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有一毛石混凝土重力式挡土墙，如题图所示，墙高为5.5m，墙顶宽度为1.2m，墙底宽度为2.7m。墙后填土表面水平并与墙齐高，填土的干密度为1.90t/m3。墙背粗糙，排水良好，土对墙背的摩擦角δ=10°。已知主动土压力系数ka=0.2；挡土墙埋置深度为0.5m，土对挡土墙基底的摩擦系数P=0.45。 假定填土表面有连续均布荷载q=20kPa作用，试问，由均布荷载作用产生的主动土压力Eaq最接近于下列（）项数值。
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某三跨钢筋混凝土框架结构高层建筑，抗震等级为二级，边跨跨度为5.7m，框架梁截面b×h=250mm×600mm，柱截面为500mm×500mm，纵筋采用HRB400级、箍筋采用HPB300级钢筋(fyv=270N/mm2)，用C30混凝土。重力荷载代表值作用下，按简支梁分析的边跨梁梁端截面剪力设计值VGb=130.4kN。在重力荷载和地震作用的基本组合下作用于边跨一层梁上的弯矩值为：梁左端：Mmax=200kN·m，-Mmax=-440kN·m梁右端：Mmax=175kN·m，-Mmax=-360kN·m梁跨中：Mmax=180kN·m边跨梁：V=230kN取as=as'=35mm. 该边跨梁跨中截面下部纵向钢筋截面面积As（mm2），与下列何项数值最为接近（）提示：不考虑跨中截面上部纵向钢筋，按单筋梁计算。
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