A.The room is on fire.B.The man is bothered by the smoke.C.There is little air.D.The ma
A. The room is on fire.
B. The man is bothered by the smoke.
C. There is little air.
D. The man is not permitted in the room.
有一高100m、高宽比为2.5的高层建筑,位于大城市郊区,已知基本风压ω0=0.50kN/m2,结构基本自振周期T=2000s,通过简单计算确定,在高度80m处的风振系数βz值应为______ 项数值。
A. 1.62
B. 1.44
C. 1.3
D. 1.05
已知钢筋混凝土过梁净跨ιn=3.0m,过梁上砌体高度1.2m,墙厚190mm,墙体采用 MU7.5砌块、Mb5混合砂浆砌筑,承受楼板传来的均布荷载设计值15kN/m。过梁伸入墙内200mm,砌块厚度为190mm,双面抹20mm混合砂浆,单位面积容重为3.38kN/m2(如图所示)。
与该过梁下砌体局部承压力最接近的是______ 项数值。
A. 29.1kN
B. 30.5kN
C. 40.2kN
D. 35.3kN
【B2】
A. must
B. should
C. can
D. would