单伸缩缝桥梁连续配筋接线路面温度效应

发布时间：2018-08-18 09:28

【摘要】：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。
[Abstract]:In order to expand the use range of the whole seamless bridge, a new bridge form, single expansion joint bridge, which is suitable for bridge length less than 300m, is proposed. The connection pavement is an important component of absorbing the temperature deformation of the main beam in the bridge with single expansion joint. Based on the theory of concrete bond-slip, the formula for calculating the stress and crack width of the connection pavement under the action of temperature drop is derived. At the same time, a full-scale model test was carried out to simulate the effect of temperature drop. The results show that the theoretical calculation value of concrete stress is slightly larger than the experimental value, the maximum relative error is -6.88, the theoretical calculation value can accurately reflect the actual stress condition, and the cracks of the connecting road surface all appear at the sawing joint, The maximum crack width is 0.262 mm, which is far less than the allowable value of 0.5 mm, and the connecting pavement has better absorbing deformation ability, and the stress difference exists on the upper and lower surface of the concrete, and the maximum stress difference is 0.188 MPA. The method of segment reinforcement is recommended in the design.
【作者单位】：湖南大学土木工程学院;清远市公路勘察规划设计院;
【基金】：国家自然科学基金项目(51078135) 交通运输部西部交通建设科技项目(2009 318 000 044) 广东省交通运输厅科技项目(科技2012-04-012) 清远市产学研结合项目(2011D021113001)
【分类号】：U443.3

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