CAJ | 학술논문

针对CRTSⅡ型板式无砟轨道施工期间连续底座板张拉过程中底座板存在变化的温度，基于有限元方法及钢筋混凝土粘结滑移理论，建立底座板混凝土-钢筋-桥梁纵向相互作用计算模型，计算分析当施工温度为5℃时，底座板钢筋和混凝土应力随温度变化和张拉过程中的变化规律。结果表明：底座板混凝土和钢筋拉力与混凝土段的长度有着直接联系，随着混凝土段长度增加，底座板混凝土和钢筋所受拉力相应变大；张拉过程中，底座板混凝土可能会在第二次张拉时开裂，而张拉连接器钢筋和齿槽后浇带钢筋未达到屈服。
침대CRTSⅡ형판식무사궤도시공기간련속저좌판장랍과정중저좌판존재변화적온도，기우유한원방법급강근혼응토점결활이이론，건립저좌판혼응토-강근-교량종향상호작용계산모형，계산분석당시공온도위5℃시，저좌판강근화혼응토응력수온도변화화장랍과정중적변화규률。결과표명：저좌판혼응토화강근랍력여혼응토단적장도유착직접련계，수착혼응토단장도증가，저좌판혼응토화강근소수랍력상응변대；장랍과정중，저좌판혼응토가능회재제이차장랍시개렬，이장랍련접기강근화치조후요대강근미체도굴복。
In view of the change of temperature in the base slab of CRTSⅡballastless track during stretching process, a model of base slab is established based on the finite element method and reinforced concrete bond-sliding theory to calculate concrete-steel-bridge longitudinal interaction. The variation of steel and concrete stresses are analyzed during the temperature changes and tensioning process when the construction temperature is 5℃. The result shows that the stresses of base slab concrete and steel are directly related to the length of the concrete section, and the stresses of steel and concrete of the base slab increase with the extension of the concrete section. During the stretching process, the concrete may crack during the second stretching, while the steels of tension connector and the alveolar late-poured zone are not yielded.