Resilient, efficient, versatile

[国外交通期刊数据库] 作者:Seroky, J.

Foam-void precast concrete double-tee members

[国外交通期刊数据库] 作者:Jonnalagadda, Srimaruthi;Sreedhara, Sachin;Soltani, Mahmoodreza;Ross, Brandon E.

摘要:This paper presents an experimental study of precast concrete double-tee members with foam voids cast in their stems. Extruded polystyrene foam boards were placed in the stems of the double-tee members to produce foam-void double tees. The foam-void double-tee specimens in the test program had 4% to 8% less self-weight than comparable solid double-tee members. The motivation for this study was to reduce the self-weight and thereby increase the number of situations where two precast concrete double-tee members can be shipped on a single truck. The experiential program used four 35 ft (10.7 m) long specimens with either 1 or 2 in. (25.4 or 50.8 mm) thick foam voids. Two of the specimens were built using normalweight concrete and the other two using semilightweight concrete. Specimens were subjected to flexural and shear loading. The results demonstrated that when properly detailed and fabricated, foam-void double-tee members can provide sufficient structural capacity for common service and ultimate loading.

Seismic behavior of unbonded post-tensioned precast concrete members with thin rubber layers at the jointed connection

[国外交通期刊数据库] 作者:Kalliontzis, Dimitrios;Sritharan

摘要:The use of precast concrete members with jointed connections for seismic applications has gained momentum recently; however, these systems may have limited application in seismic regions. This is because their dominant mechanism of impact damping is considered to be inadequate to dissipate the seismic energy imparted to them. With no hysteresis elements, precast concrete members with jointed connections may undergo long durations of motion and large lateral drifts when subjected to seismic loads. This paper investigates a method that can allow these members to dissipate the seismic energy efficiently by having them rock on a thin rubber layer that is placed at the jointed connection. Experiments that examine the use of various classes and layer thicknesses of rubber show that this method can improve damping in these members. Using experimental and numerical data, this paper quantifies the energy dissipation and seismic responses associated with this use of rubber. It is shown that rubber layers with high shore hardness of 90 and thickness between 6.35 and 25.4 mm (0.25 and 1 in.) improve the amount of damping in lateral-load-resisting systems using precast concrete members and produce satisfactory seismic response for these systems.

Thank you to reviewers

[国外交通期刊数据库]

摘要:Thank you to reviewers

Embrace the Future

[国外交通期刊数据库] 作者:Jim Voss

摘要:Embrace the Future

Eight added to PCI Titans

[国外交通期刊数据库]

摘要:Eight added to PCI Titans

2014 Educator Awards presented at convention

[国外交通期刊数据库] 作者:Yahya Kurama

摘要:2014 Educator Awards presented at convention

PCI website gets new member dashboard

[国外交通期刊数据库]

摘要:PCI website gets new member dashboard

Northeast Prestressed Products receives T. Henry Clark Award, future awards to be revised

[国外交通期刊数据库]

摘要:Northeast Prestressed Products receives T. Henry Clark Award, future awards to be revised

Fall 2014 PCIJournalfeature article wins Construction Writers Association award

[国外交通期刊数据库]

摘要:Fall 2014 PCIJournalfeature article wins Construction Writers Association award