【摘要】：為研究高溫后高強(qiáng)混凝土的剪切裂縫和拉剪箍筋銷栓作用,澆筑了兩種強(qiáng)度高強(qiáng)混凝土Z形試件.分別對(duì)試件進(jìn)行了200,400,800°C的高溫試驗(yàn),通過(guò)高溫后試件的直剪試驗(yàn),研究了溫度和混凝土強(qiáng)度對(duì)剪切裂縫的影響.基于彈性地基梁理論建立了箍筋銷栓作用模型,結(jié)合實(shí)測(cè)的剪切裂縫寬度和裂縫滑移,計(jì)算得到高溫后高強(qiáng)混凝土與箍筋之間的銷栓剪應(yīng)力.研究結(jié)果表明:除200°C以外,高強(qiáng)混凝土的裂縫峰值位移(裂縫峰值寬度和裂縫峰值滑移)隨溫度的升高而增大;無(wú)論經(jīng)歷多高的溫度,混凝土的強(qiáng)度越高,裂縫峰值位移越小;箍筋的銷栓剪切應(yīng)力與裂縫滑移呈線性關(guān)系,銷栓剪切剛度隨溫度的升高而降低,隨混凝土強(qiáng)度的增大而增大;銷栓剪切應(yīng)力隨溫度的升高而增大,隨混凝土強(qiáng)度增大而減小.
[Abstract]:In order to study the shear crack of high-strength concrete after high temperature and the action of tension-shear hoop reinforcement pin bolt, two Z-shaped specimens of high-strength concrete were poured. The specimens were tested at high temperature at 200400800 擄C, and the effects of temperature and concrete strength on the shear cracks were studied by direct shear test after high temperature. Based on the elastic foundation beam theory, the pin action model of hoop reinforcement is established. Combined with the measured shear crack width and crack slip, the pin shear stress between high strength concrete and stirrups after high temperature is calculated. The results show that except 200 擄C, the crack peak displacement (crack peak width and crack peak slip) of high strength concrete increases with the increase of temperature, no matter how high the temperature is, the higher the strength of concrete is, the smaller the peak displacement of crack is. There is a linear relationship between pin shear stress and crack slip of stirrups, the shear stiffness of pin decreases with the increase of temperature and increases with the increase of concrete strength, and the shear stress of pin increases with the increase of temperature and decreases with the increase of concrete strength.
【作者單位】： 同濟(jì)大學(xué)土木工程學(xué)院;同濟(jì)大學(xué)土木工程防災(zāi)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家“九七三”重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(2012CB719703)
【分類號(hào)】：TU528

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