A.0.5L B.0.25L C.0.35L D.0.29L(L為桿件長(zhǎng))
A.0.4mm B.0.6mm C.1mm D.1~2mm
A.構(gòu)件自重小 B.荷載增加時(shí)不產(chǎn)生裂縫 C.施工工序簡(jiǎn)單 D.節(jié)省材料