试题与答案

30~32 如题30~32图所示,某窗间墙长1500mm,墙厚为370mm;中部支承

题型:单项选择题

题目:

30~32 如题30~32图所示,某窗间墙长1500mm,墙厚为370mm;中部支承钢筋混凝土梁的截面尺寸hc×b=550mm×250mm,梁端实际支承长度为240mm,上层墙体传来轴向力设计值 Nu=150kN,梁端支承反力设计值N1=100kN。

当窗间墙采用MU10烧结黏土砖、M5水泥砂浆砌筑时,梁端下砌体的局部受压承载力计算式(ψN0+N1≤ηγfA1)与下列()项相接近.

A.100kN>95.7kN

B.100kN>89.4kN

C.250kN>95.7kN

D.250kN>89.4kN

答案:

参考答案:B

解析:

(1)由MU10,M5查《砌体规范》表3.2.1-1得f=1.5N/mm2,由于采用水泥砂浆,取γa=0.9。

f=1.5×0.9=1.35(N/mm2)

(2)计算梁端有效支承长度。

(3)计算A0、A1

A0=(2×370+250)×370=366 300(mm2)

A1=201.8×250=50 450(mm2)

(4)计算砌体局部抗压提高系数了。

(5)计算梁端下砌体局部受压承载。

取ψ=0

ΨN0+n1=0+100=100(kN)

ηγfA1=0.7×1.786×1.35×50450=89.4(kN)

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