Experimental Study on Seismic Behavior of Composite Shear Wall with Inclined Bars

The composite shear wall is the core component of the thermal insulation integrated structure, which is a load-bearing shear wall with good thermal insulation, sound insulation, and seismic resistance. To improve the applicable height of the composite shear wall structure, a cohesive sandwich heat-insulation composite shear wall with door frame inclined tendon and diamond-shaped inclined tendon is proposed, and the quasistatic force of four 1/2-scale shear wall test specimens is carried out. Different specimens are analyzed, including failure modes, hysteresis curves, skeleton curves, stiffness degradation, ductility performance, and energy dissipation capacity. The following conclusions are drawn: the failure modes of the specimens are bending and shear failure; the ultimate strength and deformation performance of the composite wall close to the solid wall; the composite wall with the door frame inclined tendon can effectively delay the wall cracking and improve the bearing capacity and energy consumption capacity of the composite wall; the configuration of the diamond-shaped inclined tendon improves the ductility and energy dissipation capacity of the composite wall.

Experiment and Numerical Simulation of Wooden Door Frame

To prevent the wooden door frame of traditional rural houses from being stuck due to diamond deformation under earthquake and improve the seismic capacity of rural houses, an innovative method of reinforcing the angular displacement of the wooden door frame with channel steel and the diagonal brace is proposed. The rationality of the finite element simulation is demonstrated by comparing the results of finite element simulation and quasistatic test based on reinforced and unreinforced wooden door frame specimens. On the basis of the finite element model of wooden door frame, the seismic performance of channel type and diagonal brace thickness of reinforced wooden door frame and the seismic performance of friction coefficient of unreinforced wooden door frame are studied, respectively. The results show that the lateral stiffness and the lateral bearing capacity of the reinforced wooden door frame increase with the increase of channel steel type and the diagonal brace thickness. The height of the channel steel section of the seismic reinforcement structure should be half of the unreinforced structure. With the increase of the friction coefficient, the lateral bearing capacity of the unreinforced wooden frame increases, while the ductility of the unreinforced wooden frame decreases.

Editorial: Housing

I have an early memory of entering my childhood home: entering through a screened back door, I pass a door frame where my height, along with that of my brother and sisters, was faithfully recorded through the years in ascending pencil marks and corresponding dates. In the kitchen, with its garish 1970s red and orange wallpaper, I recall seeing my mother waiting for me with some delicious snack. Over the years, I have called 19 different places home, on four continents, and could conjure such evocative memories for each.

A Study on Major Issues in Litigation on Fire Door Performance

In this study, we attempted to analyze the predominant issues that have emerged from the fire door litigation process that has been conducted until recently, and to suggest alternatives. The results of analyzing the contents and outcomes of fire door litigation were confirmed by the issue of the durability period of the fire doors’ fire protection performance. Further, they were supported by the confirmation of the fire protection performance of fire doors that have already been installed, and the extent of the defect repair when the fire door performance is not confirmed. To solve these issues, performance verification must be executed at the manufacturing, delivery, and construction stages of fire doors. In the use stage, after completion, the user (Resident) should be the subject of performance maintenance. To this end, it is necessary to introduce the duty of maintenance and management of fire doors at the stage of use and the introduction of a professional inspection system that carries out inspections. Additionally, since the soundness of the fire door frame was confirmed through simulation and test results, the fire protection performance of the fire door in use can be confirmed by only separating the door. This can be achieved by excluding the door frame and conducting a test. It is considered that performance can be sufficiently secured despite the performance of the fire door being confirmed to be inferior, even if performance is improved by limiting the repair range to fire door pairs.