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引言钢桁梁的压杆,为了增加刚度尽量避免过大的纵向挠曲折减起见,需要将材料分向横截面中的外廊部位,以增大I_x和I_y值。最理想的形状是封闭的管状。但是为了在杆件制造和工地安装的方便起见,常需采取一面或二面开口的形式。怎样保证开口薄壁杆件受力良好,在桥规中有以下规定: §167主桁压杆的开口面上,除各肢宽度不超过其厚度30倍的杆件及H形截面的杆件外,应有缀条或缀钣……§154……桁梁杆件的横截面组成中受压的单钣或钣束的各部分尺寸间的比例,应符合表十七和表十八的
INTRODUCTION In order to increase the rigidity and avoid the excessive longitudinal deflection reduction, it is necessary to divide the material into the outer corridor section in the cross section so as to increase the I_x and I_y values. The ideal shape is a closed tube. However, it is often necessary to take the form of one-sided or two-sided opening for the convenience of rod manufacturing and site installation. How to ensure the opening of thin-walled rod under the force, in the bridge rules are as follows: § 167 main trussed pole bar opening surface, in addition to limb width of not more than 30 times the thickness of the rod and H-section rod , There shall be a strip or panel ... § 154 ... The proportions of the dimensions of the individual sections of the sheet or bundle of sheets subjected to compression in the cross-sectional composition of the girder section shall be in accordance with Table XVII and Table XVIII