为了研究BFRP布用量对混凝土短柱轴心抗压性能的影响,进行了单向轴心抗压试验和数值模拟研究。研究结果表明,随着BFRP布用量的增加,混凝土短柱的轴心抗压强度均有不同程度提高;采用ANSYS有限元分析软件能较好地模拟BFRP布约束混凝土短柱的轴心抗压强度。

In order to study the affection of the amount of BFRP sheets on the axial compressive strength of confined concrete short column, the uniaxial compressive test and numerical simulation are carried out. The results indicate that with increasing of the amount of BFRP sheets, the axial compressive strength of confined concrete short columns increase in different degree. And the axial compressive strength of confined concrete short column can be well simulated by using ANSYS finite element analysis software.

再生混凝土自保温承重砌块具有经济、环保、节能、高强及隔声等优点。通过对36个再生混凝土砌块砌体进行轴心抗压试验,研究其受压破坏特征及受压性能。试验分析得出其抗压强度设计值略低于规范中混凝土多孔砖砌体的抗压强度设计值;给出了适用于再生混凝土砌块砌体的抗压强度平均值建议公式、砌体受压应力-应变曲线建议公式、弹性模量及泊松比的建议取值。此外,采用块体与砂浆分开建模的分离式模型进行砌体轴心抗压弹塑性有限元分析,结果表明,砌体轴心受压有限元模型可以较精确地模拟砌体结构的受压行为,且具有一定的分析精度。

Recycled concrete self-insulation load-bearing block has the advantages of economy , environmental protection, energy saving, high strength and sound insulation.Based on 36 recycled concrete block masonries axial resisting compression tests , it was studied their compression failure characteristics and compression performance . Experimental results showed that the compressive strength of recycled block masonry was slightly lower than that of common block masonry .It was also given the suggested formula applicable to average compressive strength of recycled concrete block masonry , the suggested formula of compression stress-strain curve and the suggested values of elastic modulus and Poisson ratio .Article uses separated models of block masonry and mortar for elastic-plastic finite element analysis.The results show that the finite element model of axial compressive masonry can accurately simulate the compression behavior of masonry structures , which has a certain analytical precision

针对珊瑚混凝土强度低和氯盐含量高的缺点,研究了碳纤维掺量为0 kg/m3和2 kg/m3,水灰比分别为0.33、0.4和0.47的碳纤维珊瑚混凝土在龄期为3、7、14、21、28 d时的立方体抗压强度、轴心抗压强度、弹性模量和劈裂抗拉强度。试验结果表明碳纤维的添加对碳纤维珊瑚混凝土的弹性模量和劈裂抗拉强度均有一定幅度的提高,对立方体抗压强度和轴心抗压强度的影响不大;碳纤维珊瑚混凝土破坏时,碳纤维的强度未充分发挥;水灰比对碳纤维珊瑚混凝土的各项力学性能影响很大,0.4的水灰比为碳纤维珊瑚混凝土的最优水灰比。

To the question about the low-strength and high content of chlorine salt of coral concrete ,it studied the cube compressive strength、prism axial compressive strength、elastic modulus and tensile splitting strength aged 3、7、14、21、28 d respectively of carbon fiber coral concrete,the content of carbon fiber was 0 kg/m3 and 2 kg/m3 and the water-cement ratio was 0.33、0.40 and 0.47 respectively.The test results showed that the addition of carbon fiber can make the elastic modulus and tensile splitting strength improved a certain ex-tent,but it did not affect largely on cube compressive strength and prism axial compressive strength;When the carbon fiber coral concrete damage,the strength of the carbon fiber not gave full play;the water-cement ratio has a strong influence on the mechanical properties of carbon fiber coral concrete,the optimum ratio was 0.4.

研究方形薄壁型钢管/多层竹胶板组合空芯柱(Square,thin-walled steel tube/multi-layered bamboo plywood composite hollow column,SBCC)的轴心抗压性能,揭示其受力破坏机理,为其工程应用提供试验和理论基础。考虑试件的截面尺寸、空心率及长细比对SBCC抗压承载力的影响,设计制作了15根轴心抗压试件,通过SBCC的抗压性能测试,考察测试过程中的破坏形态和变形特征,分析各因素对试件轴心抗压力学性能的影响规律。试验结果表明:SBCC轴心抗压失效主要有竹胶合板材料破坏、基体胶结面开胶破坏以及整体失稳破坏3种形态,总体上胶结面间的胶粘强度及长细比是决定破坏模式的主要因素。SBCC的轴心抗压承载力随组合柱竹净截面面积、空心率的增大而显著提高,随长细比的增大而降低。通过试验数据的非线性回归分析,建立了SBCC的轴心抗压承载力计算公式,公式估算结果与试验测试结果的误差在20%以内。该研究结果表明SBCC是一种轴心抗压性能较优异的钢/竹组合结构单元,可实现"以竹代木",作为工程结构用材的应用前景广阔。

The development of laminated-bamboo has broadened the application range of bamboo material in the field of structural engineering. A new type of steel/laminated bamboo composite column was developed based on the existing bamboo composite element for constructing multi-story, pre-fabricated, column-supported, and bamboo-framed buildings, and named as square thin-walled steel tube/multi-layered bamboo plywood composite hollow column (SBCC). The core of the SBCC is a square thin-walled steel tube, and the exterior column consists of several high-strength bamboo plywood pieces (such as bamboo mat plywood) that are bonded together using a structural adhesive to form a composite hollow column. SBCCs are a new type of steel/bamboo composite with excellent physical and mechanical properties. Multi-layered high-strength bamboo plywood forms the primary body in the SBCC that is subjected to compressive forces, and the square thin-walled steel tube only serves as a liner. Large numbers of bamboo

为研究石英岩煤矸石人工砂替代河砂配制砌筑砂浆的可行性．对陕北某煤矿所排出石英岩煤矸石破碎制得人工砂替代河砂配制砌筑砂浆的拌合物性能和力学性能进行试验研究。研究结果表明，煤矸石破碎过程中产生的细粉可以作为惰性填料掺入砂浆；掺入水泥用量20％的煤矸石细粉可改善砂浆拌合物和易性，同时可提高砂浆的立方体抗压强度和轴心抗压强度；用50％石英岩煤矸石人工砂替代河砂时，砂浆分层度最小．70％替代河砂时轴心抗压强度和弹性模量均达到最小值。

The workability and mechanical behaviors of the mortar prepared with artificial sand made by breaking quartzite gangue from coal mine in Northern of Shaanxi is studied in order to investigate the feasibility of masonry mortar prepared with quartzite gangue (artificial sand) broken to replace the river sand. The study shows that the coal gangue powder produced by the fragmentation technology can be added into the mortar as insert filler; the workability of the fresh mortar can be improved by mixing with coal gangue powder at 20% of the cement content, while the compressive strength and axial compressive strength of the cube specimens are also increased. The coursing degree of mortar is minimum when 50% of the quartzite gangue replaces river sand, and the axial compressive strength and elastic modulus of the specimens can be minimum value when the replacement ratio of the quartzite gangue is 70%.