A.0.2%
B.0.6%
C.0.4%
D.0.8%
A.0.2%
B.0.6%
C.0.4%
D.0.8%
A.0.1%
B.0.3%
C.0.5%
D.1%
A.0.15%
B.0.20%
C.0.25%
D.0.30%
A.提高结构刚度
B.防止开裂
C.确保结构稳定性
D.增加构件尺寸
A.160mm2
B.180mm2
C.200mm2
D.220mm2
A.0.1%
B.0.2%
C.0.3%
D.0.4%
A.0.3≤ζ≤0.8
B.0.6≤ζ≤1.7
C.1.0≤ζ≤2.0
D.1.5≤ζ≤2.5
A.0.1%
B.0.2%
C.0.3%
D.0.4%
A.0.5≤ζ≤1.5
B.0.7≤ζ≤1.8
C.0.6≤ζ≤1.7
D.0.5≤ζ≤1.6