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单选题 力法典型方程中的自由项是( )
学科：结构力学
时间：2024-06-20 13:54:21
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题目1单选题
如图所示超静定结构,选择图示力法基本体系,力法方程中的自由项<img src="https://tihai-oss-cloud.itihey.com/img/d81fd547ecbbcf828765140fdaf37836.png">等于( ).<img src="https://tihai-oss-cloud.itihey.com/img/d024ca0c5d4627825641108e4ae1ff3b.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/58841f98f9e1790e40a64f77d7d5ee72.png">l<img src="https://tihai-oss-cloud.itihey.com/img/1aa667a850576a9cd4aa7e5abd8ab51a.png">B. -l<img src="https://tihai-oss-cloud.itihey.com/img/1aa667a850576a9cd4aa7e5abd8ab51a.png">C. 2l<img src="https://tihai-oss-cloud.itihey.com/img/1aa667a850576a9cd4aa7e5abd8ab51a.png">D. l<img src="https://tihai-oss-cloud.itihey.com/img/1aa667a850576a9cd4aa7e5abd8ab51a.png">
题目2单选题
图示排架,CD柱的柱端弯矩MCD的值为( ).<img src="https://tihai-oss-cloud.itihey.com/img/fbdbd39a58365b0b08389b17ebce0e89.png">A. FlB. <img src="https://tihai-oss-cloud.itihey.com/img/f449b693f8962811160a82b6e65c3a48.png">FlC. <img src="https://tihai-oss-cloud.itihey.com/img/cb367781f3fcbaf3898f1108ad5e93a3.png">FlD. <img src="https://tihai-oss-cloud.itihey.com/img/bd73d307d2ea4224154b9c90edd0b7cc.png">Fl
题目3单选题
图示单跨梁,AC=BC,支座弯矩绝对值之比|MA|:|MB|=( ).<img src="https://tihai-oss-cloud.itihey.com/img/08b05b4e4d2476107a20d0c1df771c49.png">A. 3:5B. 9:3C. 3:7D. 9:1
题目4单选题
图示结构,截面C的( ).<img src="https://tihai-oss-cloud.itihey.com/img/18b37a0e8b01cb7d37e62dbf47c19508.png">A. 轴力等于零B. 内力均不为零C. 剪力等于零D. 弯矩等于零
题目5单选题
已知图示结构D点的挠度为<img src="https://tihai-oss-cloud.itihey.com/img/096a3f08264699ef273971bc722013a6.png">D,当BC杆刚度增大为2EI2时,D点的挠度为( ).<img src="https://tihai-oss-cloud.itihey.com/img/7243505bafbba5cc32d4fc3fbd4000c9.png">A. <img src="https://tihai-oss-cloud.itihey.com/img/096a3f08264699ef273971bc722013a6.png">DB. 0.5<img src="https://tihai-oss-cloud.itihey.com/img/096a3f08264699ef273971bc722013a6.png">DC. 1.5<img src="https://tihai-oss-cloud.itihey.com/img/096a3f08264699ef273971bc722013a6.png">DD. 2<img src="https://tihai-oss-cloud.itihey.com/img/096a3f08264699ef273971bc722013a6.png">D
题目6单选题
力法的基本方程中,自由项的值为( )A. 负值B. 零C. 正值D. 可能为正值、负值或零
题目7单选题
图示结构的超静定次数是( ).<img src="https://tihai-oss-cloud.itihey.com/img/bacd0d32aca2d0ff8bec1cd20b882e0b.png">A. 7B. 8C. 10D. 9
题目8单选题
力法的基本未知量( )A. 结点位移B. 多余未知力C. 结点角位移D. 结点线位移
题目9单选题
图示超静定结构,材料线性膨胀系数为0.01℃-1,抗弯刚度EI为常数,截面为矩形,杆件截面高度为h=300mm,截面积A=<img src="https://tihai-oss-cloud.itihey.com/img/afaa7d361b7bef1021c5cad68e64caf1.png">,在温度变化作用下,A点弯矩为( ).<img src="https://tihai-oss-cloud.itihey.com/img/08e413286daf924af229a18ede21bc7d.png">A. 0.12EI(下侧受拉)B. -0.12EI(上侧受拉)C. -0.003EI(上侧受拉)D. 0.003EI(下侧受拉)
题目10单选题
力法典型方程中的自由项是( )A. 单位荷载引起的位移B. 荷载引起的杆端力C. 单位荷载引起的杆端力D. 荷载引起的位移
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