对两种几何特征的圆钢管空间相贯节点进行了静力单调和反复加载的实验研究，以作为进一步研究钢管桁架抗震性能的基础。设计了专用的加载装置以对试件中的杆件和节点施加较大内力。通过对5 试件的实验，得到了节点滞回特性曲线。研究揭示了这类节点塑性变形沿首次塑性开展方向累积的特点，并指出单调加载曲线可以基本包覆滞回曲线。实验表明，采用相贯节点的钢管结构，其滞回特性取决于节点的滞回行为。对给定节点在反复加载下的变形能力和耗能能力进行了量化评价。

In this paper, shaking table tests of two shallow reticulated shells under earthquake loading were described. Local and global dynamic instabilities were observed in the test and time-istory curves for stresses of members and nodal displacements were given respectively. It was shown that there were sudden changes in these curves, which were regarded as the signs of local and global dynamic instability. Based on test results, the law of structural dynamic instability was summarized, the definition of dynamic instability and several practical criteria proposed by the authors were illuminated. Finally, some calculation results from theoretical analyses of the two models under static and dynamic loading were given. By comparison of them, it can be seen that there are many common properties that reflect the stability behaviors and can be used to determine the state of static and dynamic stability of structures.