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为确保混凝土筏基的抗裂性能满足结构的耐久性、地下结构的抗渗漏性及外观质量要求,有必要按相关技术标准的要求验算并控制裂缝最大宽度。目前结构设计中,对允许带裂缝工作的混凝土筏基,通常主要凭经验预留温度后浇带控制裂缝,而较少按最不利工况验算裂缝最大宽度,或验算条件与内力组合有误,这是近年常见混凝土筏基局部裂损的重要原因。基于技术分析,结合实际工程设计复核,对混凝土筏基抗裂验算中的组合拉应力、地下水浮力作用、裂缝宽度控制标准、温度后浇带效能等诸问题进行研究和讨论。
In order to ensure the crack resistance of concrete raft foundation to meet the durability of the structure, the leakage resistance of underground structures and the appearance quality requirements, it is necessary to check and control the maximum width of cracks according to the requirements of relevant technical standards. In the current structural design, concrete rafts that allow work with cracks are usually reserved mainly with temperature control and then controlled with cracks. However, the maximum width of cracks is less checked according to the most unfavorable conditions or the combination of checking conditions and internal forces is incorrect. This is a common cause of local cracking of concrete rafts in recent years. Based on the technical analysis, combined with the actual engineering design review, the problems of combined tensile stress, groundwater buoyancy, crack width control standard and post-temperature pouring zone performance in concrete raft foundation crack checking are studied and discussed.