【作者】 谢小松；

【导师】 周瑞忠；

【作者基本信息】 福州大学 ， 水工结构工程， 2004， 硕士

【摘要】 高层建筑钢结构的结构形式很多，但是钢框架结构是高层建筑钢结构最基本的一种结构形式。通常在设计框架的时候，都将框架节点考虑成刚度为无穷大得刚性节点或刚度为零的铰接节点。虽然对连接性能的这种理想化假设简化了钢框架的分析和设计过程，但采用理想的连接模型在很多情况下是不合理的，也不能反映结构工作的实际情况，计算结果误差很大，有时甚至会得到错误的结论。多次地震表明，采用完全焊接刚性节点的钢框架因节点延性差、残余应力大，容易发生脆性破坏，而半刚接钢框架因节点具有较强的变形能力和耗能能力可以抵抗一定的地震荷载。本文的目的是通过对钢结构在弹塑性条件下的抗震性能的分析研究，为钢结构抗震设计提供一定的理论参考。本文在介绍和分析半刚性连接弯矩与转角连接关系模型的基础上，用带有转动刚度的弹簧表征半刚性连接，推导出半刚性连接的刚度矩阵，并对杆件固端力进行修正，同时在考虑剪切变形、材料弹塑性、及构件的动力滞回性能的基础上，编制了结构弹塑性地震动力时程分析有限元计算程序。文中还通过工程实例的计算分析比较了半刚性连接对结构抗震性能的影响。分析表明：半刚接和刚接相比会使框架结构的柱顶侧移、层间位移、跨中弯矩、柱脚某些部位弯矩增大，而梁端弯矩和层间剪力减小。只要采取一定措施如给框架一定的支撑，加以限制结构在地震荷载作用下的变形，这样可以充分利用半刚接钢框架良好的抗震性能，节约工程造价。最后提出了在抗震设计中既符合工程实际又易于设计上应用的新设计方法及施工中的构造要求。更多还原

【Abstract】 There are many forms of tall steel structures, however frame structure is the most basal one. In conventional analysis and design of steel structures，it is usually assumed that the connections between columns and beams are either rigid or pinned . The analysis of steel frames adopting the assumption can simplify the procedure of analysis and design, but cannot precisely reflect structural practical circumstance and the errors of calculating results are large, even, get incorrect conclusions.In recent years, quite a lot of earthquakes in the world indicate that steel frames with welding joint easily occur brittle collapse because of having a low ductility at joints. Then, a semi-rigid connected steel frame has large the energy absorption capacity which can resist dynamic loads. The purpose of this paper gives some theoretic reference for seismic design of steel frame structure through the elastic-plastic analysis on the seismic capability of steel frame with semi-rigid connections under severe earthquakes.In the paper, at first, some models of relations between moment and rotation of semi-rigid connection are introduced. Then a semi-rigid joint behavior can be modeled as a finite stiffness rotation spring. Basing on rotation and displacement equation, we obtain the element stiffness matrixes with semi-rigid connections where the effects of material nonlinear, hysteresis behavior and shear forces in the connection deformations have been considered in and at the same time we modify the fixed-end forces. Finally, a program for calculating the elastic-plastic earthquake seismic of semi-rigid connected steel frame structure by step and step integration of wilson-θ.In this paper, the author compares and analyzes the effect of semi-rigid in the behavior of steel frame structures. The calculation results indicate that for steel frame in semi-rigid joints cases, the top story deflection, the displacement between two stories, the moment at the center of a beam and the initial end moment at column is larger, nevertheless the end moment at beam and the shear force between two stories<WP=4>may be smaller when compared to the rigid joints case. Effect of the semi-rigid joint can be reduced by some measures such as the use of bracing members. In this way, we can make good use of the excellent dynamic behavior of semi-rigid connect steel frame structure and decrease the cost of engineering. At last, some new design methods and demand in the constructing which are in accord to practice and easy to applied to design are put forward.更多还原