本研究では、複層のライズの低い平板状屋根を有し，下部構造を耐震壁付RC造とした鉄骨置屋根体育館を対象として，下部構造も含めた構造全体の設計用地震荷重の近似的算出手法を提案しています。本研究は東工大（現科学大），工学院大学，明治大学，防災科研の共同研究（基盤A）の一部であり，山下哲郎先生の研究グループの成果です。論文はこちら

During major earthquakes, many damages were reported to RC gymnasiums with steel roofs. Previous studies have proposed methods to control the out-of-plane response, which is the main cause of damage. However, a method for calculating the design seismic loads that considers the vibration characteristics of the entire structure, including the out-of-plane response, has not yet been proposed. Therefore, in this paper, we propose a method to calculate the design seismic loads for RC gymnasiums with steel roofs by the response spectrum analysis using ground acceleration.

　本研究では，鉄骨置屋根体育館の各種諸元がRC 片持架構 の構面外応答制御と上述の評価法の適用性に与える影響を数値解析的に検証し，RC片持架構スパン，屋根半開角，屋根面内剛性， 摩擦ダンパー支承配置がRC 片持架構の構面外応答と評価法の適用性に与える影響を分析する。さらに正確なRCの復元力特性を考慮した数値解析結果と評価法を比較検証し，摩擦ダンパー導入時の柱脚曲げモーメントの評価法を修正する。論部はこちら

This paper investigates the effect of the span of cantilevered RC wall, the in-plane stiffness of the roof, the layout of friction damper support on both the response control of cantilevered RC walls in RC gymnasiums with metal spatial roofs and the proposed response evaluation method. According to the response history analysis results, the proposed method was proved to be available on various RC gymnasiums and the evaluation formula of the column base moment of the cantilevered RC walls was modified following the appropriate moment diagram.

　本研究では、屋根構造の回転剛性の低いスライド支承部の繰り返し加力実験を行い、それらの結果をもとに破壊メカニズムの解明、および回転と水平移動を考慮した骨格曲線の定式化を試みました。本研究は東工大（現科学大），工学院大学，明治大学，防災科研の共同研究成果（基盤A）の一部であり，山下哲郎先生（工学院大学）が長年行われている屋根支承部の復元力特性の定式化の集大成です。論部はこちら

In 2011, many roof bearings in large span facilities were damaged severely by the Pacific coast of Tohoku earthquake. Some of them were designed as slide bearings to release the thrust caused by the weight of roof. In ball-jointed system truss roof, bearings are subjected to horizontal movement and rotation since the roof structure has insufficient bending stiffness. In this study, we conducted the cyclic loading tests on conventional roof bearings and analyzed the observed behavior. In addition, we derived functions which express horizontal force in relation to horizontal displacement and rotation and verified by comparing with the test results.

　本研究は鉄骨置屋根体育館に関する一連の研究をレビューするとともに，2016年の熊本地震で被災したA体育館のアリーナ床レベルより上のRC 片持架構1スパンと立体トラス屋根を抽出した1/2.5縮小部分模型を用いた振動台実験の結果を解説しています。本研究は東工大（現科学大），防災科研，工学院大学，明治大学の共同研究の成果です。論文はこちら

The transverse out-of-plane response of the RC moment frame on the arena floor damaged a school gymnasium that was expected to function as a natural disaster shelter. It was composed of heavy RC substructure and a light steel roof, which partially collapsed, resulting in the facility’s permanent destruction in the 2016 Kumamoto earthquake. This study describes scaled shaking table tests that simulate out-of-plane response-induced damage to the RC moment frame of the school gymnasium during the 2016 Kumamoto earthquake and verifies the damage mechanism proposed by the previous numerical simulation and the efficiency of a response control by the friction damper support. Furthermore, the study validates two methods for evaluating the response of the RC moment frame and the overall buckling strength of the roof truss member with semi-rigid joints.

　本研究は回転拘束度と接合部回転剛性を考慮したシステムトラス部材の全体座屈耐力評価法を提案しました。この研究は鉄骨置屋根体育館の耐震性能に関する研究シリーズの１つであり，防災科学技術研究所，工学院大学，日鉄エンジニアリングと共同で実施した振動台実験を一部引用しています。本手法はシステムトラス屋根の非線形解析を行う方に向けた内容であり，市販の立体解析プログラム上で履歴を設定するために必要な手続きや後処理的に行う疲労破壊の評価についても簡単に紹介しています。今まで地震被害を再現するような非線形解析では，屋根部材の許容応力度は経験的に決定してきましたが，今回の提案によってある程度根拠を持って一義的に決定できるようになりました。論文はこちら

A member global buckling strength estimation of spatial truss roof with semi-rigid joints is proposed according to both the results of the connection bending tests of spatial roof truss joints. The proposed estimation method is introduced to a parameter formulation for the phenomenological constitutive model simulating yield strength increment by cold-forming, post-buckling behavior and post-buckling ductile fracture. The accuracy is validated against static unit-truss element test and dynamic shaking-table test, including truss member buckling and member fracture..

