CAJ | 학술논문

针对再生混凝土与普通混凝土在结构体系中的协同工作问题，对由混凝土收缩原因引起的再生混凝土与普通混凝土叠合构件变形及结合面剪力问题进行了研究，重点分析结合面上剪应力产生的原因、分布特点、工程影响及其计算公式，并与实际叠合试件的试验数据做了对比分析。结果表明，叠合构件中再生混凝土层的收缩量及收缩稳定期均小于同等条件下自由干缩的再生混凝土，其结合面剪应力分布沿轴线方向随着构件尺寸变化增加明显，构件边缘处的剪应力值最大，从边缘向中部逐渐减小。在实际工程中，可通过合理控制叠合构件的长度和混凝土的配合比等方式，将结合面剪应力控制在允许范围内。
침대재생혼응토여보통혼응토재결구체계중적협동공작문제，대유혼응토수축원인인기적재생혼응토여보통혼응토첩합구건변형급결합면전력문제진행료연구，중점분석결합면상전응력산생적원인、분포특점、공정영향급기계산공식，병여실제첩합시건적시험수거주료대비분석。결과표명，첩합구건중재생혼응토층적수축량급수축은정기균소우동등조건하자유간축적재생혼응토，기결합면전응력분포연축선방향수착구건척촌변화증가명현，구건변연처적전응력치최대，종변연향중부축점감소。재실제공정중，가통과합리공제첩합구건적장도화혼응토적배합비등방식，장결합면전응력공제재윤허범위내。
Aiming at the problem of RC (recycled concrete) and OC (ordinary concrete) cooperative work in struc?tural system, this paper studied the problems of deformation caused by dry shrinkage of the RC and OC composite components and shear stress on the interface. It specifically analyzed the characteristics of the causes, distribu?tion, engineering effects and calculation formula, and compared with the actual test data. The results show that, under the same condition, shrinkage value and stabilization period of the RC part in composite components were less than the RC free shrinkage. Shear stress increased significantly along the axial line direction with the change of component size, and the shear stress reached a maximum on the edges of interface, and it gradually decreased from the edge to the central. In practical engineering, controlling the length of the composite components and pro?portions of concrete mix reasonably would make the shear stress within the allowable range.