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Segmental bridge
A segmental bridge, also called a segmental concrete bridge, is a concrete bridge whose deck is built from short segments joined by post-tensioning, first used in Europe in the 1950s.
Segmental lining (tunnel)
A segmental lining is a tunnel wall built from precast reinforced-concrete segments erected ring by ring behind a tunnel boring machine, serving as the permanent support of shield-driven tunnels.
Seikan Tunnel (青函トンネル)
The Seikan Tunnel (青函トンネル) is a 53.85 km railway tunnel crossing the Tsugaru Strait to connect Japan's islands of Honshu and Hokkaido, opened in March 1988.
Seismic analysis
Seismic analysis is the structural engineering practice of computing how a building responds to earthquake ground motion, using methods such as equivalent lateral force and response spectrum analysis.
Seismic isolation bearing
A seismic isolation bearing is a device between foundation and superstructure that allows relative motion during earthquakes while dissipating energy, lengthening the vibration period to reduce seismic forces.
Seismic metamaterials
Seismic metamaterials are engineered periodic structures built in soil or at building bases that block or redirect seismic waves, demonstrated at full scale near Grenoble in 2012.
Seismic retrofit
A seismic retrofit, also called seismic retrofitting or an earthquake retrofit, improves an existing building's resistance to seismic loads through interventions designed after evaluation of its structure.
Selective withdrawal
Selective withdrawal is the extraction of fluid from one chosen depth of a density-stratified body of fluid, most commonly water from a stratified reservoir through a multilevel outlet.
Self-anchored suspension bridge
A self-anchored suspension bridge is a suspension bridge whose main cables anchor to the stiffening girder itself, eliminating massive ground anchorages and suiting spans of roughly 100–400 m.
Self-consolidating concrete
Self-consolidating concrete (SCC), also called self-compacting concrete, is highly flowable, nonsegregating concrete that fills formwork without vibration; it was developed in Japan in the late 1980s.
Self-healing concrete
Self-healing concrete (SHC) is concrete engineered to repair its own cracks without human intervention, through intrinsic chemistry or added bacteria, microcapsules, or vascular networks that release healing compounds.
Selimiye Mosque
The Selimiye Mosque (Selimiye Camii) is a 16th-century Ottoman imperial mosque in Edirne, Turkey, commissioned by Sultan Selim II and built by Mimar Sinan between 1568 and 1575.
Selimiye Mosque and its Social Complex
The Selimiye Mosque and its Social Complex is a UNESCO World Heritage mosque in Edirne, Turkey, designed by Sinan and built from 1568 to 1575.
Semi-detached
A semi-detached house, also called a twin house, is a dwelling sharing one common wall with a single neighboring house, the pair forming a block of two.
Semmering Base Tunnel
The Semmering Base Tunnel (German: Semmering-Basistunnel) is a 27.3 km twin-tube railway tunnel under construction between Gloggnitz and Mürzzuschlag, Austria, with final breakthrough in 2024 and opening planned for 2029.
Senegal River Basin Development Authority
The Senegal River Basin Development Authority, known in French as the OMVS, is an intergovernmental organization created in 1972 by Mali, Mauritania, and Senegal to jointly develop the Senegal River basin.
Seokguram Grotto and Bulguksa Temple
Seokguram Grotto and Bulguksa Temple (석굴암과 불국사): 8th-century Silla Buddhist monuments on Mount Tohamsan, Gyeongju, begun by Kim Dae-seong in 751, completed 774, Korea's first UNESCO World Heritage Site (1995).
Seongsu Bridge (성수대교)
The Seongsu Bridge (성수대교) is a road bridge across the Han River in Seoul whose 1994 collapse killed 32 people and prompted South Korea's infrastructure safety reforms.
Seoul Metropolitan Library
The Seoul Metropolitan Library (서울도서관) is the central public library of Seoul, South Korea, opened in 2012 in the former Seoul City Hall building at 110 Sejong-daero, Jung-gu.
Seoul National University Hospital
Seoul National University Hospital (서울대학교병원, SNUH) is a university hospital and special corporation in Jongno-gu, Seoul, serving as South Korea's national central hospital; it was founded as Jejungwon in 1885.
Seoul waterworks
Seoul waterworks (서울 상수도) is the municipal system treating and piping drinking water in Seoul, South Korea, begun in 1908 and reaching full coverage in the 1990s.
Separate sewer system
A separate sewer system collects wastewater and stormwater in two distinct pipe networks: sanitary sewers send sewage to treatment, and storm sewers carry runoff to waterways.
Septic drain field
A septic drain field, also called a leach field, is the part of an onsite septic system where perforated pipes release effluent into soil that filters it before it reaches groundwater.
Septic tank
A septic tank is a buried, water-tight container that treats household wastewater on site, settling solids as sludge, floating grease as scum, and draining effluent to a soil drainfield.
Sepulveda Dam
Sepulveda Dam is a 1941 flood-control dam on the Los Angeles River in the San Fernando Valley, built and operated by the U.S. Army Corps of Engineers.
Sequencing batch reactor
A sequencing batch reactor (SBR) is a wastewater treatment process in which aeration, reaction, settling, and decanting occur sequentially in one tank, treating municipal and industrial wastewater.
Seraglio
A seraglio, also spelled seray or serail, is the women's quarters, or harem, of a Muslim house or palace, and formerly named the Sultan's palace at Constantinople.
Sessions House
Sessions House: English quarter sessions courthouse buildings; the best known is the Grade I listed 1676-8 Sessions House on George Row, Northampton, attributed to Henry Bell, with plaster ceilings by Edward Goudge; other examples at Clerkenwell, Lincoln, Boston, and Spalding.
Seth L. Pearlman
Seth L. Pearlman is an American geotechnical engineer who led Menard's North American ground improvement business and was elected to the National Academy of Engineering in 2024.
Sethusamudram Shipping Canal Project
The Sethusamudram Shipping Canal Project, an Indian scheme studied since 1860, would link the Palk Strait with the Gulf of Mannar so ships could avoid circumnavigating Sri Lanka.