【摘要】：波形鋼腹板箱梁橋是用波形鋼腹板替代混凝土腹板或平鋼腹板的一種新型橋梁結(jié)構(gòu)。這種新型箱梁結(jié)構(gòu)有諸多優(yōu)點，例如，波形鋼腹板具有較高的抗剪及抗拉能力，徹底解決了混凝土腹板箱梁一直存在的腹板開裂問題；由于波形鋼在縱向具有褶皺效應，使得縱向剛度幾乎為零，，減少了對混凝土頂、底板的徐變、收縮約束，大大的提高了頂、底板中預應力的效應等等一些優(yōu)點。國內(nèi)外一些學者對這種結(jié)構(gòu)進行了很多的靜力方面研究，但是動力學方面一直處于滯后狀態(tài)。本文對該種結(jié)構(gòu)動力學方面做了一些研究，具體如下所述。 推導了并求解車橋耦合振動方程。車輛振動方程推導首先由簡單到復雜，依次分別為四分之一車輛模型、二分之一二軸車輛模型、二分子一三軸車輛模型、整車三軸車輛模型。將橋梁與車輛作為兩系統(tǒng)來考慮，對振動方程分開建立，并由橋梁和車輪間的接觸點幾何相容條件與力的平衡關(guān)系來進行耦合；由于直接采用橋梁的有限元幾何模型時計算自由度多，工作量也增加，為了減少計算自由度，采用模態(tài)綜合技術(shù)并運用Newmark法來求解方程。 橋面不平度被認為是影響車橋耦合振動的主要因素之一。本文運用諧波疊加法與國家標準GB/T703186對應的A、B、C三級路面不平度的重構(gòu)，并基于數(shù)值計算軟件MATLAB編制出相應的計算程序。 了解橫隔板的布置及數(shù)量對波形鋼腹板箱梁動力特性的影響。利用通用有限元軟件ANSYS建立了五種簡支箱梁模型，分別為：①無橫隔板波形鋼腹板箱梁；②三塊跨中橫隔板波形鋼腹板箱梁（橫隔板位置：1/4、1/2及3/4跨）；③兩塊端橫隔板波形鋼腹板箱梁；④五塊橫隔板波形鋼腹板箱梁(橫隔板位置：兩塊端橫隔板及1/4、1/2及3/4跨）。⑤混凝土腹板箱梁。分別提取各模型前十階振動特性進行對比分析。為了驗證Ansys軟件計算結(jié)果的準確性，還分別采用了Midas-Civil軟件對有關(guān)算例進行了分析。 以潑和大橋為工程背景，通過ANSYS建立橋梁有限元模型，分析了車輛行駛速度、路面不平順、橋梁阻尼對橋梁沖擊系數(shù)值的影響。總結(jié)了各國規(guī)范對沖擊系數(shù)的定義，得出其相應值，并且與數(shù)值解進行了對比分析。
[Abstract]:Corrugated steel web box girder bridge is a new type of bridge structure which uses corrugated steel web to replace concrete web or flat steel web. This new type of box girder structure has many advantages, for example, the corrugated steel web plate has higher shear and tensile resistance, which completely solves the web cracking problem of concrete web box girder. Because the corrugated steel has fold effect in the longitudinal direction, the longitudinal stiffness is almost zero, which reduces the creep and shrinkage constraints on the concrete roof and floor, greatly improves the roof effect and the effect of prestress in the bottom slab, and so on. Some scholars at home and abroad have done a lot of static research on this structure, but the dynamics has been lagging behind. In this paper, the dynamics of this kind of structure has been studied, as follows. The coupled vibration equation of vehicle and bridge is derived and solved. The derivation of vehicle vibration equation is from simple to complex, which are 1/4 vehicle model, two parts two axle vehicle model, two molecule one three axle vehicle model and the whole vehicle three axle vehicle model respectively. Considering the bridge and vehicle as two systems, the vibration equation is established separately and coupled by the geometric compatibility condition of the contact point between the bridge and the wheel and the balance of the force. In order to reduce the degree of freedom, the modal synthesis technique and the Newmark method are used to solve the equations in order to reduce the degree of freedom. Deck roughness is considered to be one of the main factors affecting the coupled vibration of vehicle and bridge. In this paper, the harmonic superposition method is used to reconstruct the unevenness of the third grade road surface corresponding to the national standard GB/T703186, and the corresponding calculation program is compiled based on the numerical calculation software MATLAB. To understand the influence of the layout and quantity of transverse diaphragm on the dynamic characteristics of corrugated steel web box girder. Five kinds of simply supported box girder models are established by using the general finite element software ANSYS. They are as follows: 1 box girder with no transverse diaphragm waveform steel web girder, 2 with three spans of middle transverse diaphragm steel web girder (1 / 4 / 1 / 2 and 3 / 4 span); (3) two end transverse diaphragm corrugated steel web box girders, 4 5 transverse diaphragm wave steel web box girders (transverse division board position: two end transverse divisions and 1 / 4 4 / 2 and 3 / 4 span). 5 concrete web box girders. The first ten vibration characteristics of each model were extracted for comparative analysis. In order to verify the accuracy of the calculation results of Ansys software, some examples are analyzed by using Midas-Civil software. In this paper, the finite element model of the bridge is established by ANSYS, and the influence of the vehicle speed, the road surface irregularity and the bridge damping on the impact coefficient of the bridge is analyzed. The definition of impact coefficient is summarized and the corresponding values are obtained and compared with the numerical solution.
【學位授予單位】：華東交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U441.3

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