ブックタイトル未来につなぐ人類の技17　煉瓦造建造物の保存と修復

概要

未来につなぐ人類の技17　煉瓦造建造物の保存と修復

ムをすべて想定し、単純な均衡性の検討を用いて破損メカニズムの抵抗を把握することが基本となります。解析方法（スライド26-28）アーチについても同じく極限解析が適用できます。ここでは、5キロ×5キロのグリッドの中で地震の強さを定めて、各地点におけるあらゆる再現期間に対して、基準法では地震の強さを最大加速度（maximum va）と応答スペクトルの形から定めています。地震動（action）の再現期間は、条件とする各極限状態（limit state）に応じて決定しています。これが一般的な安全性の捉え方です。耐震改修の方法（スライド29）これらが基準法の中で推奨される典型的なインターベンションの例です。最初が、接続部のProf. Eng. Claudio ModenaDefinition of seismic scale assumptionSM IngegneriaCURRENT HAZARD MAPN.T.C. 14/01/2008:The hazard maps is based on a reference designaction based on the geographical coordinates.For all the points in the country there are thoseparameters.The final design action is function of: limit state,building relevance and use (return period), soil andposition.Prof. Eng. Claudio ModenaInterventions - APPLICATIONSItalian Guidelines ?§6 ? Seismic Improvement and Intervention Techniques CriteriaSM IngegneriaThe guidelines analyse the following types of interventions, giving useful indications for the conception and thedesign of the intervention:1. Interventions to improve the connections (walls ? floors)2. Interventions to improve the behaviour of arches and vaults3. Interventions to reduce excessive floor deformability4. Interventions on the roof structures5. Interventions to strengthen the masonry walls6. Interventions on pillars and columns7. Interventions to improve connection of non-structural elements8. Interventions on the foundation structuresDownload: http://www.cslp.it/ > Home >Cosa facciamo > Novitaスライド26In the following slides some, examples of improving and strengthening interventions realised according withthe indications of the guidelines are showed.スライド29Prof. Eng. Claudio ModenaDefinition of seismic scale assumptionSM IngegneriaN.T.C. 14/01/2008:In detail is possible toobserve the series of thepoints given by the map.For the intermediate point ainterpolation is given.Prof. Eng. Claudio ModenaInterventions - APPLICATIONSInterventions to improve the connections (walls ? floors)Connections and dissipative systems with early warning:intervention techniques, testing, modelling and design proceduresSM Ingegneriahttp://esse1.mi.ingv.it/.スライド27スライド30Prof. Eng. Claudio ModenaDefinition of seismic scale assumptionSTEPS TO DEFINING ELASTIC RESPONSE SPECTRUMSM IngegneriaSteps to defining Elastic Response Spectrum S e (T 0 ):- identification of V N and C U of the building to calculate V R ;- definition of P VR , related to the considered LS, in order to evaluate the T r of the event tobe considered for design;- Place the building on the seismic hazard map;- Definition of the corresponding three parameters that define the spectral shape: a g , F 0 ,T C *STANDARD SPECTRAL CURVE S e (T 0 ) If reference grid of the seismic hazard map does notencompass fixed return period T R , the value of theB Cgeneric parameter (a g , F 0 , T C *) can be derived byMax amplification interpolation.Prof. Eng. Claudio ModenaInterventions - APPLICATIONSInterventions to improve the connections (walls ? floors)? Anchoring ties? Reinforcing rings? Floor/wallsconnectionsSM IngegneriaF 0a gAPeakGroundAccelerationBranch withConstantvelocityS vDBranch withConstantdisplacement S dFor any point in the map not falling in the nodes of thereference grid, the parameter values can be calculatedas a weighted average of the values in the fourvertices of the mesh containing the searched point, usingas weights the inverses of the distancesbetween vertices and the point itself. .Residential buildings,Montesanto (Sellano)Period T 0スライド28スライド3153