Strength: the ability of a member's cross-sectional material or connection to resist damage. Strength calculation is a calculation to prevent structural members or connections from being damaged due to excess material strength
Carrying capacity: the maximum internal force that the structure or component will not be damaged due to factors such as strength, stability or fatigue; or the maximum internal force when the plastic analysis forms the destruction mechanism; or the internal force when the deformation is not suitable for continued load.
Brittle fracture: generally refers to the brittle fracture that occurs suddenly without warning plastic deformation of the steel structure under tensile stress.
Standard value of strength: steel yield point (yield strength) or tensile strength specified by national standards.
Design value of strength: the standard value of strength of steel or connection divided by the corresponding resistance sub-factor coefficient.
First-order elastic analysis: without considering the effect of the second-order deformation of the structure on the internal force, the equilibrium conditions are established according to the undeformed structure, and the internal force and displacement of the structure are analyzed according to the elastic stage.
Second-order elastic analysis: consider the influence of the second-order deformation of the structure on the internal force, establish equilibrium conditions according to the structure after displacement, and analyze the internal force and displacement of the structure according to the elastic stage.
Buckling: the rod or plate suddenly undergoes a large deformation that is inconsistent with the original stress state and loses stability under the axial pressure, bending moment, shear force alone or together.
Post-buckling strength of web: after web buckling, it can still maintain its ability to bear load.
General height-to-thickness ratio: the parameter whose value is equal to the square root of the quotient of the bending, shearing or compressive yield strength of the steel divided by the corresponding web bending, shearing or local compression elastic buckling stress.
Overall stability: under the action of external load, an assessment of whether the entire structure or member can buckle or fail.
Effective width: the width when calculating the strength and stability of the section.
Effective width factor: the ratio of the effective width of the board to the actual width of the board.
Calculated length: the geometric length of the member between its effective restraint points is multiplied by the equivalent length considering the coefficient of the deformation of the rod end and the load applied to calculate the slenderness ratio of the member. The length of the weld used when calculating the strength of the weld.
Slenderness ratio: the ratio of the calculated length of the member to the radius of gyration of the section of the member.
Conversion of slenderness ratio: in the overall stability calculation of the axial compression member, according to the principle of equal critical force, the lattice structure member is converted into a solid web member to calculate the corresponding slenderness ratio or bending and twisting The torsional instability is converted to the slenderness ratio used in bending instability.
Supporting force: the lateral support provided for reducing the free length of the compression member (or the compression flange of the member) needs to be applied in the buckling direction of the supported member (or the compression flange of the member) The lateral force at the shear center of the cross-section of the member (or the edge of the member under compression).
Unsupported pure frame: a frame that depends on the bending capacity of members and nodes to resist lateral loads.
Strong supporting frame: in the supporting frame, the supporting structure (supporting truss, shear wall, elevator shaft, etc.) has a high resistance to lateral displacement and can be regarded as a frame without lateral displacement.
Weak support frame: in the support frame, the rigidity of the support structure against lateral displacement is weak, and the frame cannot be regarded as a frame without lateral displacement.
Swing column: the two ends in the frame are hinged columns that cannot resist lateral loads.
Node web of column web: the area where the frame web is just connected to the node, and the column web is within the height of the beam.
Spherical steel bearing: the steel spherical surface that enables the structure to rotate in any direction at the bearing serves as a force-transmitting hinged bearing or a movable bearing.
Rubber bearing: the rubber and thin steel plate and other composite materials that meet the displacement requirements of the bearing are used as the bearing to transmit the reaction force of the bearing.
Main pipe: in the steel pipe structural member, the pipe parts that pass through continuously at the nodes, such as chords in the truss.
Branch pipe: in the steel pipe structure, the pipe is disconnected at the node and connected to the main pipe, such as the web rod connected to the main pipe in the truss.
Gap node: the tube node where the toes of the two pipes are separated by a certain distance.
Overlap node: the node where the two pipes overlap with each other at the steel tube node.
Plane tube node: a node where the branch pipe and the supervisor are connected to each other in the same plane.
Space tube node: a tube node formed by connecting the branch pipe and the main pipe in different planes.
Composite member: a member composed of more than one steel plate (or section steel) connected to each other, such as a composite beam or column with an I-shaped cross-section or a box-shaped cross-section.
Steel and concrete composite beam: a beam that can be subjected to overall stress by combining a concrete wing plate and a steel beam through a shear connection.
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