The cable tower of Huangmao Sea cross sea passage has serious surface cracking during early curing.The cable tower is a typ-ical mass concrete,and most of its early cracking is caused by high thermal stress,that is,thermal cracks.Therefore,in order to control the early thermal cracks and take into account the corrosion of the marine environment,the BFRP grid is used to control the cracks on the sur-face of the cable tower.The crack control effect is significant and the cracking phenomenon is effectively alleviated.Although BFRP grid has been successfully applied to the thermal cracks control of mass concrete,the mechanism of BFRP grid crack control is still unclear.Based on this,ABAQUS is used to simulate the process of BFRP grid controlling thermal cracks in mass concrete,where cracks are real-ized by extended finite element method(XFEM).The simulation results show that the BFRP grid can effectively control the area,volume and number of elements of thermal cracks.With the reduction of BFRP mesh,the area,volume and number of crack elements of thermal cracks further decrease.The BFRP grid with 5 cm mesh controls only one crack.BFRP grid can effectively control cracks mainly because BFRP grid is a two-way load-bearing structure and has strong nodes.After bonding with concrete,it plays a role in coordinating the devel-opment of concrete stress,effectively homogenizing the stress distribution of concrete,and then homogenizing the development of cracks,finally achieving the effect of reducing cracks.
关键词
大体积混凝土/BFRP网格/温度裂缝/ABAQUS/扩展有限元
Key words
mass concrete/BFRP grid/thermal cracks/ABAQUS/extended finite element
维普
万方数据