Behavior of dendriform connections of concrete filled steel rectangular tubes

According to the principles of strong node but weak member in the anti-seismic design of steel frames,two methods are used to reinforce the column-tree moment-resisting and beam-to-column connections,then the 3D finite element method is adopted,and the reinforced node form is compared with the traditional connections.

By observing the joints,three kinds of joints were distinguished: planar joints,"reverse fan-type" columnar joints and "orthotropus-type" columnar joints.

Rhyolite with columnar joints has been found in the lower Cretaceous Yingcheng Formation,in an uplift area of the southeastern Songliao Basin.

The prismatic joint characteristics of the Mesozoic rhyolite of the Shanmen, Siping, Jilin Province and its origin significance;

In Shanmen,Siping,Jilin province,the early Cretaceous rhyolite has typical distributive characteristics of the paleovolcanic apparatus,preserving rare,well-developed prismatic joint.

The authors of this paper found a kind of columnar jointing in the Cretaceous clastic rocks in the Mellit area, western Sudan.