發(fā)布時間：2019-05-08 21:51

【摘要】：為評價采用預應力筋進行鋼筋混凝土橋墩地震損傷控制的有效性,設計6個豎向配置無粘結預應力筋和1個無預應力筋的鋼筋混凝土橋墩試件,并分別進行了固定軸力下的擬靜力加載試驗。詳細對比各試件的抗震性能并重點關注試件混凝土開裂和殘余位移等地震損傷情況。結果表明,在橋墩試件中配置豎向預應力筋可有效減少其裂縫寬度和殘余位移,提高試件的承載力和抗彎剛度,但在一定程度上降低了試件的耗能能力;確保預應力筋不拉斷或松弛是橋墩地震損傷控制設計的關鍵;增加預應力筋初始應力,可減少橋墩的裂縫寬度,減少試件的延性和耗能能力,但對試件的殘余位移和剛度退化影響不明顯;改變預應力筋的位置對橋墩裂縫寬度、殘余位移、延性及耗能能力、剛度退化等均未產生明顯影響。
[Abstract]:In order to evaluate the effectiveness of using prestressed tendons to control seismic damage of reinforced concrete piers, six specimens of reinforced concrete piers equipped vertically with unbonded prestressed tendons and one reinforced concrete pier without prestressed tendons were designed. The quasi-static loading tests under fixed axial force are carried out respectively. The seismic performance of each specimen is compared in detail, and emphasis is paid to the seismic damage such as concrete cracking and residual displacement. The results show that the vertical prestressed tendons can effectively reduce the crack width and residual displacement, improve the bearing capacity and flexural stiffness of the specimens, but to a certain extent, reduce the energy dissipation capacity of the specimens. Ensuring that the prestressed tendons do not break or relax is the key to the seismic damage control design of piers. Increasing the initial stress of prestressed tendons can reduce the crack width of pier, reduce the toughness and energy dissipation capacity of specimens, but has no obvious effect on the degradation of residual displacement and stiffness of specimens. Changing the position of prestress tendons has no obvious effect on the crack width, residual displacement, ductility, energy dissipation capacity and stiffness degradation of piers.
【作者單位】： 大連海事大學;遼寧省公路工程重點實驗室;大連理工大學;
【基金】：國家重點基礎研究發(fā)展計劃(973項目)(2011CB013605) 國家自然科學基金(51008041) 中央高�；究蒲袠I(yè)務費(3132013068,3132013315) 教育部新世紀優(yōu)秀人才支持計劃(NCET-12-0751)
【分類號】：U443.22

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相關期刊論文 前4條

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