四连跨干煤棚压型金属板屋面系统抗风揭设计

设计采用当地百年一遇基本风压0.8 k Pa,通过风洞试验测得四连跨干煤棚屋面围护结构两端开口处边缘、角部分区及其他分区最大风吸力标准值分别为-6,-3.5 k Pa。介绍压型金属板屋面系统的压型钢板选型,自钻螺钉、檩条及连接节点设计,以及屋面系统的防台风构造措施。结果表明:整个屋面系统的抗风揭能力满足设计要求。屋面系统的实际抗风揭能力还应通过抗风揭试验验证。

Experimental study of wind loads on cylindrical reticulated shells

The cylindrical reticulated shell structures without side walls, which are normally arranged in pairs, are usually used as dry-coal sheds in a thermal power plant. The wind loads of these shells do not exist in standards or codes. Therefore, this study investigates the mean and fluctuating wind loads on a cylindrical reticulated shell with a rise-to-span ratio of 0.39 through a series of wind tunnel tests. The characteristics of the wind pressures on the upper and lower surfaces and the net pressures are presented. The results show that the wind direction and another shell structure significantly affect the wind loads on the principal shell. The most unfavorable wind direction is around 30~, whereas the effects of the wind field and the height of the coal stack are small. The surfaces of the shells are divided into nine blocks, and the block mean and fluctuating （rms） pressure coefficients suitable for engineering applications are given as references for wind load codes.

四连跨干煤棚三心圆柱面网壳结构设计与研究

介绍四个105m连跨干煤棚三心圆柱面网壳结构设计,指出网壳支座设在24.10m高的柱顶比设在地面能大大提高土地使用效率。编制MSTCAD与MIDAS软件的数据转换程序,将MSTCAD的单跨网壳计算模型转换到MIDAS中,与下部支承梁、柱建立四连跨干煤棚整体空间计算模型。通过比较MIDAS与MSTCAD的计算结果,证明该设计方法的可行性与准确性,为类似多个连跨空间网格结构工程的整体空间计算与设计提供了新的解决方案。