问答题

桁架结构是由若干（）在其两端用（）连接而成的（）结构体系，主要由（）、（）和（）三部分组成，腹杆有（）和（）之分。

【参考答案】

(1)
直杆 (2)
铰 (3)
格构式 (4)
上弦杆 (5)
下弦杆 (6)
腹杆 (7)
斜腹杆 (8)
竖腹杆

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