用双剪屈服准则对钢筋混凝土板进行塑性铰线的极限分析

利用双剪屈服准则建立了用机动法计算钢筋混凝土薄板极限载荷的新的塑性铰线理论，并导出了双向布置钢筋的钢筋混凝土板的屈服条件，实例计算表明其更符合实验结果。     

横观各向同性层状弹性场地格林函数的数值解

采用横观各向同性层状弹性模型模拟半空间之上的层状场地,用人工透射边界代替半空间以吸收能量。利用薄层元素法给出任意节面上环形垂直及水平简谐荷载作用下场地的位移公式,并由此导出官类场地任意节面上在垂直及水平简谐集中荷作用下的位移响应显式解。算例表明本文方法与理论解相近,横观各向同性性质对格林函数有明显的影响。     

ANALYSIS ON TRANSVERSE IMPACT RESPONSE OF AN UNRESTRAINED TIMOSHENKO BEAM

A moving rigid-body and an unrestrained Timoshenko beam, which is subjected to the transverse impact of the rigid-body, are treated as a contact-impact system. The generalized Fourier-series method was used to derive the characteristic equation and the characteristic function of the system. The analytical solutions of the impact responses for the system were presented. The responses can be divided into two parts : elastic responses and rigid responses. The momentum sum of elastic responses of the contact-impact system is demonstrated to be zero, which makes the rigid responses of the system easy to evaluate according to the principle of momentum conservation.     

ANALYSIS ON IMPACT RESPONSES OF UNRESTRAINED PLANAR FRAME STRUCTURE(Ⅰ)—FORMULA DERIVATION

Introduction Recently,therehavebeenconsiderablestudiesontransientresponsesandwave propagationofrestrainedstructureswhicharebeingimpacted[1,2].But,fortheunrestrained structures,therearefewrelativeliteratureshavingbeenpublished.Unrestrainedstructures aremai…     

无约束平面框架结构冲击响应分析(Ⅰ)——公式推导

运用广义Fourier级数方法推导了无约束平面框架结构受运动刚体冲击时的瞬态动力响应公式,利用这些公式得到冲击系统动力响应解析解．在公式推导过程中得出结构系统中弹性响应的动量之和为零的结论．从公式推导可以看出,模态分析法同样可以用来解决此类冲击问题．