超长预应力混凝土箱梁裂缝控制研究

混凝土的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,消除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70m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,对比分析了超长箱形梁混凝土凝结硬化过程中内部温度及应变的变化过程.

Research on super-long prestressed concrete box girder crack control

At the setting of concrete molding process, it is easy to produce harmful cracks, material impact on the durability and reduce the structural reliability.To ensure the structural safety of long-term use, eliminate harmful to avoid the creation of cracks, the need for early concrete from the cracks under control.Yangtze River to Shanghai TRB project 70 meters of concrete box beam hardening process temperature and finite element stress analysis,combined with the monitoring data. Comparative analysis of the super-long concrete box girder condensation process of hardening the internal temperature and strain in the process.