非線形応答を考慮した屋内露出配管用メ力二カル継手の数値解析モデル

摘要

現在，呼び径100A以上の屋内露出ガス配管の接合方法は溶接が一般的である。一方，将来的に懸念される熟練した溶接工の不足等の事象への対応策のひとつとして，当該配管に対するメカ二カル継手の適用が効果的な手段となり得ると考えられる。その適用に当たっては，地簾時における安全性を確保するために，メカ二カル継手接合配管の耐廣性評価方法に関する知見を得ておく必要がある。%Two numerical models of a mechanical coupling for interior city-gas piping are constructed based on single-axis bending and shaking-table tests. First, a piping specimen model, which has a coupling modeled by a combination of a bilinear spring and an elastic spring with hardening characteristics, is constructed. Then, the other model is also constructed using a nonlinear hysteretic spring based on an Ozdemir model,alinear spring, and a gap-closing spring. Finally, time-history response analysis, which simulates shaking-table tests, is conducted using each model to investigate their reliability. The response of the second model shows a good agreement with the experimental results in the case of small response leveL