某三层无筋砌体房屋(无吊车)，现浇钢筋混凝土楼(屋)盖，刚性方案，砌体采用 MU10级蒸压灰砂砖、M7.5级水泥砂浆砌筑，施工质量控制等级为B级，安全等级二级。各层砖柱截面均为370mm×490mm，基础埋置较深且底层地面设置刚性地坪，房屋局部剖面示意如题图所示。
当计算底层砖柱的轴心受压承载力时，试问，其φ值应与下列（）项数值最为接近。
A．0.91
B．0.88
C．0.83
D．0.78
参考答案：D
解析：
根据《砌规》5.1.2和5.1.3条，
Ho=H+500=3300+300+500=4100mm；h=370mm；γβ=1.2
β=1.2×4100/370=13.3；
查附表D得：φ=0.78。
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