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自由的“蝴蝶”
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作者 张三黎 夏玉桥(指导) 《东方少年(阅读与作文)》 2017年第7期36-36,共1页
我十四岁那年,脾气变得十分暴躁。对于老师和父母的话,我一句都听不进去。无奈,只好打起包袱回家,休学一年。回到家,父亲并没有斥责我,只是对着半途而废的我深深地叹了口气。'我渴望自由,不愿受学校的种种限制。'我丢下这句话... 我十四岁那年,脾气变得十分暴躁。对于老师和父母的话,我一句都听不进去。无奈,只好打起包袱回家,休学一年。回到家,父亲并没有斥责我,只是对着半途而废的我深深地叹了口气。'我渴望自由,不愿受学校的种种限制。'我丢下这句话。这几天,父亲一直在柴房中砍砍剁剁。一天,父亲对无聊至极的我说:'孩子,你不是一直在找自由的感觉吗?走,跟爸去。' 展开更多
关键词 自由 父亲 砍砍 柴房中 休学
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Restrained torsion of open thin-walled beams including shear deformation effects 被引量:7
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作者 Zhao-qiang WANG Jin-cheng ZHAO +1 位作者 Da-xu ZHANG Jing-hai GONG 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2012年第4期260-273,共14页
A first-order torsion theory based on Vlasov theory has been developed to investigate the restrained torsion of open thin-walled beams. The total rotation of the cross section is divided into a free warping rotation a... A first-order torsion theory based on Vlasov theory has been developed to investigate the restrained torsion of open thin-walled beams. The total rotation of the cross section is divided into a free warping rotation and a restrained shear rotation. In first-order torsion theory, St. Venant torque is only related to the free warping rotation and the expression of St. Venant torque is derived by using a semi-inverse method. The relationship between the warping torque and the restrained shear rotation is established by using an energy method. The torsion shear coefficient is then obtained. On the basis of the torsion equilibrium, the governing differential equation of the restrained torsion is derived and the corresponding initial method is given to solve the equation. The relationship between total rotation and flee warping rotation is obtained. A parameter λ, which is associated with the stiffness property of a cross section and the beam length, is introduced to determine the condition, under which the St. Venant constant is negligible. Consequently a simplified theory is derived. Numerical examples are illustrated to validate the current approach and the results of the current theory are compared with those of some other available methods. The results of comparison show that the current theory provides more accurate results, In the example of a channel-shaped cantilever beam, the applicability of the simplified theory is determined by the parameter study of λ. 展开更多
关键词 Thin-walled beam Restrained torsion Shear deformation WARPING Shear coefficient
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