Prestressed composite laminates featuring interlaminar imperfection

The third-order zigzag displacement model is improved to include inplane displacement jumps across each layer interface of composite laminates to enable interlaminar imperfection to be incorporated. The imperfection is characterized by a linear spring-layer model which includes perfect bonding as a special case. The principle of virtual work is used to derive a boundary value formulation for laminated composite plates initially in a prestress state. Bending, buckling and vibration problems are studied for the case of rectangular cross-ply laminated plates for illustrative purpose.     

2m厚转换板混凝土施工裂缝控制技术

南京市娄子巷小区四期高层住宅工程中有两块 2m厚预应力混凝土转换板 ,本文介绍了该厚板施工中混凝土裂缝控制技术     

钢筋混凝土预应力管桩承载力确定及完整性检测

桩基承载力和完整性直接影响建筑物的正常使用功能和使用寿命,准确确定桩基的承载力和完整性对建筑物的施工具有重要作用。检测中,以建筑基桩检测技术规范和建筑地基基础检测技术规范为依据,通过现场静载试验、高应变和低应变试验对钢筋混凝土预应力管桩的承载力和完整性进行检测,得出以下结论:单桩竖向极限承载力均大于1400kN,所检测的各单桩极限承载力均能满足设计要求。预应力混凝土管桩施工质量易于控制,Ⅰ类桩占比为100%,无Ⅱ、Ⅲ、Ⅳ类桩。     

清水河大桥墩梁结合部施工技术

结合南昆铁路清水河大桥墩梁结合部施工实例,介绍了其０号段托架、支架、内外模板体系的设计与施工,预应力粗钢筋、非预应力筋整体吊装、大体积混凝土整体一次灌注等技术。     

无粘结预应力混凝土蛋形消化池施工

杭州市四堡污水处理厂扩建工程有３ 座１０９２６ｍ ３ 无粘结预应力混凝土蛋形消化池,本文介绍其非预应力钢筋、模板体系、混凝土和预应力工程等结构施工成套技术     

贵阳第二长途电信枢纽楼预应力楼盖设计与施工

介绍高效预应力混凝土技术在贵阳第二长途电信枢纽工程１２ｍ 跨楼盖设计和施工中的应用,针对该工程采用外筒内框的结构形式,详细介绍了无粘结预应力的主要施工工艺。     

预应力混凝土转换梁结构设计与施工

由于转换梁结构的特殊性 ,在其设计和施工过程中的一些做法有别于常规结构。结合实际工程 ,对预应力混凝土转换梁结构设计和施工过程中的一些问题作了讨论 ,为其它类似工程提供了参考。     

The cross-section warping effect with the associated creep-induced deformations

The modern bridge girders are of plated character for which the beamtype analysis is inadequate. This is why the three-dimensional approach applying advanced computational analyses must be used to obtain the true 3D structural performance. The paper is directed to the cross section warping effect and to the warping induced long term prestressing loss due to creep of concrete. It is shown that the severity of cross section warping is of fundamental importance, particularly in the case of unevenly distributed and isolated tendons in cross-section and in the case of short spans. Thus it will be appropriate to introduce a new component of the prestress loss – the prestress loss due to creep of concrete induced by cross section warping.     

恰希玛核电站安全壳预应力孔道灌浆

介绍在高温环境下,为保证核电站安全壳预应力孔道灌浆施工的质量,所进行的室内浆体配合比试验、接收试验和全比例模拟试验,以及孔道灌浆施工的工艺流程。     

信达金融大厦无粘结预应力墙梁的设计与施工

信达金融大厦外墙自５ 层以上采用无粘结预应力混凝土刚性墙梁,结构形式特殊。本文介绍大跨度无粘结预应力梁的设计、施工难点,张拉、测试等,并根据测试结果进行了分析和探讨。