徐变

悬灌施工PC弯桥梁考虑混凝土徐变增量的线型控制计算

Calculation of geometric control in consideration of concrete creep for cantilever construction of PC curved bridge

如何基于ANSYS软件平台进行考虑温度影响效应的混凝土结构早期温度徐变应力场的计算。

How to calculate thermal creep stress filed of early-age concrete considering temperature effect by ANSYS software .

并考虑混凝土的内外约束及混凝土的徐变变形，用有限元法求解混凝土不利面的温度应力，并用大型有限元软件ANSYS对温度场和应力场进行了模拟。

According to consideration of restriction and creep deform in mass concrete , the temperature field and thermal stress are simulated through the finite element program ANSYS .

处于复杂自然环境下的RC桥梁结构往往由于徐变考虑不足，引起下挠过大而影响使用乃至造成工程事故。

In complicated natural environment , the overlarge long-term deflection of reinforced concrete bridges structure due to the underestimation of creep may impact its usage effect .

结合一座PC连续刚构桥的徐变分析，对中国《公路钢筋混凝土及预应力混凝土桥涵设计规范》徐变系数的计算和应用进行分析探讨。

In association with structural creep analysis of a PC continuous frame bridge , several aspects on calculation and application of the creep coefficient introduced in China standard of highway PC bridge are analysed .

对ANSYS中的温度场及徐变应力计算进行了一定的研究，通过方法的改进，将其运用于丹江口大坝加高的研究。

And the calculation of temperature field and creep stress in ANSYS was studied , then the methods were improved on and were used in the study on heightening of Danjiangkou dam .

武广客运专线32m箱梁预应力效果监测及徐变上拱的控制措施

The 32 m span box girder prestressing effect monitoring and creep camber control for Wuhan-Guangzhou passenger express line

采用考虑等效龄期的混凝土弹性模量和抗拉强度CEB-FIP1990计算公式来表征早龄期时温度变化对其力学性能的影响，在应力分析中采用Bazant的双幂函数徐变模型。

The temperature field and thermal stress of concrete wall is calculated by the FEM at early age .

根据推导出的公式，用FORTRAN语言编制了结构徐变分析的位移法计算机程序，并对一个框架算例进行了徐变分析。

According to the formulas , a computer program of the displacement method to analyze creep effect was made in FORTRAN language . The creep effect of a frame was analyzed by using this program .

作者提供了累计温度和自重的徐变应力计算方法和程序，结合碾压混凝土（RCC）拱坝工程提供了施工期仿真应力特点。

The calculating method and program of creep-stresses for accumulated weight and temperature change are given . The specifications of actual simulation stresses of roller compacted concrete ( RCC ) arch dam during construction are also given .

结果表明：Midas计算结果与本文算法结果比较接近，推荐在后期徐变变形计算中采用Midas软件。

The results showed that the Midas results is much closer to the results of the paper algorithm than DB . Therefore Midas software is recommended in analyzing the post creep deformation .

首次根据线性徐变和迭加原理，采用ACI规范推荐的徐变和收缩计算公式，提出了钢筋混凝土轴压构件分批加载的变形计算简化方法。

Based on linear creep and superposition principle , adopting creep and shrinkage formula in ACI code , a new method to calculate displacement of axial-compress reinforced concrete member under multi-grade loading is first established .

通过分析研究，还得出不同粉煤灰掺量及配比的C50高性能混凝土徐变计算公式，可为实际工程中分析掺粉煤灰混凝土徐变性能提供帮助。

Based on the experimental results , a formula is developed to calculate the creep of C50 high performance concrete with different proportion of fly ash .

本文在变应力情况下用Burgers模型直接推导出混凝土弹性徐变本构方程，并证明这两种本构方程是等价的。

In the case of chang stress , by using the Burgers model this paper directly gets the constitutive equations of elasticity-creep of concrete and proves the constitutive equations to be equivalent to the above constitutive equations .

