3results about How to "Improve structural ductility" patented technology

The invention discloses a composite protective structure resistant to blast shock which is mainly a point truss honeycomb integral protective structure formed by a honeycomb tensile layer and a lattice truss-type compression resistance layer through welding spots and connecting keys, and a foam energy absorbing layer is added on the outer layer. According to the composite protective structure, theforce transmission path of a concrete protective structure under the action of blast is innovatively optimized, the resistance level of the protective structure can be greatly improved, and the structure ductility is improved; and the dispersion of concrete fragments in the structure can be restrained, and the phenomenon of blast and explosion-induced collapse of similar traditional concrete protective structures is eliminated.

The invention discloses an anti-progressive-collapse reinforcement design method for a steel support, belongs to the field of buildings, and solves the problem of how to design the steel support for progressive collapse. The method comprises the following steps: calculating a limit load beta max of a structure, and defining a critical load coefficient lambda as a ratio of a design load to the limit load; assuming that the number of the supports is k, the bearing capacity provided by a single support is (1-lambda) * (1.2 DL + 0.5 LL) / k; according to the method, a reinforced column and another adjacent column are dismantled at the same time, and the bearing capacity provided by a single support in different working conditions is calculated; the maximum bearing capacity max [(1-lambda) * (1.2 DL + 0.5 LL) / k] provided by a single support in all working conditions is obtained, and the axial force of the single support can be obtained according to a structural mechanics formula; and checking calculation and model selection are carried out on a single support section according to 'Steel Structure Design Standard' (GB 50017-2017).

The present invention relates to the technical field of building wood, and provides a composite regenerated keel, comprising: a wood core structure (1), which is composed of multiple layers of wood core (2) stacked; a first fixing structure (3), which is arranged between the wood cores (2) of each layer, and fixes and connects the wood cores (2) of each layer; a second fixing structure (4), which is wrapped and tied around the outer periphery of the wood core structure (1), and fixes the wood core structure (1); a third fixing structure (5), which is arranged around the outer periphery of the second fixing structure (4) and the wood core structure (1), and is thermoplastically formed with the wood core structure (1). According to the scheme of the present invention, the present invention can prevent the brittle bending fracture of the keel wood core, increase the structural ductility, and improve the shear and bending strength of the keel structure; at the same time, it can reduce the contact between wood and polypropylene resin materials and air, increase the durability of the keel structure, improve the material turnover rate, realize the resource recycling of waste materials, and be more low-carbon and environmentally friendly.