[Event Information]
Notice of the 2017rd Engineers Salon (ES) held in 2
This time, I would like to have a discussion with Mr. Yoshiaki Komatsu of the former Obayashi Corporation on the theme of "Quality Assurance of Buildings".
In recent years, there have been problems such as improper design in the sister tooth case and illegal construction problems in the Yokohama pile case regarding architectural design and construction.Looking back on these incidents, we will consider the quality assurance of buildings.At the same time, we raise concerns about the design of seismic isolated buildings, which are being adopted in the midst of a series of high-intensity earthquakes such as the Kumamoto earthquake.Please join us.
[2st Engineers Salon]
Date: May 2017, 7 (Wednesday) 12: 19-00: 21
Location: Tameike Sanno Office
Lecturer: Yoshiaki Komatsu (former Obayashi Corporation, former part-time lecturer at the Department of Architecture, Kokushikan University)
Theme: Quality Assurance of Buildings ――Lessons from the Incident and the Great Earthquake ――
Membership fee: 1,000 yen (including social gathering fee)
Capacity: About 10 people (including the secretariat)
[Implementation report]
Participation: 10 people (including lecturer)
This time, Mr. Yoshiaki Komatsu, a former part-time lecturer at the Department of Architecture, Kokushikan University, who is from Obayashi Corporation, provided a topic on the issue of quality assurance of buildings.He talked about the factors, contents and countermeasures of the sister tooth case and the Yokohama pile illegal construction case, which have attracted a great deal of attention as building-related ethical issues in recent years, as well as examples of house collapse caused by the Kumamoto earthquake that do not comply with the Building Standards Act. I did.
In addition, as a result of seismic isolation performance confirmation tests after long-term use, it was reported that sufficient reliability can be maintained for seismic isolated buildings, which have been increasingly adopted in the midst of a series of large earthquakes.On the other hand, it was pointed out that the current seismic isolation design standards may be inadequate, taking as an example the damage to a hospital in a seismic isolated building caused by the Kumamoto earthquake.In the sister tooth case, the design seismic intensity of the structural calculation was lowered and the reinforcing bars were unusually small, but the inspection side did not notice that the input was small for many years.Since I hadn't actually seen the contents of the application form, I thought that the ethics of the approver had to be questioned.However, when rebuilding, it seems that the national and local governments paid about 3% of the cost.In the case of piles in Yokohama, it seems that the length of piles cannot be determined without careful geological survey where the upper surface of the bedrock is slanted.If you excavate and say that it does not reach the bedrock, and if you lengthen the pile at that point, you may have hesitated because the process will be delayed and the cost will increase due to the arrangement of the reinforcing bars and concrete of the pile.
Many PEs for architecture and civil engineering also participated, and discussions on causes and countermeasures as familiar problems were very lively.
We will continue to hold engineer salons every two to three months, so we look forward to your participation.