【摘要】：針對(duì)斜板橋受到公路荷載作用,產(chǎn)生的動(dòng)力響應(yīng),本文提出了交通荷載與斜板橋的計(jì)算模型。將斜板橋視為加筋斜板結(jié)構(gòu),用Pb-2 Rayleigh-Ritz法對(duì)其振動(dòng)特性作出分析,然后運(yùn)用有限元法和Newmark-β法研究了公路荷載作用下斜板橋的動(dòng)力響應(yīng)問(wèn)題。并對(duì)行車速度、車輛軸距、車輛行駛的不同情況、橋跨長(zhǎng)度、斜交角以及路面粗糙度等因素對(duì)斜板橋的動(dòng)力響應(yīng)的影響進(jìn)行了參數(shù)分析。主要的研究?jī)?nèi)容有:(1)運(yùn)用pb-2 Rayleigh-Ritz法對(duì)加筋斜板結(jié)構(gòu)的振動(dòng)特性進(jìn)行分析,計(jì)算出結(jié)構(gòu)的自振頻率并與有限元法的結(jié)果進(jìn)行對(duì)比驗(yàn)證其精確性;(2)把公路荷載和斜板橋看作兩個(gè)分離的子系統(tǒng),分別建立了斜板橋模型和公路荷載模型,利用車橋系統(tǒng)之間的位移和力的協(xié)調(diào)條件,使車橋兩個(gè)子系統(tǒng)耦合起來(lái);(3)利用路面不平整功率譜密度函數(shù),基于Matlab平臺(tái)在時(shí)域內(nèi)模擬路面不平整,并將其作為公路荷載與斜板橋耦合振動(dòng)的激勵(lì);(4)利用Newmark-β法,對(duì)公路荷載運(yùn)動(dòng)方程方程進(jìn)行計(jì)算,得出公路荷載的響應(yīng)序列,并據(jù)此行成作用于斜板橋的力。具體實(shí)施,利用Matlab編寫(xiě)語(yǔ)言對(duì)方程進(jìn)行數(shù)值計(jì)算。最后討論了路面不平順、車速、汽車軸距、橋梁長(zhǎng)度、橋梁斜交角、等因素對(duì)斜板橋動(dòng)力響應(yīng)的影響。本文的創(chuàng)新點(diǎn)在理論上,把公路斜板橋�；癁榧咏钚卑褰Y(jié)構(gòu),運(yùn)用Pb-2Rayleigh-Ritz法對(duì)振動(dòng)特性作出分析,引入了Newmark-β法對(duì)公路荷載作用下斜板橋動(dòng)力響應(yīng)問(wèn)題進(jìn)行了數(shù)值分析。并且對(duì)影響斜板橋動(dòng)力響應(yīng)參數(shù)進(jìn)行了分析。得出的結(jié)果可以為公路斜板橋梁的設(shè)計(jì)提供理論參考和實(shí)踐指導(dǎo)。
[Abstract]:In view of the dynamic response of oblique slab bridge subjected to highway load, a calculation model of traffic load and oblique slab bridge is presented in this paper. The inclined plate bridge is regarded as reinforced inclined slab structure, and its vibration characteristics are analyzed by Pb-2 Rayleigh-Ritz method. Then the dynamic response of inclined slab bridge under highway load is studied by using finite element method and Newmark- 尾 method. The effects of driving speed, vehicle wheelbase, vehicle driving, bridge span length, angle of skew and road roughness on the dynamic response of inclined plate bridge are analyzed. The main research contents are as follows: (1) the vibration characteristics of reinforced inclined plate structure are analyzed by pb-2 Rayleigh-Ritz method. The natural vibration frequency of the structure is calculated and compared with the results of the finite element method to verify its accuracy. (2) the highway load and the inclined plate bridge are regarded as two separate subsystems, and the inclined plate bridge model and the highway load model are established respectively. Using the coordination condition of displacement and force between vehicle and bridge system, the two subsystems of vehicle and bridge are coupled. (3) using the power spectrum density function of uneven road surface, the road surface is simulated in time domain based on Matlab platform. It is regarded as the excitation of the coupling vibration of highway load and inclined plate bridge. (4) by using Newmark- 尾 method, the equation of highway load motion is calculated, and the response sequence of highway load is obtained, according to which the force acting on the inclined plate bridge is obtained. In practice, the equation is numerically calculated by Matlab programming language. Finally, the effects of road irregularity, speed, vehicle wheelbase, bridge length, bridge angle and so on the dynamic response of inclined plate bridge are discussed. The innovation of this paper is that, in theory, the inclined slab bridge is modeled as reinforced inclined slab structure, the vibration characteristic is analyzed by Pb-2Rayleigh-Ritz method, and the Newmark- 尾 method is introduced to analyze the dynamic response of inclined slab bridge under highway load. The dynamic response parameters of inclined slab bridge are analyzed. The results can provide theoretical reference and practical guidance for the design of highway inclined bridge.
【學(xué)位授予單位】：南昌工程學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U441.3

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