ANALYTICAL MODEL OF RC WALL WITH AN OPENING USED IN STRUCTURAL DESIGN

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  • KATO Daisuke
    Dept. of Architecture, Faculty of Engineering, Niigata University
  • SHIRAISHI Mei
    Graduate School of Science and Technology, Niigata University
  • NAKAMURA Takaya
    Dept. of Architecture, Faculty of Engineering, Niigata University

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  • 構造設計で用いるRC造有開口耐震壁の解析モデル
  • コウゾウ セッケイ デ モチイル RCズクリユウカイコウ タイシンヘキ ノ カイセキ モデル

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Abstract

<p> 1. INTRODUCTION</p><p> In current design procedures analytical models of walls with openings are chosen according to the peripheral ratio of the walls, i.e. wall models are used for walls with peripheral ratio of less than 0.4 whereas frame models are used for walls with that of more than 0.4. For a long time the problem of the discontinuity about peripheral ratio of 0.4 has been pointed out and recently the necessity of common models irrelevant with peripheral ratio has been emphasized. In this report analytical results by 4 analytical models for walls with an opening are compared with experimental data and the feasibility of these models are discussed.</p><p> 2. ANALYSIS OBJECTS</p><p> The analysis objects are 12 reinforced concrete cantilever walls with an opening failing in flexure and accompanying 2 walls without openings. The range of the peripheral ratios of those wall specimens are from 0.2 to 0.44 and 7 wall specimens are eccentrically perforated. The behaviors of eccentrically perforated walls depend on the loading direction so these 7 specimens are counted 14 specimens for data plotting.</p><p> 3. ANALYTICAL MODEL</p><p> Following 4 analytical models are examined.</p><p> (1) Linear element model with discrete fiber springs : In this model a wall is replaced by linear elements representing vertical and horizontal members on both sides of the opening. Each linear element is composed by multi discrete fiber springs. Axial force – moment interactions of the fiber spring can be considered automatically.</p><p> (2) Three columns model : This model is popularly used for walls with peripheral ratios of less than 0.4 in the current design procedures. A wall is replace by three column elements. The effects of openings can be considered for only shear strength and the position of the opening cannot be considered.</p><p> (3) Linear element model with flexural springs at both ends : This model is mainly used for bare frames without wall panels. However for perforated walls with peripheral ratio of more than 0.4 this model is helplessly used without enough examination of the feasibility.</p><p> (4) Divided three columns model : In this model a wall is replaced by surrounding members representing vertical and horizontal members on both sides of the opening. Each surrounding member is replaced by three columns model shown before.</p><p> 4. CONCLUSION</p><p> (1) Regarding maximum strength the linear element model with discrete fiber springs and the divided three columns model can simulate the test results reflecting the differences of size and position of openings. The three columns model cannot simulate the differences of position of the opening although it can roughly simulate the maximum strength. The gaps of strength between test results and analytical results by the linear element model with flexural springs at both ends are large.</p><p> (2) Regarding deformation mechanism the linear element model with discrete fiber springs and the divided three columns model can roughly simulate the test results.</p>

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