Experimental Study On Behavior Of Steel-Masonry Composite Structure In Masonry Structure That Have Column

In recent years, with the high speed of construction, construction industry is booming across the country. It is proposed to during the second five accelerate the urbanization process of building comprehensively during the twelfth five-year in the just-concluded National People's Congress, At the end of the twelfth five-year urbanization reached an unprecedented level. City buildings will be gradually developed into a business district, in the urbanization process, commercial buildings often require a relatively large use of space. The former buildings can not meet the functional requirements, there are two ways to solve this, one is demolition and reconstruction. However, demolition and reconstruction is bound to cause unnecessary waste of resources, and will also produce large amounts of construction waste, causing environmental pollution. Faced with this problems, more appropriate solution is to transform the original construction,for masonry structure housing the key technology is breaking down the wall and underpinning.Most of the traditional underpinning will involve wet operations, and long construction period, the increase of cross-section and affecting space using and appearance. They are all neglecting the carrying capacity of the upper wall. This study connects the upper wall and the lower wrapping angle iron underpinning beam to forming an entirety, the carrying capacity of the wall is fully considered. In other words, underpinning transformation is carried out in the form of wall-beam.By the four sets of static test specimens, we get the load-strain curves, load-deflection curves, cracking load,ultimate load and other performances. This paper also studies the mechanical behavior and failure mechanism of underpinning structure under the vertical loads, and simultaneously explores the affects of different factors to the structural bearing capacity. The results show that, in the loading process, outsourcing angle iron with the upper wall to form a system of the wall-beam structure, that is, compression brick arch,the rod of angle iron and the steel in ring beam make up the force model of the wall-beam; the final form of breaking is wall baroclinic damage that is one of wall-beam wall shear damage; underpinning beam can be simplified to be a truss; structural column provide a good anchorage for horizontal steel in the wall, and make the load pass path more reasonable and greatly improve the sample carrying capacity; angle iron size and ring beam affect the beam stiffness and the bearing capacity of the specimen; the wall shear bearing capacity of this design can calculate according to the wall-beam wall shear design calculation formula in the code for design of masonry structures, but the result is very conservative.