日本欧美一区二区三区不卡视频_亚洲欧美日韩中文字幕一区二区_日韩免费视频一区二区_欧美黑人粗大猛烈18p

Steel house seismic level is how much?

Guangzhou Steel tells you: Steel house seismic level is how much?
   1, the height near or equal to the height of the boundary should be allowed to bind irregularity of the house and grounds, ground conditions to determine the seismic level;
   2, in general, seismic level member of the structure should be the same; when the bearing capacity of a certain part of each member of the internal forces are to meet the requirements of 2 times the seismic effect combinations, and 7 to 9 degrees by members should be allowed to reduce seismic rating was OK . Guangzhou Steel