【摘要】：鋼筋混凝土板柱結(jié)構(gòu)起源于20世紀(jì)初美國和歐洲等地區(qū),并憑借其結(jié)構(gòu)形式簡潔、能降低建筑物層高、方便施工和良好的經(jīng)濟(jì)效益等特點(diǎn)廣泛于住宅、辦公樓及車庫等建筑當(dāng)中。在實(shí)際工程當(dāng)中,板柱結(jié)構(gòu)通常配合剪力墻使用以增加結(jié)構(gòu)的側(cè)向剛度和強(qiáng)度。但由于水平荷載作用及板柱結(jié)構(gòu)本身可能出現(xiàn)不等跨等因素的影響,板柱節(jié)點(diǎn)通常需要同時傳遞豎向荷載和不平衡彎矩而發(fā)生脆性的沖切破壞。正因如此,板柱節(jié)點(diǎn)的沖切破壞問題一直吸引著研究人員。本文采用重剪比以及配筋率兩個試驗(yàn)變量對7個偏載下板柱中節(jié)點(diǎn)的破壞過程進(jìn)行了對比試驗(yàn),獲取了板的荷載-撓度曲線及撓曲形狀、混凝土及鋼筋應(yīng)變、板底裂縫分布,以及開裂荷載、極限荷載等試驗(yàn)數(shù)據(jù),并在試驗(yàn)過程中采用特制應(yīng)變測桿對試件內(nèi)部斜裂縫的形成和發(fā)展予以監(jiān)測。試驗(yàn)結(jié)果表明:試件最終破壞形態(tài)受重剪比和配筋率兩因素共同影響;重剪比相同的試件,配筋率的提高可有效提高中柱節(jié)點(diǎn)對不平衡彎矩的承載力;板內(nèi)斜裂縫在節(jié)點(diǎn)發(fā)生沖切破壞之前已產(chǎn)生,由板體中部或中上部向近柱板域剪壓區(qū)和板底受拉區(qū)發(fā)展�；诒疚脑囼�(yàn)結(jié)果和歷史試驗(yàn)數(shù)據(jù),對比了舒兆發(fā)、Ying Tian、Kyoung-Kyu Choi及各國規(guī)范GB50010-2010、ACI318-11、Eurocode2-04所采用的方柱中節(jié)點(diǎn)沖切承載力計(jì)算公式的精準(zhǔn)程度。指出基于偏心剪應(yīng)力模型的中、美規(guī)范對臨界剪應(yīng)力計(jì)算的保守,以及對于節(jié)點(diǎn)失效的判定準(zhǔn)則不甚合理兩方面的原因造成了高重剪比數(shù)據(jù)群的離散。提出我國規(guī)范在計(jì)算不平衡彎矩分配系數(shù)0?時宜考慮重剪比的影響的建議,并據(jù)此對原公式進(jìn)行修正,修正后的規(guī)范公式計(jì)算精度有所提高。
[Abstract]:The reinforced concrete slab-column structure originated in America and Europe at the beginning of 20th century. With its simple structure form, it can reduce the height of buildings, facilitate construction and have good economic benefits and so on. Buildings such as office buildings and garages. In practical engineering, slabs and columns are usually used in conjunction with shear walls to increase the lateral stiffness and strength of the structure. However, due to the influence of horizontal load and the unequal span of slab-column structure, the flat-column joints usually need to transfer vertical load and unbalance moment at the same time, resulting in brittle punching failure. For this reason, the punching failure problem of slab-column joints has attracted researchers all the time. In this paper, the failure process of joints in slabs and columns under seven eccentric loads is tested by using the test variables of reshear ratio and reinforcement ratio. The load-deflection curves and deflection shapes, the strain of concrete and reinforcement, the distribution of cracks at the bottom of slabs are obtained. The crack load, limit load and other test data are also used to monitor the formation and development of the internal oblique crack in the specimen by using the specially made strain bar during the test. The test results show that the ultimate failure pattern of the specimens is affected by both the reshear ratio and the reinforcement ratio, and the increase of the reinforcement ratio of the specimens with the same reshear ratio can effectively improve the bearing capacity of the mid-column joints to the unbalanced bending moment. The oblique cracks in the plate are developed from the middle or upper part of the plate to the shear zone of the near column and the tensile zone of the bottom of the plate before the joint is damaged by punching. Based on the experimental results of this paper and the historical test data, the accuracy of the formulas for calculating the punching capacity of the joints in a square column used by Shu Zhaofa, Ying Tian,Kyoung-Kyu Choi and the national standard GB50010-2010,ACI318-11,Eurocode2-04 is compared. It is pointed out that in eccentricity shear stress model, the conservative method of American code for critical shear stress calculation and the unreasonable criterion for determining joint failure result in the discretization of data groups with high reshear ratio. It is proposed that the code of our country calculate the unbalance moment distribution coefficient 0? The suggestion of considering the influence of reshear ratio should be taken into account, and the original formula is modified accordingly, and the calculation precision of the modified standard formula is improved.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU375

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本文編號：2410873