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《机械工程前沿(英文)》 2014年 第9卷 第2期 页码 191-202 doi: 10.1007/s11465-014-0293-y
In present study, free vibration of cracked beams resting on two-parameter elastic foundation with elastically restrained ends is considered. Euler-Bernoulli beam hypothesis has been applied and translational and rotational elastic springs in each end considered as support. The crack is modeled as a mass-less rotational spring which divides beam into two segments. After governing the equations of motion, the differential transform method (DTM) has been served to determine dimensionless frequencies and normalized mode shapes. DTM is a semi-analytical approach based on Taylor expansion series that converts differential equations to recursive algebraic equations. The DTM results for the natural frequencies in special cases are in very good agreement with results reported by well-known references. Also, the DTM procedure yields rapid convergence beside high accuracy without any frequency missing. Comprehensive studies to analyze the effects of crack location, crack severity, parameters of elastic foundation and boundary conditions on dimensionless frequencies as well as effects of elastic boundary conditions on cracked beams mode shapes are carried out and some problems handled for first time in this paper. Since this paper deals with general problem, the derived formulation has capability for analyzing free vibration of cracked beam with every boundary condition.
关键词: free vibration cracked beam elastic foundation restrained ends differential transform method
Experimental study on slender buckling-restrained knee braces with round steel bar cores
《结构与土木工程前沿(英文)》 2023年 第17卷 第1期 页码 99-121 doi: 10.1007/s11709-022-0875-4
关键词: weld-free beam-to-column connections moment-resisting frame cyclic and compression loading tests buckling-restrained knee brace cover tube
Lokavarapu Bhaskara Rao, Chellapilla Kameswara Rao
《机械工程前沿(英文)》 2013年 第8卷 第3期 页码 291-297 doi: 10.1007/s11465-013-0255-9
This work presents the existence of buckling mode switching with respect to the radius of concentric rigid ring support. The buckling mode may not be axisymmetric as previously assumed. In general, the plate may buckle in an axisymmetric mode but when the radius of the ring support becomes small, the plate may buckle in an asymmetric mode. The optimum radius of the concentric rigid ring support for maximum buckling load is also determined. Introducing internal rigid ring support, when placed at an optimal position increases the elastic buckling load capacity by 149.39 percent. The numerical results obtained are in good agreement with the previously published data.
关键词: buckling circular plate elastically restrained edge rigid ring support mode switching
Performance assessment of innovative seismic resilient steel knee braced frame
Tony T. Y. YANG,Yuanjie LI
《结构与土木工程前沿(英文)》 2016年 第10卷 第3期 页码 291-302 doi: 10.1007/s11709-016-0340-3
关键词: buckling restrained brace innovative structural system collapse simulation seismic assessment
标题 作者 时间 类型 操作
free vibration analysis of cracked beams resting on two-parameter elastic foundation with elastically restrainedends
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期刊论文
Fundamental buckling of circular plates with elastically restrained edges and resting on concentric rigid
Lokavarapu Bhaskara Rao, Chellapilla Kameswara Rao
期刊论文