房建材料及制品_2023_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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房建材料及制品

基于ABAQUS的钢筋混凝土柱拟静力试验非线性分析

曹晓罗

2023年第1期

摘要

引用本文

摘要：为了研究ABAQUS在钢筋混凝土结构拟静力试验数值分析中的适用性，选取了美国太平洋地震工程研究中心结构性能数据库中的一根矩形截面钢筋混凝土柱（RC柱）的拟静力试验数据，在ABAQUS中分别采用实体单元和纤维梁单元两种方式对其在低周往复荷载下的抗震性能进行了数值模拟，并与试验结果进行了对比。结果表明：剪跨比不仅影响了RC柱的最终破坏形态，还会影响其抗侧刚度，且剪跨比越大，抗侧刚度越小；轴压比的增大会导致骨架曲线出现下降段，使RC柱的延性降低；混凝土强度对滞回曲线影响较小，纵筋配筋率的增大可有效提高RC柱的水平抗侧力。 Abstract: In order to study the applicability of ABAQUS in the numerical analysis of quasic-static test of reinforced concrete structure, the quasic-static test data of a rectangular reinforced concrete column (RC column) in the structural performance database of the Pacific Earthquake Engineering Research Center in the United States was selected, and the seismic performance of the column under low cyclic reciprocating loads was numerically simulated in ABAQUS by using solid element and fiber beam element respectively, and compared with the test results. The results show that the shear span ratio affects the ultimate failure mode of RC columns, and the greater the shear span ratio, the smaller the lateral stiffness. The increase of axial compression ratio will lead to the decrease of the skeleton curve, which will reduce the ductility of RC columns. The concrete strength has little effect on the hysteretic curve, and the increase of longitudinal reinforcement ratio can effectively improve the horizontal lateral bearing capacity of RC columns.

曹晓罗.基于ABAQUS的钢筋混凝土柱拟静力试验非线性分析[J].混凝土与水泥制品,2023(1):60-65. CAO X L.Quasic-static Nonlinear Test Analysis of Reinforced Concrete Columns Based on ABAQUS[J].China Concrete and Cement Products,2023(1):60-65.

丁苯橡胶泡沫混凝土的孔结构与宏观性能研究

伍怡璇，李静，黄子锐，欧阳启健，孙浩翔，呼浩楠

2023年第1期

摘要

引用本文

摘要：在聚灰比为0、1%、3%、5%的情况下，研究了丁苯橡胶对泡沫混凝土干密度和抗折、抗压强度的影响，并通过显微图像处理和SEM从孔结构角度分析了丁苯橡胶对泡沫混凝土的改性机理。结果表明：随着聚灰比的增加，泡沫混凝土的孔隙率和平均孔径均呈先增后减的趋势，孔隙圆度值略有降低，导致干密度和抗压强度均先减小后增大，抗折强度先略有降低后快速增大。 Abstract: The effects of styrene-butadiene rubber on the dry density, flexural strength and compressive strength of foamed concrete were studied when the polymer-cement ratio was 0, 1%, 3% and 5%, and the modification mechanism of styrene-butadiene rubber on foamed concrete was analyzed from the perspective of pore structure by microscopic image processing and SEM. The results show that with the increase of polymer-cement ratio, the porosity and average pore size of foamed concrete increase first and then decrease, and the porosity roundness value decreases slightly, resulting in the dry density and compressive strength decrease first and then increase, and the flexural strength decreases slightly first and then increases rapidly.

伍怡璇,李静,黄子锐,等.丁苯橡胶泡沫混凝土的孔结构与宏观性能研究[J].混凝土与水泥制品,2023(1):66-69,73. WU Y X,LI J,HUANG Z R,et al.Study on Pore Structure and Macro-properties of Styrene-butadiene Rubber Foamed Concrete[J].China Concrete and Cement Products,2023(1):66-69,73.

可再分散乳胶粉对石膏基自流平砂浆性能的影响

聂宗浩1，岳雪涛1，夏芙蓉1，于成鑫1，闫浩康2，刘诚诚3

2023年第1期

摘要

引用本文

摘要：以脱硫石膏为主要胶凝材料，掺入普通硅酸盐水泥和外加剂，制备了石膏基自流平砂浆，研究了不同掺量（0、1%、2%、3%、4%）的可再分散乳胶粉对石膏基自流平砂浆工作性、力学性能和耐水性能的影响，并采用XRD和SEM进行了微观分析。结果表明：掺入适量的可再分散乳胶粉能够提高石膏基自流平砂浆的流动度；可再分散乳胶粉的掺入降低了石膏基自流平砂浆的抗压强度、抗折强度和耐水性能，同时降低了压折比，从而提高了石膏基自流平砂浆的韧性和抗裂性，降低了脆性；石膏基自流平砂浆的水化产物主要为二水石膏、钙矾石等。 Abstract: Using desulfurization gypsum as the main cementitious material, mixed with ordinary silicate cement and admixtures, the gypsum-based self-leveling mortar was prepared. The effects of different contents(0, 1%, 2%, 3%, 4%) of redispersible latex powder on the workability, mechanical properties and water resistance of gypsum-based self-leveling mortar were studied, and the microscopic analysis was carried out by XRD and SEM. The results show that adding appropriate content of redispersible latex powder can improve the fluidity of gypsum-based self-leveling mortar. The addition of redispersible latex powder reduces the compressive strength, flexural strength and water resistance of gypsum-based self-leveling mortar, and reduces the compression flexural ratio, thereby improving the toughness and crack resistance of gypsum-based self-leveling mortar and reducing brittleness. The hydration products of gypsum-based self-leveling mortar are gypsum dihydrate, ettringite and so on.

聂宗浩,岳雪涛,夏芙蓉,等.可再分散乳胶粉对石膏基自流平砂浆性能的影响[J].混凝土与水泥制品,2023(1):70-73. NIE Z H,YUE X T,XIA F R,et al.Effect of Redispersible Latex Powder on Properties of Gypsum-based Self-leveling Mortar YU Cheng-xin, YAN Hao-kang, LIU Cheng-cheng[J].China Concrete and Cement Products,2023(1):70-73.

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