【单选题】支承屋面梁的柱牛腿,如下图所示,宽度b=400mm,屋架在牛腿上的支承长度为200mm,竖向力作用点到下柱边缘的水平距离a=300mm(已考虑安装偏差20mm),外边缘高h 1 =h/3(h为牛腿高度),牛腿底面倾斜角α=45°。作用在牛腿顶部按荷载效应标准组合计算的竖向力F vk =450kN,竖向力的设计值F v =580kN,同时作用在牛腿顶部按荷载效应标准组合计算的水平拉力F hk =12...
【单选题】The 18th century was an age of poetry. A group of excellent poetry writers, such as Jonathan Swift, Samuel Richardson, Henry Fielding, were produced.