混凝土在凝结硬化成型过程中,易产生有害的裂缝,影响材料的耐久性,降低结构可靠度,为保证结构长期的安全使用,避免有害裂缝的产生,需要对混凝土早期所产生的裂缝进行控制。通过对上海长江隧桥工程中70 m箱梁混凝土硬化过程的温度及应力有限元数值模拟分析,并结合现场监测数据,对比分析了超长箱梁混凝土凝结硬化过程中内部温度及应变的变化过程。 Concrete in the condensation hardening process, easy to produce harmful cracks, affecting the durability of the material and reduce the structural reliability, in order to ensure the long-term safe use of the structure, to avoid harmful cracks, the need for concrete cracks generated early control. Through the finite element analysis of temperature and stress of the 70 m box girder in Shanghai Yangtze River Tunnel Project, the change process of internal temperature and strain in the ultra-long box girder concrete during the setting and hardening process was analyzed with the monitoring data .