SHAKE TABLE TESTS OF SEGMENTAL BRIDGE COLUMNS WITH MATCH-CAST DRY JOINTS
SHAKE TABLE TESTS OF SEGMENTAL BRIDGE COLUMNS WITH MATCH-CAST DRY JOINTS
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发表时间：
2011
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通讯作者：
W. Zhiqiang
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作者：
W. Zhiqiang
为研究预制节段桥柱的抗震性能，设计了5根混凝土桥柱的试验；其中3根为预制节段桥柱，2根为现浇节段桥柱。通过相同峰值重力加速度(PGA)作用下的振动台试验，研究了5根混凝土桥柱的动力特性、破坏过程、节点张开和位移响应等抗震性能。结果表明，3根预制节段桥柱在塑性铰区节点处出现明显的弯曲裂缝，而节段柱体未出现裂缝。随着激励强度的增加，节段桥柱的受力性能得到改善。预制节段桥柱的位移响应比常规现浇钢筋混凝土桥柱的位移响应大，耗能筋的存在增加了节点的刚度，减缓了位移反应，延缓了节点的张开，耗散了更多的能量；对于预制节段桥柱，由于预应力束在大震作用下的屈服，导致位移响应显著增加。
To investigate the seismic performance of precast segmental bridge columns,an experiment including five concrete bridge columns was designed;among them three were precast segmental bridge columns and the other two were cast-in-place bridge columns.Through the shake table test under the same peak gravity acceleration(PGA),the seismic behaviors of the five concrete bridge columns were demonstrated including the dynamic properties,the damage process,the opening of the joints and the displacement response.Results showed that,for the three precast segmental bridge columns,significant flexural cracking occured at the joints in the plastic hinge zones while no cracks were observed in the body of segmental column.With the increasing of the excitation,the opening of the joints became larger showing the swaying phenomenon.The displacement response of the precast segmental bridge column was larger than that of the conventional cast-in-place reinforced concrete bridge column.The existing of energy-dissipating bars increased the stiffness,mitigated the displacement response,delayed the opening of joints and dissipated more energy.For the precast segmental bridge column with the bonded prestressing strands,the displacement response increased significantly due to the yielding of prestressing strands under large earthquakes.