Design and Construction Technology of Prefabricated Reinforced Concrete Slab Culverts

Compared with traditional cast-in-situ concrete slab culverts,prefabricated reinforced concrete slab culverts can be produced more quickly and has strong quality controllability,strong earthquake resistance,and repeatability.They will be the primary production method of slab culverts in the future.This article offers a comprehensive review of the design and construction technology associated with prefabricated reinforced concrete slab culverts.The objective is to provide a valuable reference for related enterprises,enhance the quality of design and construction in precast pile configuration,and,in turn,contribute to the advancement of construction projects within our country.

Comparison of Low Rise Residential Industrialized Building Systems in Turkey

Industrialized building systems came into the agenda in response to requirements of earthquake resistance and rapid construction in Turkey after 1999 Izmit earthquake. CFS （cold-formed steel） framing system is able to meet the existing requirements in the field of low rise residential. But, objective comparison is required for the selection of structural systems used in low rise residentials. CFS system is compared with timber frame and reinforced concrete building systems in terms of design and applicability criterion in circumstances of Turkey, and the results of this comparison are presented in this study. In order to compare building systems objectively, a sample project, has been designed and studied on it. Three structural systems have been separately applied over this project designed in consideration of existing housing stock and preferences of the construction industry of Turkey Evaluation method with different values is selected in comparison and properties of three different structural systems are graded according to evaluation method. As a result of comparison, the CFS system is the most advantageous low rise residential prefabricated construction system in terms of design and applicability

Flexural behavior of textile reinforced mortar-autoclaved lightweight aerated concrete composite panels

To improve the deficiencies of prefabricated autoclaved lightweight aerated concrete(ALC)panel such as susceptibility to cracking and low load-bearing capacity,a textile-reinforced mortar-autoclaved lightweight aerated concrete(TRM-ALC)composite panel was developed in this study.One group of reference ALC panels and five groups of TRM-ALC panels were fabricated and subjected to four-point flexural tests.TRM was applied on the tensile side of the ALC panels to create TRM-ALC.The variable parameters were the plies of textile(one or two),type of textile(basalt or carbon),and whether the matrix(without textile)was applied on the compression side of panel.The results showed that a bonding only 8-mm-thick TRM layer on the surface of the ALC panel could increase the cracking load by 180%−520%.The flexural capacity of the TRM-ALC panel increased as the number of textile layers increased.Additional reinforcement of the matrix on the compressive side could further enhance the stiffness and ultimate loadbearing capacity of the TRM-ALC panel.Such panels with basalt textile failed in flexural mode,with the rupture of fabric mesh.Those with carbon textile failed in shear mode due to the ultra-high tensile strength of carbon.In addition,analytical models related to the different failure modes were presented to estimate the ultimate load-carrying capacity of the TRM-ALC panels.