A moment frame is disclosed for a sloped roof construction. The moment frame includes a lateral bracing system having a high initial stiffness and including yield links capable of effectively dissipating energy generated within the lateral bracing system under lateral loads.

A lateral bracing system is disclosed for affixing a column to a beam in a construction. The lateral bracing system includes a pair of buckling restraint plates, one each affixed to a top and bottom flange of a beam. The lateral bracing system further includes at least one yield plate for each buckling restraint plate. Each yield plate includes a first end affixed to the column, and a second end affixed to the beam.

A system, method and apparatus of connecting a beam to a column includes a haunch including a first haunch side coupled to a first side of the beam and a bend plate secured to a first end of the haunch. The haunch is coupled to the column by the bend plate separated from the column by a spacer plate. A top plate extends a first distance along a top surface of the beam and the top plate includes a column opening encompassing the column, the top plate is secured to the top surface of the beam. A first edge of the spacer plate can be separated from a second haunch side by a yielding region, wherein the second haunch side is opposite from the first haunch side. The bend plate can be welded to the first end of the haunch.

A dry connection prefabricated assembly steel-concrete composite beam, comprising a steel beam (400), a concrete slab (300) composed of steel bars (301) and concrete, a steel plate connector (100) composed of a steel plate (101), shear connection pieces (102) and connection rods (103), and a pair of inter-plate connection pieces respectively composed of an upper connection plate (501), a lower connection plate (502), a horizontal connection plate (503), a triangular reinforcing steel plate (504) and first and second shear connection pieces (505, 507). An upper surface of each horizontal connection plate (503) is vertically connected to the upper connection plate (501) and the first shear connection pieces (505), a lower surface is vertically connected to the lower connection plate (502), the triangular reinforcing steel plate (504) is welded between a lower surface of the horizontal connection plate (503) and a side surface of the lower connection plate, and one side surface of the upper connection plate (501) is horizontally connected to the second shear connection pieces (507). Both ends of the steel bars (301), which are laterally preset within the concrete slab (300), are provided with screw threads, and the screw thread ends of the steel bars respectively pass through bolt holes (509) and work holes (5010) arranged at upper ends of the upper connection plates (501) to be fixedly connected via screw nuts (302). The composite beam reduces on-site workload, and facilitates disassembly.

A lateral bracing system having high initial stiffness and including yield links capable of effectively dissipating stresses generated within the lateral bracing system under lateral loads.

A structural fuse is disclosed including a fuse base and a fuse plate extending from the fuse base. The fuse plate may include a reduced diameter yield section configured to yield at loads on the structural fuse above a threshold. The reduced diameter yield section includes a pair of slots on either side of the yield section, which slots receive a pair of spacers. The spacers are integrally formed as part of the fuse plate, and remain attached to the fuse plate during fabrication of the structural fuse.

A structural fuse is disclosed including a fuse base and a fuse plate extending from the fuse base. The fuse plate may include a reduced diameter yield section configured to yield at loads on the structural fuse above a threshold. The reduced diameter yield section includes a pair of slots on either side of the yield section, which slots receive a pair of spacers. The spacers are integrally formed as part of the fuse plate, and remain attached to the fuse plate during fabrication of the structural fuse.

A method of retrofitting a pre-Northridge type steel beam-to-column connection, includes welding the web of the beam to a flange of the column and slotting the beam web in the region of the connection and near the beam flanges. Stress relief holes are made into the web of the beam and slots are cut into the web of the beam. A top backup bar is welded to the flange of the column and a bottom backup bar is removed from the flange weld to the column. The method includes back gouging the flange of the column at a position of the removed backup bar and welding a bottom flange of the beam to the flange of the column.

A buckling-restrained brace with a flat energy dissipation element, a building with the brace and an assembly method of the brace belongs to the field of force-resisting members of structural engineering. The brace includes a telescopic inner restrained member, an outer restrained member sleeved outside the inner restrained member, and the flat energy dissipation element between the inner and outer restrained members; the inner restrained member includes a first and a second steel square tube which are connected; the flat energy dissipation element includes four flat fuses, and two ends of each fuse are connected to four sides of the first and second steel square tube by bolts; and the inner section of the outer restrained member is square, the outer restrained member covers the flat energy dissipation element, and a certain gap is disposed between the outer restrained member and the flat energy dissipation element.

A column body (3) is, for example, an H steel column. Abase plate (5) is joined to the lower end of the column body (3). Anchor bolts (9) are inserted into a foundation (7) and are fixed thereto. Slits (13a), (13b) are provided in the base plate (5). The slits (13a), (13b) are formed in mutually different directions. The slits (13a), (13b) are formed so as to surround the anchor bolts (9) (holes of the base plate (5)). More specifically, the anchor bolts (9) are surrounded from a plurality of directions by the slits (13a), (13b) formed in a plurality of different directions.