水泥混凝土制品_2021_《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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水泥混凝土制品

预制混凝土劲性复合桩地基设计及有限元分析

王亭1，曹阳2，李建立3，张志红4

2021年第12期

摘要

引用本文

摘要：以夹砂层地质为研究背景，结合工程实例，采用规范计算、现场载荷试验及ANSYS有限元分析方法，对预制混凝土劲性复合桩（PPRC劲性复合桩）地基进行了设计计算，并将结果进行了分析比较。结果表明，PPRC劲性复合桩单桩抗压承载力试验值与有限元分析结果较相近，且大于承载力设计值，PPRC劲性复合桩承载力特征值满足设计要求；通过与水泥粉煤灰碎石桩（CFG桩）对比可知，PPRC劲性复合桩经济优势明显，具有较好的推广前景。 Abstract： Take the geology of site mezzanine layer as the background of the study and combine with the engineering examples, theoretical calculationsthe, static load tests and ANSYS finite element analysis were used to design iso-core PPRC strength composite pile. The results show that the test value of the single-pile pressure-resistant carrying capacity of the strength composite pile is similar to the analysis value of finite element，and greater than the carrying capacity design value. The composite foundation carrying feature value meets the design requirements. Through comparison and analysis with CFG pile composite foundation, it is found that the economic advantages of the PPRC strength composite pile composite foundation are obvious and have good prospects for popularization.

王亭,曹阳,李建立,等.预制混凝土劲性复合桩地基设计及有限元分析[J].混凝土与水泥制品,2021(12):42-44,49. WANG T,CAO Y,LI J L,et al.Design and Finite Element Analysis on Foundation of PPRC Strength Composite Piles[J].China Concrete and Cement Products,2021(12):42-44,49.

环形超高性能混凝土制品离心成型试验研究

黄福云1，桂奎1，林潮2，黄伟1，马宇1，杨芳芳1

2021年第12期

摘要

引用本文

摘要：为改善环形UHPC制品离心成型质量问题，试验研究了水胶比、钢纤维掺量、减水剂、骨料掺量等因素对环形UHPC制品离心成型质量的影响。试验室研究结果表明：单掺细骨料UHPC制品随着水胶比的增大，其壁厚不均匀度也随之增大，制品离心成型难度也越大；双掺细骨料UHPC制品随着水胶比的增大，其壁厚不均匀度基本呈现先减小后增大的趋势；适宜双掺细骨料UHPC制品离心成型的水胶比范围比单掺细骨料UHPC制品的大；减水剂用量宜为1.2%~1.5%，当减水剂用量超过2.0%时，制品无法成型；含粗骨料UHPC制品的水胶比范围宜为0.16~0.17，钢纤维掺量与粗骨料体积含量呈反比关系，骨料的掺加能防止钢纤维“跑偏”，减少钢纤维集中分布在最外层现象的发生；采用离心成型工艺，单掺细骨料UHPC制品的混凝土坍落度宜控制在90~150 mm，双掺细骨料UHPC制品的混凝土坍落度宜控制在120~180 mm。 Abstract： In order to improve the insufficient centrifugal forming of UHPC pipe structure, the test parameters include water binder ratio, steel fiber content, water reducing agent, aggregate content, etc. on the experimental study of UHPC circular products by cemtrifugal forming were carried out. The results show that with the increase of water-binder ratio, the wall thickness unevenness of single mixed fine aggregate UHPC products increases, and the products are more difficult to centrifugal molding. With the increase of water-binder ratio, the wall thickness of double mixed fine aggregate UHPC products basically shows a trend of decreasing first and then increasing, and the range of water-binder ratio of double mixed fine aggregate UHPC products is larger. The dosage of water reducing agent should be 1.2%~1.5%. When the dosage exceeds 2.0%, the products are not formed. The recommended water-binder ratio should be 0.16~0.17, the volume content of steel fiber and coarse aggregate is inversely proportional, in order to prevent the deviation of steel fiber and reduce the phenomenon of steel fiber concentrated in the outermost layer, the slump range of single mixed fine aggregate UHPC products is 90~150 mm and the double mixed fine aggregate UHPC products is 120~180 mm.

黄福云,桂奎,林潮,等.环形超高性能混凝土制品离心成型试验研究[J].混凝土与水泥制品,2021(12):34-41. HUANG F Y,GUI K,LIN C,et al.Experimental Study on Circular Ultra-high Performance Concrete Products Using Centrifugal Forming[J].China Concrete and Cement Products,2021(12):34-41.

预应力钢筒混凝土管极限内压与损伤机理研究

李海珍1，冯新1，张宽1，刘贤良2

2021年第12期

摘要

引用本文

摘要：通过建立运行期管线及其周围土体的非线性有限元模型，研究了预应力钢筒混凝土管（PCCP）在极限内压荷载下的损伤演化规律。结果表明：管线在工作压力及设计压力荷载下均可安全运行；随内水压力的进一步增加，管芯由受压转变为受拉状态，进而出现（微）裂缝损伤，且材料损伤先在管芯内侧出现，管芯损伤后钢筒应力迅速增加直至达到其屈服强度，达到弹性极限状态；在极限内压下埋地管线内外层材料失效位置不同，但材料损伤均由插口端向管体中部延伸。研究成果可为遭受水锤作用PCCP管线的损伤评价提供参考。 Abstract: The nonlinear finite element model of pipeline was established including its surrounding soil, then the material damage and damage mechanism of the pipeline under the limit internal pressure load were analyzed. The results show that the pipe can operate safely under the working internal pressure and the design pressure in both cases. With increasing of internal water pressure, the concrete core transforms into tension state, and then (micro) crack damage in inner side occurrs first. Due to the material damage of the pipe core, the stress of the steel cylinder increases rapidly until it reaches its yield strength. The damage position of each material is different under the combined loads, however, the damage is both extended from the spigot end to the middle of the pipe. The finding can provide a reference and suggestions for damage assessment of in-service PCCP.

李海珍,冯新,张宽,等.预应力钢筒混凝土管极限内压与损伤机理研究[J].混凝土与水泥制品,2021(12):29-33,41. LI H Z,FENG X,ZHANG K,et al.Investigation on Ultimate Internal Pressure and Damage Mechanism of PCCP[J].China Concrete and Cement Products,2021(12):29-33,41.

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