　本研究では，摩擦ダンパーを含む滑り支承で鉄骨造屋根に接続されるRC片持架構の構面外応答制御設計法を提案しました。本研究は置屋根体育館の耐震性能に関する研究シリーズの一つで、防災科研，東工大，工学院大学，日鉄エンジニアリングとの共同で行った振動台実験を引用しています。卒業論文の提案から設計法の完成まで8年もかかるとは思っていませんでした。この設計法の提案は先輩、後輩、教え子など多くの方々との長年の試行錯誤の末に到達した成果です。関係する皆様に深くお礼申し上げます。論文はこちら

In steel roof gymnasiums with RC substructures, out-of-plane response of cantilevered RC walls are predominant during seismic responses, which triggers sequential damages of structural or non-structural components. Detailed regulations have been not included in the current Japanese building code yet even though Gymnasium is used as a shelter in disaster. In this paper, a design procedure for out-of-plane response control of a cantilevered RC wall connected by roller supports to metal spatial roof was proposed. While many researchers proposed response evaluation methods for cantilevered RC walls, those methods are too complicated to be implemented in the actual design process. Therefore, the proposed design procedure is carefully formulated based on Japanese structural engineer’s practice. The design equation is derived from both equivalent linear approach simulating damping effect and continuum mechanics where a cantilevered RC wall is modeled as single beam or single plate.

　本研究は置屋根体育館の耐震性能について各種の設計法で設計した場合の耐震性能を比較しています。論文はこちら

In steel roof gymnasiums with RC substructures, space frame roof members are damaged by out-of-plane response of Cantilevered RC walls and vertical response of roof. In this paper, numerical analysis models are constructed for two gymnasiums that have suffered damage such as buckling, post-buckling fracture and fallings of truss members in the 2016 Kumamoto earthquake. For the roofs, bearings, and RC substructures, various design methods such as the old design method, the current design method, and the design method using the guidelines are applied. The seismic response of each model is analyzed by time history response analysis, and the damage of the truss members is evaluated.

　本研究では，2016年の熊本地震で被災した2 棟のシステムトラス 屋根を有する鉄骨置屋根体育館について，支承部のルーズホール長や屋根部材の座屈と破断を模擬する3 次元数値解析モデルを構築し， RC 片持架構，屋根支承部，システムトラス部材の詳細な地震応答性状を追跡し，実際の被害報告との比較分析から鉄骨置屋根体育館のシステムトラス屋根が損傷したメカニズムの解明を試みました。この研究から鉄骨置屋根体育館のテーマに正式に復帰し，関係する検討は2023年まで続いていくことになりました。このページの動画は栃木県の科学館の展示用に無償で提供したものです。子供向けだったので，ふりがなをつけたり，表示上の変形倍率をやや大きくしています。論文はこちら

　Large numbers of structural and non-structural components in steel roof gymnasiums with RC substructures were damaged in the past earthquakes. Particularly in 2016 Kumamoto earthquake, structural component in some space frame roofs experienced serious damages including buckling, post-buckling fracture and fallings, which could have caused serious human damages. This paper presents the damage mechanism of space frame roofs with the effects of cantilevered RC walls based on numerical simulations of member-by-member models considering member buckling and fractures. The numerical simulation results were analyzed by comparison with the actual damages.

　本研究では，側面壁面外剛性および屋根ライズを変化させた解析モデルを作成し屋根ライズの影響をともなう梁間方向に着目した屋根面の応答増幅および各種支承部の応答を分析しました。また，RC片持架構の構面外応答が屋根面の応答と連成する影響を考慮し，既往の評価手法を拡張する形で屋根面の応答加速度並びに支承部反力の評価手法の誘導を試みました。当時の竹内徹研究室には，異常に優秀な人材が集結していましたが，一方で誰に使ってもらうのか全く意識していない難解な評価モデルを競うように量産しており，後輩・学生に力任せに研究すれば良いというものではないと説いていましたが，当時は分かってもらえませんでした。論文はこちら

Numerous steel roof bearings in RC gymnasia were damaged at the 2011 Tohoku and 2016 Kumamoto Earthquake, mainly due to out-of-plane response of cantilevered RC walls. Although the authors confirmed the reduction effect for seismic response of cantilevered RC walls by friction damper bearings, the transverse response evaluation methods including the roof response are not established. In this paper, using the experimental results of a PTFE sliding bearing, a friction damper bearing, and a rubber sheet bearing, the transverse response of RC walls are analyzed by numerical simulations including effects of the roof response, followed by proposing the evaluation methods.

　本研究では梁間方向を含む鉄骨置屋根支承部の応答評価を最終目的とし，まずモルタル厚さ60mmを有するPTFE滑り支承，摩擦ダ ンパー支承，厚さ60mmのゴムシート支承を実際に製作し，動的載荷実験を実施してその履歴特性を確認し，次に得られた復元力特性を用いて同支承を学校体育館規模の支持架構付き円筒ラチスシェルに挿入した解析モデルを構築し，各支承部が支承部応答反力や支承部 応答変形に与える影響を確認しました。摩擦ダンパー支承実験の第二弾です。論文はこちら

Numerous steel roof bearings in RC gymnasia were damaged at the 2011 Tohoku and 2016 Kumamoto Earthquake, mainly due to the out-of-plane response of cantilevered RC walls. Although the authors confirmed the longitudinal response reduction effect of the cantilevered RC walls by friction damper bearings, the transverse response was not examined. In this paper, dynamic loading tests of a sliding bearing with PTFE sheets, a friction damper bearing, and a rubber sheet bearing are conducted. The response of the RC walls in the longitudinal and traverse direction is calculated by numerical simulation using bearing hysteresis loops constituted by test results.