發(fā)布時(shí)間：2018-11-19 21:23

【摘要】：鋼橋面板具有自重輕、承載極限大等優(yōu)點(diǎn)，現(xiàn)已廣泛應(yīng)用于國內(nèi)外橋梁中。在組成橋梁的橋面板間，一般都是通過焊縫進(jìn)行連接的，由此產(chǎn)生的殘余應(yīng)力降低了結(jié)構(gòu)的安全性能，同時(shí)，作為橋梁的重要組成部分，，橋面板還時(shí)刻承受著車輛的反復(fù)荷載作用。所以，準(zhǔn)確的模擬鋼橋面板間的殘余應(yīng)力，分析其對疲勞強(qiáng)度的影響，可以對延長橋梁的使用壽命，提高結(jié)構(gòu)承載力和安全性提供參考。 本文通過ANSYS，對不同焊接條件下帶U形肋的鋼橋面板進(jìn)行了殘余應(yīng)力以及疲勞強(qiáng)度分析。以實(shí)際工程為例建立了帶U形肋的橋面板模型，通過編制APDL語言進(jìn)行了不同焊接工藝條件下焊縫殘余應(yīng)力場模擬分析，對比分析各殘余應(yīng)力曲線的分布規(guī)律及大小變化，最終發(fā)現(xiàn)在其他焊接工藝條件不變的前提下：增大焊接速度，焊后產(chǎn)生的殘余應(yīng)力增大；減小焊接電流、電壓或?qū)⒙窕∽詣?dòng)焊改為二氧化碳?xì)怏w保護(hù)焊，焊后產(chǎn)生的殘余應(yīng)力減小。改變焊接工藝條件，焊接殘余應(yīng)力的分布規(guī)律大體相近。通過參考大量的文獻(xiàn)，對比分析了各種鋼橋疲勞壽命的分析方法，系統(tǒng)評估了其中的疲勞荷載模擬加載、疲勞破壞點(diǎn)的確認(rèn)、雨流計(jì)數(shù)法、S-N曲線等關(guān)鍵問題，并通過對模型的實(shí)際加載模擬，最終確認(rèn)了帶U肋的橋面板在有無殘余應(yīng)力條件下的疲勞破壞點(diǎn)及疲勞壽命。并通過最終的對比分析，確定了焊接殘余應(yīng)力對結(jié)構(gòu)疲勞壽命的影響。 本論文的模擬可以為優(yōu)化結(jié)構(gòu)和改進(jìn)焊接工藝提供參考，以提高鋼橋的使用壽命。
[Abstract]:Steel bridge panel has been widely used in bridges at home and abroad for its advantages of light weight and high bearing limit. In general, the bridge deck is connected by welding seam, which reduces the safety performance of the bridge, and is an important part of the bridge, and the residual stress caused by the residual stress decreases the safety performance of the structure, at the same time, it is an important part of the bridge. The bridge deck still bears the repeated load of the vehicle at all times. Therefore, the accurate simulation of the residual stress between steel bridge panels and the analysis of its influence on fatigue strength can provide a reference for prolonging the service life of the bridge and improving the bearing capacity and safety of the structure. In this paper, the residual stress and fatigue strength of steel bridge face with U-shaped rib under different welding conditions are analyzed by ANSYS,. The model of bridge deck with U-shaped rib is established by taking the actual project as an example. The residual stress field of welding seam under different welding process conditions is simulated and analyzed by APDL language, and the distribution law and size change of each residual stress curve are compared and analyzed. Finally, it is found that the residual stress after welding increases with the increase of welding speed. Reducing welding current and voltage or changing automatic submerged arc welding to carbon dioxide gas shielded welding will reduce the residual stress after welding. The distribution of welding residual stress is similar to that of welding process condition. By referring to a large number of references, the fatigue life analysis methods of various steel bridges are compared and analyzed. The key problems of fatigue load simulation loading, fatigue failure point confirmation, rain flow counting method, S-N curve and so on are systematically evaluated. Finally, the fatigue failure point and fatigue life of the bridge slab with U-rib under the condition of residual stress or not are confirmed by the actual loading simulation of the model. The influence of welding residual stress on the fatigue life of the structure is determined by the final comparative analysis. The simulation of this paper can provide reference for optimizing structure and improving welding process to improve the service life of steel bridge.
【學(xué)位授予單位】：燕山大學(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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