Experimental Research on Optimization of Continuous Deck Structures Without Expansion Devices Based on Engineered Cementitious Composites
In order to study the mechanical properties of high-ductility ECC materials instead of conventional expansion devices in continuous bridge deck structures,the depth of the post-cast groove and the presence or absence of bonding of rebars were used as variable parameters,designed and fabricated four sets of high-ductility ECC bridge deck joint plate scaled model members,conducted tests on the mechanical properties of joint plates under combined bending and tension conditions.The results showed that the top surface of the ECC joint plate showed the phenomenon of multi-point cracking with fine cracks,the crack width was within 0.2 mm,the ECC material itself exerted a better crack resistance;increasing the depth of the post-cast groove could improve the mechanical properties of the joint plate,but it weakened the ductility of the joint plate,the unbonded section of the rebars could significantly release the restraining effect of the rebars on the ECC matrix,and then better utilize the high ductility of the ECC joint plate.
NETL
NSTL
万方数据
维普
