解： 选取位移法基本体系如习题解答图 8-11（a）所示。根据结点 [tex=0.786x1.0]I/kNMtd8YcgkWCrgriW/hA==[/tex]处附加刚臂中约束力矩等于零及附加链杆中约束力等于零的静力平衡条件，写出位移法方程[tex=12.0x2.786]thMFOI0/VnVsJT08kMg9k94BOt4WeRkTT0CX/NwizBN0Yoc8CBqxQEJBQbPGQezNg+fFROBlNv1nqIFKd52cr0HXz+1Cd26awiPGWxEZFCJSN0jJ5aFZK0n2jfO/gtJbXWSDQcERbEdJ3pPl9F82BzN8pALM06tdsEsdBRo5g+4=[/tex]为了计算位移法方程中的刚度系数和自由项, 分别绘出单位弯矩图和荷载作用下的弯矩图, 如习题解答图 [tex=8.143x1.286]T8AD0XHuyZuf1izKPISFLzOXHdsaf6VVyDa+jgvKT0PJ1ykX3KWj5nhpm+pyvWjL[/tex]所示。[img=644x589]17a65e823b0775c.png[/img][tex=30.0x2.429]f5qKXpf6byWT80xqYdbbTQyN/b80nXiGDPf2vdlHGaElNMnOvIYbvPEu/ZUq++BzChFI4BMcp8cCBgy6n6kBsVMWwq5vqXvxzf4SLxfiaHwXNRWMm4X8H0eYNphzP95sBd1inNuYh/OGL3EKqIkDoEGwUgMFLw96k0A4SFZSKV7jjFy0R6F2zJjYcH+zVPCc0QwXZauJr5Z/GiC/5o48ZfKxFHvYITVlteqEbIMAUPo=[/tex][tex=26.571x2.429]Z3XlzUR3irEtnpyyT7msD+aUAiTJutG2EyzWQ5+5ktF73tWM6iVxzRJNrgF/HKHY8NnqUll2CHf5lP00cRPuMuQ6qriNUpFGhgjR+bHGf7BnnynzkX6hK3Bl4jy5dy4ZJXm8uxWdJH8rrg4m839e/6tnXQxIRtJOXDJs1SeuM8c20LGTRWf7omz6RZrvXRda[/tex]将求得的刚度系数和自由项代入位移法方程[tex=15.071x5.214]IfEG3NsBfGhtbCalasoF/+RAxycgCFvHjkU9Mh5JPBpD4wJ9DNzB6cnWN2rHw2mHpgaQNOciMPdDDKvE5a9ysfUTI8s05VqOY8yQUpP49d6F1bx4e4EZ9QBR2e//1cf0Ax4ywum0sQ0CZ5pRC3jfOh57/Jml1pMybJUgfT9fe/S2NldrFs6Vfi8Fv9BqugtlmU+Tzb+20wHzKRUB/Lr129ZdHvcl/ZKnZ7/A0DQPwcM=[/tex]解方程，得[tex=7.214x5.5]IfEG3NsBfGhtbCalasoF/44kyLyQDdBE36XFV8raJP/DUAkJ0H/HOztoCutj4ONXfSD3N5XdHaYvJPH7qtPOmuYlbuTTkKlXdjazTuAUWtlvMOiq25Mkv3ACWh6szFd1he/MKJcSgt4AuV7UmO5BIQ==[/tex]按式 [tex=9.429x1.357]jILah2cHpe8RVf0EOgsJD6FDoJNNgxVNdQ8J1ro2qrwFwzMDodpuanRRRXx5MAiV[/tex]绘出刚架的弯矩图如习题解答图[tex=3.5x1.357]cZfuHDen8QKKQna6P9xjrUSrPiuiad9WflbbOtJ6SIw=[/tex]所示。