移動(dòng)簡(jiǎn)諧荷載列作用下簡(jiǎn)支梁豎向動(dòng)力響應(yīng)的解析解及其應(yīng)用研究
[Abstract]:Based on the moving harmonic load series model, the analytical expression of vertical dynamic response of simply supported beams is derived theoretically, and the vertical resonance of 32m standard simply supported beams of high speed railway under the action of CRH3 EMU is analyzed by using MATLAB program, and the effects of resonance frequency, moving speed of load train and damping ratio of system on resonance effect are studied. The results show that the damping ratio weakens with the increase of damping ratio, so it is not appropriate to increase the damping ratio too much in structural design. When the damping ratio is 0.02, the dynamic amplification coefficient of resonance caused by resonance frequency is more than 20, while the maximum resonance dynamic amplification coefficient caused by bridge velocity is only about 2.5. However, considering that the load amplitude of the former is only 0.2 of the corresponding load value of the latter, it is suggested that the resonance effect in the two cases should be fully considered in the actual design. Finally, the correctness of the analytical derivation is verified by comparing with the existing literature results. In this paper, the analytical formula can be used to analyze the influence of parameters directly and quickly, which provides a reference for the preliminary design.
【作者單位】: 西南交通大學(xué)土木工程學(xué)院;麥吉爾大學(xué)土木工程與應(yīng)用力學(xué)系;
【基金】:國(guó)家自然科學(xué)基金(51378429;51308469) 國(guó)家高技術(shù)發(fā)展研究“863”計(jì)劃(2011AA11A103) 教育部新世紀(jì)優(yōu)秀人才支持計(jì)劃(NCET-10-0701) 四川省杰出青年學(xué)術(shù)技術(shù)帶頭人計(jì)劃(2010JQ0018) 四川省應(yīng)用基礎(chǔ)研究(2010JY0026) 西南交通大學(xué)揚(yáng)華之星項(xiàng)目
【分類(lèi)號(hào)】:U448.217;U441
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