behavior of the structure under earthquake action is less. Therefore, it is necessary to study the static and dynamic behavior, especially the seismic behavior of long span soil covered corrugated steel plate bridges and culverts. In this paper, a three-dimensional model of a curved corrugated steel plate bridge and culvert with a span of 12 m is established. The distribution of the maximum compressive stress in the corrugated steel plate is obtained by finite element model calculation. The difference between the maximum compressive stress calculated by ANSYS and that of AISI and CHBDC is compared, and the reasons for the difference are analyzed. The results show that the results of ANSYS calculation are reliable. A two-dimensional finite element model was established and the factors affecting vertical deformation and stress of the corrugated steel plate vault were analyzed. The results show that the vertical deformation of the corrugated steel plate increases with the increase of the fill thickness, decreases with the increase of the deformation modulus, wave size and wall thickness of the backfill, and the total stress increases with the increase of the fill thickness, and the effect is significant. The total stress decreases with the increase of wall thickness, and the influence is obvious, but the influence of deformation modulus and waveform size on the total stress is not obvious. By applying the acceleration of two natural waves and one artificial wave to the structure, the variation of displacement and stress with time under earthquake is studied. The results show that the maximum horizontal displacement and the maximum vertical displacement are located at the arch shoulder and the maximum displacement is 2.78 mm. The maximum value of horizontal stress is at the arch shoulder with the size of 0.508MPa, the maximum of vertical stress is at the arch foot (0.962MPa), and the maximum of the maximum compressive stress is also located at the arch foot (0.953MPa). The maximum deformation and maximum stress of the structure are very small under the action of earthquake, which indicates that the bridge and culvert with corrugated steel plate have good seismic performance.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U448.36
本文編號：2401920
[Abstract]:With the advantages of fast construction, low cost of construction and maintenance, and beautiful shape, the bridge and culvert with corrugated steel plate are widely used in highway and railway engineering at home and abroad. Because of the late start of application and research, the research situation of our country lags behind that of some developed countries. At present, most of the static research in China is on the mechanical characteristics of bridge and culvert with medium and small span, while the dynamic aspects are mainly on the impact coefficient and the natural vibration characteristics, but the research on the mechanical behavior of the structure under earthquake action is less. Therefore, it is necessary to study the static and dynamic behavior, especially the seismic behavior of long span soil covered corrugated steel plate bridges and culverts. In this paper, a three-dimensional model of a curved corrugated steel plate bridge and culvert with a span of 12 m is established. The distribution of the maximum compressive stress in the corrugated steel plate is obtained by finite element model calculation. The difference between the maximum compressive stress calculated by ANSYS and that of AISI and CHBDC is compared, and the reasons for the difference are analyzed. The results show that the results of ANSYS calculation are reliable. A two-dimensional finite element model was established and the factors affecting vertical deformation and stress of the corrugated steel plate vault were analyzed. The results show that the vertical deformation of the corrugated steel plate increases with the increase of the fill thickness, decreases with the increase of the deformation modulus, wave size and wall thickness of the backfill, and the total stress increases with the increase of the fill thickness, and the effect is significant. The total stress decreases with the increase of wall thickness, and the influence is obvious, but the influence of deformation modulus and waveform size on the total stress is not obvious. By applying the acceleration of two natural waves and one artificial wave to the structure, the variation of displacement and stress with time under earthquake is studied. The results show that the maximum horizontal displacement and the maximum vertical displacement are located at the arch shoulder and the maximum displacement is 2.78 mm. The maximum value of horizontal stress is at the arch shoulder with the size of 0.508MPa, the maximum of vertical stress is at the arch foot (0.962MPa), and the maximum of the maximum compressive stress is also located at the arch foot (0.953MPa). The maximum deformation and maximum stress of the structure are very small under the action of earthquake, which indicates that the bridge and culvert with corrugated steel plate have good seismic performance.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U448.36
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