论文采用初应变法，推导出考虑混凝土加荷龄期的结构收缩徐变效应分析的有限元表达式，并用FORTRAN语言编写了计算机程序；

The initial strain method is adopted in the thesis to deduce the finite element expression of shrinkage and creep effects on the structure while taking the age of loading into account , and programme be written by FORTRAN language ;

同时还选用了目前广泛采用的多种收缩徐变模式进行了比较计算，认为BP-KX模式较适合于PC斜拉桥的时变分析。

Moreover , the BP-KX Model is opted from among different kinds of shrinkage and creep models in current use to be fitting in better with the time-dependent analysis for PC cable-stayed bridge .

并以正在研制开发的新一代桥梁集成CAD系统（BRCAD）为背景，简要介绍了徐变收缩分析方法在BRCAD系统中的实现。

Taking the development of the new generation of bridge integrated CAD system & BRCAD as the application background . This paper gives a brief introduction to the implementation .

混凝土的收缩、徐变在加载后90d内增长较大，在120d后趋于稳定。

The shrinkage and creep of the concrete increase considerably 90 d after the concrete has been loaded , and tend to be stable after 120 d.

用10cm×10cm×55cm等截面内埋拉杆型轴向拉伸试件，进行持续高拉应力下混凝土破坏规律的试验研究.内容包括：混凝土在高拉应力下的徐变变形及其特性；

By using 10 cm × 10 cm × 55 cm uniaxial tension specimens with buried tensile bars , the failure of concrete under sustained high tensile stress in investigated experimentally .

应用Trost-Bazant方法，建立了退化梁单元混凝土结构徐变分析计算方法。

Based on the Trost-Bazant method , the creep analysis procedure of concrete structures by the degenerated beam element is presented .

并采用ACI209R-92和CEB-FIP（MC90）两种徐变模型对各种短柱的徐变系数进行了计算。

Two creep models from ACI209R ( 92 ) and CEB-FIP ( MC90 ) were used to predict the time-dependent behavior of those concrete columns .

并将理论计算值与已知试验数据和Midas有限元软件仿真分析进行了对比，验证了作者提出的集中荷载作用下简支组合梁考虑混凝土徐变后剪切滑移计算的正确性。

And put forward to transfer surface shear slip equation under the concentrated load after consideration of concrete creep . Moreover Comparison of theoretical calculated values and the known experimental data , proved the correctness of the theory proposed by the author through the analysis of the Midas mold .

第一座大跨板拉桥是建成于1980年的瑞士Ganter桥。混凝土的徐变是混凝土桥梁结构设计计算中的一项重要内容。

The first long-span slab bridge in the world is the Ganter Bridge in Switzerland built in 1980.The concrete 's creep is an important part in concrete bridge 's structure design .

208m高的杨浦大桥主桥塔对混凝土收缩、徐变有着特定的要求，通过试验探索，确定了高性能、高泵程混凝土的配合比。

As for the 208m high tower of Yangpu Main bridge , certain requirements exist in concrete shrinkage and creepage . After a series of researches and tests , the mix ratio is determined for the high-performance concrete adapted to high pump lift .

本文对推算混凝土徐变收缩的BP-2模式作了简单介绍，提出了利用BP-2模式和逐步计算的有限单元法计算预应力混凝土结构长期内力和变形的方法以及CRSP计算机程序的简要说明，最后给出计算实例。

This paper introduces the BP-2 model for predicting creep and shrinkage of concrete , developed by Z. P. Bazant et al . A method for calculating long-term stresses and deformation of prestressed concrete structures and a brief guide of a computer program CRSP is provided .

钢-混凝土组合梁收缩徐变分析的有限元方法

Finite element analysis of creep and shrinkage of steel-concrete composite beams

高层建筑考虑施工过程徐变分析的实用方法

Practical Method for Creep Analysis Considering Construction Process in High-rise Building

预应力混凝土叠合构件的收缩徐变微差分析

Differential analysis of shrinkage and creep in composite prestressed concrete beams

混凝土徐变及其在桥梁预拱度设置中的应用

Creep of concrete and in bridge pre - crown establishment application

高压应力作用下混凝土的徐变和徐变破坏

Creep and creep rupture of concrete under high sustained compression stress