The changing regularity of pressure angle of ball joint and the optimum position region of pressure angle in given rod structure were proved through computer aided analysis 通过计算机辅助分析，求得了该点压力角的变化规律及给定杆系参数下压力角的最佳变化区间。
Secondly applying the finite element method , the model of suspension bridge and develops computer software system - sbcs are built in this paper 其次，应用有限单元法，建立了相应的悬索桥计算模型，利用平面杆系通用有限元计算程序进行结构分析，编制了悬索桥施工控制分析计算系统sbcs 。
The results show that the stress rate criterion applies for the judgment of the truss structural instability , and the criterion is more effective and definite in the local instability 结果表明，应力变化率准则可以有效判定杆系结构的动力失稳，并且在判定结构的局部失稳方面非常有效和明确。
According to the empirica1 design methqds , we can safe1y say that the method proposed can satisfy the 1imit state of load bearing capacity as we11 as that of the serviceabi1ity l imit state 根据钢筋混凝土杆系结构设计经验，可以认为该法同时满足了结构承载力极限状态和正常使用极限状态的要求。
Secondly , based on former researches , this part discusse the new method which is based on half implicit finite element method . the model ' s merits as well as its demerits are summarized 3 、利用有限元的数据结构进行河网描述(类似杆系结构) ，对于工程规划时增加河道断面问题，数据准备简单。
According to the demand of the revision of csdb , the program for the spectrum - based static elastic - plastic analysis of frame - shear wall structure is written by the finite element method 结合我国现行《建筑抗震设计规范》 ( gb50011 - 2001 )的要求，采用杆系单元编写了钢筋混凝土框架-剪力墙结构静力弹塑性有限元分析程序。
In this thesis , three factors resulting in geometric nonlinearity are taken into account , then using plane frame method and based on plane bar finite element , nonlinear analysis to the construction of cable - stayed bridge is achieved 考虑几何非线性的三个影响因素，然后利用平面框架模型，以平面杆系有限元法为基础对斜拉桥施工进行非线性分析。
Firstly , the basic principle of this method is described . then the line members with rigid parts and nonlinear bending and shear springs are adopted to model the structure and make the computation model for the push - over method 然后采用杆端弹塑性弹簧杆系模型对钢筋混凝土梁、柱等构件进行模拟，推导单元刚度阵和总刚，建立结构的计算模型，用于push - over计算。
Taking four spatial truss structures as examples , the structural dynamical stability analyze was carried out applying the stress rate criterion , and the data of the stress rate criterion analysis was compared with those of the displacement criterion analysis 以四种突间杆系结构为例，应用应力变化率准则进行了结构的动力稳定分析，并将结果同位移准则分析的结果进行了比较。
In this paper the reinforced concrete frame is simplified into pole model and hysteretic model in pole section with consideration of reduced stiffness . the failure criteria is whether the structure has formed mechanical angle 本文将钢筋混凝土框架结构简化为杆系模型，建立了考虑刚度退化的杆件截面层次上的三线型恢复力模型，并以结构形成机械较机构作为框架倒塌破坏的判断准则。
