Measures For Improving Bearing Capacity Of Special Shaped Column Joints In High Earthquake Intensity Region

Special-shaped column structure avoids the column angle when rectangular column generated, indoor no columns edges, easy furnishings and interior decoration, better ornamental, the net area of the building is high, so this kind of new residential structure system suitable for the development of residential housing industry, and has a broad development prospects. At the same time, the special-shaped column structure with light, heat preservation, heat insulation, high efficiency of wall materials as filler wall and inner wall, accord with national policy of environmental protection and energy saving.Special-shaped column joints with respect to the rectangular nodes,sectional height to width ratio is large and the junction of the beam to column dense steel bars, concrete is not easy to vibrating close grained, so the special-shaped column joints than rectangular column beam column joints is more weak, its damage is more serious. Because of the complex structure of the core area of the special shaped column frame joint, the shear failure is often easy to happen, which greatly limits the height of the structure, and also affects the promotion of the special-shaped column structure in the high earthquake intensity region.In order to solve the low bearing capacity of special-shaped column joints and and limit the special-shaped column structure promotion and use of problem, this paper mainly from the strengthening measures of special-shaped columns to start, at present of the special-shaped columns of some common strengthening measures mainly include:steel reinforced concrete special-shaped column, fiber reinforced concrete special-shaped column, high strength concrete special-shaped columns, nodes equipped with X shaped reinforced concrete special-shaped columns and Special-shaped column nodes vertical plus axillary and the like, Focus on steel reinforced concrete special-shaped columns.Part I:analysis fiber reinforced concrete special-shaped column, high strength concrete special-shaped column, nodes equipped with X shaped reinforced concrete special-shaped columns and Special-shaped column nodes vertical plus axillary stress performance, listed the node bearing capacity calculation method, construction requirements and construction methods.Part II:study the component force performance of steel reinforced concrete special-shaped columns and node force performance, gives the steel reinforced concrete special-shaped column bearing capacity calculation method, mainly studied the shear bearing capacity calculation method of node area, analysis and comparison of the different nodes bearing capacity calculation method of the advantages and disadvantages, based on derived node force calculation formula of shear bearing capacity of steel reinforced concrete special-shaped column component. The calculation formula of shear capacity of the joint area is derived.Part III:through the intends to static experimental study on a new nodes and enhance the form:nodes equipped with acral fasting and perforated plate, through the experimental study on the specimen in different circumstances with steel in the form of a specimen internal reinforcement strain, strength degradation and ultimate bearing capacity of the specimens, and evaluate and analysis of experimental results.Part IV:simple study isolation technology in the application of the special-shaped column structure, the isolation cases overall seismic performance of special-shaped column structure, summarizes the research achievements of predecessors and related suggestions are put forward.