輕鋼（冷彎薄壁型鋼）結(jié)構(gòu)與普通鋼結(jié)構(gòu)構(gòu)件設(shè)計(jì)的主要差別是在受壓構(gòu)件或板件中，引進(jìn)了有效截面的概念。設(shè)計(jì)輕鋼受壓構(gòu)件時(shí)，當(dāng)板件寬厚比超過一定數(shù)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(gòu)件的承載強(qiáng)度即應(yīng)采取桿件的有效凈截面計(jì)算，穩(wěn)定性計(jì)算采用桿件毛截面所確定的穩(wěn)定系數(shù)及有效截面計(jì)算；受彎（拉彎、壓彎）構(gòu)件的強(qiáng)度計(jì)算應(yīng)根據(jù)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(jìn)行強(qiáng)度驗(yàn)算，穩(wěn)定計(jì)算中的穩(wěn)定系數(shù)由構(gòu)件毛截面計(jì)算而得，受彎構(gòu)件的變形應(yīng)按毛截面計(jì)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(gòu)件的寬厚比應(yīng)根據(jù)板材支撐情況及應(yīng)力狀態(tài)確定。計(jì)算寬厚比時(shí)，板材寬度應(yīng)從截面邊緣（包括彎角部分在內(nèi)）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(dāng)采用Q235時(shí)不大于100，對(duì)于Q345時(shí)，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(shí)，應(yīng)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.