風(fēng)雨激振時(shí)拉索響應(yīng)、升力及水膜形態(tài)研究
發(fā)布時(shí)間：2019-06-05 10:49
【摘要】：風(fēng)雨激振涉及到氣、液、固3種相態(tài)的相互耦合作用,在數(shù)值模擬方面存在困難.在水膜形態(tài)與拉索振動(dòng)雙向耦合方程的基礎(chǔ)上,應(yīng)用有限差分法求解;在保證精度的前提下,提高增量步長(zhǎng),大幅減少計(jì)算時(shí)間;應(yīng)用有限元軟件COMSOL求解隨時(shí)間變化的風(fēng)壓力系數(shù)和風(fēng)摩擦力系數(shù);分別研究了特定風(fēng)速下的拉索振動(dòng)響應(yīng)、拉索升力以及水膜形態(tài)變化,并分析了三者之間的關(guān)系,以揭示風(fēng)雨激振的產(chǎn)生機(jī)理.獲得了基于雙向耦合方程的拉索振動(dòng)持續(xù)140s的數(shù)值模擬結(jié)果.結(jié)果表明:拉索表面水膜形態(tài)的周期性變化導(dǎo)致拉索升力的周期性變化,從而引起拉索的大幅度振動(dòng);水線與拉索間的共振是產(chǎn)生風(fēng)雨激振現(xiàn)象的主要原因.
[Abstract]:The wind-rain excitation is involved in the mutual coupling of gas, liquid and solid phases, and it is difficult to simulate the numerical simulation. On the basis of the two-way coupling equation of the water film and the cable vibration, the finite difference method is applied to solve the problem, and on the premise of ensuring the accuracy, the increment step size is improved, the calculation time is greatly reduced, and the wind pressure coefficient and the wind friction coefficient with time change are solved by using the finite element software COMSOL; The vibration response of the cable, the lift of the cable and the change of the water film are studied respectively, and the relation among the three is analyzed to reveal the mechanism of the wind and rain excitation. The numerical simulation results of the cable vibration for 140 s based on the two-way coupling equation are obtained. The results show that the periodic variation of the water film morphology of the cable leads to the periodic variation of the lift of the cable, resulting in a large vibration of the cable, and the resonance between the waterline and the cable is the main cause of the wind and rain excitation.
【作者單位】： 天津大學(xué)建筑工程學(xué)院;濱海土木工程結(jié)構(gòu)與安全教育部重點(diǎn)實(shí)驗(yàn)室(天津大學(xué));天津城建大學(xué)天津市土木建筑結(jié)構(gòu)防護(hù)與加固重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51408399)~~
【分類號(hào)】：U441.3
[Abstract]:The wind-rain excitation is involved in the mutual coupling of gas, liquid and solid phases, and it is difficult to simulate the numerical simulation. On the basis of the two-way coupling equation of the water film and the cable vibration, the finite difference method is applied to solve the problem, and on the premise of ensuring the accuracy, the increment step size is improved, the calculation time is greatly reduced, and the wind pressure coefficient and the wind friction coefficient with time change are solved by using the finite element software COMSOL; The vibration response of the cable, the lift of the cable and the change of the water film are studied respectively, and the relation among the three is analyzed to reveal the mechanism of the wind and rain excitation. The numerical simulation results of the cable vibration for 140 s based on the two-way coupling equation are obtained. The results show that the periodic variation of the water film morphology of the cable leads to the periodic variation of the lift of the cable, resulting in a large vibration of the cable, and the resonance between the waterline and the cable is the main cause of the wind and rain excitation.
【作者單位】： 天津大學(xué)建筑工程學(xué)院;濱海土木工程結(jié)構(gòu)與安全教育部重點(diǎn)實(shí)驗(yàn)室(天津大學(xué));天津城建大學(xué)天津市土木建筑結(jié)構(gòu)防護(hù)與加固重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51408399)~~
【分類號(hào)】：U441.3
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