輕鋼（冷彎薄壁型鋼）結構與普通鋼結構構件設計的主要差別是在受壓構件或板件中，引進了有效截面的概念。設計輕鋼受壓構件時，當板件寬厚比超過一定數值。

The main difference between light steel (cold-formed thin-walled steel) structure and ordinary steel structure is that the concept of effective section is introduced into compression member or plate. In the design of light steel compression members, when the width thickness ratio of the plate exceeds a certain value.

其軸心受壓構件的承載強度即應采取桿件的有效凈截面計算，穩定性計算采用桿件毛截面所確定的穩定系數及有效截面計算；受彎（拉彎、壓彎）構件的強度計算應根據毛截面確定桿件各板件屬于受拉和受壓范圍，從而確定受壓板件有效截面后再進行強度驗算，穩定計算中的穩定系數由構件毛截面計算而得，受彎構件的變形應按毛截面計算。

The bearing strength of the axial compression member should be calculated by the effective net section of the member, and the stability calculation should be calculated by the stability coefficient and effective section determined by the gross section of the member; the strength calculation of the bending (tension bending, compression bending) member should be based on the gross section to determine the tension and compression range of each plate of the member, so as to determine the effective section of the compression plate, and then carry out the strength checking calculation to ensure the stability The stability coefficient in the fixed calculation is obtained from the gross section of the member, and the deformation of the flexural member should be calculated according to the gross section.

輕鋼構件的寬厚比應根據板材支撐情況及應力狀態確定。計算寬厚比時，板材寬度應從截面邊緣（包括彎角部分在內）算起。

The width thickness ratio of light steel members should be determined according to the plate support and stress state. When calculating the width thickness ratio, the width of the plate should be calculated from the edge of the section (including the corner part).

在一些情況下，截面為全截面有效，譬如：圓管截面外徑與壁厚比，當采用Q235時不大于100，對于Q345時，不大于68。

In some cases, the section is full section effective, for example, the ratio of outer diameter to wall thickness of round pipe section is not greater than 100 when Q235 is used, and not greater than 68 when Q345 is used.

確定板件卷邊尺寸時，應符合一些要求，譬如卷邊的大高厚比不宜大于12等。

Some requirements should be met when determining the hemming size, such as the maximum height thickness ratio of hemming should not be greater than 12.