多跨静定梁如图13-3a所示，应用虚位移原理，求支座B处的约束力。[img=503x362]17db21c66821c8f.png[/img]

2022-05-30

多跨静定梁如图13-3a所示，应用虚位移原理，求支座B处的约束力。[img=503x362]17db21c66821c8f.png[/img]

答案：

将支座B处的约束解除，代入相应的约束力[tex=1.286x1.286]4Dw2s7ML7bHkJVixFk1QkQ==[/tex]，并发生虚位移。如图13-3b所示，根据虚位移原理（几何法）：[tex=5.429x1.357]n1CIl4UXm2GzzFiEyRrGdHJWPrqgd2Ve5Sb0be9IY8Q=[/tex]，[tex=16.0x1.286]IOTGO89XyWg/Rm+dsfG1vJpG09M6SFm0FBq3jUTQz7+LHWdczeYBgdm+SU036KHEBbMRU7GRroMDxBXI5dAMcLGf0WjTvdbMegkbeXFCwNzcrZzaEC1B3ezSynsFMbma[/tex][tex=13.5x2.214]m7CJ06Fk1R63uxLuGe0g782gO0Sop9Q65lxPRyaJOW121Ko6G9OjUgIbmL9obXmYdDJ5lM8N+LMBmR5JXAFNg3E54jgy/LywtC3VfaLGTeWgN6hEAj8KBAKmE2N8WXttppZzpnbe9IPao4OywotImEBMnuc46LMy4q3VcEoO/Lw6jseUI++H419k1m/vdvh8[/tex]由虚位移几何关系（几何法）[tex=9.071x2.214]herrN99z+xN1M5SYCZDvJtu4AlAEZijPIbDiErFdlVm3oobs77t+HzZ0DkJFMw7AXeVsupJ99Nhl7ebSs/6y185K8s04jSyq2AjH7yMCvnBb2BWG1rAWeOdsUt3yGZro/Z+JSx91e463EtaIymFKTQ==[/tex][tex=25.929x2.214]U2Q9d9b254cPc4j/CH/1CIsUCTqlGhXrmxhL9Noe7JGjvbJ8IwGiDTzjqzSrRfchnlL6dHrsmrt42iTPhEiF+h24pa6SPUIImrcLHeKSIZfZO2p+047+kmXCJjPxuqyem5HnxLmhVQ+gAg3cTUHiwumdVst1OHQb9lBSvLWBuhgDAtGc12Mnf1fYnruqRIjrXnivgwrcgz74RA1uEJwBiQmFh5+y8jStnA5uce5EElycwvLWgqgd1Nw2oIlAbzBepNLkYbamtNZ4qlETdI7ps0VRUMB6zBkPuWMIYclqoyXAVHQxv+QzZdXRQzXo1fmu//siYZPUoVzHhtLuQ2dAiw==[/tex]代入解得[tex=4.071x1.286]XCqmhVTUszoW7s86R0Y3BX9Y2wB+MY45o2DiEXQ3T6xCUrTnw+sFdPNwWfT8sUtt[/tex][tex=11.286x2.0]RhzPkbZMfxpAwPxb1NrHPgJYL+Sr6DqOfrkxQLwBFaYbPmU3/xYRbdGhW1UNTJmBZ09pBwmo2gAFHE0tWIXRLQ==[/tex]

举一反三

内容

0
图a所示超静定梁承受支座位移的作用，其力法基本体系如图b所示，则力法方程为（）。[img=559x204]180379cef1f1875.jpg[/img] A: [img=124x22]180379cefabf3d4.png[/img] B: [img=144x22]180379cf0488458.png[/img] C: [img=81x22]180379cf0db0ecb.png[/img] D: [img=130x22]180379cf1701a21.png[/img]
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图a所示超静定梁承受支座位移的作用，其力法基本体系如图b所示，则力法方程为（）。[img=559x204]1802df4e0d24f79.jpg[/img] A: [img=124x22]1802df4e156b3ac.png[/img] B: [img=144x22]1802df4e1de7632.png[/img] C: [img=81x22]1802df4e26712bf.png[/img] D: [img=130x22]1802df4e2ebcb2a.png[/img]
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图a所示超静定梁承受支座位移的作用，其力法基本体系如图b所示，则力法方程为（）。[img=559x204]1803858c58cb648.jpg[/img] A: [img=124x22]1803858c618dcf8.png[/img] B: [img=144x22]1803858c6a1c355.png[/img] C: [img=81x22]1803858c727ae1f.png[/img] D: [img=130x22]1803858c7b1fd34.png[/img]
3
图a所示超静定梁承受支座位移的作用，其力法基本体系如图b所示，则力法方程为（）。[img=559x204]180379b6ebd8d10.jpg[/img] A: [img=124x22]180379b6f567486.png[/img] B: [img=144x22]180379b6fe85d77.png[/img] C: [img=81x22]180379b706d0e1a.png[/img] D: [img=130x22]180379b7106a2f9.png[/img]
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图a所示超静定梁承受支座位移的作用，其力法基本体系如图b所示，则力法方程为（）。[img=559x204]180352049635b20.jpg[/img] A: [img=124x22]180352049fcdee2.png[/img] B: [img=144x22]18035204a94ea7c.png[/img] C: [img=81x22]18035204b1ac11b.png[/img] D: [img=130x22]18035204b9c7177.png[/img]