在人们认识了实腹式梁的受力特征后，逐步将其部分腹部材料掏空，形成了平面桁架梁。

Having known the characters of the solid abdomen beam, people begin to remove some material in abdomen of the beam, thus the plane truss beam is formed.

youdao

在人们认识了实腹式梁的受力特征后，逐步将其部分腹部材料掏空，形成了平面桁架梁。

Having known the characters of the solid abdomen beam, people begin to remove some material in abdomen of the beam, thus the plane truss beam is formed.

youdao