本文選題：預(yù)應(yīng)力混凝土簡(jiǎn)支梁 + 運(yùn)營(yíng)狀態(tài)��； 參考：《長(zhǎng)沙理工大學(xué)》2014年碩士論文

【摘要】：隨著交通運(yùn)輸求的急劇擴(kuò)增,為了追求利益和效率最大化,車輛運(yùn)營(yíng)狀態(tài)呈現(xiàn)出車流量大、超速和超載超限嚴(yán)重等特征。服役期橋梁長(zhǎng)期處于高頻和高應(yīng)力幅的交變荷載作用下,導(dǎo)致橋梁疲勞壽命急劇縮減。因此,車輛運(yùn)營(yíng)狀態(tài)對(duì)橋梁的疲勞性能的影響的研究意義重大。本文基于有限元理論和實(shí)測(cè)交通統(tǒng)計(jì)數(shù)據(jù),研究?jī)?nèi)容如下：(1)總結(jié)了預(yù)應(yīng)力混凝土結(jié)構(gòu)的疲勞損傷理論。(2)以實(shí)際車輛模型為研究對(duì)象,運(yùn)用剛性梁學(xué)法,計(jì)算多軸車輛不同超載率下車輛軸荷的分配比例。在此基礎(chǔ)上,通過有限元模型分析了5種代表性車輛在不同超載率下對(duì)預(yù)應(yīng)力簡(jiǎn)支梁橋的疲勞損傷的影響。最后,推導(dǎo)多軸車輛超載率與簡(jiǎn)支梁橋的疲勞損傷倍數(shù)關(guān)系式。(3)分析了多軸車輛行車車速、行車間距、連續(xù)車流和橋梁跨徑等參數(shù)對(duì)預(yù)應(yīng)力簡(jiǎn)支梁橋疲勞性能的影響。并提出了考慮多車同時(shí)上橋時(shí),橋梁的疲勞累計(jì)損傷公式。車速對(duì)橋梁疲勞性能的影響源于車速對(duì)動(dòng)力系數(shù)的改變。車速對(duì)橋梁結(jié)構(gòu)的疲勞損傷影響不是呈線性增長(zhǎng)的,在一定范圍內(nèi)出現(xiàn)峰值。其他條件相同的情況下,連續(xù)車流量越大,車流對(duì)橋梁造成的疲勞損傷值越小。橋梁跨徑對(duì)疲勞損傷的影響,除了本身截面設(shè)計(jì)特征值以外,與車輛軸距分布密切相關(guān)。(4)基于WIM(動(dòng)態(tài)稱重系統(tǒng)),統(tǒng)計(jì)得到了宜瀘高速南溪路段交通量數(shù)據(jù),分析了該路段車輛分布類型及比例、各車型的行車車速、實(shí)時(shí)交通流量、車輛總重以及各軸軸重。運(yùn)用高斯混合模型描述各車輛類型的總重和軸重概率分布,并計(jì)算得出宜瀘高速6種的標(biāo)準(zhǔn)疲勞車輛模型。在此基礎(chǔ)上,對(duì)宜瀘高速某預(yù)應(yīng)力簡(jiǎn)支梁橋進(jìn)行了疲勞壽命評(píng)估。
[Abstract]:With the rapid expansion of traffic and transportation, in order to maximize the benefits and efficiency, the vehicle operating state presents the characteristics of large traffic, overspeed and serious overload. The bridge fatigue life of the service period is reduced sharply because of the high frequency and high stress amplitude under the alternating load for a long time. Therefore, it is of great significance to study the influence of vehicle operation state on the fatigue performance of bridges. Based on the finite element theory and traffic statistics, the research contents are as follows: (1) the fatigue damage theory of prestressed concrete structures is summarized. (2) taking the actual vehicle model as the research object, the rigid beam method is used. The distribution ratio of axle load of multi-axle vehicle with different overload ratio is calculated. On the basis of this, the influence of five representative vehicles on the fatigue damage of prestressed simply supported beam bridge under different overloading rates is analyzed by finite element model. Finally, the relationship between the overloading ratio of multi-axle vehicles and fatigue damage multiple of simply supported beam bridges is derived. The effects of multi-axle vehicle driving speed, driving distance, continuous traffic flow and bridge span on the fatigue performance of prestressed simply supported beam bridges are analyzed. The fatigue cumulative damage formula of the bridge is presented when multiple vehicles are taken into account at the same time. The influence of speed on the fatigue performance of bridge is due to the change of speed to dynamic coefficient. The effect of speed on fatigue damage of bridge structure is not linearly increased, and the peak value appears in a certain range. When other conditions are the same, the fatigue damage value of the bridge caused by the traffic flow is smaller with the increase of the continuous traffic flow. The influence of bridge span on fatigue damage is closely related to the vehicle wheelbase distribution in addition to the design eigenvalue of its own section. Based on WIM-based dynamic weighing system, traffic volume data of Nanxi section of Yi-Lu-expressway are statistically obtained. The distribution type and proportion of vehicles, driving speed, real time traffic flow, total vehicle weight and axle load of each vehicle are analyzed. The Gao Si hybrid model is used to describe the probability distribution of total weight and axle weight of each vehicle type, and six kinds of standard fatigue vehicle models for Yilu High Speed are calculated. On this basis, the fatigue life of a prestressed simply supported beam bridge is evaluated.
【學(xué)位授予單位】：長(zhǎng)沙理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441.4

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本文編號(hào)：1891972