本文關(guān)鍵詞： 鋼橋 焊接細(xì)節(jié) 有效缺口應(yīng)力 名義應(yīng)力 疲勞評估　出處：《浙江大學(xué)學(xué)報(工學(xué)版)》2017年01期 　論文類型：期刊論文

【摘要】：為了驗證有效缺口應(yīng)力法對于鋼橋焊接構(gòu)造細(xì)節(jié)疲勞壽命評估的適用性,簡化基于S-N曲線的疲勞壽命評估程序,開展3種典型鋼橋焊接構(gòu)造細(xì)節(jié)在應(yīng)力比為0.1的條件下的高周疲勞試驗.采用ABAQUS有限元分析局部有效缺口應(yīng)力,得到不等厚對接焊接接頭、十字形非傳力角焊縫接頭和十字形傳力角焊縫接頭疲勞試樣的有效缺口應(yīng)力S-N曲線,探討局部有效缺口應(yīng)力對焊接接頭失效模式的影響.結(jié)果表明,焊接位錯量會嚴(yán)重影響十字形傳力角焊縫接頭的失效模式,采用有效缺口應(yīng)力法可以有效地區(qū)分焊根或焊趾失效;名義應(yīng)力S-N疲勞設(shè)計曲線與有效缺口應(yīng)力FAT225疲勞設(shè)計曲線相比,具有更高的安全保證.3種構(gòu)造細(xì)節(jié)的有效疲勞試驗數(shù)據(jù)表明,采用有效缺口應(yīng)力FAT200疲勞設(shè)計曲線更合理.
[Abstract]:In order to verify the applicability of the effective notch stress method to the fatigue life evaluation of steel bridge welding structure details, the fatigue life evaluation program based on S-N curve is simplified. The high cycle fatigue tests of three typical steel bridges under the condition of stress ratio of 0. 1 are carried out. The local effective notch stress is analyzed by ABAQUS finite element method, and the welded joints with unequal thickness are obtained. The effective notched stress S-N curves of the fatigue specimens of cross-shaped non-force-transfer fillet welds and cross-force-transfer fillet welds are studied. The effect of local effective notch stresses on the failure modes of welded joints is discussed. The results show that, The amount of welding dislocation will seriously affect the failure mode of cross-shaped force-transfer fillet weld joint. The effective notch stress method can effectively distinguish the weld root or toe failure. Compared with the effective notch stress FAT225 fatigue design curve, the nominal stress S-N fatigue design curve is more safe than the effective notch stress FAT225 fatigue design curve. The effective fatigue test data of three kinds of structural details show that the effective notch stress FAT200 fatigue design curve is more reasonable.
【作者單位】： 清華大學(xué)土木工程安全與耐久教育部重點實驗室;天津大學(xué)濱海土木工程結(jié)構(gòu)與安全教育部重點實驗室;
【基金】：國家自然科學(xué)基金資助項目(51378289;51678339) 高等學(xué)校博士學(xué)科點專項科研基金資助項目(20130002110085)
【分類號】：U445.583

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