5 results about "Bond slip" patented technology

This invention relates to a method for establishing a constitutive model of localized bond in ultra-high performance concrete (UHPC) structures and its finite element method implementation. Firstly, based on the energy release rate per unit crack surface, a coarse aggregate-fiber competitive fracture index is proposed. Based on this, a multi-field coupled effective fiber weighting function is constructed, explicitly incorporating factors such as coarse aggregate volume fraction, particle size, tensile strength, fiber content, bond length ratio, and cover thickness ratio. Furthermore, an internal state variable representing the degree of coarse aggregate participation is introduced within a four-stage bond-slip framework, expressing the bond stress as a superposition of three parts: matrix, fiber bridging, and coarse aggregate-rib mechanical interlocking. A dedicated UHPC-CA-reinforcement interface element and numerical implementation scheme are designed, which can improve the accuracy and engineering usability of the analysis of anchorage and lap zone in UHPC containing coarse aggregate.

The application provides a joint bending stiffness calculation method, an electronic device and a storage medium. The method comprises the following steps: when a test beam is subjected to graded loading, the joint opening amount of the node area of the test beam and the actual strain of the anchorage reinforcement in the non-node area of the test beam under different load states are measured respectively; the structure parameters of the test beam are obtained, and the bond slip amount of the non-node area under different load states is calculated respectively according to the structure parameters and the actual strain; and the joint bending stiffness is calculated according to the bond slip amount and the joint opening amount. The application can improve the calculation accuracy of the joint bending stiffness of the anchorage joint.

The application provides a lightweight super high-performance concrete and steel bar bonding slip calculation method and device, comprising: determining a preset number of pull-out test pieces according to test piece parameters; respectively performing pull-out tests on each pull-out test piece, obtaining a target bonding slip curve of the lightweight super high-performance concrete and the steel bar according to all pull-out test results; and setting a bonding slip curve model and a preset number of function relationship formulas according to the target bonding slip curve, and calculating a bonding slip curve of a to-be-tested pull-out test piece. Through the pull-out tests on the preset number of pull-out test pieces, the bonding slip curve model and the function relationship formulas are set, so that when the to-be-tested pull-out test piece is used subsequently, the bonding slip curve of the pull-out test piece is obtained through the bonding slip curve model and the function relationship formulas, the bonding performance is obtained, and the pull-out test piece does not need to be tested again, the processing process of the pull-out test piece is reduced, and the promotion and application of the concrete structure are improved.