图示桁架有几根零杆（）https://assets.asklib.com/images/image2/2018072215540018970.jpg
不经计算，通过直接判定得知图示桁架中零杆的数目为：（）https://assets.asklib.com/psource/2016071915432440977.jpg
图示桁架中杆件内力等于零，即所谓“零杆”为（）。https://assets.asklib.com/images/image2/2017032912010929443.jpg
图示桁架中的零杆数为（）。https://assets.asklib.com/images/image2/2017040815313462928.png
不经计算，通过直接判定得知图示桁架中零杆的数目为：（）https://assets.asklib.com/psource/2015102711590765182.jpg
不经计算，通过直接判定得知图示桁架中零杆的数目为：（）https://assets.asklib.com/psource/2015110409034683288.png
不经计算，通过直接判定得知图示桁架中零杆的数目为：（）https://assets.asklib.com/psource/2015102711584262476.jpg
桁架中把内力为零的杆件称为零杆。图示桁架中，零杆为 。c5e392f55396277096153584af6f370c.png
图示桁架，各杆EA为常数，除支座链杆外，零杆数为：138ec65c5d81401594edfb698b3183c2.png
试判断图示平面静定桁架零杆，将受力为零的杆在杆上画○便可。
图示平面桁架的尺寸与荷载均已知。其中，杆l的内力Fsl为：<img src='https://img2.soutiyun.com/ask/uploadfile/2685001-2688000/2b5e698550363f774697a9fa6e41f2ce.jpg' /><img src='https://img2.soutiyun.com/ask/uploadfile/2685001-2688000/ca1cf786701d144c3b3d40846dd03503.jpg' />
图所示桁架，杆①的轴力为()。<img src='https://img2.soutiyun.com/shangxueba/ask/2013001-2016000/2014868/ct_jgzjgyxm_jgzjgyxchoose_00413(20093).jpg' />
图示桁架,零杆的数目为:()。<img src='https://img2.soutiyun.com/shangxueba/ask/2021-11/18/610/20211118110717736.png' />
下图所示为一个桁架，各杆EA为常量，结点D的竖向位移△<sub>DV</sub>为：<img src='https://img2.soutiyun.com/ask/2020-03-10/952707807279025.png' />
不经计算，通过直接判定得知图示桁架中零杆的数目为： A．4根 B．5根 C．6根 D．7根<img src='https://img2.soutiyun.com/ask/uploadfile/2685001-2688000/4821fc816d739b88dcc00352e3aaf998.jpg' />
图示结构中，桁架杆件的零杆个数为()。<img src='https://img2.soutiyun.com/shangxueba/ask/2013001-2016000/2014858/ct_jgzjgyxm_jgzjgyxchoose_00403(20093).jpg' />
图示桁架中AC为刚性杆，则杆件内力将为：<img src='https://img2.soutiyun.com/ask/uploadfile/2751001-2754000/9fb5acb1eb81f69b612451f4827d360f.jpg' /><img src='https://img2.soutiyun.com/ask/uploadfile/2751001-2754000/9f14324753c3c2232abed5a8d631191e.jpg' /><img src='https://img2.soutiyun.com/ask/uploadfile/2751001-2754000/b79697a31e8434195d3b04508ed6b3a6.jpg' /><img src='https://img2.soutiyun.com/ask/uploadfile/2751001-2754000/7436312b917fbdf46302607deb64a08c.jpg' /><img src='https://img2.soutiyun.com/ask/uploadfile/2751001-2754000/97ab12a006f8e48778936d2e5c058d3a.jpg' />
图a）所示桁架，EA=常数，取图b）为力法基本体系，则力法方程系数间的关系为：（）<img src='https://img2.soutiyun.com/shangxueba/ask/18738001-18741000/18740656/2016071809254342901.jpg' />
如图15-2-24所示的桁架,零杆数目为()。<img src='https://img2.soutiyun.com/1/2021-04-08/98674972280194.png' />
右图所示桁架中的零杆为()<img src='https://img.soutiyun.com/ask/zq/20210712/994933131752787.png' />
图示桁架B点竖向位移（向下为正）△<img src='https://img2.soutiyun.com/shangxueba/ask/17727001-17730000/17727028/2015102815202050082.jpg' />为：（）<img src='https://img2.soutiyun.com/shangxueba/ask/17727001-17730000/17727028/2015102815201840985.jpg' />
图示桁架中零杆的数目为(不包括支座链杆)()。<img src='https://img2.soutiyun.com/shangxueba/ask/2021-11/18/1306/20211118110617563.png' />
如图15-2-13所示,桁架a杆的内力是()。<img src='https://img2.soutiyun.com/1/2021-04-08/986749751068919.png' />
桁架中把内力为零的杆件称为零杆。图示桁架中,零杆为()。<img src='https://img2.soutiyun.com/shangxueba/ask/2021-09/30/891/20210930110441405.png' />
