预应力混凝土梁自振频率的疲劳演变
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杜永潇,卫军,孙晓立
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Fatigue evolution of natural frequency for prestressed concrete beam
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Yong-xiao DU,Jun WEI,Xiao-li SUN
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| 表 1 模型梁的试验参数设置 |
| Tab.1 Test parameters setting of model beams |
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| 梁编号 | σcon/MPa | Npt/kN | E/MPa | 试验种类 | Pmin/kN | Pmax/kN | ΔP/kN | Pu/kN | Nf /104 | | PCB-MPD-SL-1 | 0.70fptk | 250.21 | 33 475 | 静载试验 | — | — | — | 241.8 | — | | PCB-MPD-CFL-1 | 0.70fptk | 250.21 | 34 143 | 等幅疲劳试验 | 40 | 82 | 42 | — | 248.3 | | PCB-MPD-CFL-2 | 0.70fptk | 250.21 | 33 408 | 等幅疲劳试验 | 40 | 90 | 50 | — | 160.1 | | PCB-LPD-SL-1 | 0.60fptk | 207.44 | 32 594 | 静载试验 | — | — | — | 234.6 | — | | PCB-LPD-CFL-1 | 0.60fptk | 207.44 | 31 673 | 等幅疲劳试验 | 40 | 92 | 52 | — | 63.2 |
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