本文關(guān)鍵詞： 混凝土 中小跨徑橋梁 疲勞荷載 疲勞性能 鉸縫 鉸接板梁法 荷載橫向分布 時變可靠度　出處：《浙江大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：在當前的橋梁結(jié)構(gòu)設(shè)計與維護管理中,人們往往重視鋼結(jié)構(gòu)的疲勞問題,而忽視混凝土結(jié)構(gòu)的疲勞性能。隨著交通荷載的增長,其承載力隨時間退化,也會產(chǎn)生疲勞安全問題。尤其是像多梁式混凝土梁橋的橫向連接鉸縫,屬于結(jié)構(gòu)的薄弱部位,在環(huán)境腐蝕和疲勞荷載作用下,容易出現(xiàn)各類病害。本文在浙江省交通運輸廳科技項目“中小跨徑混凝土橋梁性能維護的關(guān)鍵技術(shù)及應(yīng)用研究”的資助下,對衢州地區(qū)典型的國省道交通狀況進行調(diào)研統(tǒng)計,對標準疲勞車輛模型進行了推導(dǎo),同時對預(yù)應(yīng)力空心板梁橋開裂機理展開研究與討論,結(jié)合考慮鉸縫抗剪剛度的鉸接板梁法,對橫向分布時變規(guī)律和疲勞時變可靠度進行了研究。主要研究工作及成果如下： 1)根據(jù)對衢州地區(qū)典型國省道交通狀況的統(tǒng)計,提出了疲勞車輛荷載譜和對應(yīng)的交通量；依據(jù)疲勞損傷等效原則,推導(dǎo)了適用于不同道路類型的標準疲勞車輛模型,具有較高的準確性和適用性,并和其他標準疲勞車輛模型進行了對比分析。 2)在標準疲勞車輛模型基礎(chǔ)上,從靜力和疲勞角度對多梁式混凝土橋梁結(jié)構(gòu)開裂機理進行了分析研究,提出了基于鉸縫疲勞破壞的預(yù)應(yīng)力空心板梁橋壽命預(yù)測方法。結(jié)果顯示在新規(guī)范靜力設(shè)計荷載作用下橋面不會開裂；疲勞車輛作用下,混凝土鉸縫疲勞損傷將加速結(jié)構(gòu)的早期開裂；通過對疲勞影響因素的探討,發(fā)現(xiàn)適當加大鋪裝層厚度和施加橫向預(yù)應(yīng)力可以提高這類結(jié)構(gòu)的疲勞壽命。 3)基于混凝土、鋼筋材料特性及板梁鉸縫粘結(jié)剛度的劣化模型,得到環(huán)境腐蝕和疲勞作用下不同形式混凝土鉸縫的抗剪剛度退化模型；通過對鉸縫抗剪承載力的數(shù)值分析,發(fā)現(xiàn)構(gòu)造較淺的混凝土鉸縫的抗剪承載力遠小于構(gòu)造較深的混凝土鉸縫,鉸縫鋼筋雖然對彈性階段受力影響不大,但能顯著提高構(gòu)件的抗剪承載力。 4)根據(jù)得到的多梁式混凝土鉸縫抗剪剛度退化模型,對橋梁橫向分布影響線的時變規(guī)律進行了研究,將考慮鉸縫抗剪剛度的鉸接板梁法計算結(jié)果和梁格法以及有限元實體模型的分析結(jié)果進行了對比,結(jié)果吻合良好；在此基礎(chǔ)上將有關(guān)成果進一步應(yīng)用到混凝土橋梁結(jié)構(gòu)疲勞時變可靠度的計算中。
[Abstract]:In the current bridge structure design and maintenance management, people often pay attention to the fatigue problem of steel structure, but ignore the fatigue performance of concrete structure. With the increase of traffic load, its bearing capacity degenerates with time. Especially the transverse joint joint of multi-beam concrete beam bridge belongs to the weak part of the structure under the action of environmental corrosion and fatigue load. This paper is supported by "key Technology and Application Research on performance maintenance of medium and small Span concrete Bridges", Science and Technology Project of Zhejiang Transportation Department. The traffic situation of typical provincial roads in Quzhou is investigated and statistics, the standard fatigue vehicle model is deduced, and the cracking mechanism of prestressed hollow slab girder bridge is studied and discussed. Combined with the hinged slab beam method considering the shear stiffness of hinged joints, the time-varying rule of transverse distribution and the time-varying reliability of fatigue are studied. The main work and results are as follows: 1) according to the traffic statistics of typical provincial roads in Quzhou, the fatigue vehicle load spectrum and the corresponding traffic volume are put forward. According to the principle of equivalent fatigue damage, the standard fatigue vehicle models suitable for different road types are derived, which have higher accuracy and applicability, and are compared with other standard fatigue vehicle models. 2) on the basis of standard fatigue vehicle model, the cracking mechanism of multi-beam concrete bridge structure is analyzed and studied from static and fatigue point of view. The life prediction method of prestressed hollow slab girder bridge based on hinge joint fatigue failure is proposed. The results show that the bridge deck will not crack under the static design load of the new code. Under the action of fatigue vehicle, the fatigue damage of concrete hinge joints will accelerate the early cracking of the structure. It is found that the fatigue life of this kind of structure can be improved by increasing the thickness of pavement and applying transverse prestressing force. 3) based on the deterioration model of concrete, steel bar material characteristics and bond stiffness of slab beam hinge joint, the degradation model of shear stiffness of different forms of concrete hinge joints under the action of environmental corrosion and fatigue is obtained. Through the numerical analysis of shear bearing capacity of hinged joints, it is found that shearing capacity of shallower concrete joints is much smaller than that of deeper concrete joints, and the reinforcement of hinged joints has little effect on the stress in elastic stage. But it can significantly improve the shear capacity of the members. 4) according to the degradation model of shear stiffness of multi-beam concrete hinge joints, the time-varying law of the influence line of bridge transverse distribution is studied. The calculation results of hinged plate beam method considering the shear stiffness of hinged joints are compared with those of the beam method and the finite element solid model, and the results are in good agreement. On this basis, the related results are further applied to the calculation of fatigue time-varying reliability of concrete bridge structures.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U441.4

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