Semi-fine numerical simulation method for node of prestressed fabricated concrete structure

Abstract

The invention relates to a semi-fine numerical simulation method for a node of a prestressed assembly type concrete structure, which is used for establishing a semi-fine simulation model for simulating a beam column or column foot node of the prestressed assembly type concrete structure, and comprises the following steps of: 1, constructing a beam column unit grid; 2, simulating the precast concrete members through a plane stress unit, and simulating the contact surfaces between the precast concrete members through a contact unit; 3, simulating the mechanical changes of the common steel bars and the prestressed bars in the prefabricated concrete member through truss units; 4, simulating the steel bar energy dissipation pieces and other energy dissipation pieces in the model under the action of stress by using a truss unit or a special energy dissipater unit; 5, simulating the friction effect between the steel bars and the concrete in the model by setting a nonlinear spring method. Different unit methods are adopted for simulation through different components, the simulated steel bars are simplified, the requirement for node analysis stress is met, and it is guaranteed that the simulation process is accurate and simplified.

Description

technical field [0001] The invention belongs to the field of prestressed assembled concrete model simulation methods, in particular to a semi-fine numerical simulation method for prestressed assembled concrete structure nodes. Background technique [0002] Due to the advantages of fast construction speed, good economic benefits and low environmental pollution, prefabricated buildings have become a structural form widely used in the modern construction industry; the application of prestressed concrete structures in prefabricated buildings has light weight, high rigidity and With the advantages of recoverable deformation, it is an important structural form in line with prefabricated construction. At present, the conventional prefabricated concrete structure design mainly adopts the same design concept as cast-in-place, while the prestressed concrete structure, due to the use of dry connection or hybrid connection, has typical component joints and connection interfaces, and its...

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Problems solved by technology

At present, the conventional prefabricated concrete structure design mainly adopts the same design concept as cast-in-place, while the prestressed concrete structure, due to the use of dry connection or hybrid connection, has typical component joints and connection interfaces, and its macroscopic structural performance and microscopic force The mechanism and failure mechanism are very different from the traditional cast-in-place structure, and it is not suitable to mechanically apply the design method of the traditional cast-in-place structure; while in the design and analysis of the prestressed concrete structure system, accurate and efficient numerical simulation of the nodes, It is the key to fine structure analysis and design. Generally used finite element software performs numerical simulation on nodes. In the process of simplifying the model, there are heavy modeling workload, inaccurate simulation, difficult convergence of nonlinear analysis and calculation many problems

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