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为扩大全无缝桥梁的使用范围,提出一种适用于桥长小于300m的桥梁形式——单伸缩缝桥梁。接线路面是单伸缩缝桥梁中吸纳主梁温度变形的重要构件,基于混凝土粘结-滑移理论,推导了温降作用下接线路面的应力及裂缝宽度计算公式,同时开展了模拟温降作用的足尺模型试验。研究结果表明:混凝土应力的理论计算值略大于试验值,最大相对误差为-6.88%,理论计算值能较准确地反映实际受力状况;接线路面的裂缝均出现在锯缝处,最大裂缝宽度为0.262mm,远小于容许值0.5mm,接线路面有较好的吸纳变形能力;接线路面混凝土上、下表面存在应力差,最大应力差为0.188MPa,设计时推荐采用分节段配筋的方法。
In order to expand the scope of application of totally seamless bridges, a bridge form suitable for bridge length less than 300m is proposed. The connection pavement is an important component to absorb the temperature deformation of the main girder in a single expansion joint. Based on the bond-slip theory of concrete, the formula for calculating the stress and crack width of the pavement under the temperature drop is deduced. Simultaneously, Full-scale model test. The results show that the theoretical calculated value of concrete stress is slightly larger than the test value, the maximum relative error is -6.88%, and the theoretical calculation value can accurately reflect the actual stress condition. The cracks in the joint surface appear at the kerf and the maximum crack width Is 0.262mm, far less than the allowable value of 0.5mm, the wiring of the road to better absorb the deformation capacity; wiring pavement concrete, the lower surface of the stress difference, the maximum stress difference of 0.188MPa, the design recommended sub-section reinforcement method .